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<?php /** * Copyright 2010-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"). * You may not use this file except in compliance with the License. * A copy of the License is located at * * http://aws.amazon.com/apache2.0 * * or in the "license" file accompanying this file. This file is distributed * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either * express or implied. See the License for the specific language governing * permissions and limitations under the License. */ namespace DuplicatorPro\Aws\Common\Hash; use DuplicatorPro\Aws\Common\Exception\InvalidArgumentException; /** * Contains hashing utilities */ class HashUtils { /** * Converts a hash in hex form to binary form * * @param string $hash Hash in hex form * * @return string Hash in binary form */ public static function hexToBin($hash) { // If using PHP 5.4, there is a native function to convert from hex to binary static $useNative; if ($useNative === null) { $useNative = function_exists('hex2bin'); } if (!$useNative && strlen($hash) % 2 !== 0) { $hash = '0' . $hash; } return $useNative ? hex2bin($hash) : pack("H*", $hash); } /** * Converts a hash in binary form to hex form * * @param string $hash Hash in binary form * * @return string Hash in hex form */ public static function binToHex($hash) { return bin2hex($hash); } /** * Checks if the algorithm specified exists and throws an exception if it does not * * @param string $algorithm Name of the algorithm to validate * * @return bool * @throws InvalidArgumentException if the algorithm doesn't exist */ public static function validateAlgorithm($algorithm) { if (!in_array($algorithm, hash_algos(), true)) { throw new InvalidArgumentException("The hashing algorithm specified ({$algorithm}) does not exist."); } return true; } }