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/wp-includes/sodium_compat/src/ -> Compat.php (source)

   1  <?php
   2  
   3  /**
   4   * Libsodium compatibility layer
   5   *
   6   * This is the only class you should be interfacing with, as a user of
   7   * sodium_compat.
   8   *
   9   * If the PHP extension for libsodium is installed, it will always use that
  10   * instead of our implementations. You get better performance and stronger
  11   * guarantees against side-channels that way.
  12   *
  13   * However, if your users don't have the PHP extension installed, we offer a
  14   * compatible interface here. It will give you the correct results as if the
  15   * PHP extension was installed. It won't be as fast, of course.
  16   *
  17   * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION *
  18   *                                                                               *
  19   *     Until audited, this is probably not safe to use! DANGER WILL ROBINSON     *
  20   *                                                                               *
  21   * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION *
  22   */
  23  
  24  if (class_exists('ParagonIE_Sodium_Compat', false)) {
  25      return;
  26  }
  27  
  28  /**
  29   * @api
  30   */
  31  class ParagonIE_Sodium_Compat
  32  {
  33      /**
  34       * This parameter prevents the use of the PECL extension.
  35       * It should only be used for unit testing.
  36       *
  37       * @var bool
  38       */
  39      public static $disableFallbackForUnitTests = false;
  40  
  41      /**
  42       * Use fast multiplication rather than our constant-time multiplication
  43       * implementation. Can be enabled at runtime. Only enable this if you
  44       * are absolutely certain that there is no timing leak on your platform.
  45       *
  46       * @var bool
  47       */
  48      public static $fastMult = false;
  49  
  50      const LIBRARY_MAJOR_VERSION = 9;
  51      const LIBRARY_MINOR_VERSION = 1;
  52      const LIBRARY_VERSION_MAJOR = 9;
  53      const LIBRARY_VERSION_MINOR = 1;
  54      const VERSION_STRING = 'polyfill-1.0.8';
  55  
  56      // From libsodium
  57      const BASE64_VARIANT_ORIGINAL = 1;
  58      const BASE64_VARIANT_ORIGINAL_NO_PADDING = 3;
  59      const BASE64_VARIANT_URLSAFE = 5;
  60      const BASE64_VARIANT_URLSAFE_NO_PADDING = 7;
  61      const CRYPTO_AEAD_AES256GCM_KEYBYTES = 32;
  62      const CRYPTO_AEAD_AES256GCM_NSECBYTES = 0;
  63      const CRYPTO_AEAD_AES256GCM_NPUBBYTES = 12;
  64      const CRYPTO_AEAD_AES256GCM_ABYTES = 16;
  65      const CRYPTO_AEAD_AEGIS128L_KEYBYTES = 16;
  66      const CRYPTO_AEAD_AEGIS128L_NSECBYTES = 0;
  67      const CRYPTO_AEAD_AEGIS128L_NPUBBYTES = 16;
  68      const CRYPTO_AEAD_AEGIS128L_ABYTES = 32;
  69      const CRYPTO_AEAD_AEGIS256_KEYBYTES = 32;
  70      const CRYPTO_AEAD_AEGIS256_NSECBYTES = 0;
  71      const CRYPTO_AEAD_AEGIS256_NPUBBYTES = 32;
  72      const CRYPTO_AEAD_AEGIS256_ABYTES = 32;
  73      const CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES = 32;
  74      const CRYPTO_AEAD_CHACHA20POLY1305_NSECBYTES = 0;
  75      const CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES = 8;
  76      const CRYPTO_AEAD_CHACHA20POLY1305_ABYTES = 16;
  77      const CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES = 32;
  78      const CRYPTO_AEAD_CHACHA20POLY1305_IETF_NSECBYTES = 0;
  79      const CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES = 12;
  80      const CRYPTO_AEAD_CHACHA20POLY1305_IETF_ABYTES = 16;
  81      const CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES = 32;
  82      const CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NSECBYTES = 0;
  83      const CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES = 24;
  84      const CRYPTO_AEAD_XCHACHA20POLY1305_IETF_ABYTES = 16;
  85      const CRYPTO_AUTH_BYTES = 32;
  86      const CRYPTO_AUTH_KEYBYTES = 32;
  87      const CRYPTO_BOX_SEALBYTES = 16;
  88      const CRYPTO_BOX_SECRETKEYBYTES = 32;
  89      const CRYPTO_BOX_PUBLICKEYBYTES = 32;
  90      const CRYPTO_BOX_KEYPAIRBYTES = 64;
  91      const CRYPTO_BOX_MACBYTES = 16;
  92      const CRYPTO_BOX_NONCEBYTES = 24;
  93      const CRYPTO_BOX_SEEDBYTES = 32;
  94      const CRYPTO_CORE_RISTRETTO255_BYTES = 32;
  95      const CRYPTO_CORE_RISTRETTO255_SCALARBYTES = 32;
  96      const CRYPTO_CORE_RISTRETTO255_HASHBYTES = 64;
  97      const CRYPTO_CORE_RISTRETTO255_NONREDUCEDSCALARBYTES = 64;
  98      const CRYPTO_KDF_BYTES_MIN = 16;
  99      const CRYPTO_KDF_BYTES_MAX = 64;
 100      const CRYPTO_KDF_CONTEXTBYTES = 8;
 101      const CRYPTO_KDF_KEYBYTES = 32;
 102      const CRYPTO_KX_BYTES = 32;
 103      const CRYPTO_KX_PRIMITIVE = 'x25519blake2b';
 104      const CRYPTO_KX_SEEDBYTES = 32;
 105      const CRYPTO_KX_KEYPAIRBYTES = 64;
 106      const CRYPTO_KX_PUBLICKEYBYTES = 32;
 107      const CRYPTO_KX_SECRETKEYBYTES = 32;
 108      const CRYPTO_KX_SESSIONKEYBYTES = 32;
 109      const CRYPTO_GENERICHASH_BYTES = 32;
 110      const CRYPTO_GENERICHASH_BYTES_MIN = 16;
 111      const CRYPTO_GENERICHASH_BYTES_MAX = 64;
 112      const CRYPTO_GENERICHASH_KEYBYTES = 32;
 113      const CRYPTO_GENERICHASH_KEYBYTES_MIN = 16;
 114      const CRYPTO_GENERICHASH_KEYBYTES_MAX = 64;
 115      const CRYPTO_PWHASH_SALTBYTES = 16;
 116      const CRYPTO_PWHASH_STRPREFIX = '$argon2id$';
 117      const CRYPTO_PWHASH_ALG_ARGON2I13 = 1;
 118      const CRYPTO_PWHASH_ALG_ARGON2ID13 = 2;
 119      const CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE = 33554432;
 120      const CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE = 4;
 121      const CRYPTO_PWHASH_MEMLIMIT_MODERATE = 134217728;
 122      const CRYPTO_PWHASH_OPSLIMIT_MODERATE = 6;
 123      const CRYPTO_PWHASH_MEMLIMIT_SENSITIVE = 536870912;
 124      const CRYPTO_PWHASH_OPSLIMIT_SENSITIVE = 8;
 125      const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_SALTBYTES = 32;
 126      const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_STRPREFIX = '$7$';
 127      const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_INTERACTIVE = 534288;
 128      const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_INTERACTIVE = 16777216;
 129      const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_SENSITIVE = 33554432;
 130      const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_SENSITIVE = 1073741824;
 131      const CRYPTO_SCALARMULT_BYTES = 32;
 132      const CRYPTO_SCALARMULT_SCALARBYTES = 32;
 133      const CRYPTO_SCALARMULT_RISTRETTO255_BYTES = 32;
 134      const CRYPTO_SCALARMULT_RISTRETTO255_SCALARBYTES = 32;
 135      const CRYPTO_SHORTHASH_BYTES = 8;
 136      const CRYPTO_SHORTHASH_KEYBYTES = 16;
 137      const CRYPTO_SECRETBOX_KEYBYTES = 32;
 138      const CRYPTO_SECRETBOX_MACBYTES = 16;
 139      const CRYPTO_SECRETBOX_NONCEBYTES = 24;
 140      const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES = 17;
 141      const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES = 24;
 142      const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_KEYBYTES = 32;
 143      const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_PUSH = 0;
 144      const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_PULL = 1;
 145      const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_REKEY = 2;
 146      const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_FINAL = 3;
 147      const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_MESSAGEBYTES_MAX = 0x3fffffff80;
 148      const CRYPTO_SIGN_BYTES = 64;
 149      const CRYPTO_SIGN_SEEDBYTES = 32;
 150      const CRYPTO_SIGN_PUBLICKEYBYTES = 32;
 151      const CRYPTO_SIGN_SECRETKEYBYTES = 64;
 152      const CRYPTO_SIGN_KEYPAIRBYTES = 96;
 153      const CRYPTO_STREAM_KEYBYTES = 32;
 154      const CRYPTO_STREAM_NONCEBYTES = 24;
 155      const CRYPTO_STREAM_XCHACHA20_KEYBYTES = 32;
 156      const CRYPTO_STREAM_XCHACHA20_NONCEBYTES = 24;
 157  
 158      /**
 159       * Add two numbers (little-endian unsigned), storing the value in the first
 160       * parameter.
 161       *
 162       * This mutates $val.
 163       *
 164       * @param string $val
 165       * @param string $addv
 166       * @return void
 167       * @throws SodiumException
 168       */
 169      public static function add(
 170          #[\SensitiveParameter]
 171          &$val,
 172          #[\SensitiveParameter]
 173          $addv
 174      ) {
 175          $val_len = ParagonIE_Sodium_Core_Util::strlen($val);
 176          $addv_len = ParagonIE_Sodium_Core_Util::strlen($addv);
 177          if ($val_len !== $addv_len) {
 178              throw new SodiumException('values must have the same length');
 179          }
 180          $A = ParagonIE_Sodium_Core_Util::stringToIntArray($val);
 181          $B = ParagonIE_Sodium_Core_Util::stringToIntArray($addv);
 182  
 183          $c = 0;
 184          for ($i = 0; $i < $val_len; $i++) {
 185              $c += ($A[$i] + $B[$i]);
 186              $A[$i] = ($c & 0xff);
 187              $c >>= 8;
 188          }
 189          $val = ParagonIE_Sodium_Core_Util::intArrayToString($A);
 190      }
 191  
 192      /**
 193       * @param string $encoded
 194       * @param int $variant
 195       * @param string $ignore
 196       * @return string
 197       * @throws SodiumException
 198       */
 199      public static function base642bin(
 200          #[\SensitiveParameter]
 201          $encoded,
 202          $variant,
 203          $ignore = ''
 204      ) {
 205          /* Type checks: */
 206          ParagonIE_Sodium_Core_Util::declareScalarType($encoded, 'string', 1);
 207  
 208          /** @var string $encoded */
 209          $encoded = (string) $encoded;
 210  
 211          // Just strip before decoding
 212          if (!empty($ignore)) {
 213              $encoded = str_replace($ignore, '', $encoded);
 214          }
 215  
 216          try {
 217              switch ($variant) {
 218                  case self::BASE64_VARIANT_ORIGINAL:
 219                      return ParagonIE_Sodium_Core_Base64_Original::decode($encoded, true);
 220                  case self::BASE64_VARIANT_ORIGINAL_NO_PADDING:
 221                      return ParagonIE_Sodium_Core_Base64_Original::decodeNoPadding($encoded);
 222                  case self::BASE64_VARIANT_URLSAFE:
 223                      return ParagonIE_Sodium_Core_Base64_UrlSafe::decode($encoded, true);
 224                  case self::BASE64_VARIANT_URLSAFE_NO_PADDING:
 225                      return ParagonIE_Sodium_Core_Base64_UrlSafe::decodeNoPadding($encoded);
 226                  default:
 227                      throw new SodiumException('invalid base64 variant identifier');
 228              }
 229          } catch (Exception $ex) {
 230              if ($ex instanceof SodiumException) {
 231                  throw $ex;
 232              }
 233              throw new SodiumException('invalid base64 string', 0, $ex);
 234          }
 235      }
 236  
 237      /**
 238       * @param string $decoded
 239       * @param int $variant
 240       * @return string
 241       * @throws SodiumException
 242       */
 243      public static function bin2base64(
 244          #[\SensitiveParameter]
 245          $decoded,
 246          $variant
 247      ) {
 248          /* Type checks: */
 249          ParagonIE_Sodium_Core_Util::declareScalarType($decoded, 'string', 1);
 250          /** @var string $decoded */
 251          $decoded = (string) $decoded;
 252          if (ParagonIE_Sodium_Core_Util::strlen($decoded) === 0) {
 253              return '';
 254          }
 255  
 256          switch ($variant) {
 257              case self::BASE64_VARIANT_ORIGINAL:
 258                  return ParagonIE_Sodium_Core_Base64_Original::encode($decoded);
 259              case self::BASE64_VARIANT_ORIGINAL_NO_PADDING:
 260                  return ParagonIE_Sodium_Core_Base64_Original::encodeUnpadded($decoded);
 261              case self::BASE64_VARIANT_URLSAFE:
 262                  return ParagonIE_Sodium_Core_Base64_UrlSafe::encode($decoded);
 263              case self::BASE64_VARIANT_URLSAFE_NO_PADDING:
 264                  return ParagonIE_Sodium_Core_Base64_UrlSafe::encodeUnpadded($decoded);
 265              default:
 266                  throw new SodiumException('invalid base64 variant identifier');
 267          }
 268      }
 269  
 270      /**
 271       * Cache-timing-safe implementation of bin2hex().
 272       *
 273       * @param string $string A string (probably raw binary)
 274       * @return string        A hexadecimal-encoded string
 275       * @throws SodiumException
 276       * @throws TypeError
 277       * @psalm-suppress MixedArgument
 278       */
 279      public static function bin2hex(
 280          #[\SensitiveParameter]
 281          $string
 282      ) {
 283          /* Type checks: */
 284          ParagonIE_Sodium_Core_Util::declareScalarType($string, 'string', 1);
 285  
 286          if (self::useNewSodiumAPI()) {
 287              return (string) sodium_bin2hex($string);
 288          }
 289          if (self::use_fallback('bin2hex')) {
 290              return (string) call_user_func('\\Sodium\\bin2hex', $string);
 291          }
 292          return ParagonIE_Sodium_Core_Util::bin2hex($string);
 293      }
 294  
 295      /**
 296       * Compare two strings, in constant-time.
 297       * Compared to memcmp(), compare() is more useful for sorting.
 298       *
 299       * @param string $left  The left operand; must be a string
 300       * @param string $right The right operand; must be a string
 301       * @return int          If < 0 if the left operand is less than the right
 302       *                      If = 0 if both strings are equal
 303       *                      If > 0 if the right operand is less than the left
 304       * @throws SodiumException
 305       * @throws TypeError
 306       * @psalm-suppress MixedArgument
 307       */
 308      public static function compare(
 309          #[\SensitiveParameter]
 310          $left,
 311          #[\SensitiveParameter]
 312          $right
 313      ) {
 314          /* Type checks: */
 315          ParagonIE_Sodium_Core_Util::declareScalarType($left, 'string', 1);
 316          ParagonIE_Sodium_Core_Util::declareScalarType($right, 'string', 2);
 317  
 318          if (self::useNewSodiumAPI()) {
 319              return (int) sodium_compare($left, $right);
 320          }
 321          if (self::use_fallback('compare')) {
 322              return (int) call_user_func('\\Sodium\\compare', $left, $right);
 323          }
 324          return ParagonIE_Sodium_Core_Util::compare($left, $right);
 325      }
 326  
 327      /**
 328       * Authenticated Encryption with Associated Data: Decryption
 329       *
 330       * Algorithm:
 331       *     AEGIS-128L
 332       *
 333       * @param string $ciphertext Encrypted message (with MAC appended)
 334       * @param string $assocData  Authenticated Associated Data (unencrypted)
 335       * @param string $nonce      Number to be used only Once; must be 32 bytes
 336       * @param string $key        Encryption key
 337       *
 338       * @return string            The original plaintext message
 339       * @throws SodiumException
 340       * @throws TypeError
 341       * @psalm-suppress MixedArgument
 342       * @psalm-suppress MixedInferredReturnType
 343       * @psalm-suppress MixedReturnStatement
 344       */
 345      public static function crypto_aead_aegis128l_decrypt(
 346          $ciphertext = '',
 347          $assocData = '',
 348          $nonce = '',
 349          #[\SensitiveParameter]
 350          $key = ''
 351      ) {
 352          ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
 353          ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
 354          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
 355          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
 356  
 357          /* Input validation: */
 358          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AEGIS128L_NPUBBYTES) {
 359              throw new SodiumException('Nonce must be CRYPTO_AEAD_AEGIS128L_NPUBBYTES long');
 360          }
 361          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AEGIS128L_KEYBYTES) {
 362              throw new SodiumException('Key must be CRYPTO_AEAD_AEGIS128L_KEYBYTES long');
 363          }
 364          $ct_length = ParagonIE_Sodium_Core_Util::strlen($ciphertext);
 365          if ($ct_length < self::CRYPTO_AEAD_AEGIS128L_ABYTES) {
 366              throw new SodiumException('Message must be at least CRYPTO_AEAD_AEGIS128L_ABYTES long');
 367          }
 368  
 369          $ct = ParagonIE_Sodium_Core_Util::substr(
 370              $ciphertext,
 371              0,
 372              $ct_length - self::CRYPTO_AEAD_AEGIS128L_ABYTES
 373          );
 374          $tag = ParagonIE_Sodium_Core_Util::substr(
 375              $ciphertext,
 376              $ct_length - self::CRYPTO_AEAD_AEGIS128L_ABYTES,
 377              self::CRYPTO_AEAD_AEGIS128L_ABYTES
 378          );
 379          return ParagonIE_Sodium_Core_AEGIS128L::decrypt($ct, $tag, $assocData, $key, $nonce);
 380      }
 381  
 382      /**
 383       * Authenticated Encryption with Associated Data: Encryption
 384       *
 385       * Algorithm:
 386       *     AEGIS-128L
 387       *
 388       * @param string $plaintext Message to be encrypted
 389       * @param string $assocData Authenticated Associated Data (unencrypted)
 390       * @param string $nonce     Number to be used only Once; must be 32 bytes
 391       * @param string $key       Encryption key
 392       *
 393       * @return string           Ciphertext with 32-byte authentication tag appended
 394       * @throws SodiumException
 395       * @throws TypeError
 396       * @psalm-suppress MixedArgument
 397       */
 398      public static function crypto_aead_aegis128l_encrypt(
 399          #[\SensitiveParameter]
 400          $plaintext = '',
 401          $assocData = '',
 402          $nonce = '',
 403          #[\SensitiveParameter]
 404          $key = ''
 405      ) {
 406          ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
 407          ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
 408          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
 409          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
 410  
 411          /* Input validation: */
 412          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AEGIS128L_NPUBBYTES) {
 413              throw new SodiumException('Nonce must be CRYPTO_AEAD_AEGIS128L_NPUBBYTES long');
 414          }
 415          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AEGIS128L_KEYBYTES) {
 416              throw new SodiumException('Key must be CRYPTO_AEAD_AEGIS128L_KEYBYTES long');
 417          }
 418  
 419          list($ct, $tag) = ParagonIE_Sodium_Core_AEGIS128L::encrypt($plaintext, $assocData, $key, $nonce);
 420          return $ct . $tag;
 421      }
 422  
 423      /**
 424       * Return a secure random key for use with the AEGIS-128L
 425       * symmetric AEAD interface.
 426       *
 427       * @return string
 428       * @throws Exception
 429       * @throws Error
 430       */
 431      public static function crypto_aead_aegis128l_keygen()
 432      {
 433          return random_bytes(self::CRYPTO_AEAD_AEGIS128L_KEYBYTES);
 434      }
 435  
 436      /**
 437       * Authenticated Encryption with Associated Data: Decryption
 438       *
 439       * Algorithm:
 440       *     AEGIS-256
 441       *
 442       * @param string $ciphertext Encrypted message (with MAC appended)
 443       * @param string $assocData  Authenticated Associated Data (unencrypted)
 444       * @param string $nonce      Number to be used only Once; must be 32 bytes
 445       * @param string $key        Encryption key
 446       *
 447       * @return string            The original plaintext message
 448       * @throws SodiumException
 449       * @throws TypeError
 450       * @psalm-suppress MixedArgument
 451       * @psalm-suppress MixedInferredReturnType
 452       * @psalm-suppress MixedReturnStatement
 453       */
 454      public static function crypto_aead_aegis256_decrypt(
 455          $ciphertext = '',
 456          $assocData = '',
 457          $nonce = '',
 458          #[\SensitiveParameter]
 459          $key = ''
 460      ) {
 461          ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
 462          ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
 463          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
 464          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
 465  
 466          /* Input validation: */
 467          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AEGIS256_NPUBBYTES) {
 468              throw new SodiumException('Nonce must be CRYPTO_AEAD_AEGIS256_NPUBBYTES long');
 469          }
 470          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AEGIS256_KEYBYTES) {
 471              throw new SodiumException('Key must be CRYPTO_AEAD_AEGIS256_KEYBYTES long');
 472          }
 473          $ct_length = ParagonIE_Sodium_Core_Util::strlen($ciphertext);
 474          if ($ct_length < self::CRYPTO_AEAD_AEGIS256_ABYTES) {
 475              throw new SodiumException('Message must be at least CRYPTO_AEAD_AEGIS256_ABYTES long');
 476          }
 477  
 478          $ct = ParagonIE_Sodium_Core_Util::substr(
 479              $ciphertext,
 480              0,
 481              $ct_length - self::CRYPTO_AEAD_AEGIS256_ABYTES
 482          );
 483          $tag = ParagonIE_Sodium_Core_Util::substr(
 484              $ciphertext,
 485              $ct_length - self::CRYPTO_AEAD_AEGIS256_ABYTES,
 486              self::CRYPTO_AEAD_AEGIS256_ABYTES
 487          );
 488          return ParagonIE_Sodium_Core_AEGIS256::decrypt($ct, $tag, $assocData, $key, $nonce);
 489      }
 490  
 491      /**
 492       * Authenticated Encryption with Associated Data: Encryption
 493       *
 494       * Algorithm:
 495       *     AEGIS-256
 496       *
 497       * @param string $plaintext Message to be encrypted
 498       * @param string $assocData Authenticated Associated Data (unencrypted)
 499       * @param string $nonce Number to be used only Once; must be 32 bytes
 500       * @param string $key Encryption key
 501       *
 502       * @return string           Ciphertext with 32-byte authentication tag appended
 503       * @throws SodiumException
 504       * @throws TypeError
 505       * @psalm-suppress MixedArgument
 506       */
 507      public static function crypto_aead_aegis256_encrypt(
 508          #[\SensitiveParameter]
 509          $plaintext = '',
 510          $assocData = '',
 511          $nonce = '',
 512          #[\SensitiveParameter]
 513          $key = ''
 514      ) {
 515          ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
 516          ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
 517          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
 518          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
 519  
 520          /* Input validation: */
 521          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AEGIS256_NPUBBYTES) {
 522              throw new SodiumException('Nonce must be CRYPTO_AEAD_AEGIS256_NPUBBYTES long');
 523          }
 524          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AEGIS256_KEYBYTES) {
 525              throw new SodiumException('Key must be CRYPTO_AEAD_AEGIS256_KEYBYTES long');
 526          }
 527  
 528          list($ct, $tag) = ParagonIE_Sodium_Core_AEGIS256::encrypt($plaintext, $assocData, $key, $nonce);
 529          return $ct . $tag;
 530      }
 531  
 532      /**
 533       * Return a secure random key for use with the AEGIS-256
 534       * symmetric AEAD interface.
 535       *
 536       * @return string
 537       * @throws Exception
 538       * @throws Error
 539       */
 540      public static function crypto_aead_aegis256_keygen()
 541      {
 542          return random_bytes(self::CRYPTO_AEAD_AEGIS256_KEYBYTES);
 543      }
 544  
 545      /**
 546       * Is AES-256-GCM even available to use?
 547       *
 548       * @return bool
 549       * @psalm-suppress UndefinedFunction
 550       * @psalm-suppress MixedInferredReturnType
 551       * @psalm-suppress MixedReturnStatement
 552       */
 553      public static function crypto_aead_aes256gcm_is_available()
 554      {
 555          if (self::useNewSodiumAPI()) {
 556              return sodium_crypto_aead_aes256gcm_is_available();
 557          }
 558          if (self::use_fallback('crypto_aead_aes256gcm_is_available')) {
 559              return call_user_func('\\Sodium\\crypto_aead_aes256gcm_is_available');
 560          }
 561          if (PHP_VERSION_ID < 70100) {
 562              // OpenSSL doesn't support AEAD before 7.1.0
 563              return false;
 564          }
 565          if (!extension_loaded('openssl')) {
 566              return false;
 567          }
 568          if (!is_callable('openssl_encrypt') || !is_callable('openssl_decrypt')) {
 569              // OpenSSL isn't installed
 570              return false;
 571          }
 572          return (bool) in_array('aes-256-gcm', openssl_get_cipher_methods());
 573      }
 574  
 575      /**
 576       * Authenticated Encryption with Associated Data: Decryption
 577       *
 578       * Algorithm:
 579       *     AES-256-GCM
 580       *
 581       * This mode uses a 64-bit random nonce with a 64-bit counter.
 582       * IETF mode uses a 96-bit random nonce with a 32-bit counter.
 583       *
 584       * @param string $ciphertext Encrypted message (with Poly1305 MAC appended)
 585       * @param string $assocData  Authenticated Associated Data (unencrypted)
 586       * @param string $nonce      Number to be used only Once; must be 8 bytes
 587       * @param string $key        Encryption key
 588       *
 589       * @return string|bool       The original plaintext message
 590       * @throws SodiumException
 591       * @throws TypeError
 592       * @psalm-suppress MixedArgument
 593       * @psalm-suppress MixedInferredReturnType
 594       * @psalm-suppress MixedReturnStatement
 595       */
 596      public static function crypto_aead_aes256gcm_decrypt(
 597          $ciphertext = '',
 598          $assocData = '',
 599          $nonce = '',
 600          #[\SensitiveParameter]
 601          $key = ''
 602      ) {
 603          if (!self::crypto_aead_aes256gcm_is_available()) {
 604              throw new SodiumException('AES-256-GCM is not available');
 605          }
 606          ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
 607          ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
 608          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
 609          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
 610  
 611          /* Input validation: */
 612          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AES256GCM_NPUBBYTES) {
 613              throw new SodiumException('Nonce must be CRYPTO_AEAD_AES256GCM_NPUBBYTES long');
 614          }
 615          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AES256GCM_KEYBYTES) {
 616              throw new SodiumException('Key must be CRYPTO_AEAD_AES256GCM_KEYBYTES long');
 617          }
 618          if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) < self::CRYPTO_AEAD_AES256GCM_ABYTES) {
 619              throw new SodiumException('Message must be at least CRYPTO_AEAD_AES256GCM_ABYTES long');
 620          }
 621          if (!extension_loaded('openssl')) {
 622              throw new SodiumException('The OpenSSL extension is not installed');
 623          }
 624          if (!is_callable('openssl_decrypt')) {
 625              throw new SodiumException('The OpenSSL extension is not installed, or openssl_decrypt() is not available');
 626          }
 627  
 628          /** @var string $ctext */
 629          $ctext = ParagonIE_Sodium_Core_Util::substr($ciphertext, 0, -self::CRYPTO_AEAD_AES256GCM_ABYTES);
 630          /** @var string $authTag */
 631          $authTag = ParagonIE_Sodium_Core_Util::substr($ciphertext, -self::CRYPTO_AEAD_AES256GCM_ABYTES, 16);
 632          return openssl_decrypt(
 633              $ctext,
 634              'aes-256-gcm',
 635              $key,
 636              OPENSSL_RAW_DATA,
 637              $nonce,
 638              $authTag,
 639              $assocData
 640          );
 641      }
 642  
 643      /**
 644       * Authenticated Encryption with Associated Data: Encryption
 645       *
 646       * Algorithm:
 647       *     AES-256-GCM
 648       *
 649       * @param string $plaintext Message to be encrypted
 650       * @param string $assocData Authenticated Associated Data (unencrypted)
 651       * @param string $nonce     Number to be used only Once; must be 8 bytes
 652       * @param string $key       Encryption key
 653       *
 654       * @return string           Ciphertext with a 16-byte GCM message
 655       *                          authentication code appended
 656       * @throws SodiumException
 657       * @throws TypeError
 658       * @psalm-suppress MixedArgument
 659       */
 660      public static function crypto_aead_aes256gcm_encrypt(
 661          #[\SensitiveParameter]
 662          $plaintext = '',
 663          $assocData = '',
 664          $nonce = '',
 665          #[\SensitiveParameter]
 666          $key = ''
 667      ) {
 668          if (!self::crypto_aead_aes256gcm_is_available()) {
 669              throw new SodiumException('AES-256-GCM is not available');
 670          }
 671          ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
 672          ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
 673          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
 674          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
 675  
 676          /* Input validation: */
 677          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AES256GCM_NPUBBYTES) {
 678              throw new SodiumException('Nonce must be CRYPTO_AEAD_AES256GCM_NPUBBYTES long');
 679          }
 680          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AES256GCM_KEYBYTES) {
 681              throw new SodiumException('Key must be CRYPTO_AEAD_AES256GCM_KEYBYTES long');
 682          }
 683  
 684          if (!extension_loaded('openssl')) {
 685              throw new SodiumException('The OpenSSL extension is not installed');
 686          }
 687          if (!is_callable('openssl_encrypt')) {
 688              throw new SodiumException('The OpenSSL extension is not installed, or openssl_encrypt() is not available');
 689          }
 690  
 691          $authTag = '';
 692          $ciphertext = openssl_encrypt(
 693              $plaintext,
 694              'aes-256-gcm',
 695              $key,
 696              OPENSSL_RAW_DATA,
 697              $nonce,
 698              $authTag,
 699              $assocData
 700          );
 701          return $ciphertext . $authTag;
 702      }
 703  
 704      /**
 705       * Return a secure random key for use with the AES-256-GCM
 706       * symmetric AEAD interface.
 707       *
 708       * @return string
 709       * @throws Exception
 710       * @throws Error
 711       */
 712      public static function crypto_aead_aes256gcm_keygen()
 713      {
 714          return random_bytes(self::CRYPTO_AEAD_AES256GCM_KEYBYTES);
 715      }
 716  
 717      /**
 718       * Authenticated Encryption with Associated Data: Decryption
 719       *
 720       * Algorithm:
 721       *     ChaCha20-Poly1305
 722       *
 723       * This mode uses a 64-bit random nonce with a 64-bit counter.
 724       * IETF mode uses a 96-bit random nonce with a 32-bit counter.
 725       *
 726       * @param string $ciphertext Encrypted message (with Poly1305 MAC appended)
 727       * @param string $assocData  Authenticated Associated Data (unencrypted)
 728       * @param string $nonce      Number to be used only Once; must be 8 bytes
 729       * @param string $key        Encryption key
 730       *
 731       * @return string            The original plaintext message
 732       * @throws SodiumException
 733       * @throws TypeError
 734       * @psalm-suppress MixedArgument
 735       * @psalm-suppress MixedInferredReturnType
 736       * @psalm-suppress MixedReturnStatement
 737       */
 738      public static function crypto_aead_chacha20poly1305_decrypt(
 739          $ciphertext = '',
 740          $assocData = '',
 741          $nonce = '',
 742          #[\SensitiveParameter]
 743          $key = ''
 744      ) {
 745          /* Type checks: */
 746          ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
 747          ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
 748          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
 749          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
 750  
 751          /* Input validation: */
 752          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES) {
 753              throw new SodiumException('Nonce must be CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES long');
 754          }
 755          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES) {
 756              throw new SodiumException('Key must be CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES long');
 757          }
 758          if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) < self::CRYPTO_AEAD_CHACHA20POLY1305_ABYTES) {
 759              throw new SodiumException('Message must be at least CRYPTO_AEAD_CHACHA20POLY1305_ABYTES long');
 760          }
 761  
 762          if (self::useNewSodiumAPI()) {
 763              /**
 764               * @psalm-suppress InvalidReturnStatement
 765               * @psalm-suppress FalsableReturnStatement
 766               */
 767              return sodium_crypto_aead_chacha20poly1305_decrypt(
 768                  $ciphertext,
 769                  $assocData,
 770                  $nonce,
 771                  $key
 772              );
 773          }
 774          if (self::use_fallback('crypto_aead_chacha20poly1305_decrypt')) {
 775              return call_user_func(
 776                  '\\Sodium\\crypto_aead_chacha20poly1305_decrypt',
 777                  $ciphertext,
 778                  $assocData,
 779                  $nonce,
 780                  $key
 781              );
 782          }
 783          if (PHP_INT_SIZE === 4) {
 784              return ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_decrypt(
 785                  $ciphertext,
 786                  $assocData,
 787                  $nonce,
 788                  $key
 789              );
 790          }
 791          return ParagonIE_Sodium_Crypto::aead_chacha20poly1305_decrypt(
 792              $ciphertext,
 793              $assocData,
 794              $nonce,
 795              $key
 796          );
 797      }
 798  
 799      /**
 800       * Authenticated Encryption with Associated Data
 801       *
 802       * Algorithm:
 803       *     ChaCha20-Poly1305
 804       *
 805       * This mode uses a 64-bit random nonce with a 64-bit counter.
 806       * IETF mode uses a 96-bit random nonce with a 32-bit counter.
 807       *
 808       * @param string $plaintext Message to be encrypted
 809       * @param string $assocData Authenticated Associated Data (unencrypted)
 810       * @param string $nonce     Number to be used only Once; must be 8 bytes
 811       * @param string $key       Encryption key
 812       *
 813       * @return string           Ciphertext with a 16-byte Poly1305 message
 814       *                          authentication code appended
 815       * @throws SodiumException
 816       * @throws TypeError
 817       * @psalm-suppress MixedArgument
 818       */
 819      public static function crypto_aead_chacha20poly1305_encrypt(
 820          #[\SensitiveParameter]
 821          $plaintext = '',
 822          $assocData = '',
 823          $nonce = '',
 824          #[\SensitiveParameter]
 825          $key = ''
 826      ) {
 827          /* Type checks: */
 828          ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
 829          ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
 830          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
 831          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
 832  
 833          /* Input validation: */
 834          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES) {
 835              throw new SodiumException('Nonce must be CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES long');
 836          }
 837          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES) {
 838              throw new SodiumException('Key must be CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES long');
 839          }
 840  
 841          if (self::useNewSodiumAPI()) {
 842              return (string) sodium_crypto_aead_chacha20poly1305_encrypt(
 843                  $plaintext,
 844                  $assocData,
 845                  $nonce,
 846                  $key
 847              );
 848          }
 849          if (self::use_fallback('crypto_aead_chacha20poly1305_encrypt')) {
 850              return (string) call_user_func(
 851                  '\\Sodium\\crypto_aead_chacha20poly1305_encrypt',
 852                  $plaintext,
 853                  $assocData,
 854                  $nonce,
 855                  $key
 856              );
 857          }
 858          if (PHP_INT_SIZE === 4) {
 859              return ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_encrypt(
 860                  $plaintext,
 861                  $assocData,
 862                  $nonce,
 863                  $key
 864              );
 865          }
 866          return ParagonIE_Sodium_Crypto::aead_chacha20poly1305_encrypt(
 867              $plaintext,
 868              $assocData,
 869              $nonce,
 870              $key
 871          );
 872      }
 873  
 874      /**
 875       * Authenticated Encryption with Associated Data: Decryption
 876       *
 877       * Algorithm:
 878       *     ChaCha20-Poly1305
 879       *
 880       * IETF mode uses a 96-bit random nonce with a 32-bit counter.
 881       * Regular mode uses a 64-bit random nonce with a 64-bit counter.
 882       *
 883       * @param string $ciphertext Encrypted message (with Poly1305 MAC appended)
 884       * @param string $assocData  Authenticated Associated Data (unencrypted)
 885       * @param string $nonce      Number to be used only Once; must be 12 bytes
 886       * @param string $key        Encryption key
 887       *
 888       * @return string            The original plaintext message
 889       * @throws SodiumException
 890       * @throws TypeError
 891       * @psalm-suppress MixedArgument
 892       * @psalm-suppress MixedInferredReturnType
 893       * @psalm-suppress MixedReturnStatement
 894       */
 895      public static function crypto_aead_chacha20poly1305_ietf_decrypt(
 896          $ciphertext = '',
 897          $assocData = '',
 898          $nonce = '',
 899          #[\SensitiveParameter]
 900          $key = ''
 901      ) {
 902          /* Type checks: */
 903          ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
 904          ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
 905          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
 906          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
 907  
 908          /* Input validation: */
 909          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES) {
 910              throw new SodiumException('Nonce must be CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES long');
 911          }
 912          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES) {
 913              throw new SodiumException('Key must be CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES long');
 914          }
 915          if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) < self::CRYPTO_AEAD_CHACHA20POLY1305_ABYTES) {
 916              throw new SodiumException('Message must be at least CRYPTO_AEAD_CHACHA20POLY1305_IETF_ABYTES long');
 917          }
 918  
 919          if (self::useNewSodiumAPI()) {
 920              /**
 921               * @psalm-suppress InvalidReturnStatement
 922               * @psalm-suppress FalsableReturnStatement
 923               */
 924              return sodium_crypto_aead_chacha20poly1305_ietf_decrypt(
 925                  $ciphertext,
 926                  $assocData,
 927                  $nonce,
 928                  $key
 929              );
 930          }
 931          if (self::use_fallback('crypto_aead_chacha20poly1305_ietf_decrypt')) {
 932              return call_user_func(
 933                  '\\Sodium\\crypto_aead_chacha20poly1305_ietf_decrypt',
 934                  $ciphertext,
 935                  $assocData,
 936                  $nonce,
 937                  $key
 938              );
 939          }
 940          if (PHP_INT_SIZE === 4) {
 941              return ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_ietf_decrypt(
 942                  $ciphertext,
 943                  $assocData,
 944                  $nonce,
 945                  $key
 946              );
 947          }
 948          return ParagonIE_Sodium_Crypto::aead_chacha20poly1305_ietf_decrypt(
 949              $ciphertext,
 950              $assocData,
 951              $nonce,
 952              $key
 953          );
 954      }
 955  
 956      /**
 957       * Return a secure random key for use with the ChaCha20-Poly1305
 958       * symmetric AEAD interface.
 959       *
 960       * @return string
 961       * @throws Exception
 962       * @throws Error
 963       */
 964      public static function crypto_aead_chacha20poly1305_keygen()
 965      {
 966          return random_bytes(self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES);
 967      }
 968  
 969      /**
 970       * Authenticated Encryption with Associated Data
 971       *
 972       * Algorithm:
 973       *     ChaCha20-Poly1305
 974       *
 975       * IETF mode uses a 96-bit random nonce with a 32-bit counter.
 976       * Regular mode uses a 64-bit random nonce with a 64-bit counter.
 977       *
 978       * @param string $plaintext Message to be encrypted
 979       * @param string $assocData Authenticated Associated Data (unencrypted)
 980       * @param string $nonce Number to be used only Once; must be 8 bytes
 981       * @param string $key Encryption key
 982       *
 983       * @return string           Ciphertext with a 16-byte Poly1305 message
 984       *                          authentication code appended
 985       * @throws SodiumException
 986       * @throws TypeError
 987       * @psalm-suppress MixedArgument
 988       */
 989      public static function crypto_aead_chacha20poly1305_ietf_encrypt(
 990          #[\SensitiveParameter]
 991          $plaintext = '',
 992          $assocData = '',
 993          $nonce = '',
 994          #[\SensitiveParameter]
 995          $key = ''
 996      ) {
 997          /* Type checks: */
 998          ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
 999          if (!is_null($assocData)) {
1000              ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
1001          }
1002          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
1003          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
1004  
1005          /* Input validation: */
1006          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES) {
1007              throw new SodiumException('Nonce must be CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES long');
1008          }
1009          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES) {
1010              throw new SodiumException('Key must be CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES long');
1011          }
1012  
1013          if (self::useNewSodiumAPI()) {
1014              return (string) sodium_crypto_aead_chacha20poly1305_ietf_encrypt(
1015                  $plaintext,
1016                  $assocData,
1017                  $nonce,
1018                  $key
1019              );
1020          }
1021          if (self::use_fallback('crypto_aead_chacha20poly1305_ietf_encrypt')) {
1022              return (string) call_user_func(
1023                  '\\Sodium\\crypto_aead_chacha20poly1305_ietf_encrypt',
1024                  $plaintext,
1025                  $assocData,
1026                  $nonce,
1027                  $key
1028              );
1029          }
1030          if (PHP_INT_SIZE === 4) {
1031              return ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_ietf_encrypt(
1032                  $plaintext,
1033                  $assocData,
1034                  $nonce,
1035                  $key
1036              );
1037          }
1038          return ParagonIE_Sodium_Crypto::aead_chacha20poly1305_ietf_encrypt(
1039              $plaintext,
1040              $assocData,
1041              $nonce,
1042              $key
1043          );
1044      }
1045  
1046      /**
1047       * Return a secure random key for use with the ChaCha20-Poly1305
1048       * symmetric AEAD interface. (IETF version)
1049       *
1050       * @return string
1051       * @throws Exception
1052       * @throws Error
1053       */
1054      public static function crypto_aead_chacha20poly1305_ietf_keygen()
1055      {
1056          return random_bytes(self::CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES);
1057      }
1058  
1059      /**
1060       * Authenticated Encryption with Associated Data: Decryption
1061       *
1062       * Algorithm:
1063       *     XChaCha20-Poly1305
1064       *
1065       * This mode uses a 64-bit random nonce with a 64-bit counter.
1066       * IETF mode uses a 96-bit random nonce with a 32-bit counter.
1067       *
1068       * @param string $ciphertext   Encrypted message (with Poly1305 MAC appended)
1069       * @param string $assocData    Authenticated Associated Data (unencrypted)
1070       * @param string $nonce        Number to be used only Once; must be 8 bytes
1071       * @param string $key          Encryption key
1072       * @param bool   $dontFallback Don't fallback to ext/sodium
1073       *
1074       * @return string|bool         The original plaintext message
1075       * @throws SodiumException
1076       * @throws TypeError
1077       * @psalm-suppress MixedArgument
1078       */
1079      public static function crypto_aead_xchacha20poly1305_ietf_decrypt(
1080          $ciphertext = '',
1081          $assocData = '',
1082          $nonce = '',
1083          #[\SensitiveParameter]
1084          $key = '',
1085          $dontFallback = false
1086      ) {
1087          /* Type checks: */
1088          ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
1089          if (!is_null($assocData)) {
1090              ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
1091          } else {
1092              $assocData = '';
1093          }
1094          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
1095          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
1096  
1097          /* Input validation: */
1098          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES) {
1099              throw new SodiumException('Nonce must be CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES long');
1100          }
1101          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES) {
1102              throw new SodiumException('Key must be CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES long');
1103          }
1104          if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) < self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_ABYTES) {
1105              throw new SodiumException('Message must be at least CRYPTO_AEAD_XCHACHA20POLY1305_IETF_ABYTES long');
1106          }
1107          if (self::useNewSodiumAPI() && !$dontFallback) {
1108              if (is_callable('sodium_crypto_aead_xchacha20poly1305_ietf_decrypt')) {
1109                  return sodium_crypto_aead_xchacha20poly1305_ietf_decrypt(
1110                      $ciphertext,
1111                      $assocData,
1112                      $nonce,
1113                      $key
1114                  );
1115              }
1116          }
1117  
1118          if (PHP_INT_SIZE === 4) {
1119              return ParagonIE_Sodium_Crypto32::aead_xchacha20poly1305_ietf_decrypt(
1120                  $ciphertext,
1121                  $assocData,
1122                  $nonce,
1123                  $key
1124              );
1125          }
1126          return ParagonIE_Sodium_Crypto::aead_xchacha20poly1305_ietf_decrypt(
1127              $ciphertext,
1128              $assocData,
1129              $nonce,
1130              $key
1131          );
1132      }
1133  
1134      /**
1135       * Authenticated Encryption with Associated Data
1136       *
1137       * Algorithm:
1138       *     XChaCha20-Poly1305
1139       *
1140       * This mode uses a 64-bit random nonce with a 64-bit counter.
1141       * IETF mode uses a 96-bit random nonce with a 32-bit counter.
1142       *
1143       * @param string $plaintext    Message to be encrypted
1144       * @param string $assocData    Authenticated Associated Data (unencrypted)
1145       * @param string $nonce        Number to be used only Once; must be 8 bytes
1146       * @param string $key          Encryption key
1147       * @param bool   $dontFallback Don't fallback to ext/sodium
1148       *
1149       * @return string           Ciphertext with a 16-byte Poly1305 message
1150       *                          authentication code appended
1151       * @throws SodiumException
1152       * @throws TypeError
1153       * @psalm-suppress MixedArgument
1154       */
1155      public static function crypto_aead_xchacha20poly1305_ietf_encrypt(
1156          #[\SensitiveParameter]
1157          $plaintext = '',
1158          $assocData = '',
1159          $nonce = '',
1160          #[\SensitiveParameter]
1161          $key = '',
1162          $dontFallback = false
1163      ) {
1164          /* Type checks: */
1165          ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
1166          if (!is_null($assocData)) {
1167              ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
1168          } else {
1169              $assocData = '';
1170          }
1171          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
1172          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
1173  
1174          /* Input validation: */
1175          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES) {
1176              throw new SodiumException('Nonce must be CRYPTO_AEAD_XCHACHA20POLY1305_NPUBBYTES long');
1177          }
1178          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES) {
1179              throw new SodiumException('Key must be CRYPTO_AEAD_XCHACHA20POLY1305_KEYBYTES long');
1180          }
1181          if (self::useNewSodiumAPI() && !$dontFallback) {
1182              if (is_callable('sodium_crypto_aead_xchacha20poly1305_ietf_encrypt')) {
1183                  return sodium_crypto_aead_xchacha20poly1305_ietf_encrypt(
1184                      $plaintext,
1185                      $assocData,
1186                      $nonce,
1187                      $key
1188                  );
1189              }
1190          }
1191  
1192          if (PHP_INT_SIZE === 4) {
1193              return ParagonIE_Sodium_Crypto32::aead_xchacha20poly1305_ietf_encrypt(
1194                  $plaintext,
1195                  $assocData,
1196                  $nonce,
1197                  $key
1198              );
1199          }
1200          return ParagonIE_Sodium_Crypto::aead_xchacha20poly1305_ietf_encrypt(
1201              $plaintext,
1202              $assocData,
1203              $nonce,
1204              $key
1205          );
1206      }
1207  
1208      /**
1209       * Return a secure random key for use with the XChaCha20-Poly1305
1210       * symmetric AEAD interface.
1211       *
1212       * @return string
1213       * @throws Exception
1214       * @throws Error
1215       */
1216      public static function crypto_aead_xchacha20poly1305_ietf_keygen()
1217      {
1218          return random_bytes(self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES);
1219      }
1220  
1221      /**
1222       * Authenticate a message. Uses symmetric-key cryptography.
1223       *
1224       * Algorithm:
1225       *     HMAC-SHA512-256. Which is HMAC-SHA-512 truncated to 256 bits.
1226       *     Not to be confused with HMAC-SHA-512/256 which would use the
1227       *     SHA-512/256 hash function (uses different initial parameters
1228       *     but still truncates to 256 bits to sidestep length-extension
1229       *     attacks).
1230       *
1231       * @param string $message Message to be authenticated
1232       * @param string $key Symmetric authentication key
1233       * @return string         Message authentication code
1234       * @throws SodiumException
1235       * @throws TypeError
1236       * @psalm-suppress MixedArgument
1237       */
1238      public static function crypto_auth(
1239          $message,
1240          #[\SensitiveParameter]
1241          $key
1242      ) {
1243          /* Type checks: */
1244          ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
1245          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 2);
1246  
1247          /* Input validation: */
1248          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AUTH_KEYBYTES) {
1249              throw new SodiumException('Argument 2 must be CRYPTO_AUTH_KEYBYTES long.');
1250          }
1251  
1252          if (self::useNewSodiumAPI()) {
1253              return (string) sodium_crypto_auth($message, $key);
1254          }
1255          if (self::use_fallback('crypto_auth')) {
1256              return (string) call_user_func('\\Sodium\\crypto_auth', $message, $key);
1257          }
1258          if (PHP_INT_SIZE === 4) {
1259              return ParagonIE_Sodium_Crypto32::auth($message, $key);
1260          }
1261          return ParagonIE_Sodium_Crypto::auth($message, $key);
1262      }
1263  
1264      /**
1265       * @return string
1266       * @throws Exception
1267       * @throws Error
1268       */
1269      public static function crypto_auth_keygen()
1270      {
1271          return random_bytes(self::CRYPTO_AUTH_KEYBYTES);
1272      }
1273  
1274      /**
1275       * Verify the MAC of a message previously authenticated with crypto_auth.
1276       *
1277       * @param string $mac Message authentication code
1278       * @param string $message Message whose authenticity you are attempting to
1279       *                        verify (with a given MAC and key)
1280       * @param string $key Symmetric authentication key
1281       * @return bool           TRUE if authenticated, FALSE otherwise
1282       * @throws SodiumException
1283       * @throws TypeError
1284       * @psalm-suppress MixedArgument
1285       */
1286      public static function crypto_auth_verify(
1287          $mac,
1288          $message,
1289          #[\SensitiveParameter]
1290          $key
1291      ) {
1292          /* Type checks: */
1293          ParagonIE_Sodium_Core_Util::declareScalarType($mac, 'string', 1);
1294          ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 2);
1295          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
1296  
1297          /* Input validation: */
1298          if (ParagonIE_Sodium_Core_Util::strlen($mac) !== self::CRYPTO_AUTH_BYTES) {
1299              throw new SodiumException('Argument 1 must be CRYPTO_AUTH_BYTES long.');
1300          }
1301          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AUTH_KEYBYTES) {
1302              throw new SodiumException('Argument 3 must be CRYPTO_AUTH_KEYBYTES long.');
1303          }
1304  
1305          if (self::useNewSodiumAPI()) {
1306              return (bool) sodium_crypto_auth_verify($mac, $message, $key);
1307          }
1308          if (self::use_fallback('crypto_auth_verify')) {
1309              return (bool) call_user_func('\\Sodium\\crypto_auth_verify', $mac, $message, $key);
1310          }
1311          if (PHP_INT_SIZE === 4) {
1312              return ParagonIE_Sodium_Crypto32::auth_verify($mac, $message, $key);
1313          }
1314          return ParagonIE_Sodium_Crypto::auth_verify($mac, $message, $key);
1315      }
1316  
1317      /**
1318       * Authenticated asymmetric-key encryption. Both the sender and recipient
1319       * may decrypt messages.
1320       *
1321       * Algorithm: X25519-XSalsa20-Poly1305.
1322       *     X25519: Elliptic-Curve Diffie Hellman over Curve25519.
1323       *     XSalsa20: Extended-nonce variant of salsa20.
1324       *     Poyl1305: Polynomial MAC for one-time message authentication.
1325       *
1326       * @param string $plaintext The message to be encrypted
1327       * @param string $nonce A Number to only be used Once; must be 24 bytes
1328       * @param string $keypair Your secret key and your recipient's public key
1329       * @return string           Ciphertext with 16-byte Poly1305 MAC
1330       * @throws SodiumException
1331       * @throws TypeError
1332       * @psalm-suppress MixedArgument
1333       */
1334      public static function crypto_box(
1335          $plaintext,
1336          $nonce,
1337          #[\SensitiveParameter]
1338          $keypair
1339      ) {
1340          /* Type checks: */
1341          ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
1342          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
1343          ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 3);
1344  
1345          /* Input validation: */
1346          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_BOX_NONCEBYTES) {
1347              throw new SodiumException('Argument 2 must be CRYPTO_BOX_NONCEBYTES long.');
1348          }
1349          if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
1350              throw new SodiumException('Argument 3 must be CRYPTO_BOX_KEYPAIRBYTES long.');
1351          }
1352  
1353          if (self::useNewSodiumAPI()) {
1354              return (string) sodium_crypto_box($plaintext, $nonce, $keypair);
1355          }
1356          if (self::use_fallback('crypto_box')) {
1357              return (string) call_user_func('\\Sodium\\crypto_box', $plaintext, $nonce, $keypair);
1358          }
1359          if (PHP_INT_SIZE === 4) {
1360              return ParagonIE_Sodium_Crypto32::box($plaintext, $nonce, $keypair);
1361          }
1362          return ParagonIE_Sodium_Crypto::box($plaintext, $nonce, $keypair);
1363      }
1364  
1365      /**
1366       * Anonymous public-key encryption. Only the recipient may decrypt messages.
1367       *
1368       * Algorithm: X25519-XSalsa20-Poly1305, as with crypto_box.
1369       *     The sender's X25519 keypair is ephemeral.
1370       *     Nonce is generated from the BLAKE2b hash of both public keys.
1371       *
1372       * This provides ciphertext integrity.
1373       *
1374       * @param string $plaintext Message to be sealed
1375       * @param string $publicKey Your recipient's public key
1376       * @return string           Sealed message that only your recipient can
1377       *                          decrypt
1378       * @throws SodiumException
1379       * @throws TypeError
1380       * @psalm-suppress MixedArgument
1381       */
1382      public static function crypto_box_seal(
1383          #[\SensitiveParameter]
1384          $plaintext,
1385          $publicKey
1386      ) {
1387          /* Type checks: */
1388          ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
1389          ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, 'string', 2);
1390  
1391          /* Input validation: */
1392          if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
1393              throw new SodiumException('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
1394          }
1395  
1396          if (self::useNewSodiumAPI()) {
1397              return (string) sodium_crypto_box_seal($plaintext, $publicKey);
1398          }
1399          if (self::use_fallback('crypto_box_seal')) {
1400              return (string) call_user_func('\\Sodium\\crypto_box_seal', $plaintext, $publicKey);
1401          }
1402          if (PHP_INT_SIZE === 4) {
1403              return ParagonIE_Sodium_Crypto32::box_seal($plaintext, $publicKey);
1404          }
1405          return ParagonIE_Sodium_Crypto::box_seal($plaintext, $publicKey);
1406      }
1407  
1408      /**
1409       * Opens a message encrypted with crypto_box_seal(). Requires
1410       * the recipient's keypair (sk || pk) to decrypt successfully.
1411       *
1412       * This validates ciphertext integrity.
1413       *
1414       * @param string $ciphertext Sealed message to be opened
1415       * @param string $keypair    Your crypto_box keypair
1416       * @return string            The original plaintext message
1417       * @throws SodiumException
1418       * @throws TypeError
1419       * @psalm-suppress MixedArgument
1420       * @psalm-suppress MixedInferredReturnType
1421       * @psalm-suppress MixedReturnStatement
1422       */
1423      public static function crypto_box_seal_open(
1424          $ciphertext,
1425          #[\SensitiveParameter]
1426          $keypair
1427      ) {
1428          /* Type checks: */
1429          ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
1430          ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 2);
1431  
1432          /* Input validation: */
1433          if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
1434              throw new SodiumException('Argument 2 must be CRYPTO_BOX_KEYPAIRBYTES long.');
1435          }
1436  
1437          if (self::useNewSodiumAPI()) {
1438              /**
1439               * @psalm-suppress InvalidReturnStatement
1440               * @psalm-suppress FalsableReturnStatement
1441               */
1442              return sodium_crypto_box_seal_open($ciphertext, $keypair);
1443          }
1444          if (self::use_fallback('crypto_box_seal_open')) {
1445              return call_user_func('\\Sodium\\crypto_box_seal_open', $ciphertext, $keypair);
1446          }
1447          if (PHP_INT_SIZE === 4) {
1448              return ParagonIE_Sodium_Crypto32::box_seal_open($ciphertext, $keypair);
1449          }
1450          return ParagonIE_Sodium_Crypto::box_seal_open($ciphertext, $keypair);
1451      }
1452  
1453      /**
1454       * Generate a new random X25519 keypair.
1455       *
1456       * @return string A 64-byte string; the first 32 are your secret key, while
1457       *                the last 32 are your public key. crypto_box_secretkey()
1458       *                and crypto_box_publickey() exist to separate them so you
1459       *                don't accidentally get them mixed up!
1460       * @throws SodiumException
1461       * @throws TypeError
1462       * @psalm-suppress MixedArgument
1463       */
1464      public static function crypto_box_keypair()
1465      {
1466          if (self::useNewSodiumAPI()) {
1467              return (string) sodium_crypto_box_keypair();
1468          }
1469          if (self::use_fallback('crypto_box_keypair')) {
1470              return (string) call_user_func('\\Sodium\\crypto_box_keypair');
1471          }
1472          if (PHP_INT_SIZE === 4) {
1473              return ParagonIE_Sodium_Crypto32::box_keypair();
1474          }
1475          return ParagonIE_Sodium_Crypto::box_keypair();
1476      }
1477  
1478      /**
1479       * Combine two keys into a keypair for use in library methods that expect
1480       * a keypair. This doesn't necessarily have to be the same person's keys.
1481       *
1482       * @param string $secretKey Secret key
1483       * @param string $publicKey Public key
1484       * @return string    Keypair
1485       * @throws SodiumException
1486       * @throws TypeError
1487       * @psalm-suppress MixedArgument
1488       */
1489      public static function crypto_box_keypair_from_secretkey_and_publickey(
1490          #[\SensitiveParameter]
1491          $secretKey,
1492          $publicKey
1493      ) {
1494          /* Type checks: */
1495          ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 1);
1496          ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, 'string', 2);
1497  
1498          /* Input validation: */
1499          if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
1500              throw new SodiumException('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
1501          }
1502          if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
1503              throw new SodiumException('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
1504          }
1505  
1506          if (self::useNewSodiumAPI()) {
1507              return (string) sodium_crypto_box_keypair_from_secretkey_and_publickey($secretKey, $publicKey);
1508          }
1509          if (self::use_fallback('crypto_box_keypair_from_secretkey_and_publickey')) {
1510              return (string) call_user_func('\\Sodium\\crypto_box_keypair_from_secretkey_and_publickey', $secretKey, $publicKey);
1511          }
1512          if (PHP_INT_SIZE === 4) {
1513              return ParagonIE_Sodium_Crypto32::box_keypair_from_secretkey_and_publickey($secretKey, $publicKey);
1514          }
1515          return ParagonIE_Sodium_Crypto::box_keypair_from_secretkey_and_publickey($secretKey, $publicKey);
1516      }
1517  
1518      /**
1519       * Decrypt a message previously encrypted with crypto_box().
1520       *
1521       * @param string $ciphertext Encrypted message
1522       * @param string $nonce      Number to only be used Once; must be 24 bytes
1523       * @param string $keypair    Your secret key and the sender's public key
1524       * @return string            The original plaintext message
1525       * @throws SodiumException
1526       * @throws TypeError
1527       * @psalm-suppress MixedArgument
1528       * @psalm-suppress MixedInferredReturnType
1529       * @psalm-suppress MixedReturnStatement
1530       */
1531      public static function crypto_box_open(
1532          $ciphertext,
1533          $nonce,
1534          #[\SensitiveParameter]
1535          $keypair
1536      ) {
1537          /* Type checks: */
1538          ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
1539          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
1540          ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 3);
1541  
1542          /* Input validation: */
1543          if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) < self::CRYPTO_BOX_MACBYTES) {
1544              throw new SodiumException('Argument 1 must be at least CRYPTO_BOX_MACBYTES long.');
1545          }
1546          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_BOX_NONCEBYTES) {
1547              throw new SodiumException('Argument 2 must be CRYPTO_BOX_NONCEBYTES long.');
1548          }
1549          if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
1550              throw new SodiumException('Argument 3 must be CRYPTO_BOX_KEYPAIRBYTES long.');
1551          }
1552  
1553          if (self::useNewSodiumAPI()) {
1554              /**
1555               * @psalm-suppress InvalidReturnStatement
1556               * @psalm-suppress FalsableReturnStatement
1557               */
1558              return sodium_crypto_box_open($ciphertext, $nonce, $keypair);
1559          }
1560          if (self::use_fallback('crypto_box_open')) {
1561              return call_user_func('\\Sodium\\crypto_box_open', $ciphertext, $nonce, $keypair);
1562          }
1563          if (PHP_INT_SIZE === 4) {
1564              return ParagonIE_Sodium_Crypto32::box_open($ciphertext, $nonce, $keypair);
1565          }
1566          return ParagonIE_Sodium_Crypto::box_open($ciphertext, $nonce, $keypair);
1567      }
1568  
1569      /**
1570       * Extract the public key from a crypto_box keypair.
1571       *
1572       * @param string $keypair Keypair containing secret and public key
1573       * @return string         Your crypto_box public key
1574       * @throws SodiumException
1575       * @throws TypeError
1576       * @psalm-suppress MixedArgument
1577       */
1578      public static function crypto_box_publickey(
1579          #[\SensitiveParameter]
1580          $keypair
1581      ) {
1582          /* Type checks: */
1583          ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 1);
1584  
1585          /* Input validation: */
1586          if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
1587              throw new SodiumException('Argument 1 must be CRYPTO_BOX_KEYPAIRBYTES long.');
1588          }
1589  
1590          if (self::useNewSodiumAPI()) {
1591              return (string) sodium_crypto_box_publickey($keypair);
1592          }
1593          if (self::use_fallback('crypto_box_publickey')) {
1594              return (string) call_user_func('\\Sodium\\crypto_box_publickey', $keypair);
1595          }
1596          if (PHP_INT_SIZE === 4) {
1597              return ParagonIE_Sodium_Crypto32::box_publickey($keypair);
1598          }
1599          return ParagonIE_Sodium_Crypto::box_publickey($keypair);
1600      }
1601  
1602      /**
1603       * Calculate the X25519 public key from a given X25519 secret key.
1604       *
1605       * @param string $secretKey Any X25519 secret key
1606       * @return string           The corresponding X25519 public key
1607       * @throws SodiumException
1608       * @throws TypeError
1609       * @psalm-suppress MixedArgument
1610       */
1611      public static function crypto_box_publickey_from_secretkey(
1612          #[\SensitiveParameter]
1613          $secretKey
1614      ) {
1615          /* Type checks: */
1616          ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 1);
1617  
1618          /* Input validation: */
1619          if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
1620              throw new SodiumException('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
1621          }
1622  
1623          if (self::useNewSodiumAPI()) {
1624              return (string) sodium_crypto_box_publickey_from_secretkey($secretKey);
1625          }
1626          if (self::use_fallback('crypto_box_publickey_from_secretkey')) {
1627              return (string) call_user_func('\\Sodium\\crypto_box_publickey_from_secretkey', $secretKey);
1628          }
1629          if (PHP_INT_SIZE === 4) {
1630              return ParagonIE_Sodium_Crypto32::box_publickey_from_secretkey($secretKey);
1631          }
1632          return ParagonIE_Sodium_Crypto::box_publickey_from_secretkey($secretKey);
1633      }
1634  
1635      /**
1636       * Extract the secret key from a crypto_box keypair.
1637       *
1638       * @param string $keypair
1639       * @return string         Your crypto_box secret key
1640       * @throws SodiumException
1641       * @throws TypeError
1642       * @psalm-suppress MixedArgument
1643       */
1644      public static function crypto_box_secretkey(
1645          #[\SensitiveParameter]
1646          $keypair
1647      ) {
1648          /* Type checks: */
1649          ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 1);
1650  
1651          /* Input validation: */
1652          if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
1653              throw new SodiumException('Argument 1 must be CRYPTO_BOX_KEYPAIRBYTES long.');
1654          }
1655  
1656          if (self::useNewSodiumAPI()) {
1657              return (string) sodium_crypto_box_secretkey($keypair);
1658          }
1659          if (self::use_fallback('crypto_box_secretkey')) {
1660              return (string) call_user_func('\\Sodium\\crypto_box_secretkey', $keypair);
1661          }
1662          if (PHP_INT_SIZE === 4) {
1663              return ParagonIE_Sodium_Crypto32::box_secretkey($keypair);
1664          }
1665          return ParagonIE_Sodium_Crypto::box_secretkey($keypair);
1666      }
1667  
1668      /**
1669       * Generate an X25519 keypair from a seed.
1670       *
1671       * @param string $seed
1672       * @return string
1673       * @throws SodiumException
1674       * @throws TypeError
1675       * @psalm-suppress MixedArgument
1676       * @psalm-suppress UndefinedFunction
1677       */
1678      public static function crypto_box_seed_keypair(
1679          #[\SensitiveParameter]
1680          $seed
1681      ) {
1682          /* Type checks: */
1683          ParagonIE_Sodium_Core_Util::declareScalarType($seed, 'string', 1);
1684  
1685          if (self::useNewSodiumAPI()) {
1686              return (string) sodium_crypto_box_seed_keypair($seed);
1687          }
1688          if (self::use_fallback('crypto_box_seed_keypair')) {
1689              return (string) call_user_func('\\Sodium\\crypto_box_seed_keypair', $seed);
1690          }
1691          if (PHP_INT_SIZE === 4) {
1692              return ParagonIE_Sodium_Crypto32::box_seed_keypair($seed);
1693          }
1694          return ParagonIE_Sodium_Crypto::box_seed_keypair($seed);
1695      }
1696  
1697      /**
1698       * Calculates a BLAKE2b hash, with an optional key.
1699       *
1700       * @param string      $message The message to be hashed
1701       * @param string|null $key     If specified, must be a string between 16
1702       *                             and 64 bytes long
1703       * @param int         $length  Output length in bytes; must be between 16
1704       *                             and 64 (default = 32)
1705       * @return string              Raw binary
1706       * @throws SodiumException
1707       * @throws TypeError
1708       * @psalm-suppress MixedArgument
1709       */
1710      public static function crypto_generichash(
1711          $message,
1712          #[\SensitiveParameter]
1713          $key = '',
1714          $length = self::CRYPTO_GENERICHASH_BYTES
1715      ) {
1716          /* Type checks: */
1717          ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
1718          if (is_null($key)) {
1719              $key = '';
1720          }
1721          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 2);
1722          ParagonIE_Sodium_Core_Util::declareScalarType($length, 'int', 3);
1723  
1724          /* Input validation: */
1725          if (!empty($key)) {
1726              if (ParagonIE_Sodium_Core_Util::strlen($key) < self::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
1727                  throw new SodiumException('Unsupported key size. Must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes long.');
1728              }
1729              if (ParagonIE_Sodium_Core_Util::strlen($key) > self::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
1730                  throw new SodiumException('Unsupported key size. Must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes long.');
1731              }
1732          }
1733  
1734          if (self::useNewSodiumAPI()) {
1735              return (string) sodium_crypto_generichash($message, $key, $length);
1736          }
1737          if (self::use_fallback('crypto_generichash')) {
1738              return (string) call_user_func('\\Sodium\\crypto_generichash', $message, $key, $length);
1739          }
1740          if (PHP_INT_SIZE === 4) {
1741              return ParagonIE_Sodium_Crypto32::generichash($message, $key, $length);
1742          }
1743          return ParagonIE_Sodium_Crypto::generichash($message, $key, $length);
1744      }
1745  
1746      /**
1747       * Get the final BLAKE2b hash output for a given context.
1748       *
1749       * @param string $ctx BLAKE2 hashing context. Generated by crypto_generichash_init().
1750       * @param int $length Hash output size.
1751       * @return string     Final BLAKE2b hash.
1752       * @throws SodiumException
1753       * @throws TypeError
1754       * @psalm-suppress MixedArgument
1755       * @psalm-suppress ReferenceConstraintViolation
1756       * @psalm-suppress ConflictingReferenceConstraint
1757       */
1758      public static function crypto_generichash_final(
1759          #[\SensitiveParameter]
1760          &$ctx,
1761          $length = self::CRYPTO_GENERICHASH_BYTES
1762      ) {
1763          /* Type checks: */
1764          ParagonIE_Sodium_Core_Util::declareScalarType($ctx, 'string', 1);
1765          ParagonIE_Sodium_Core_Util::declareScalarType($length, 'int', 2);
1766  
1767          if (self::useNewSodiumAPI()) {
1768              return sodium_crypto_generichash_final($ctx, $length);
1769          }
1770          if (self::use_fallback('crypto_generichash_final')) {
1771              $func = '\\Sodium\\crypto_generichash_final';
1772              return (string) $func($ctx, $length);
1773          }
1774          if ($length < 1) {
1775              try {
1776                  self::memzero($ctx);
1777              } catch (SodiumException $ex) {
1778                  unset($ctx);
1779              }
1780              return '';
1781          }
1782          if (PHP_INT_SIZE === 4) {
1783              $result = ParagonIE_Sodium_Crypto32::generichash_final($ctx, $length);
1784          } else {
1785              $result = ParagonIE_Sodium_Crypto::generichash_final($ctx, $length);
1786          }
1787          try {
1788              self::memzero($ctx);
1789          } catch (SodiumException $ex) {
1790              unset($ctx);
1791          }
1792          return $result;
1793      }
1794  
1795      /**
1796       * Initialize a BLAKE2b hashing context, for use in a streaming interface.
1797       *
1798       * @param string|null $key If specified must be a string between 16 and 64 bytes
1799       * @param int $length      The size of the desired hash output
1800       * @return string          A BLAKE2 hashing context, encoded as a string
1801       *                         (To be 100% compatible with ext/libsodium)
1802       * @throws SodiumException
1803       * @throws TypeError
1804       * @psalm-suppress MixedArgument
1805       */
1806      public static function crypto_generichash_init(
1807          #[\SensitiveParameter]
1808          $key = '',
1809          $length = self::CRYPTO_GENERICHASH_BYTES
1810      ) {
1811          /* Type checks: */
1812          if (is_null($key)) {
1813              $key = '';
1814          }
1815          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 1);
1816          ParagonIE_Sodium_Core_Util::declareScalarType($length, 'int', 2);
1817  
1818          /* Input validation: */
1819          if (!empty($key)) {
1820              if (ParagonIE_Sodium_Core_Util::strlen($key) < self::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
1821                  throw new SodiumException('Unsupported key size. Must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes long.');
1822              }
1823              if (ParagonIE_Sodium_Core_Util::strlen($key) > self::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
1824                  throw new SodiumException('Unsupported key size. Must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes long.');
1825              }
1826          }
1827  
1828          if (self::useNewSodiumAPI()) {
1829              return sodium_crypto_generichash_init($key, $length);
1830          }
1831          if (self::use_fallback('crypto_generichash_init')) {
1832              return (string) call_user_func('\\Sodium\\crypto_generichash_init', $key, $length);
1833          }
1834          if (PHP_INT_SIZE === 4) {
1835              return ParagonIE_Sodium_Crypto32::generichash_init($key, $length);
1836          }
1837          return ParagonIE_Sodium_Crypto::generichash_init($key, $length);
1838      }
1839  
1840      /**
1841       * Initialize a BLAKE2b hashing context, for use in a streaming interface.
1842       *
1843       * @param string|null $key If specified must be a string between 16 and 64 bytes
1844       * @param int $length      The size of the desired hash output
1845       * @param string $salt     Salt (up to 16 bytes)
1846       * @param string $personal Personalization string (up to 16 bytes)
1847       * @return string          A BLAKE2 hashing context, encoded as a string
1848       *                         (To be 100% compatible with ext/libsodium)
1849       * @throws SodiumException
1850       * @throws TypeError
1851       * @psalm-suppress MixedArgument
1852       */
1853      public static function crypto_generichash_init_salt_personal(
1854          #[\SensitiveParameter]
1855          $key = '',
1856          $length = self::CRYPTO_GENERICHASH_BYTES,
1857          $salt = '',
1858          $personal = ''
1859      ) {
1860          /* Type checks: */
1861          if (is_null($key)) {
1862              $key = '';
1863          }
1864          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 1);
1865          ParagonIE_Sodium_Core_Util::declareScalarType($length, 'int', 2);
1866          ParagonIE_Sodium_Core_Util::declareScalarType($salt, 'string', 3);
1867          ParagonIE_Sodium_Core_Util::declareScalarType($personal, 'string', 4);
1868          $salt = str_pad($salt, 16, "\0", STR_PAD_RIGHT);
1869          $personal = str_pad($personal, 16, "\0", STR_PAD_RIGHT);
1870  
1871          /* Input validation: */
1872          if (!empty($key)) {
1873              /*
1874              if (ParagonIE_Sodium_Core_Util::strlen($key) < self::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
1875                  throw new SodiumException('Unsupported key size. Must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes long.');
1876              }
1877              */
1878              if (ParagonIE_Sodium_Core_Util::strlen($key) > self::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
1879                  throw new SodiumException('Unsupported key size. Must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes long.');
1880              }
1881          }
1882          if (PHP_INT_SIZE === 4) {
1883              return ParagonIE_Sodium_Crypto32::generichash_init_salt_personal($key, $length, $salt, $personal);
1884          }
1885          return ParagonIE_Sodium_Crypto::generichash_init_salt_personal($key, $length, $salt, $personal);
1886      }
1887  
1888      /**
1889       * Update a BLAKE2b hashing context with additional data.
1890       *
1891       * @param string $ctx    BLAKE2 hashing context. Generated by crypto_generichash_init().
1892       *                       $ctx is passed by reference and gets updated in-place.
1893       * @param-out string $ctx
1894       * @param string $message The message to append to the existing hash state.
1895       * @return void
1896       * @throws SodiumException
1897       * @throws TypeError
1898       * @psalm-suppress MixedArgument
1899       * @psalm-suppress ReferenceConstraintViolation
1900       */
1901      public static function crypto_generichash_update(
1902          #[\SensitiveParameter]
1903          &$ctx,
1904          $message
1905      ) {
1906          /* Type checks: */
1907          ParagonIE_Sodium_Core_Util::declareScalarType($ctx, 'string', 1);
1908          ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 2);
1909  
1910          if (self::useNewSodiumAPI()) {
1911              sodium_crypto_generichash_update($ctx, $message);
1912              return;
1913          }
1914          if (self::use_fallback('crypto_generichash_update')) {
1915              $func = '\\Sodium\\crypto_generichash_update';
1916              $func($ctx, $message);
1917              return;
1918          }
1919          if (PHP_INT_SIZE === 4) {
1920              $ctx = ParagonIE_Sodium_Crypto32::generichash_update($ctx, $message);
1921          } else {
1922              $ctx = ParagonIE_Sodium_Crypto::generichash_update($ctx, $message);
1923          }
1924      }
1925  
1926      /**
1927       * @return string
1928       * @throws Exception
1929       * @throws Error
1930       */
1931      public static function crypto_generichash_keygen()
1932      {
1933          return random_bytes(self::CRYPTO_GENERICHASH_KEYBYTES);
1934      }
1935  
1936      /**
1937       * @param int $subkey_len
1938       * @param int $subkey_id
1939       * @param string $context
1940       * @param string $key
1941       * @return string
1942       * @throws SodiumException
1943       */
1944      public static function crypto_kdf_derive_from_key(
1945          $subkey_len,
1946          $subkey_id,
1947          $context,
1948          #[\SensitiveParameter]
1949          $key
1950      ) {
1951          ParagonIE_Sodium_Core_Util::declareScalarType($subkey_len, 'int', 1);
1952          ParagonIE_Sodium_Core_Util::declareScalarType($subkey_id, 'int', 2);
1953          ParagonIE_Sodium_Core_Util::declareScalarType($context, 'string', 3);
1954          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
1955          $subkey_id = (int) $subkey_id;
1956          $subkey_len = (int) $subkey_len;
1957          $context = (string) $context;
1958          $key = (string) $key;
1959  
1960          if ($subkey_len < self::CRYPTO_KDF_BYTES_MIN) {
1961              throw new SodiumException('subkey cannot be smaller than SODIUM_CRYPTO_KDF_BYTES_MIN');
1962          }
1963          if ($subkey_len > self::CRYPTO_KDF_BYTES_MAX) {
1964              throw new SodiumException('subkey cannot be larger than SODIUM_CRYPTO_KDF_BYTES_MAX');
1965          }
1966          if ($subkey_id < 0) {
1967              throw new SodiumException('subkey_id cannot be negative');
1968          }
1969          if (ParagonIE_Sodium_Core_Util::strlen($context) !== self::CRYPTO_KDF_CONTEXTBYTES) {
1970              throw new SodiumException('context should be SODIUM_CRYPTO_KDF_CONTEXTBYTES bytes');
1971          }
1972          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_KDF_KEYBYTES) {
1973              throw new SodiumException('key should be SODIUM_CRYPTO_KDF_KEYBYTES bytes');
1974          }
1975  
1976          $salt = ParagonIE_Sodium_Core_Util::store64_le($subkey_id);
1977          $state = self::crypto_generichash_init_salt_personal(
1978              $key,
1979              $subkey_len,
1980              $salt,
1981              $context
1982          );
1983          return self::crypto_generichash_final($state, $subkey_len);
1984      }
1985  
1986      /**
1987       * @return string
1988       * @throws Exception
1989       * @throws Error
1990       */
1991      public static function crypto_kdf_keygen()
1992      {
1993          return random_bytes(self::CRYPTO_KDF_KEYBYTES);
1994      }
1995  
1996      /**
1997       * Perform a key exchange, between a designated client and a server.
1998       *
1999       * Typically, you would designate one machine to be the client and the
2000       * other to be the server. The first two keys are what you'd expect for
2001       * scalarmult() below, but the latter two public keys don't swap places.
2002       *
2003       * | ALICE                          | BOB                                 |
2004       * | Client                         | Server                              |
2005       * |--------------------------------|-------------------------------------|
2006       * | shared = crypto_kx(            | shared = crypto_kx(                 |
2007       * |     alice_sk,                  |     bob_sk,                         | <- contextual
2008       * |     bob_pk,                    |     alice_pk,                       | <- contextual
2009       * |     alice_pk,                  |     alice_pk,                       | <----- static
2010       * |     bob_pk                     |     bob_pk                          | <----- static
2011       * | )                              | )                                   |
2012       *
2013       * They are used along with the scalarmult product to generate a 256-bit
2014       * BLAKE2b hash unique to the client and server keys.
2015       *
2016       * @param string $my_secret
2017       * @param string $their_public
2018       * @param string $client_public
2019       * @param string $server_public
2020       * @param bool $dontFallback
2021       * @return string
2022       * @throws SodiumException
2023       * @throws TypeError
2024       * @psalm-suppress MixedArgument
2025       */
2026      public static function crypto_kx(
2027          #[\SensitiveParameter]
2028          $my_secret,
2029          $their_public,
2030          $client_public,
2031          $server_public,
2032          $dontFallback = false
2033      ) {
2034          /* Type checks: */
2035          ParagonIE_Sodium_Core_Util::declareScalarType($my_secret, 'string', 1);
2036          ParagonIE_Sodium_Core_Util::declareScalarType($their_public, 'string', 2);
2037          ParagonIE_Sodium_Core_Util::declareScalarType($client_public, 'string', 3);
2038          ParagonIE_Sodium_Core_Util::declareScalarType($server_public, 'string', 4);
2039  
2040          /* Input validation: */
2041          if (ParagonIE_Sodium_Core_Util::strlen($my_secret) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
2042              throw new SodiumException('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
2043          }
2044          if (ParagonIE_Sodium_Core_Util::strlen($their_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
2045              throw new SodiumException('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
2046          }
2047          if (ParagonIE_Sodium_Core_Util::strlen($client_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
2048              throw new SodiumException('Argument 3 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
2049          }
2050          if (ParagonIE_Sodium_Core_Util::strlen($server_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
2051              throw new SodiumException('Argument 4 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
2052          }
2053  
2054          if (self::useNewSodiumAPI() && !$dontFallback) {
2055              if (is_callable('sodium_crypto_kx')) {
2056                  return (string) sodium_crypto_kx(
2057                      $my_secret,
2058                      $their_public,
2059                      $client_public,
2060                      $server_public
2061                  );
2062              }
2063          }
2064          if (self::use_fallback('crypto_kx')) {
2065              return (string) call_user_func(
2066                  '\\Sodium\\crypto_kx',
2067                  $my_secret,
2068                  $their_public,
2069                  $client_public,
2070                  $server_public
2071              );
2072          }
2073          if (PHP_INT_SIZE === 4) {
2074              return ParagonIE_Sodium_Crypto32::keyExchange(
2075                  $my_secret,
2076                  $their_public,
2077                  $client_public,
2078                  $server_public
2079              );
2080          }
2081          return ParagonIE_Sodium_Crypto::keyExchange(
2082              $my_secret,
2083              $their_public,
2084              $client_public,
2085              $server_public
2086          );
2087      }
2088  
2089      /**
2090       * @param string $seed
2091       * @return string
2092       * @throws SodiumException
2093       */
2094      public static function crypto_kx_seed_keypair(
2095          #[\SensitiveParameter]
2096          $seed
2097      ) {
2098          ParagonIE_Sodium_Core_Util::declareScalarType($seed, 'string', 1);
2099  
2100          $seed = (string) $seed;
2101  
2102          if (ParagonIE_Sodium_Core_Util::strlen($seed) !== self::CRYPTO_KX_SEEDBYTES) {
2103              throw new SodiumException('seed must be SODIUM_CRYPTO_KX_SEEDBYTES bytes');
2104          }
2105  
2106          $sk = self::crypto_generichash($seed, '', self::CRYPTO_KX_SECRETKEYBYTES);
2107          $pk = self::crypto_scalarmult_base($sk);
2108          return $sk . $pk;
2109      }
2110  
2111      /**
2112       * @return string
2113       * @throws Exception
2114       */
2115      public static function crypto_kx_keypair()
2116      {
2117          $sk = self::randombytes_buf(self::CRYPTO_KX_SECRETKEYBYTES);
2118          $pk = self::crypto_scalarmult_base($sk);
2119          return $sk . $pk;
2120      }
2121  
2122      /**
2123       * @param string $keypair
2124       * @param string $serverPublicKey
2125       * @return array{0: string, 1: string}
2126       * @throws SodiumException
2127       */
2128      public static function crypto_kx_client_session_keys(
2129          #[\SensitiveParameter]
2130          $keypair,
2131          $serverPublicKey
2132      ) {
2133          ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 1);
2134          ParagonIE_Sodium_Core_Util::declareScalarType($serverPublicKey, 'string', 2);
2135  
2136          $keypair = (string) $keypair;
2137          $serverPublicKey = (string) $serverPublicKey;
2138  
2139          if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_KX_KEYPAIRBYTES) {
2140              throw new SodiumException('keypair should be SODIUM_CRYPTO_KX_KEYPAIRBYTES bytes');
2141          }
2142          if (ParagonIE_Sodium_Core_Util::strlen($serverPublicKey) !== self::CRYPTO_KX_PUBLICKEYBYTES) {
2143              throw new SodiumException('public keys must be SODIUM_CRYPTO_KX_PUBLICKEYBYTES bytes');
2144          }
2145  
2146          $sk = self::crypto_kx_secretkey($keypair);
2147          $pk = self::crypto_kx_publickey($keypair);
2148          $h = self::crypto_generichash_init(null, self::CRYPTO_KX_SESSIONKEYBYTES * 2);
2149          self::crypto_generichash_update($h, self::crypto_scalarmult($sk, $serverPublicKey));
2150          self::crypto_generichash_update($h, $pk);
2151          self::crypto_generichash_update($h, $serverPublicKey);
2152          $sessionKeys = self::crypto_generichash_final($h, self::CRYPTO_KX_SESSIONKEYBYTES * 2);
2153          return array(
2154              ParagonIE_Sodium_Core_Util::substr(
2155                  $sessionKeys,
2156                  0,
2157                  self::CRYPTO_KX_SESSIONKEYBYTES
2158              ),
2159              ParagonIE_Sodium_Core_Util::substr(
2160                  $sessionKeys,
2161                  self::CRYPTO_KX_SESSIONKEYBYTES,
2162                  self::CRYPTO_KX_SESSIONKEYBYTES
2163              )
2164          );
2165      }
2166  
2167      /**
2168       * @param string $keypair
2169       * @param string $clientPublicKey
2170       * @return array{0: string, 1: string}
2171       * @throws SodiumException
2172       */
2173      public static function crypto_kx_server_session_keys(
2174          #[\SensitiveParameter]
2175          $keypair,
2176          $clientPublicKey
2177      ) {
2178          ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 1);
2179          ParagonIE_Sodium_Core_Util::declareScalarType($clientPublicKey, 'string', 2);
2180  
2181          $keypair = (string) $keypair;
2182          $clientPublicKey = (string) $clientPublicKey;
2183  
2184          if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_KX_KEYPAIRBYTES) {
2185              throw new SodiumException('keypair should be SODIUM_CRYPTO_KX_KEYPAIRBYTES bytes');
2186          }
2187          if (ParagonIE_Sodium_Core_Util::strlen($clientPublicKey) !== self::CRYPTO_KX_PUBLICKEYBYTES) {
2188              throw new SodiumException('public keys must be SODIUM_CRYPTO_KX_PUBLICKEYBYTES bytes');
2189          }
2190  
2191          $sk = self::crypto_kx_secretkey($keypair);
2192          $pk = self::crypto_kx_publickey($keypair);
2193          $h = self::crypto_generichash_init(null, self::CRYPTO_KX_SESSIONKEYBYTES * 2);
2194          self::crypto_generichash_update($h, self::crypto_scalarmult($sk, $clientPublicKey));
2195          self::crypto_generichash_update($h, $clientPublicKey);
2196          self::crypto_generichash_update($h, $pk);
2197          $sessionKeys = self::crypto_generichash_final($h, self::CRYPTO_KX_SESSIONKEYBYTES * 2);
2198          return array(
2199              ParagonIE_Sodium_Core_Util::substr(
2200                  $sessionKeys,
2201                  self::CRYPTO_KX_SESSIONKEYBYTES,
2202                  self::CRYPTO_KX_SESSIONKEYBYTES
2203              ),
2204              ParagonIE_Sodium_Core_Util::substr(
2205                  $sessionKeys,
2206                  0,
2207                  self::CRYPTO_KX_SESSIONKEYBYTES
2208              )
2209          );
2210      }
2211  
2212      /**
2213       * @param string $kp
2214       * @return string
2215       * @throws SodiumException
2216       */
2217      public static function crypto_kx_secretkey(
2218          #[\SensitiveParameter]
2219          $kp
2220      ) {
2221          return ParagonIE_Sodium_Core_Util::substr(
2222              $kp,
2223              0,
2224              self::CRYPTO_KX_SECRETKEYBYTES
2225          );
2226      }
2227  
2228      /**
2229       * @param string $kp
2230       * @return string
2231       * @throws SodiumException
2232       */
2233      public static function crypto_kx_publickey($kp)
2234      {
2235          return ParagonIE_Sodium_Core_Util::substr(
2236              $kp,
2237              self::CRYPTO_KX_SECRETKEYBYTES,
2238              self::CRYPTO_KX_PUBLICKEYBYTES
2239          );
2240      }
2241  
2242      /**
2243       * @param int $outlen
2244       * @param string $passwd
2245       * @param string $salt
2246       * @param int $opslimit
2247       * @param int $memlimit
2248       * @param int|null $alg
2249       * @return string
2250       * @throws SodiumException
2251       * @throws TypeError
2252       * @psalm-suppress MixedArgument
2253       */
2254      public static function crypto_pwhash(
2255          $outlen,
2256          #[\SensitiveParameter]
2257          $passwd,
2258          $salt,
2259          $opslimit,
2260          $memlimit,
2261          $alg = null
2262      ) {
2263          ParagonIE_Sodium_Core_Util::declareScalarType($outlen, 'int', 1);
2264          ParagonIE_Sodium_Core_Util::declareScalarType($passwd, 'string', 2);
2265          ParagonIE_Sodium_Core_Util::declareScalarType($salt,  'string', 3);
2266          ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, 'int', 4);
2267          ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, 'int', 5);
2268  
2269          if (self::useNewSodiumAPI()) {
2270              if (!is_null($alg)) {
2271                  ParagonIE_Sodium_Core_Util::declareScalarType($alg, 'int', 6);
2272                  return sodium_crypto_pwhash($outlen, $passwd, $salt, $opslimit, $memlimit, $alg);
2273              }
2274              return sodium_crypto_pwhash($outlen, $passwd, $salt, $opslimit, $memlimit);
2275          }
2276          if (self::use_fallback('crypto_pwhash')) {
2277              return (string) call_user_func('\\Sodium\\crypto_pwhash', $outlen, $passwd, $salt, $opslimit, $memlimit);
2278          }
2279          // This is the best we can do.
2280          throw new SodiumException(
2281              'This is not implemented, as it is not possible to implement Argon2i with acceptable performance in pure-PHP'
2282          );
2283      }
2284  
2285      /**
2286       * !Exclusive to sodium_compat!
2287       *
2288       * This returns TRUE if the native crypto_pwhash API is available by libsodium.
2289       * This returns FALSE if only sodium_compat is available.
2290       *
2291       * @return bool
2292       */
2293      public static function crypto_pwhash_is_available()
2294      {
2295          if (self::useNewSodiumAPI()) {
2296              return true;
2297          }
2298          if (self::use_fallback('crypto_pwhash')) {
2299              return true;
2300          }
2301          return false;
2302      }
2303  
2304      /**
2305       * @param string $passwd
2306       * @param int $opslimit
2307       * @param int $memlimit
2308       * @return string
2309       * @throws SodiumException
2310       * @throws TypeError
2311       * @psalm-suppress MixedArgument
2312       */
2313      public static function crypto_pwhash_str(
2314          #[\SensitiveParameter]
2315          $passwd,
2316          $opslimit,
2317          $memlimit
2318      ) {
2319          ParagonIE_Sodium_Core_Util::declareScalarType($passwd, 'string', 1);
2320          ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, 'int', 2);
2321          ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, 'int', 3);
2322  
2323          if (self::useNewSodiumAPI()) {
2324              return sodium_crypto_pwhash_str($passwd, $opslimit, $memlimit);
2325          }
2326          if (self::use_fallback('crypto_pwhash_str')) {
2327              return (string) call_user_func('\\Sodium\\crypto_pwhash_str', $passwd, $opslimit, $memlimit);
2328          }
2329          // This is the best we can do.
2330          throw new SodiumException(
2331              'This is not implemented, as it is not possible to implement Argon2i with acceptable performance in pure-PHP'
2332          );
2333      }
2334  
2335      /**
2336       * Do we need to rehash this password?
2337       *
2338       * @param string $hash
2339       * @param int $opslimit
2340       * @param int $memlimit
2341       * @return bool
2342       * @throws SodiumException
2343       */
2344      public static function crypto_pwhash_str_needs_rehash(
2345          #[\SensitiveParameter]
2346          $hash,
2347          $opslimit,
2348          $memlimit
2349      ) {
2350          ParagonIE_Sodium_Core_Util::declareScalarType($hash, 'string', 1);
2351          ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, 'int', 2);
2352          ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, 'int', 3);
2353  
2354          // Just grab the first 4 pieces.
2355          $pieces = explode('$', (string) $hash);
2356          $prefix = implode('$', array_slice($pieces, 0, 4));
2357  
2358          // Rebuild the expected header.
2359          /** @var int $ops */
2360          $ops = (int) $opslimit;
2361          /** @var int $mem */
2362          $mem = (int) $memlimit >> 10;
2363          $encoded = self::CRYPTO_PWHASH_STRPREFIX . 'v=19$m=' . $mem . ',t=' . $ops . ',p=1';
2364  
2365          // Do they match? If so, we don't need to rehash, so return false.
2366          return !ParagonIE_Sodium_Core_Util::hashEquals($encoded, $prefix);
2367      }
2368  
2369      /**
2370       * @param string $passwd
2371       * @param string $hash
2372       * @return bool
2373       * @throws SodiumException
2374       * @throws TypeError
2375       * @psalm-suppress MixedArgument
2376       */
2377      public static function crypto_pwhash_str_verify(
2378          #[\SensitiveParameter]
2379          $passwd,
2380          #[\SensitiveParameter]
2381          $hash
2382      ) {
2383          ParagonIE_Sodium_Core_Util::declareScalarType($passwd, 'string', 1);
2384          ParagonIE_Sodium_Core_Util::declareScalarType($hash, 'string', 2);
2385  
2386          if (self::useNewSodiumAPI()) {
2387              return (bool) sodium_crypto_pwhash_str_verify($passwd, $hash);
2388          }
2389          if (self::use_fallback('crypto_pwhash_str_verify')) {
2390              return (bool) call_user_func('\\Sodium\\crypto_pwhash_str_verify', $passwd, $hash);
2391          }
2392          // This is the best we can do.
2393          throw new SodiumException(
2394              'This is not implemented, as it is not possible to implement Argon2i with acceptable performance in pure-PHP'
2395          );
2396      }
2397  
2398      /**
2399       * @param int $outlen
2400       * @param string $passwd
2401       * @param string $salt
2402       * @param int $opslimit
2403       * @param int $memlimit
2404       * @return string
2405       * @throws SodiumException
2406       * @throws TypeError
2407       */
2408      public static function crypto_pwhash_scryptsalsa208sha256(
2409          $outlen,
2410          #[\SensitiveParameter]
2411          $passwd,
2412          $salt,
2413          $opslimit,
2414          $memlimit
2415      ) {
2416          ParagonIE_Sodium_Core_Util::declareScalarType($outlen, 'int', 1);
2417          ParagonIE_Sodium_Core_Util::declareScalarType($passwd, 'string', 2);
2418          ParagonIE_Sodium_Core_Util::declareScalarType($salt,  'string', 3);
2419          ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, 'int', 4);
2420          ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, 'int', 5);
2421  
2422          if (self::useNewSodiumAPI()) {
2423              return (string) sodium_crypto_pwhash_scryptsalsa208sha256(
2424                  (int) $outlen,
2425                  (string) $passwd,
2426                  (string) $salt,
2427                  (int) $opslimit,
2428                  (int) $memlimit
2429              );
2430          }
2431          if (self::use_fallback('crypto_pwhash_scryptsalsa208sha256')) {
2432              return (string) call_user_func(
2433                  '\\Sodium\\crypto_pwhash_scryptsalsa208sha256',
2434                  (int) $outlen,
2435                  (string) $passwd,
2436                  (string) $salt,
2437                  (int) $opslimit,
2438                  (int) $memlimit
2439              );
2440          }
2441          // This is the best we can do.
2442          throw new SodiumException(
2443              'This is not implemented, as it is not possible to implement Scrypt with acceptable performance in pure-PHP'
2444          );
2445      }
2446  
2447      /**
2448       * !Exclusive to sodium_compat!
2449       *
2450       * This returns TRUE if the native crypto_pwhash API is available by libsodium.
2451       * This returns FALSE if only sodium_compat is available.
2452       *
2453       * @return bool
2454       */
2455      public static function crypto_pwhash_scryptsalsa208sha256_is_available()
2456      {
2457          if (self::useNewSodiumAPI()) {
2458              return true;
2459          }
2460          if (self::use_fallback('crypto_pwhash_scryptsalsa208sha256')) {
2461              return true;
2462          }
2463          return false;
2464      }
2465  
2466      /**
2467       * @param string $passwd
2468       * @param int $opslimit
2469       * @param int $memlimit
2470       * @return string
2471       * @throws SodiumException
2472       * @throws TypeError
2473       */
2474      public static function crypto_pwhash_scryptsalsa208sha256_str(
2475          #[\SensitiveParameter]
2476          $passwd,
2477          $opslimit,
2478          $memlimit
2479      ) {
2480          ParagonIE_Sodium_Core_Util::declareScalarType($passwd, 'string', 1);
2481          ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, 'int', 2);
2482          ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, 'int', 3);
2483  
2484          if (self::useNewSodiumAPI()) {
2485              return (string) sodium_crypto_pwhash_scryptsalsa208sha256_str(
2486                  (string) $passwd,
2487                  (int) $opslimit,
2488                  (int) $memlimit
2489              );
2490          }
2491          if (self::use_fallback('crypto_pwhash_scryptsalsa208sha256_str')) {
2492              return (string) call_user_func(
2493                  '\\Sodium\\crypto_pwhash_scryptsalsa208sha256_str',
2494                  (string) $passwd,
2495                  (int) $opslimit,
2496                  (int) $memlimit
2497              );
2498          }
2499          // This is the best we can do.
2500          throw new SodiumException(
2501              'This is not implemented, as it is not possible to implement Scrypt with acceptable performance in pure-PHP'
2502          );
2503      }
2504  
2505      /**
2506       * @param string $passwd
2507       * @param string $hash
2508       * @return bool
2509       * @throws SodiumException
2510       * @throws TypeError
2511       */
2512      public static function crypto_pwhash_scryptsalsa208sha256_str_verify(
2513          #[\SensitiveParameter]
2514          $passwd,
2515          #[\SensitiveParameter]
2516          $hash
2517      ) {
2518          ParagonIE_Sodium_Core_Util::declareScalarType($passwd, 'string', 1);
2519          ParagonIE_Sodium_Core_Util::declareScalarType($hash, 'string', 2);
2520  
2521          if (self::useNewSodiumAPI()) {
2522              return (bool) sodium_crypto_pwhash_scryptsalsa208sha256_str_verify(
2523                  (string) $passwd,
2524                  (string) $hash
2525              );
2526          }
2527          if (self::use_fallback('crypto_pwhash_scryptsalsa208sha256_str_verify')) {
2528              return (bool) call_user_func(
2529                  '\\Sodium\\crypto_pwhash_scryptsalsa208sha256_str_verify',
2530                  (string) $passwd,
2531                  (string) $hash
2532              );
2533          }
2534          // This is the best we can do.
2535          throw new SodiumException(
2536              'This is not implemented, as it is not possible to implement Scrypt with acceptable performance in pure-PHP'
2537          );
2538      }
2539  
2540      /**
2541       * Calculate the shared secret between your secret key and your
2542       * recipient's public key.
2543       *
2544       * Algorithm: X25519 (ECDH over Curve25519)
2545       *
2546       * @param string $secretKey
2547       * @param string $publicKey
2548       * @return string
2549       * @throws SodiumException
2550       * @throws TypeError
2551       * @psalm-suppress MixedArgument
2552       */
2553      public static function crypto_scalarmult(
2554          #[\SensitiveParameter]
2555          $secretKey,
2556          $publicKey
2557      ) {
2558          /* Type checks: */
2559          ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 1);
2560          ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, 'string', 2);
2561  
2562          /* Input validation: */
2563          if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
2564              throw new SodiumException('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
2565          }
2566          if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
2567              throw new SodiumException('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
2568          }
2569  
2570          if (self::useNewSodiumAPI()) {
2571              return sodium_crypto_scalarmult($secretKey, $publicKey);
2572          }
2573          if (self::use_fallback('crypto_scalarmult')) {
2574              return (string) call_user_func('\\Sodium\\crypto_scalarmult', $secretKey, $publicKey);
2575          }
2576  
2577          /* Output validation: Forbid all-zero keys */
2578          if (ParagonIE_Sodium_Core_Util::hashEquals($secretKey, str_repeat("\0", self::CRYPTO_BOX_SECRETKEYBYTES))) {
2579              throw new SodiumException('Zero secret key is not allowed');
2580          }
2581          if (ParagonIE_Sodium_Core_Util::hashEquals($publicKey, str_repeat("\0", self::CRYPTO_BOX_PUBLICKEYBYTES))) {
2582              throw new SodiumException('Zero public key is not allowed');
2583          }
2584          if (PHP_INT_SIZE === 4) {
2585              return ParagonIE_Sodium_Crypto32::scalarmult($secretKey, $publicKey);
2586          }
2587          return ParagonIE_Sodium_Crypto::scalarmult($secretKey, $publicKey);
2588      }
2589  
2590      /**
2591       * Calculate an X25519 public key from an X25519 secret key.
2592       *
2593       * @param string $secretKey
2594       * @return string
2595       * @throws SodiumException
2596       * @throws TypeError
2597       * @psalm-suppress TooFewArguments
2598       * @psalm-suppress MixedArgument
2599       */
2600      public static function crypto_scalarmult_base(
2601          #[\SensitiveParameter]
2602          $secretKey
2603      ) {
2604          /* Type checks: */
2605          ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 1);
2606  
2607          /* Input validation: */
2608          if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
2609              throw new SodiumException('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
2610          }
2611  
2612          if (self::useNewSodiumAPI()) {
2613              return sodium_crypto_scalarmult_base($secretKey);
2614          }
2615          if (self::use_fallback('crypto_scalarmult_base')) {
2616              return (string) call_user_func('\\Sodium\\crypto_scalarmult_base', $secretKey);
2617          }
2618          if (ParagonIE_Sodium_Core_Util::hashEquals($secretKey, str_repeat("\0", self::CRYPTO_BOX_SECRETKEYBYTES))) {
2619              throw new SodiumException('Zero secret key is not allowed');
2620          }
2621          if (PHP_INT_SIZE === 4) {
2622              return ParagonIE_Sodium_Crypto32::scalarmult_base($secretKey);
2623          }
2624          return ParagonIE_Sodium_Crypto::scalarmult_base($secretKey);
2625      }
2626  
2627      /**
2628       * Authenticated symmetric-key encryption.
2629       *
2630       * Algorithm: XSalsa20-Poly1305
2631       *
2632       * @param string $plaintext The message you're encrypting
2633       * @param string $nonce A Number to be used Once; must be 24 bytes
2634       * @param string $key Symmetric encryption key
2635       * @return string           Ciphertext with Poly1305 MAC
2636       * @throws SodiumException
2637       * @throws TypeError
2638       * @psalm-suppress MixedArgument
2639       */
2640      public static function crypto_secretbox(
2641          #[\SensitiveParameter]
2642          $plaintext,
2643          $nonce,
2644          #[\SensitiveParameter]
2645          $key
2646      ) {
2647          /* Type checks: */
2648          ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
2649          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
2650          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
2651  
2652          /* Input validation: */
2653          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
2654              throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
2655          }
2656          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
2657              throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.');
2658          }
2659  
2660          if (self::useNewSodiumAPI()) {
2661              return sodium_crypto_secretbox($plaintext, $nonce, $key);
2662          }
2663          if (self::use_fallback('crypto_secretbox')) {
2664              return (string) call_user_func('\\Sodium\\crypto_secretbox', $plaintext, $nonce, $key);
2665          }
2666          if (PHP_INT_SIZE === 4) {
2667              return ParagonIE_Sodium_Crypto32::secretbox($plaintext, $nonce, $key);
2668          }
2669          return ParagonIE_Sodium_Crypto::secretbox($plaintext, $nonce, $key);
2670      }
2671  
2672      /**
2673       * Decrypts a message previously encrypted with crypto_secretbox().
2674       *
2675       * @param string $ciphertext Ciphertext with Poly1305 MAC
2676       * @param string $nonce      A Number to be used Once; must be 24 bytes
2677       * @param string $key        Symmetric encryption key
2678       * @return string            Original plaintext message
2679       * @throws SodiumException
2680       * @throws TypeError
2681       * @psalm-suppress MixedArgument
2682       * @psalm-suppress MixedInferredReturnType
2683       * @psalm-suppress MixedReturnStatement
2684       */
2685      public static function crypto_secretbox_open(
2686          $ciphertext,
2687          $nonce,
2688          #[\SensitiveParameter]
2689          $key
2690      ) {
2691          /* Type checks: */
2692          ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
2693          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
2694          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
2695  
2696          /* Input validation: */
2697          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
2698              throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
2699          }
2700          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
2701              throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.');
2702          }
2703  
2704          if (self::useNewSodiumAPI()) {
2705              /**
2706               * @psalm-suppress InvalidReturnStatement
2707               * @psalm-suppress FalsableReturnStatement
2708               */
2709              return sodium_crypto_secretbox_open($ciphertext, $nonce, $key);
2710          }
2711          if (self::use_fallback('crypto_secretbox_open')) {
2712              return call_user_func('\\Sodium\\crypto_secretbox_open', $ciphertext, $nonce, $key);
2713          }
2714          if (PHP_INT_SIZE === 4) {
2715              return ParagonIE_Sodium_Crypto32::secretbox_open($ciphertext, $nonce, $key);
2716          }
2717          return ParagonIE_Sodium_Crypto::secretbox_open($ciphertext, $nonce, $key);
2718      }
2719  
2720      /**
2721       * Return a secure random key for use with crypto_secretbox
2722       *
2723       * @return string
2724       * @throws Exception
2725       * @throws Error
2726       */
2727      public static function crypto_secretbox_keygen()
2728      {
2729          return random_bytes(self::CRYPTO_SECRETBOX_KEYBYTES);
2730      }
2731  
2732      /**
2733       * Authenticated symmetric-key encryption.
2734       *
2735       * Algorithm: XChaCha20-Poly1305
2736       *
2737       * @param string $plaintext The message you're encrypting
2738       * @param string $nonce     A Number to be used Once; must be 24 bytes
2739       * @param string $key       Symmetric encryption key
2740       * @return string           Ciphertext with Poly1305 MAC
2741       * @throws SodiumException
2742       * @throws TypeError
2743       * @psalm-suppress MixedArgument
2744       */
2745      public static function crypto_secretbox_xchacha20poly1305($plaintext, $nonce, $key)
2746      {
2747          /* Type checks: */
2748          ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
2749          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
2750          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
2751  
2752          /* Input validation: */
2753          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
2754              throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
2755          }
2756          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
2757              throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.');
2758          }
2759          if (PHP_INT_SIZE === 4) {
2760              return ParagonIE_Sodium_Crypto32::secretbox_xchacha20poly1305($plaintext, $nonce, $key);
2761          }
2762          return ParagonIE_Sodium_Crypto::secretbox_xchacha20poly1305($plaintext, $nonce, $key);
2763      }
2764      /**
2765       * Decrypts a message previously encrypted with crypto_secretbox_xchacha20poly1305().
2766       *
2767       * @param string $ciphertext Ciphertext with Poly1305 MAC
2768       * @param string $nonce      A Number to be used Once; must be 24 bytes
2769       * @param string $key        Symmetric encryption key
2770       * @return string            Original plaintext message
2771       * @throws SodiumException
2772       * @throws TypeError
2773       * @psalm-suppress MixedArgument
2774       */
2775      public static function crypto_secretbox_xchacha20poly1305_open(
2776          $ciphertext,
2777          $nonce,
2778          #[\SensitiveParameter]
2779          $key
2780      ) {
2781          /* Type checks: */
2782          ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
2783          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
2784          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
2785  
2786          /* Input validation: */
2787          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
2788              throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
2789          }
2790          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
2791              throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.');
2792          }
2793          if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) < self::CRYPTO_SECRETBOX_MACBYTES) {
2794              throw new SodiumException("Ciphertext must be at least CRYPTO_SECRETBOX_MACBYTES long");
2795          }
2796  
2797          if (PHP_INT_SIZE === 4) {
2798              return ParagonIE_Sodium_Crypto32::secretbox_xchacha20poly1305_open($ciphertext, $nonce, $key);
2799          }
2800          return ParagonIE_Sodium_Crypto::secretbox_xchacha20poly1305_open($ciphertext, $nonce, $key);
2801      }
2802  
2803      /**
2804       * @param string $key
2805       * @return array<int, string> Returns a state and a header.
2806       * @throws Exception
2807       * @throws SodiumException
2808       */
2809      public static function crypto_secretstream_xchacha20poly1305_init_push(
2810          #[\SensitiveParameter]
2811          $key
2812      ) {
2813          if (PHP_INT_SIZE === 4) {
2814              return ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_init_push($key);
2815          }
2816          return ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_init_push($key);
2817      }
2818  
2819      /**
2820       * @param string $header
2821       * @param string $key
2822       * @return string Returns a state.
2823       * @throws Exception
2824       */
2825      public static function crypto_secretstream_xchacha20poly1305_init_pull(
2826          $header,
2827          #[\SensitiveParameter]
2828          $key
2829      ) {
2830          if (ParagonIE_Sodium_Core_Util::strlen($header) < self::CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES) {
2831              throw new SodiumException(
2832                  'header size should be SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES bytes'
2833              );
2834          }
2835          if (PHP_INT_SIZE === 4) {
2836              return ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_init_pull($key, $header);
2837          }
2838          return ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_init_pull($key, $header);
2839      }
2840  
2841      /**
2842       * @param string $state
2843       * @param string $msg
2844       * @param string $aad
2845       * @param int $tag
2846       * @return string
2847       * @throws SodiumException
2848       */
2849      public static function crypto_secretstream_xchacha20poly1305_push(
2850          #[\SensitiveParameter]
2851          &$state,
2852          #[\SensitiveParameter]
2853          $msg,
2854          $aad = '',
2855          $tag = 0
2856      ) {
2857          if (PHP_INT_SIZE === 4) {
2858              return ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_push(
2859                  $state,
2860                  $msg,
2861                  $aad,
2862                  $tag
2863              );
2864          }
2865          return ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_push(
2866              $state,
2867              $msg,
2868              $aad,
2869              $tag
2870          );
2871      }
2872  
2873      /**
2874       * @param string $state
2875       * @param string $msg
2876       * @param string $aad
2877       * @return bool|array{0: string, 1: int}
2878       * @throws SodiumException
2879       */
2880      public static function crypto_secretstream_xchacha20poly1305_pull(
2881          #[\SensitiveParameter]
2882          &$state,
2883          $msg,
2884          $aad = ''
2885      ) {
2886          if (PHP_INT_SIZE === 4) {
2887              return ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_pull(
2888                  $state,
2889                  $msg,
2890                  $aad
2891              );
2892          }
2893          return ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_pull(
2894              $state,
2895              $msg,
2896              $aad
2897          );
2898      }
2899  
2900      /**
2901       * @return string
2902       * @throws Exception
2903       */
2904      public static function crypto_secretstream_xchacha20poly1305_keygen()
2905      {
2906          return random_bytes(self::CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_KEYBYTES);
2907      }
2908  
2909      /**
2910       * @param string $state
2911       * @return void
2912       * @throws SodiumException
2913       */
2914      public static function crypto_secretstream_xchacha20poly1305_rekey(
2915          #[\SensitiveParameter]
2916          &$state
2917      ) {
2918          if (PHP_INT_SIZE === 4) {
2919              ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_rekey($state);
2920          } else {
2921              ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_rekey($state);
2922          }
2923      }
2924  
2925      /**
2926       * Calculates a SipHash-2-4 hash of a message for a given key.
2927       *
2928       * @param string $message Input message
2929       * @param string $key SipHash-2-4 key
2930       * @return string         Hash
2931       * @throws SodiumException
2932       * @throws TypeError
2933       * @psalm-suppress MixedArgument
2934       * @psalm-suppress MixedInferredReturnType
2935       * @psalm-suppress MixedReturnStatement
2936       */
2937      public static function crypto_shorthash(
2938          $message,
2939          #[\SensitiveParameter]
2940          $key
2941      ) {
2942          /* Type checks: */
2943          ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
2944          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 2);
2945  
2946          /* Input validation: */
2947          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SHORTHASH_KEYBYTES) {
2948              throw new SodiumException('Argument 2 must be CRYPTO_SHORTHASH_KEYBYTES long.');
2949          }
2950  
2951          if (self::useNewSodiumAPI()) {
2952              return sodium_crypto_shorthash($message, $key);
2953          }
2954          if (self::use_fallback('crypto_shorthash')) {
2955              return (string) call_user_func('\\Sodium\\crypto_shorthash', $message, $key);
2956          }
2957          if (PHP_INT_SIZE === 4) {
2958              return ParagonIE_Sodium_Core32_SipHash::sipHash24($message, $key);
2959          }
2960          return ParagonIE_Sodium_Core_SipHash::sipHash24($message, $key);
2961      }
2962  
2963      /**
2964       * Return a secure random key for use with crypto_shorthash
2965       *
2966       * @return string
2967       * @throws Exception
2968       * @throws Error
2969       */
2970      public static function crypto_shorthash_keygen()
2971      {
2972          return random_bytes(self::CRYPTO_SHORTHASH_KEYBYTES);
2973      }
2974  
2975      /**
2976       * Returns a signed message. You probably want crypto_sign_detached()
2977       * instead, which only returns the signature.
2978       *
2979       * Algorithm: Ed25519 (EdDSA over Curve25519)
2980       *
2981       * @param string $message Message to be signed.
2982       * @param string $secretKey Secret signing key.
2983       * @return string           Signed message (signature is prefixed).
2984       * @throws SodiumException
2985       * @throws TypeError
2986       * @psalm-suppress MixedArgument
2987       * @psalm-suppress MixedInferredReturnType
2988       * @psalm-suppress MixedReturnStatement
2989       */
2990      public static function crypto_sign(
2991          $message,
2992          #[\SensitiveParameter]
2993          $secretKey
2994      ) {
2995          /* Type checks: */
2996          ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
2997          ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 2);
2998  
2999          /* Input validation: */
3000          if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
3001              throw new SodiumException('Argument 2 must be CRYPTO_SIGN_SECRETKEYBYTES long.');
3002          }
3003  
3004          if (self::useNewSodiumAPI()) {
3005              return sodium_crypto_sign($message, $secretKey);
3006          }
3007          if (self::use_fallback('crypto_sign')) {
3008              return (string) call_user_func('\\Sodium\\crypto_sign', $message, $secretKey);
3009          }
3010          if (PHP_INT_SIZE === 4) {
3011              return ParagonIE_Sodium_Crypto32::sign($message, $secretKey);
3012          }
3013          return ParagonIE_Sodium_Crypto::sign($message, $secretKey);
3014      }
3015  
3016      /**
3017       * Validates a signed message then returns the message.
3018       *
3019       * @param string $signedMessage A signed message
3020       * @param string $publicKey A public key
3021       * @return string               The original message (if the signature is
3022       *                              valid for this public key)
3023       * @throws SodiumException
3024       * @throws TypeError
3025       * @psalm-suppress MixedArgument
3026       * @psalm-suppress MixedInferredReturnType
3027       * @psalm-suppress MixedReturnStatement
3028       */
3029      public static function crypto_sign_open(
3030          $signedMessage,
3031          $publicKey
3032      ) {
3033          /* Type checks: */
3034          ParagonIE_Sodium_Core_Util::declareScalarType($signedMessage, 'string', 1);
3035          ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, 'string', 2);
3036  
3037          /* Input validation: */
3038          if (ParagonIE_Sodium_Core_Util::strlen($signedMessage) < self::CRYPTO_SIGN_BYTES) {
3039              throw new SodiumException('Argument 1 must be at least CRYPTO_SIGN_BYTES long.');
3040          }
3041          if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_SIGN_PUBLICKEYBYTES) {
3042              throw new SodiumException('Argument 2 must be CRYPTO_SIGN_PUBLICKEYBYTES long.');
3043          }
3044  
3045          if (self::useNewSodiumAPI()) {
3046              /**
3047               * @psalm-suppress InvalidReturnStatement
3048               * @psalm-suppress FalsableReturnStatement
3049               */
3050              return sodium_crypto_sign_open($signedMessage, $publicKey);
3051          }
3052          if (self::use_fallback('crypto_sign_open')) {
3053              return call_user_func('\\Sodium\\crypto_sign_open', $signedMessage, $publicKey);
3054          }
3055          if (PHP_INT_SIZE === 4) {
3056              return ParagonIE_Sodium_Crypto32::sign_open($signedMessage, $publicKey);
3057          }
3058          return ParagonIE_Sodium_Crypto::sign_open($signedMessage, $publicKey);
3059      }
3060  
3061      /**
3062       * Generate a new random Ed25519 keypair.
3063       *
3064       * @return string
3065       * @throws SodiumException
3066       * @throws TypeError
3067       */
3068      public static function crypto_sign_keypair()
3069      {
3070          if (self::useNewSodiumAPI()) {
3071              return sodium_crypto_sign_keypair();
3072          }
3073          if (self::use_fallback('crypto_sign_keypair')) {
3074              return (string) call_user_func('\\Sodium\\crypto_sign_keypair');
3075          }
3076          if (PHP_INT_SIZE === 4) {
3077              return ParagonIE_Sodium_Core32_Ed25519::keypair();
3078          }
3079          return ParagonIE_Sodium_Core_Ed25519::keypair();
3080      }
3081  
3082      /**
3083       * @param string $sk
3084       * @param string $pk
3085       * @return string
3086       * @throws SodiumException
3087       */
3088      public static function crypto_sign_keypair_from_secretkey_and_publickey(
3089          #[\SensitiveParameter]
3090          $sk,
3091          $pk
3092      )  {
3093          ParagonIE_Sodium_Core_Util::declareScalarType($sk, 'string', 1);
3094          ParagonIE_Sodium_Core_Util::declareScalarType($pk, 'string', 1);
3095          $sk = (string) $sk;
3096          $pk = (string) $pk;
3097  
3098          if (ParagonIE_Sodium_Core_Util::strlen($sk) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
3099              throw new SodiumException('secretkey should be SODIUM_CRYPTO_SIGN_SECRETKEYBYTES bytes');
3100          }
3101          if (ParagonIE_Sodium_Core_Util::strlen($pk) !== self::CRYPTO_SIGN_PUBLICKEYBYTES) {
3102              throw new SodiumException('publickey should be SODIUM_CRYPTO_SIGN_PUBLICKEYBYTES bytes');
3103          }
3104  
3105          if (self::useNewSodiumAPI()) {
3106              return sodium_crypto_sign_keypair_from_secretkey_and_publickey($sk, $pk);
3107          }
3108          return $sk . $pk;
3109      }
3110  
3111      /**
3112       * Generate an Ed25519 keypair from a seed.
3113       *
3114       * @param string $seed Input seed
3115       * @return string      Keypair
3116       * @throws SodiumException
3117       * @throws TypeError
3118       * @psalm-suppress MixedArgument
3119       */
3120      public static function crypto_sign_seed_keypair(
3121          #[\SensitiveParameter]
3122          $seed
3123      ) {
3124          ParagonIE_Sodium_Core_Util::declareScalarType($seed, 'string', 1);
3125  
3126          if (self::useNewSodiumAPI()) {
3127              return sodium_crypto_sign_seed_keypair($seed);
3128          }
3129          if (self::use_fallback('crypto_sign_keypair')) {
3130              return (string) call_user_func('\\Sodium\\crypto_sign_seed_keypair', $seed);
3131          }
3132          $publicKey = '';
3133          $secretKey = '';
3134          if (PHP_INT_SIZE === 4) {
3135              ParagonIE_Sodium_Core32_Ed25519::seed_keypair($publicKey, $secretKey, $seed);
3136          } else {
3137              ParagonIE_Sodium_Core_Ed25519::seed_keypair($publicKey, $secretKey, $seed);
3138          }
3139          return $secretKey . $publicKey;
3140      }
3141  
3142      /**
3143       * Extract an Ed25519 public key from an Ed25519 keypair.
3144       *
3145       * @param string $keypair Keypair
3146       * @return string         Public key
3147       * @throws SodiumException
3148       * @throws TypeError
3149       * @psalm-suppress MixedArgument
3150       */
3151      public static function crypto_sign_publickey(
3152          #[\SensitiveParameter]
3153          $keypair
3154      ) {
3155          /* Type checks: */
3156          ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 1);
3157  
3158          /* Input validation: */
3159          if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_SIGN_KEYPAIRBYTES) {
3160              throw new SodiumException('Argument 1 must be CRYPTO_SIGN_KEYPAIRBYTES long.');
3161          }
3162  
3163          if (self::useNewSodiumAPI()) {
3164              return sodium_crypto_sign_publickey($keypair);
3165          }
3166          if (self::use_fallback('crypto_sign_publickey')) {
3167              return (string) call_user_func('\\Sodium\\crypto_sign_publickey', $keypair);
3168          }
3169          if (PHP_INT_SIZE === 4) {
3170              return ParagonIE_Sodium_Core32_Ed25519::publickey($keypair);
3171          }
3172          return ParagonIE_Sodium_Core_Ed25519::publickey($keypair);
3173      }
3174  
3175      /**
3176       * Calculate an Ed25519 public key from an Ed25519 secret key.
3177       *
3178       * @param string $secretKey Your Ed25519 secret key
3179       * @return string           The corresponding Ed25519 public key
3180       * @throws SodiumException
3181       * @throws TypeError
3182       * @psalm-suppress MixedArgument
3183       */
3184      public static function crypto_sign_publickey_from_secretkey(
3185          #[\SensitiveParameter]
3186          $secretKey
3187      ) {
3188          /* Type checks: */
3189          ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 1);
3190  
3191          /* Input validation: */
3192          if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
3193              throw new SodiumException('Argument 1 must be CRYPTO_SIGN_SECRETKEYBYTES long.');
3194          }
3195  
3196          if (self::useNewSodiumAPI()) {
3197              return sodium_crypto_sign_publickey_from_secretkey($secretKey);
3198          }
3199          if (self::use_fallback('crypto_sign_publickey_from_secretkey')) {
3200              return (string) call_user_func('\\Sodium\\crypto_sign_publickey_from_secretkey', $secretKey);
3201          }
3202          if (PHP_INT_SIZE === 4) {
3203              return ParagonIE_Sodium_Core32_Ed25519::publickey_from_secretkey($secretKey);
3204          }
3205          return ParagonIE_Sodium_Core_Ed25519::publickey_from_secretkey($secretKey);
3206      }
3207  
3208      /**
3209       * Extract an Ed25519 secret key from an Ed25519 keypair.
3210       *
3211       * @param string $keypair Keypair
3212       * @return string         Secret key
3213       * @throws SodiumException
3214       * @throws TypeError
3215       * @psalm-suppress MixedArgument
3216       */
3217      public static function crypto_sign_secretkey(
3218          #[\SensitiveParameter]
3219          $keypair
3220      ) {
3221          /* Type checks: */
3222          ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 1);
3223  
3224          /* Input validation: */
3225          if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_SIGN_KEYPAIRBYTES) {
3226              throw new SodiumException('Argument 1 must be CRYPTO_SIGN_KEYPAIRBYTES long.');
3227          }
3228  
3229          if (self::useNewSodiumAPI()) {
3230              return sodium_crypto_sign_secretkey($keypair);
3231          }
3232          if (self::use_fallback('crypto_sign_secretkey')) {
3233              return (string) call_user_func('\\Sodium\\crypto_sign_secretkey', $keypair);
3234          }
3235          if (PHP_INT_SIZE === 4) {
3236              return ParagonIE_Sodium_Core32_Ed25519::secretkey($keypair);
3237          }
3238          return ParagonIE_Sodium_Core_Ed25519::secretkey($keypair);
3239      }
3240  
3241      /**
3242       * Calculate the Ed25519 signature of a message and return ONLY the signature.
3243       *
3244       * Algorithm: Ed25519 (EdDSA over Curve25519)
3245       *
3246       * @param string $message Message to be signed
3247       * @param string $secretKey Secret signing key
3248       * @return string           Digital signature
3249       * @throws SodiumException
3250       * @throws TypeError
3251       * @psalm-suppress MixedArgument
3252       */
3253      public static function crypto_sign_detached(
3254          $message,
3255          #[\SensitiveParameter]
3256          $secretKey
3257      ) {
3258          /* Type checks: */
3259          ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
3260          ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 2);
3261  
3262          /* Input validation: */
3263          if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
3264              throw new SodiumException('Argument 2 must be CRYPTO_SIGN_SECRETKEYBYTES long.');
3265          }
3266  
3267          if (self::useNewSodiumAPI()) {
3268              return sodium_crypto_sign_detached($message, $secretKey);
3269          }
3270          if (self::use_fallback('crypto_sign_detached')) {
3271              return (string) call_user_func('\\Sodium\\crypto_sign_detached', $message, $secretKey);
3272          }
3273          if (PHP_INT_SIZE === 4) {
3274              return ParagonIE_Sodium_Crypto32::sign_detached($message, $secretKey);
3275          }
3276          return ParagonIE_Sodium_Crypto::sign_detached($message, $secretKey);
3277      }
3278  
3279      /**
3280       * Verify the Ed25519 signature of a message.
3281       *
3282       * @param string $signature Digital sginature
3283       * @param string $message Message to be verified
3284       * @param string $publicKey Public key
3285       * @return bool             TRUE if this signature is good for this public key;
3286       *                          FALSE otherwise
3287       * @throws SodiumException
3288       * @throws TypeError
3289       * @psalm-suppress MixedArgument
3290       */
3291      public static function crypto_sign_verify_detached($signature, $message, $publicKey)
3292      {
3293          /* Type checks: */
3294          ParagonIE_Sodium_Core_Util::declareScalarType($signature, 'string', 1);
3295          ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 2);
3296          ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, 'string', 3);
3297  
3298          /* Input validation: */
3299          if (ParagonIE_Sodium_Core_Util::strlen($signature) !== self::CRYPTO_SIGN_BYTES) {
3300              throw new SodiumException('Argument 1 must be CRYPTO_SIGN_BYTES long.');
3301          }
3302          if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_SIGN_PUBLICKEYBYTES) {
3303              throw new SodiumException('Argument 3 must be CRYPTO_SIGN_PUBLICKEYBYTES long.');
3304          }
3305  
3306          if (self::useNewSodiumAPI()) {
3307              return sodium_crypto_sign_verify_detached($signature, $message, $publicKey);
3308          }
3309          if (self::use_fallback('crypto_sign_verify_detached')) {
3310              return (bool) call_user_func(
3311                  '\\Sodium\\crypto_sign_verify_detached',
3312                  $signature,
3313                  $message,
3314                  $publicKey
3315              );
3316          }
3317          if (PHP_INT_SIZE === 4) {
3318              return ParagonIE_Sodium_Crypto32::sign_verify_detached($signature, $message, $publicKey);
3319          }
3320          return ParagonIE_Sodium_Crypto::sign_verify_detached($signature, $message, $publicKey);
3321      }
3322  
3323      /**
3324       * Convert an Ed25519 public key to a Curve25519 public key
3325       *
3326       * @param string $pk
3327       * @return string
3328       * @throws SodiumException
3329       * @throws TypeError
3330       * @psalm-suppress MixedArgument
3331       */
3332      public static function crypto_sign_ed25519_pk_to_curve25519($pk)
3333      {
3334          /* Type checks: */
3335          ParagonIE_Sodium_Core_Util::declareScalarType($pk, 'string', 1);
3336  
3337          /* Input validation: */
3338          if (ParagonIE_Sodium_Core_Util::strlen($pk) < self::CRYPTO_SIGN_PUBLICKEYBYTES) {
3339              throw new SodiumException('Argument 1 must be at least CRYPTO_SIGN_PUBLICKEYBYTES long.');
3340          }
3341          if (self::useNewSodiumAPI()) {
3342              if (is_callable('crypto_sign_ed25519_pk_to_curve25519')) {
3343                  return (string) sodium_crypto_sign_ed25519_pk_to_curve25519($pk);
3344              }
3345          }
3346          if (self::use_fallback('crypto_sign_ed25519_pk_to_curve25519')) {
3347              return (string) call_user_func('\\Sodium\\crypto_sign_ed25519_pk_to_curve25519', $pk);
3348          }
3349          if (PHP_INT_SIZE === 4) {
3350              return ParagonIE_Sodium_Core32_Ed25519::pk_to_curve25519($pk);
3351          }
3352          return ParagonIE_Sodium_Core_Ed25519::pk_to_curve25519($pk);
3353      }
3354  
3355      /**
3356       * Convert an Ed25519 secret key to a Curve25519 secret key
3357       *
3358       * @param string $sk
3359       * @return string
3360       * @throws SodiumException
3361       * @throws TypeError
3362       * @psalm-suppress MixedArgument
3363       */
3364      public static function crypto_sign_ed25519_sk_to_curve25519(
3365          #[\SensitiveParameter]
3366          $sk
3367      ) {
3368          /* Type checks: */
3369          ParagonIE_Sodium_Core_Util::declareScalarType($sk, 'string', 1);
3370  
3371          /* Input validation: */
3372          if (ParagonIE_Sodium_Core_Util::strlen($sk) < self::CRYPTO_SIGN_SEEDBYTES) {
3373              throw new SodiumException('Argument 1 must be at least CRYPTO_SIGN_SEEDBYTES long.');
3374          }
3375          if (self::useNewSodiumAPI()) {
3376              if (is_callable('crypto_sign_ed25519_sk_to_curve25519')) {
3377                  return sodium_crypto_sign_ed25519_sk_to_curve25519($sk);
3378              }
3379          }
3380          if (self::use_fallback('crypto_sign_ed25519_sk_to_curve25519')) {
3381              return (string) call_user_func('\\Sodium\\crypto_sign_ed25519_sk_to_curve25519', $sk);
3382          }
3383  
3384          $h = hash('sha512', ParagonIE_Sodium_Core_Util::substr($sk, 0, 32), true);
3385          $h[0] = ParagonIE_Sodium_Core_Util::intToChr(
3386              ParagonIE_Sodium_Core_Util::chrToInt($h[0]) & 248
3387          );
3388          $h[31] = ParagonIE_Sodium_Core_Util::intToChr(
3389              (ParagonIE_Sodium_Core_Util::chrToInt($h[31]) & 127) | 64
3390          );
3391          return ParagonIE_Sodium_Core_Util::substr($h, 0, 32);
3392      }
3393  
3394      /**
3395       * Expand a key and nonce into a keystream of pseudorandom bytes.
3396       *
3397       * @param int $len Number of bytes desired
3398       * @param string $nonce Number to be used Once; must be 24 bytes
3399       * @param string $key XSalsa20 key
3400       * @return string       Pseudorandom stream that can be XORed with messages
3401       *                      to provide encryption (but not authentication; see
3402       *                      Poly1305 or crypto_auth() for that, which is not
3403       *                      optional for security)
3404       * @throws SodiumException
3405       * @throws TypeError
3406       * @psalm-suppress MixedArgument
3407       */
3408      public static function crypto_stream(
3409          $len,
3410          $nonce,
3411          #[\SensitiveParameter]
3412          $key
3413      ) {
3414          /* Type checks: */
3415          ParagonIE_Sodium_Core_Util::declareScalarType($len, 'int', 1);
3416          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
3417          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
3418  
3419          /* Input validation: */
3420          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_NONCEBYTES) {
3421              throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
3422          }
3423          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_KEYBYTES) {
3424              throw new SodiumException('Argument 3 must be CRYPTO_STREAM_KEYBYTES long.');
3425          }
3426  
3427          if (self::useNewSodiumAPI()) {
3428              return sodium_crypto_stream($len, $nonce, $key);
3429          }
3430          if (self::use_fallback('crypto_stream')) {
3431              return (string) call_user_func('\\Sodium\\crypto_stream', $len, $nonce, $key);
3432          }
3433          if (PHP_INT_SIZE === 4) {
3434              return ParagonIE_Sodium_Core32_XSalsa20::xsalsa20($len, $nonce, $key);
3435          }
3436          return ParagonIE_Sodium_Core_XSalsa20::xsalsa20($len, $nonce, $key);
3437      }
3438  
3439      /**
3440       * DANGER! UNAUTHENTICATED ENCRYPTION!
3441       *
3442       * Unless you are following expert advice, do not use this feature.
3443       *
3444       * Algorithm: XSalsa20
3445       *
3446       * This DOES NOT provide ciphertext integrity.
3447       *
3448       * @param string $message Plaintext message
3449       * @param string $nonce Number to be used Once; must be 24 bytes
3450       * @param string $key Encryption key
3451       * @return string         Encrypted text which is vulnerable to chosen-
3452       *                        ciphertext attacks unless you implement some
3453       *                        other mitigation to the ciphertext (i.e.
3454       *                        Encrypt then MAC)
3455       * @throws SodiumException
3456       * @throws TypeError
3457       * @psalm-suppress MixedArgument
3458       */
3459      public static function crypto_stream_xor(
3460          #[\SensitiveParameter]
3461          $message,
3462          $nonce,
3463          #[\SensitiveParameter]
3464          $key
3465      ) {
3466          /* Type checks: */
3467          ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
3468          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
3469          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
3470  
3471          /* Input validation: */
3472          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_NONCEBYTES) {
3473              throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
3474          }
3475          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_KEYBYTES) {
3476              throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.');
3477          }
3478  
3479          if (self::useNewSodiumAPI()) {
3480              return sodium_crypto_stream_xor($message, $nonce, $key);
3481          }
3482          if (self::use_fallback('crypto_stream_xor')) {
3483              return (string) call_user_func('\\Sodium\\crypto_stream_xor', $message, $nonce, $key);
3484          }
3485          if (PHP_INT_SIZE === 4) {
3486              return ParagonIE_Sodium_Core32_XSalsa20::xsalsa20_xor($message, $nonce, $key);
3487          }
3488          return ParagonIE_Sodium_Core_XSalsa20::xsalsa20_xor($message, $nonce, $key);
3489      }
3490  
3491      /**
3492       * Return a secure random key for use with crypto_stream
3493       *
3494       * @return string
3495       * @throws Exception
3496       * @throws Error
3497       */
3498      public static function crypto_stream_keygen()
3499      {
3500          return random_bytes(self::CRYPTO_STREAM_KEYBYTES);
3501      }
3502  
3503  
3504      /**
3505       * Expand a key and nonce into a keystream of pseudorandom bytes.
3506       *
3507       * @param int $len Number of bytes desired
3508       * @param string $nonce Number to be used Once; must be 24 bytes
3509       * @param string $key XChaCha20 key
3510       * @param bool $dontFallback
3511       * @return string       Pseudorandom stream that can be XORed with messages
3512       *                      to provide encryption (but not authentication; see
3513       *                      Poly1305 or crypto_auth() for that, which is not
3514       *                      optional for security)
3515       * @throws SodiumException
3516       * @throws TypeError
3517       * @psalm-suppress MixedArgument
3518       */
3519      public static function crypto_stream_xchacha20(
3520          $len,
3521          $nonce,
3522          #[\SensitiveParameter]
3523          $key,
3524          $dontFallback = false
3525      ) {
3526          /* Type checks: */
3527          ParagonIE_Sodium_Core_Util::declareScalarType($len, 'int', 1);
3528          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
3529          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
3530  
3531          /* Input validation: */
3532          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_XCHACHA20_NONCEBYTES) {
3533              throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_XCHACHA20_NONCEBYTES long.');
3534          }
3535          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_XCHACHA20_KEYBYTES) {
3536              throw new SodiumException('Argument 3 must be CRYPTO_STREAM_XCHACHA20_KEYBYTES long.');
3537          }
3538  
3539          if (self::useNewSodiumAPI() && !$dontFallback) {
3540              return sodium_crypto_stream_xchacha20($len, $nonce, $key);
3541          }
3542          if (PHP_INT_SIZE === 4) {
3543              return ParagonIE_Sodium_Core32_XChaCha20::stream($len, $nonce, $key);
3544          }
3545          return ParagonIE_Sodium_Core_XChaCha20::stream($len, $nonce, $key);
3546      }
3547  
3548      /**
3549       * DANGER! UNAUTHENTICATED ENCRYPTION!
3550       *
3551       * Unless you are following expert advice, do not use this feature.
3552       *
3553       * Algorithm: XChaCha20
3554       *
3555       * This DOES NOT provide ciphertext integrity.
3556       *
3557       * @param string $message Plaintext message
3558       * @param string $nonce Number to be used Once; must be 24 bytes
3559       * @param string $key Encryption key
3560       * @return string         Encrypted text which is vulnerable to chosen-
3561       *                        ciphertext attacks unless you implement some
3562       *                        other mitigation to the ciphertext (i.e.
3563       *                        Encrypt then MAC)
3564       * @param bool $dontFallback
3565       * @throws SodiumException
3566       * @throws TypeError
3567       * @psalm-suppress MixedArgument
3568       */
3569      public static function crypto_stream_xchacha20_xor(
3570          #[\SensitiveParameter]
3571          $message,
3572          $nonce,
3573          #[\SensitiveParameter]
3574          $key,
3575          $dontFallback = false
3576      ) {
3577          /* Type checks: */
3578          ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
3579          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
3580          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
3581  
3582          /* Input validation: */
3583          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_XCHACHA20_NONCEBYTES) {
3584              throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_XCHACHA20_NONCEBYTES long.');
3585          }
3586          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_XCHACHA20_KEYBYTES) {
3587              throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_XCHACHA20_KEYBYTES long.');
3588          }
3589  
3590          if (self::useNewSodiumAPI() && !$dontFallback) {
3591              return sodium_crypto_stream_xchacha20_xor($message, $nonce, $key);
3592          }
3593          if (PHP_INT_SIZE === 4) {
3594              return ParagonIE_Sodium_Core32_XChaCha20::streamXorIc($message, $nonce, $key);
3595          }
3596          return ParagonIE_Sodium_Core_XChaCha20::streamXorIc($message, $nonce, $key);
3597      }
3598  
3599      /**
3600       * DANGER! UNAUTHENTICATED ENCRYPTION!
3601       *
3602       * Unless you are following expert advice, do not use this feature.
3603       *
3604       * Algorithm: XChaCha20
3605       *
3606       * This DOES NOT provide ciphertext integrity.
3607       *
3608       * @param string $message Plaintext message
3609       * @param string $nonce Number to be used Once; must be 24 bytes
3610       * @param int $counter
3611       * @param string $key Encryption key
3612       * @return string         Encrypted text which is vulnerable to chosen-
3613       *                        ciphertext attacks unless you implement some
3614       *                        other mitigation to the ciphertext (i.e.
3615       *                        Encrypt then MAC)
3616       * @param bool $dontFallback
3617       * @throws SodiumException
3618       * @throws TypeError
3619       * @psalm-suppress MixedArgument
3620       */
3621      public static function crypto_stream_xchacha20_xor_ic(
3622          #[\SensitiveParameter]
3623          $message,
3624          $nonce,
3625          $counter,
3626          #[\SensitiveParameter]
3627          $key,
3628          $dontFallback = false
3629      ) {
3630          /* Type checks: */
3631          ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
3632          ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
3633          ParagonIE_Sodium_Core_Util::declareScalarType($counter, 'int', 3);
3634          ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
3635  
3636          /* Input validation: */
3637          if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_XCHACHA20_NONCEBYTES) {
3638              throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_XCHACHA20_NONCEBYTES long.');
3639          }
3640          if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_XCHACHA20_KEYBYTES) {
3641              throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_XCHACHA20_KEYBYTES long.');
3642          }
3643  
3644          if (is_callable('sodium_crypto_stream_xchacha20_xor_ic') && !$dontFallback) {
3645              return sodium_crypto_stream_xchacha20_xor_ic($message, $nonce, $counter, $key);
3646          }
3647  
3648          $ic = ParagonIE_Sodium_Core_Util::store64_le($counter);
3649          if (PHP_INT_SIZE === 4) {
3650              return ParagonIE_Sodium_Core32_XChaCha20::streamXorIc($message, $nonce, $key, $ic);
3651          }
3652          return ParagonIE_Sodium_Core_XChaCha20::streamXorIc($message, $nonce, $key, $ic);
3653      }
3654  
3655      /**
3656       * Return a secure random key for use with crypto_stream_xchacha20
3657       *
3658       * @return string
3659       * @throws Exception
3660       * @throws Error
3661       */
3662      public static function crypto_stream_xchacha20_keygen()
3663      {
3664          return random_bytes(self::CRYPTO_STREAM_XCHACHA20_KEYBYTES);
3665      }
3666  
3667      /**
3668       * Cache-timing-safe implementation of hex2bin().
3669       *
3670       * @param string $string Hexadecimal string
3671       * @param string $ignore List of characters to ignore; useful for whitespace
3672       * @return string        Raw binary string
3673       * @throws SodiumException
3674       * @throws TypeError
3675       * @psalm-suppress TooFewArguments
3676       * @psalm-suppress MixedArgument
3677       */
3678      public static function hex2bin(
3679          #[\SensitiveParameter]
3680          $string,
3681          $ignore = ''
3682      ) {
3683          /* Type checks: */
3684          ParagonIE_Sodium_Core_Util::declareScalarType($string, 'string', 1);
3685          ParagonIE_Sodium_Core_Util::declareScalarType($ignore, 'string', 2);
3686  
3687          if (self::useNewSodiumAPI()) {
3688              if (is_callable('sodium_hex2bin')) {
3689                  return (string) sodium_hex2bin($string, $ignore);
3690              }
3691          }
3692          if (self::use_fallback('hex2bin')) {
3693              return (string) call_user_func('\\Sodium\\hex2bin', $string, $ignore);
3694          }
3695          return ParagonIE_Sodium_Core_Util::hex2bin($string, $ignore);
3696      }
3697  
3698      /**
3699       * Increase a string (little endian)
3700       *
3701       * @param string $var
3702       *
3703       * @return void
3704       * @throws SodiumException
3705       * @throws TypeError
3706       * @psalm-suppress MixedArgument
3707       */
3708      public static function increment(
3709          #[\SensitiveParameter]
3710          &$var
3711      ) {
3712          /* Type checks: */
3713          ParagonIE_Sodium_Core_Util::declareScalarType($var, 'string', 1);
3714  
3715          if (self::useNewSodiumAPI()) {
3716              sodium_increment($var);
3717              return;
3718          }
3719          if (self::use_fallback('increment')) {
3720              $func = '\\Sodium\\increment';
3721              $func($var);
3722              return;
3723          }
3724  
3725          $len = ParagonIE_Sodium_Core_Util::strlen($var);
3726          if ($len < 1) {
3727              throw new SodiumException('Argument 1 cannot be empty');
3728          }
3729          $c = 1;
3730          $copy = '';
3731          for ($i = 0; $i < $len; ++$i) {
3732              $c += ParagonIE_Sodium_Core_Util::chrToInt(
3733                  ParagonIE_Sodium_Core_Util::substr($var, $i, 1)
3734              );
3735              $copy .= ParagonIE_Sodium_Core_Util::intToChr($c);
3736              $c >>= 8;
3737          }
3738          $var = $copy;
3739      }
3740  
3741      /**
3742       * @param string $str
3743       * @return bool
3744       *
3745       * @throws SodiumException
3746       */
3747      public static function is_zero(
3748          #[\SensitiveParameter]
3749          $str
3750      ) {
3751          $d = 0;
3752          for ($i = 0; $i < 32; ++$i) {
3753              $d |= ParagonIE_Sodium_Core_Util::chrToInt($str[$i]);
3754          }
3755          return ((($d - 1) >> 31) & 1) === 1;
3756      }
3757  
3758      /**
3759       * The equivalent to the libsodium minor version we aim to be compatible
3760       * with (sans pwhash and memzero).
3761       *
3762       * @return int
3763       */
3764      public static function library_version_major()
3765      {
3766          if (self::useNewSodiumAPI() && defined('SODIUM_LIBRARY_MAJOR_VERSION')) {
3767              return SODIUM_LIBRARY_MAJOR_VERSION;
3768          }
3769          if (self::use_fallback('library_version_major')) {
3770              /** @psalm-suppress UndefinedFunction */
3771              return (int) call_user_func('\\Sodium\\library_version_major');
3772          }
3773          return self::LIBRARY_VERSION_MAJOR;
3774      }
3775  
3776      /**
3777       * The equivalent to the libsodium minor version we aim to be compatible
3778       * with (sans pwhash and memzero).
3779       *
3780       * @return int
3781       */
3782      public static function library_version_minor()
3783      {
3784          if (self::useNewSodiumAPI() && defined('SODIUM_LIBRARY_MINOR_VERSION')) {
3785              return SODIUM_LIBRARY_MINOR_VERSION;
3786          }
3787          if (self::use_fallback('library_version_minor')) {
3788              /** @psalm-suppress UndefinedFunction */
3789              return (int) call_user_func('\\Sodium\\library_version_minor');
3790          }
3791          return self::LIBRARY_VERSION_MINOR;
3792      }
3793  
3794      /**
3795       * Compare two strings.
3796       *
3797       * @param string $left
3798       * @param string $right
3799       * @return int
3800       * @throws SodiumException
3801       * @throws TypeError
3802       * @psalm-suppress MixedArgument
3803       */
3804      public static function memcmp(
3805          #[\SensitiveParameter]
3806          $left,
3807          #[\SensitiveParameter]
3808          $right
3809      ) {
3810          /* Type checks: */
3811          ParagonIE_Sodium_Core_Util::declareScalarType($left, 'string', 1);
3812          ParagonIE_Sodium_Core_Util::declareScalarType($right, 'string', 2);
3813  
3814          if (self::useNewSodiumAPI()) {
3815              return sodium_memcmp($left, $right);
3816          }
3817          if (self::use_fallback('memcmp')) {
3818              return (int) call_user_func('\\Sodium\\memcmp', $left, $right);
3819          }
3820          /** @var string $left */
3821          /** @var string $right */
3822          return ParagonIE_Sodium_Core_Util::memcmp($left, $right);
3823      }
3824  
3825      /**
3826       * It's actually not possible to zero memory buffers in PHP. You need the
3827       * native library for that.
3828       *
3829       * @param string|null $var
3830       * @param-out string|null $var
3831       *
3832       * @return void
3833       * @throws SodiumException (Unless libsodium is installed)
3834       * @throws TypeError
3835       * @psalm-suppress TooFewArguments
3836       */
3837      public static function memzero(
3838          #[\SensitiveParameter]
3839          &$var
3840      ) {
3841          /* Type checks: */
3842          ParagonIE_Sodium_Core_Util::declareScalarType($var, 'string', 1);
3843  
3844          if (self::useNewSodiumAPI()) {
3845              /** @psalm-suppress MixedArgument */
3846              sodium_memzero($var);
3847              return;
3848          }
3849          if (self::use_fallback('memzero')) {
3850              $func = '\\Sodium\\memzero';
3851              $func($var);
3852              if ($var === null) {
3853                  return;
3854              }
3855          }
3856          // This is the best we can do.
3857          throw new SodiumException(
3858              'This is not implemented in sodium_compat, as it is not possible to securely wipe memory from PHP. ' .
3859              'To fix this error, make sure libsodium is installed and the PHP extension is enabled.'
3860          );
3861      }
3862  
3863      /**
3864       * @param string $unpadded
3865       * @param int $blockSize
3866       * @param bool $dontFallback
3867       * @return string
3868       * @throws SodiumException
3869       */
3870      public static function pad(
3871          #[\SensitiveParameter]
3872          $unpadded,
3873          $blockSize,
3874          $dontFallback = false
3875      ) {
3876          /* Type checks: */
3877          ParagonIE_Sodium_Core_Util::declareScalarType($unpadded, 'string', 1);
3878          ParagonIE_Sodium_Core_Util::declareScalarType($blockSize, 'int', 2);
3879  
3880          $unpadded = (string) $unpadded;
3881          $blockSize = (int) $blockSize;
3882  
3883          if (self::useNewSodiumAPI() && !$dontFallback) {
3884              return (string) sodium_pad($unpadded, $blockSize);
3885          }
3886  
3887          if ($blockSize <= 0) {
3888              throw new SodiumException(
3889                  'block size cannot be less than 1'
3890              );
3891          }
3892          $unpadded_len = ParagonIE_Sodium_Core_Util::strlen($unpadded);
3893          $xpadlen = ($blockSize - 1);
3894          if (($blockSize & ($blockSize - 1)) === 0) {
3895              $xpadlen -= $unpadded_len & ($blockSize - 1);
3896          } else {
3897              $xpadlen -= $unpadded_len % $blockSize;
3898          }
3899  
3900          $xpadded_len = $unpadded_len + $xpadlen;
3901          $padded = str_repeat("\0", $xpadded_len - 1);
3902          if ($unpadded_len > 0) {
3903              $st = 1;
3904              $i = 0;
3905              $k = $unpadded_len;
3906              for ($j = 0; $j <= $xpadded_len; ++$j) {
3907                  $i = (int) $i;
3908                  $k = (int) $k;
3909                  $st = (int) $st;
3910                  if ($j >= $unpadded_len) {
3911                      $padded[$j] = "\0";
3912                  } else {
3913                      $padded[$j] = $unpadded[$j];
3914                  }
3915                  /** @var int $k */
3916                  $k -= $st;
3917                  $st = (int) (~(
3918                              (
3919                                  (
3920                                      ($k >> 48)
3921                                          |
3922                                      ($k >> 32)
3923                                          |
3924                                      ($k >> 16)
3925                                          |
3926                                      $k
3927                                  ) - 1
3928                              ) >> 16
3929                          )
3930                      ) & 1;
3931                  $i += $st;
3932              }
3933          }
3934  
3935          $mask = 0;
3936          $tail = $xpadded_len;
3937          for ($i = 0; $i < $blockSize; ++$i) {
3938              # barrier_mask = (unsigned char)
3939              #     (((i ^ xpadlen) - 1U) >> ((sizeof(size_t) - 1U) * CHAR_BIT));
3940              $barrier_mask = (($i ^ $xpadlen) -1) >> ((PHP_INT_SIZE << 3) - 1);
3941              # tail[-i] = (tail[-i] & mask) | (0x80 & barrier_mask);
3942              $padded[$tail - $i] = ParagonIE_Sodium_Core_Util::intToChr(
3943                  (ParagonIE_Sodium_Core_Util::chrToInt($padded[$tail - $i]) & $mask)
3944                      |
3945                  (0x80 & $barrier_mask)
3946              );
3947              # mask |= barrier_mask;
3948              $mask |= $barrier_mask;
3949          }
3950          return $padded;
3951      }
3952  
3953      /**
3954       * @param string $padded
3955       * @param int $blockSize
3956       * @param bool $dontFallback
3957       * @return string
3958       * @throws SodiumException
3959       */
3960      public static function unpad(
3961          #[\SensitiveParameter]
3962          $padded,
3963          $blockSize,
3964          $dontFallback = false
3965      ) {
3966          /* Type checks: */
3967          ParagonIE_Sodium_Core_Util::declareScalarType($padded, 'string', 1);
3968          ParagonIE_Sodium_Core_Util::declareScalarType($blockSize, 'int', 2);
3969  
3970          $padded = (string) $padded;
3971          $blockSize = (int) $blockSize;
3972  
3973          if (self::useNewSodiumAPI() && !$dontFallback) {
3974              return (string) sodium_unpad($padded, $blockSize);
3975          }
3976          if ($blockSize <= 0) {
3977              throw new SodiumException('block size cannot be less than 1');
3978          }
3979          $padded_len = ParagonIE_Sodium_Core_Util::strlen($padded);
3980          if ($padded_len < $blockSize) {
3981              throw new SodiumException('invalid padding');
3982          }
3983  
3984          # tail = &padded[padded_len - 1U];
3985          $tail = $padded_len - 1;
3986  
3987          $acc = 0;
3988          $valid = 0;
3989          $pad_len = 0;
3990  
3991          $found = 0;
3992          for ($i = 0; $i < $blockSize; ++$i) {
3993              # c = tail[-i];
3994              $c = ParagonIE_Sodium_Core_Util::chrToInt($padded[$tail - $i]);
3995  
3996              # is_barrier =
3997              #     (( (acc - 1U) & (pad_len - 1U) & ((c ^ 0x80) - 1U) ) >> 8) & 1U;
3998              $is_barrier = (
3999                  (
4000                      ($acc - 1) & ($pad_len - 1) & (($c ^ 80) - 1)
4001                  ) >> 7
4002              ) & 1;
4003              $is_barrier &= ~$found;
4004              $found |= $is_barrier;
4005  
4006              # acc |= c;
4007              $acc |= $c;
4008  
4009              # pad_len |= i & (1U + ~is_barrier);
4010              $pad_len |= $i & (1 + ~$is_barrier);
4011  
4012              # valid |= (unsigned char) is_barrier;
4013              $valid |= ($is_barrier & 0xff);
4014          }
4015          # unpadded_len = padded_len - 1U - pad_len;
4016          $unpadded_len = $padded_len - 1 - $pad_len;
4017          if ($valid !== 1) {
4018              throw new SodiumException('invalid padding');
4019          }
4020          return ParagonIE_Sodium_Core_Util::substr($padded, 0, $unpadded_len);
4021      }
4022  
4023      /**
4024       * Will sodium_compat run fast on the current hardware and PHP configuration?
4025       *
4026       * @return bool
4027       */
4028      public static function polyfill_is_fast()
4029      {
4030          if (extension_loaded('sodium')) {
4031              return true;
4032          }
4033          if (extension_loaded('libsodium')) {
4034              return true;
4035          }
4036          return PHP_INT_SIZE === 8;
4037      }
4038  
4039      /**
4040       * Generate a string of bytes from the kernel's CSPRNG.
4041       * Proudly uses /dev/urandom (if getrandom(2) is not available).
4042       *
4043       * @param int $numBytes
4044       * @return string
4045       * @throws Exception
4046       * @throws TypeError
4047       */
4048      public static function randombytes_buf($numBytes)
4049      {
4050          /* Type checks: */
4051          if (!is_int($numBytes)) {
4052              if (is_numeric($numBytes)) {
4053                  $numBytes = (int) $numBytes;
4054              } else {
4055                  throw new TypeError(
4056                      'Argument 1 must be an integer, ' . gettype($numBytes) . ' given.'
4057                  );
4058              }
4059          }
4060          /** @var positive-int $numBytes */
4061          if (self::use_fallback('randombytes_buf')) {
4062              return (string) call_user_func('\\Sodium\\randombytes_buf', $numBytes);
4063          }
4064          if ($numBytes < 0) {
4065              throw new SodiumException("Number of bytes must be a positive integer");
4066          }
4067          return random_bytes($numBytes);
4068      }
4069  
4070      /**
4071       * Generate an integer between 0 and $range (non-inclusive).
4072       *
4073       * @param int $range
4074       * @return int
4075       * @throws Exception
4076       * @throws Error
4077       * @throws TypeError
4078       */
4079      public static function randombytes_uniform($range)
4080      {
4081          /* Type checks: */
4082          if (!is_int($range)) {
4083              if (is_numeric($range)) {
4084                  $range = (int) $range;
4085              } else {
4086                  throw new TypeError(
4087                      'Argument 1 must be an integer, ' . gettype($range) . ' given.'
4088                  );
4089              }
4090          }
4091          if (self::use_fallback('randombytes_uniform')) {
4092              return (int) call_user_func('\\Sodium\\randombytes_uniform', $range);
4093          }
4094          return random_int(0, $range - 1);
4095      }
4096  
4097      /**
4098       * Generate a random 16-bit integer.
4099       *
4100       * @return int
4101       * @throws Exception
4102       * @throws Error
4103       * @throws TypeError
4104       */
4105      public static function randombytes_random16()
4106      {
4107          if (self::use_fallback('randombytes_random16')) {
4108              return (int) call_user_func('\\Sodium\\randombytes_random16');
4109          }
4110          return random_int(0, 65535);
4111      }
4112  
4113      /**
4114       * @param string $p
4115       * @param bool $dontFallback
4116       * @return bool
4117       * @throws SodiumException
4118       */
4119      public static function ristretto255_is_valid_point(
4120          #[\SensitiveParameter]
4121          $p,
4122          $dontFallback = false
4123      ) {
4124          if (self::useNewSodiumAPI() && !$dontFallback) {
4125              return sodium_crypto_core_ristretto255_is_valid_point($p);
4126          }
4127          try {
4128              $r = ParagonIE_Sodium_Core_Ristretto255::ristretto255_frombytes($p);
4129              return $r['res'] === 0 &&
4130                  ParagonIE_Sodium_Core_Ristretto255::ristretto255_point_is_canonical($p) === 1;
4131          } catch (SodiumException $ex) {
4132              if ($ex->getMessage() === 'S is not canonical') {
4133                  return false;
4134              }
4135              throw $ex;
4136          }
4137      }
4138  
4139      /**
4140       * @param string $p
4141       * @param string $q
4142       * @param bool $dontFallback
4143       * @return string
4144       * @throws SodiumException
4145       */
4146      public static function ristretto255_add(
4147          #[\SensitiveParameter]
4148          $p,
4149          #[\SensitiveParameter]
4150          $q,
4151          $dontFallback = false
4152      ) {
4153          if (self::useNewSodiumAPI() && !$dontFallback) {
4154              return sodium_crypto_core_ristretto255_add($p, $q);
4155          }
4156          return ParagonIE_Sodium_Core_Ristretto255::ristretto255_add($p, $q);
4157      }
4158  
4159      /**
4160       * @param string $p
4161       * @param string $q
4162       * @param bool $dontFallback
4163       * @return string
4164       * @throws SodiumException
4165       */
4166      public static function ristretto255_sub(
4167          #[\SensitiveParameter]
4168          $p,
4169          #[\SensitiveParameter]
4170          $q,
4171          $dontFallback = false
4172      ) {
4173          if (self::useNewSodiumAPI() && !$dontFallback) {
4174              return sodium_crypto_core_ristretto255_sub($p, $q);
4175          }
4176          return ParagonIE_Sodium_Core_Ristretto255::ristretto255_sub($p, $q);
4177      }
4178  
4179      /**
4180       * @param string $r
4181       * @param bool $dontFallback
4182       * @return string
4183       *
4184       * @throws SodiumException
4185       */
4186      public static function ristretto255_from_hash(
4187          #[\SensitiveParameter]
4188          $r,
4189          $dontFallback = false
4190      ) {
4191          if (self::useNewSodiumAPI() && !$dontFallback) {
4192              return sodium_crypto_core_ristretto255_from_hash($r);
4193          }
4194          return ParagonIE_Sodium_Core_Ristretto255::ristretto255_from_hash($r);
4195      }
4196  
4197      /**
4198       * @param bool $dontFallback
4199       * @return string
4200       *
4201       * @throws SodiumException
4202       */
4203      public static function ristretto255_random($dontFallback = false)
4204      {
4205          if (self::useNewSodiumAPI() && !$dontFallback) {
4206              return sodium_crypto_core_ristretto255_random();
4207          }
4208          return ParagonIE_Sodium_Core_Ristretto255::ristretto255_random();
4209      }
4210  
4211      /**
4212       * @param bool $dontFallback
4213       * @return string
4214       *
4215       * @throws SodiumException
4216       */
4217      public static function ristretto255_scalar_random($dontFallback = false)
4218      {
4219          if (self::useNewSodiumAPI() && !$dontFallback) {
4220              return sodium_crypto_core_ristretto255_scalar_random();
4221          }
4222          return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_random();
4223      }
4224  
4225      /**
4226       * @param string $s
4227       * @param bool $dontFallback
4228       * @return string
4229       * @throws SodiumException
4230       */
4231      public static function ristretto255_scalar_invert(
4232          #[\SensitiveParameter]
4233          $s,
4234          $dontFallback = false
4235      ) {
4236          if (self::useNewSodiumAPI() && !$dontFallback) {
4237              return sodium_crypto_core_ristretto255_scalar_invert($s);
4238          }
4239          return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_invert($s);
4240      }
4241      /**
4242       * @param string $s
4243       * @param bool $dontFallback
4244       * @return string
4245       * @throws SodiumException
4246       */
4247      public static function ristretto255_scalar_negate(
4248          #[\SensitiveParameter]
4249          $s,
4250          $dontFallback = false
4251      ) {
4252          if (self::useNewSodiumAPI() && !$dontFallback) {
4253              return sodium_crypto_core_ristretto255_scalar_negate($s);
4254          }
4255          return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_negate($s);
4256      }
4257  
4258      /**
4259       * @param string $s
4260       * @param bool $dontFallback
4261       * @return string
4262       * @throws SodiumException
4263       */
4264      public static function ristretto255_scalar_complement(
4265          #[\SensitiveParameter]
4266          $s,
4267          $dontFallback = false
4268      ) {
4269          if (self::useNewSodiumAPI() && !$dontFallback) {
4270              return sodium_crypto_core_ristretto255_scalar_complement($s);
4271          }
4272          return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_complement($s);
4273      }
4274  
4275      /**
4276       * @param string $x
4277       * @param string $y
4278       * @param bool $dontFallback
4279       * @return string
4280       * @throws SodiumException
4281       */
4282      public static function ristretto255_scalar_add(
4283          #[\SensitiveParameter]
4284          $x,
4285          #[\SensitiveParameter]
4286          $y,
4287          $dontFallback = false
4288      ) {
4289          if (self::useNewSodiumAPI() && !$dontFallback) {
4290              return sodium_crypto_core_ristretto255_scalar_add($x, $y);
4291          }
4292          return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_add($x, $y);
4293      }
4294  
4295      /**
4296       * @param string $x
4297       * @param string $y
4298       * @param bool $dontFallback
4299       * @return string
4300       * @throws SodiumException
4301       */
4302      public static function ristretto255_scalar_sub(
4303          #[\SensitiveParameter]
4304          $x,
4305          #[\SensitiveParameter]
4306          $y,
4307          $dontFallback = false
4308      ) {
4309          if (self::useNewSodiumAPI() && !$dontFallback) {
4310              return sodium_crypto_core_ristretto255_scalar_sub($x, $y);
4311          }
4312          return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_sub($x, $y);
4313      }
4314  
4315      /**
4316       * @param string $x
4317       * @param string $y
4318       * @param bool $dontFallback
4319       * @return string
4320       * @throws SodiumException
4321       */
4322      public static function ristretto255_scalar_mul(
4323          #[\SensitiveParameter]
4324          $x,
4325          #[\SensitiveParameter]
4326          $y,
4327          $dontFallback = false
4328      ) {
4329          if (self::useNewSodiumAPI() && !$dontFallback) {
4330              return sodium_crypto_core_ristretto255_scalar_mul($x, $y);
4331          }
4332          return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_mul($x, $y);
4333      }
4334  
4335      /**
4336       * @param string $n
4337       * @param string $p
4338       * @param bool $dontFallback
4339       * @return string
4340       * @throws SodiumException
4341       */
4342      public static function scalarmult_ristretto255(
4343          #[\SensitiveParameter]
4344          $n,
4345          #[\SensitiveParameter]
4346          $p,
4347          $dontFallback = false
4348      ) {
4349          if (self::useNewSodiumAPI() && !$dontFallback) {
4350              return sodium_crypto_scalarmult_ristretto255($n, $p);
4351          }
4352          return ParagonIE_Sodium_Core_Ristretto255::scalarmult_ristretto255($n, $p);
4353      }
4354  
4355      /**
4356       * @param string $n
4357       * @param string $p
4358       * @param bool $dontFallback
4359       * @return string
4360       * @throws SodiumException
4361       */
4362      public static function scalarmult_ristretto255_base(
4363          #[\SensitiveParameter]
4364          $n,
4365          $dontFallback = false
4366      ) {
4367          if (self::useNewSodiumAPI() && !$dontFallback) {
4368              return sodium_crypto_scalarmult_ristretto255_base($n);
4369          }
4370          return ParagonIE_Sodium_Core_Ristretto255::scalarmult_ristretto255_base($n);
4371      }
4372  
4373      /**
4374       * @param string $s
4375       * @param bool $dontFallback
4376       * @return string
4377       * @throws SodiumException
4378       */
4379      public static function ristretto255_scalar_reduce(
4380          #[\SensitiveParameter]
4381          $s,
4382          $dontFallback = false
4383      ) {
4384          if (self::useNewSodiumAPI() && !$dontFallback) {
4385              return sodium_crypto_core_ristretto255_scalar_reduce($s);
4386          }
4387          return ParagonIE_Sodium_Core_Ristretto255::sc_reduce($s);
4388      }
4389  
4390      /**
4391       * Runtime testing method for 32-bit platforms.
4392       *
4393       * Usage: If runtime_speed_test() returns FALSE, then our 32-bit
4394       *        implementation is to slow to use safely without risking timeouts.
4395       *        If this happens, install sodium from PECL to get acceptable
4396       *        performance.
4397       *
4398       * @param int $iterations Number of multiplications to attempt
4399       * @param int $maxTimeout Milliseconds
4400       * @return bool           TRUE if we're fast enough, FALSE is not
4401       * @throws SodiumException
4402       */
4403      public static function runtime_speed_test($iterations, $maxTimeout)
4404      {
4405          if (self::polyfill_is_fast()) {
4406              return true;
4407          }
4408          /** @var float $end */
4409          $end = 0.0;
4410          /** @var float $start */
4411          $start = microtime(true);
4412          /** @var ParagonIE_Sodium_Core32_Int64 $a */
4413          $a = ParagonIE_Sodium_Core32_Int64::fromInt(random_int(3, 1 << 16));
4414          for ($i = 0; $i < $iterations; ++$i) {
4415              /** @var ParagonIE_Sodium_Core32_Int64 $b */
4416              $b = ParagonIE_Sodium_Core32_Int64::fromInt(random_int(3, 1 << 16));
4417              $a->mulInt64($b);
4418          }
4419          /** @var float $end */
4420          $end = microtime(true);
4421          /** @var int $diff */
4422          $diff = (int) ceil(($end - $start) * 1000);
4423          return $diff < $maxTimeout;
4424      }
4425  
4426      /**
4427       * Add two numbers (little-endian unsigned), storing the value in the first
4428       * parameter.
4429       *
4430       * This mutates $val.
4431       *
4432       * @param string $val
4433       * @param string $addv
4434       * @return void
4435       * @throws SodiumException
4436       */
4437      public static function sub(
4438          #[\SensitiveParameter]
4439          &$val,
4440          #[\SensitiveParameter]
4441          $addv
4442      ) {
4443          $val_len = ParagonIE_Sodium_Core_Util::strlen($val);
4444          $addv_len = ParagonIE_Sodium_Core_Util::strlen($addv);
4445          if ($val_len !== $addv_len) {
4446              throw new SodiumException('values must have the same length');
4447          }
4448          $A = ParagonIE_Sodium_Core_Util::stringToIntArray($val);
4449          $B = ParagonIE_Sodium_Core_Util::stringToIntArray($addv);
4450  
4451          $c = 0;
4452          for ($i = 0; $i < $val_len; $i++) {
4453              $c = ($A[$i] - $B[$i] - $c);
4454              $A[$i] = ($c & 0xff);
4455              $c = ($c >> 8) & 1;
4456          }
4457          $val = ParagonIE_Sodium_Core_Util::intArrayToString($A);
4458      }
4459  
4460      /**
4461       * This emulates libsodium's version_string() function, except ours is
4462       * prefixed with 'polyfill-'.
4463       *
4464       * @return string
4465       * @psalm-suppress MixedInferredReturnType
4466       * @psalm-suppress UndefinedFunction
4467       */
4468      public static function version_string()
4469      {
4470          if (self::useNewSodiumAPI()) {
4471              return (string) sodium_version_string();
4472          }
4473          if (self::use_fallback('version_string')) {
4474              return (string) call_user_func('\\Sodium\\version_string');
4475          }
4476          return (string) self::VERSION_STRING;
4477      }
4478  
4479      /**
4480       * Should we use the libsodium core function instead?
4481       * This is always a good idea, if it's available. (Unless we're in the
4482       * middle of running our unit test suite.)
4483       *
4484       * If ext/libsodium is available, use it. Return TRUE.
4485       * Otherwise, we have to use the code provided herein. Return FALSE.
4486       *
4487       * @param string $sodium_func_name
4488       *
4489       * @return bool
4490       */
4491      protected static function use_fallback($sodium_func_name = '')
4492      {
4493          static $res = null;
4494          if ($res === null) {
4495              $res = extension_loaded('libsodium') && PHP_VERSION_ID >= 50300;
4496          }
4497          if ($res === false) {
4498              // No libsodium installed
4499              return false;
4500          }
4501          if (self::$disableFallbackForUnitTests) {
4502              // Don't fallback. Use the PHP implementation.
4503              return false;
4504          }
4505          if (!empty($sodium_func_name)) {
4506              return is_callable('\\Sodium\\' . $sodium_func_name);
4507          }
4508          return true;
4509      }
4510  
4511      /**
4512       * Libsodium as implemented in PHP 7.2
4513       * and/or ext/sodium (via PECL)
4514       *
4515       * @ref https://wiki.php.net/rfc/libsodium
4516       * @return bool
4517       */
4518      protected static function useNewSodiumAPI()
4519      {
4520          static $res = null;
4521          if ($res === null) {
4522              $res = PHP_VERSION_ID >= 70000 && extension_loaded('sodium');
4523          }
4524          if (self::$disableFallbackForUnitTests) {
4525              // Don't fallback. Use the PHP implementation.
4526              return false;
4527          }
4528          return (bool) $res;
4529      }
4530  }


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