nextcloud/apps/files_external/3rdparty/aws-sdk-php/Aws/Common/Hash/HashUtils.php

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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 Aws\Common\Hash;
use 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) {
$useNative = function_exists('hex2bin');
}
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if (!$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;
}
}