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<?php /** * Utility functions for generating hashes * * This is based in part on Drupal code as well as what we used in our own code * prior to introduction of this class, by way of MWCryptRand. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file */ class MWCryptHash { /** * The hash algorithm being used */ protected static ?string $algo = null; /** * The number of bytes outputted by the hash algorithm */ protected static int $hashLength; /** * Decide on the best acceptable hash algorithm we have available for hash() * @return string A hash algorithm */ public static function hashAlgo() { $algorithm = self::$algo; if ( $algorithm !== null ) { return $algorithm; } $algos = hash_hmac_algos(); $preference = [ 'whirlpool', 'sha256' ]; foreach ( $preference as $algorithm ) { if ( in_array( $algorithm, $algos, true ) ) { self::$algo = $algorithm; return $algorithm; } } throw new DomainException( 'Could not find an acceptable hashing function.' ); } /** * Return the byte-length output of the hash algorithm we are * using in self::hash and self::hmac. * * @param bool $raw True to return the length for binary data, false to * return for hex-encoded * @return int Number of bytes the hash outputs */ public static function hashLength( $raw = true ) { self::$hashLength ??= strlen( self::hash( '', true ) ); // Optimisation: Skip computing the length of non-raw hashes. // The algos in hashAlgo() all produce a digest that is a multiple // of 8 bits, where hex is always twice the length of binary byte length. return $raw ? self::$hashLength : self::$hashLength * 2; } /** * Generate a cryptographic hash value (message digest) for a string, * making use of the best hash algorithm that we have available. * * @param string $data * @param bool $raw True to return binary data, false to return it hex-encoded * @return string A hash of the data */ public static function hash( $data, $raw = true ) { return hash( self::hashAlgo(), $data, $raw ); } /** * Generate a keyed cryptographic hash value (HMAC) for a string, * making use of the best hash algorithm that we have available. * * @param string $data * @param string $key * @param bool $raw True to return binary data, false to return it hex-encoded * @return string An HMAC hash of the data + key */ public static function hmac( $data, $key, $raw = true ) { if ( !is_string( $key ) ) { // hash_hmac tolerates non-string (would return null with warning) throw new InvalidArgumentException( 'Invalid key type: ' . get_debug_type( $key ) ); } return hash_hmac( self::hashAlgo(), $data, $key, $raw ); } }
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