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_hash_hmac ›

Since3.2.0
Deprecatedn/a
_hash_hmac ( $algo, $data, $key, $raw_output = false )
Parameters: (4)
  • (string) $algo Hash algorithm. Accepts 'md5' or 'sha1'.
    Required: Yes
  • (string) $data Data to be hashed.
    Required: Yes
  • (string) $key Secret key to use for generating the hash.
    Required: Yes
  • (bool) $raw_output Optional. Whether to output raw binary data (true), or lowercase hexits (false). Default false.
    Required: No
    Default: false
Returns:
  • (string|false) The hash in output determined by `$raw_output`. False if `$algo` is unknown or invalid.
Defined at:
Codex:

Internal compat function to mimic hash_hmac().



Source

function _hash_hmac( $algo, $data, $key, $raw_output = false ) {
	$packs = array(
		'md5'  => 'H32',
		'sha1' => 'H40',
	);

	if ( ! isset( $packs[ $algo ] ) ) {
		return false;
	}

	$pack = $packs[ $algo ];

	if ( strlen( $key ) > 64 ) {
		$key = pack( $pack, $algo( $key ) );
	}

	$key = str_pad( $key, 64, chr( 0 ) );

	$ipad = ( substr( $key, 0, 64 ) ^ str_repeat( chr( 0x36 ), 64 ) );
	$opad = ( substr( $key, 0, 64 ) ^ str_repeat( chr( 0x5C ), 64 ) );

	$hmac = $algo( $opad . pack( $pack, $algo( $ipad . $data ) ) );

	if ( $raw_output ) {
		return pack( $pack, $hmac );
	}
	return $hmac;
}