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