mini-blog /library/Zend/Crypt/Hmac.php

Language PHP Lines 181
MD5 Hash e338be362202b48686aee8e736caa1d4 Estimated Cost $1,532 (why?)
Repository https://bitbucket.org/luizbrandaoj/mini-blog.git View Raw File View Project SPDX
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Crypt
 * @subpackage Hmac
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Hmac.php 23775 2011-03-01 17:25:24Z ralph $
 */

/**
 * @see Zend_Crypt
 */
require_once 'Zend/Crypt.php';

/**
 * PHP implementation of the RFC 2104 Hash based Message Authentication Code
 * algorithm.
 *
 * @todo  Patch for refactoring failed tests (key block sizes >80 using internal algo)
 * @todo       Check if mhash() is a required alternative (will be PECL-only soon)
 * @category   Zend
 * @package    Zend_Crypt
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Crypt_Hmac extends Zend_Crypt
{

    /**
     * The key to use for the hash
     *
     * @var string
     */
    protected static $_key = null;

    /**
     * pack() format to be used for current hashing method
     *
     * @var string
     */
    protected static $_packFormat = null;

    /**
     * Hashing algorithm; can be the md5/sha1 functions or any algorithm name
     * listed in the output of PHP 5.1.2+ hash_algos().
     *
     * @var string
     */
    protected static $_hashAlgorithm = 'md5';

    /**
     * List of algorithms supported my mhash()
     *
     * @var array
     */
    protected static $_supportedMhashAlgorithms = array('adler32',' crc32', 'crc32b', 'gost',
            'haval128', 'haval160', 'haval192', 'haval256', 'md4', 'md5', 'ripemd160',
            'sha1', 'sha256', 'tiger', 'tiger128', 'tiger160');

    /**
     * Constants representing the output mode of the hash algorithm
     */
    const STRING = 'string';
    const BINARY = 'binary';

    /**
     * Performs a HMAC computation given relevant details such as Key, Hashing
     * algorithm, the data to compute MAC of, and an output format of String,
     * Binary notation or BTWOC.
     *
     * @param string $key
     * @param string $hash
     * @param string $data
     * @param string $output
     * @param boolean $internal
     * @return string
     */
    public static function compute($key, $hash, $data, $output = self::STRING)
    {
        // set the key
        if (!isset($key) || empty($key)) {
            require_once 'Zend/Crypt/Hmac/Exception.php';
            throw new Zend_Crypt_Hmac_Exception('provided key is null or empty');
        }
        self::$_key = $key;

        // set the hash
        self::_setHashAlgorithm($hash);

        // perform hashing and return
        return self::_hash($data, $output);
    }

    /**
     * Setter for the hash method.
     *
     * @param string $hash
     * @return Zend_Crypt_Hmac
     */
    protected static function _setHashAlgorithm($hash)
    {
        if (!isset($hash) || empty($hash)) {
            require_once 'Zend/Crypt/Hmac/Exception.php';
            throw new Zend_Crypt_Hmac_Exception('provided hash string is null or empty');
        }

        $hash = strtolower($hash);
        $hashSupported = false;

        if (function_exists('hash_algos') && in_array($hash, hash_algos())) {
            $hashSupported = true;
        }

        if ($hashSupported === false && function_exists('mhash') && in_array($hash, self::$_supportedAlgosMhash)) {
            $hashSupported = true;
        }

        if ($hashSupported === false) {
            require_once 'Zend/Crypt/Hmac/Exception.php';
            throw new Zend_Crypt_Hmac_Exception('hash algorithm provided is not supported on this PHP installation; please enable the hash or mhash extensions');
        }
        self::$_hashAlgorithm = $hash;
    }

    /**
     * Perform HMAC and return the keyed data
     *
     * @param string $data
     * @param string $output
     * @param bool $internal Option to not use hash() functions for testing
     * @return string
     */
    protected static function _hash($data, $output = self::STRING, $internal = false)
    {
        if (function_exists('hash_hmac')) {
            if ($output == self::BINARY) {
                return hash_hmac(self::$_hashAlgorithm, $data, self::$_key, 1);
            }
            return hash_hmac(self::$_hashAlgorithm, $data, self::$_key);
        }

        if (function_exists('mhash')) {
            if ($output == self::BINARY) {
                return mhash(self::_getMhashDefinition(self::$_hashAlgorithm), $data, self::$_key);
            }
            $bin = mhash(self::_getMhashDefinition(self::$_hashAlgorithm), $data, self::$_key);
            return bin2hex($bin);
        }
    }

    /**
     * Since MHASH accepts an integer constant representing the hash algorithm
     * we need to make a small detour to get the correct integer matching our
     * algorithm's name.
     *
     * @param string $hashAlgorithm
     * @return integer
     */
    protected static function _getMhashDefinition($hashAlgorithm)
    {
        for ($i = 0; $i <= mhash_count(); $i++)
        {
            $types[mhash_get_hash_name($i)] = $i;
        }
        return $types[strtoupper($hashAlgorithm)];
    }

}
Back to Top