mirror of
https://github.com/danog/tgseclib.git
synced 2024-12-16 02:46:57 +01:00
b4cf10fc94
This reverts commit be5f4ef6b19c82f6c898708cc8e1828b05e3d4e8, reversing
changes made to 638fe6971c.
463 lines
15 KiB
PHP
463 lines
15 KiB
PHP
<?php
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/**
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* Wrapper around hash() and hash_hmac() functions supporting truncated hashes
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* such as sha256-96. Any hash algorithm returned by hash_algos() (and
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* truncated versions thereof) are supported.
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*
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* If {@link self::setKey() setKey()} is called, {@link self::hash() hash()} will
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* return the HMAC as opposed to the hash.
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*
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* Here's a short example of how to use this library:
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* <code>
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* <?php
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* include 'vendor/autoload.php';
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*
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* $hash = new \phpseclib\Crypt\Hash('sha512');
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*
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* $hash->setKey('abcdefg');
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*
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* echo base64_encode($hash->hash('abcdefg'));
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* ?>
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* </code>
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*
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* @category Crypt
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* @package Hash
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright 2015 Jim Wigginton
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* @author Andreas Fischer <bantu@phpbb.com>
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* @copyright 2015 Andreas Fischer
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* @license http://www.opensource.org/licenses/mit-license.html MIT License
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* @link http://phpseclib.sourceforge.net
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*/
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namespace phpseclib\Crypt;
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use phpseclib\Math\BigInteger;
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use phpseclib\Exception\UnsupportedAlgorithmException;
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/**
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* @package Hash
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* @author Jim Wigginton <terrafrost@php.net>
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* @author Andreas Fischer <bantu@phpbb.com>
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* @access public
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*/
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class Hash
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{
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/**
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* Hash Parameter
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*
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* @see self::setHash()
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* @var int
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* @access private
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*/
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var $hashParam;
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/**
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* Byte-length of hash output (Internal HMAC)
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*
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* @see self::setHash()
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* @var int
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* @access private
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*/
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var $length;
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/**
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* Hash Algorithm
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*
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* @see self::setHash()
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* @var string
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* @access private
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*/
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var $hash;
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/**
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* Key
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*
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* @see self::setKey()
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* @var string
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* @access private
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*/
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var $key = false;
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/**
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* Initial Hash
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*
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* Used only for sha512/*
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*
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* @see self::_sha512()
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* @var array
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* @access private
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*/
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var $initial = false;
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/**
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* Outer XOR (Internal HMAC)
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*
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* Used only for sha512/*
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*
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* @see self::hash()
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* @var string
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* @access private
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*/
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var $opad;
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/**
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* Inner XOR (Internal HMAC)
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*
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* Used only for sha512/*
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*
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* @see self::hash()
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* @var string
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* @access private
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*/
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var $ipad;
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/**
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* Default Constructor.
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*
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* @param string $hash
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* @access public
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*/
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function __construct($hash = 'sha256')
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{
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$this->setHash($hash);
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$this->ipad = str_repeat(chr(0x36), 128);
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$this->opad = str_repeat(chr(0x5C), 128);
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}
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/**
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* Sets the key for HMACs
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*
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* Keys can be of any length.
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*
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* @access public
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* @param string $key
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*/
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function setKey($key = false)
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{
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$this->key = $key;
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}
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/**
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* Gets the hash function.
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*
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* As set by the constructor or by the setHash() method.
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*
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* @access public
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* @return string
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*/
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function getHash()
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{
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return $this->hashParam;
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}
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/**
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* Sets the hash function.
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*
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* @access public
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* @param string $hash
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*/
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function setHash($hash)
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{
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$this->hashParam = $hash = strtolower($hash);
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switch ($hash) {
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case 'md2-96':
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case 'md5-96':
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case 'sha1-96':
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case 'sha256-96':
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case 'sha512-96':
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case 'sha512/224-96':
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case 'sha512/256-96':
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$hash = substr($hash, 0, -3);
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$this->length = 12; // 96 / 8 = 12
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break;
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case 'md2':
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case 'md5':
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$this->length = 16;
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break;
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case 'sha1':
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$this->length = 20;
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break;
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case 'sha512/224':
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$this->length = 28;
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break;
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case 'sha256':
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case 'sha512/256':
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$this->length = 32;
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break;
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case 'sha384':
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$this->length = 48;
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break;
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case 'sha512':
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$this->length = 64;
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break;
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default:
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// see if the hash isn't "officially" supported see if it can
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// be "unofficially" supported and calculate the length
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// accordingly.
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if (in_array($hash, hash_algos())) {
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$this->length = strlen(hash($hash, '', true));
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break;
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}
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// if the hash algorithm doens't exist maybe it's a truncated
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// hash, e.g. whirlpool-12 or some such.
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if (preg_match('#(-\d+)$#', $hash, $matches)) {
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$hash = substr($hash, 0, -strlen($matches[1]));
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if (in_array($hash, hash_algos())) {
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$this->length = abs($matches[1]) >> 3;
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break;
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}
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}
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throw new UnsupportedAlgorithmException(
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"$hash is not a supported algorithm"
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);
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}
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if ($hash == 'sha512/224' || $hash == 'sha512/256') {
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// from http://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf#page=24
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$this->initial = $hash == 'sha512/256' ?
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array(
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'22312194FC2BF72C', '9F555FA3C84C64C2', '2393B86B6F53B151', '963877195940EABD',
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'96283EE2A88EFFE3', 'BE5E1E2553863992', '2B0199FC2C85B8AA', '0EB72DDC81C52CA2'
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) :
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array(
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'8C3D37C819544DA2', '73E1996689DCD4D6', '1DFAB7AE32FF9C82', '679DD514582F9FCF',
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'0F6D2B697BD44DA8', '77E36F7304C48942', '3F9D85A86A1D36C8', '1112E6AD91D692A1'
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);
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for ($i = 0; $i < 8; $i++) {
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$this->initial[$i] = new BigInteger($this->initial[$i], 16);
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$this->initial[$i]->setPrecision(64);
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}
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}
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$this->hash = $hash;
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}
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/**
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* Compute the HMAC.
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*
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* @access public
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* @param string $text
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* @return string
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*/
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function hash($text)
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{
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switch ($this->hash) {
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case 'sha512/224':
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case 'sha512/256':
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if (empty($this->key) || !is_string($this->key)) {
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return substr(self::_sha512($text, $this->initial), 0, $this->length);
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}
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/* "Applications that use keys longer than B bytes will first hash the key using H and then use the
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resultant L byte string as the actual key to HMAC."
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-- http://tools.ietf.org/html/rfc2104#section-2 */
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$key = strlen($this->key) > $this->b ? self::_sha512($this->key, $this->initial) : $this->key;
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$key = str_pad($this->key, 128, chr(0)); // step 1
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$temp = $this->ipad ^ $this->key; // step 2
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$temp .= $text; // step 3
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$temp = self::_sha512($temp, $this->initial); // step 4
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$output = $this->opad ^ $this->key; // step 5
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$output.= $temp; // step 6
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$output = self::_sha512($output, $this->initial); // step 7
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return substr($output, 0, $this->length);
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}
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$output = !empty($this->key) || is_string($this->key) ?
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hash_hmac($this->hash, $text, $this->key, true) :
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hash($this->hash, $text, true);
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return strlen($output) > $this->length
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? substr($output, 0, $this->length)
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: $output;
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}
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/**
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* Returns the hash length (in bytes)
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*
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* @access public
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* @return int
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*/
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function getLength()
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{
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return $this->length;
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}
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/**
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* Pure-PHP implementation of SHA512
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*
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* @access private
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* @param string $m
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*/
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static function _sha512($m, $hash)
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{
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static $k;
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if (!isset($k)) {
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// Initialize table of round constants
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// (first 64 bits of the fractional parts of the cube roots of the first 80 primes 2..409)
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$k = array(
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'428a2f98d728ae22', '7137449123ef65cd', 'b5c0fbcfec4d3b2f', 'e9b5dba58189dbbc',
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'3956c25bf348b538', '59f111f1b605d019', '923f82a4af194f9b', 'ab1c5ed5da6d8118',
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'd807aa98a3030242', '12835b0145706fbe', '243185be4ee4b28c', '550c7dc3d5ffb4e2',
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'72be5d74f27b896f', '80deb1fe3b1696b1', '9bdc06a725c71235', 'c19bf174cf692694',
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'e49b69c19ef14ad2', 'efbe4786384f25e3', '0fc19dc68b8cd5b5', '240ca1cc77ac9c65',
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'2de92c6f592b0275', '4a7484aa6ea6e483', '5cb0a9dcbd41fbd4', '76f988da831153b5',
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'983e5152ee66dfab', 'a831c66d2db43210', 'b00327c898fb213f', 'bf597fc7beef0ee4',
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'c6e00bf33da88fc2', 'd5a79147930aa725', '06ca6351e003826f', '142929670a0e6e70',
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'27b70a8546d22ffc', '2e1b21385c26c926', '4d2c6dfc5ac42aed', '53380d139d95b3df',
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'650a73548baf63de', '766a0abb3c77b2a8', '81c2c92e47edaee6', '92722c851482353b',
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'a2bfe8a14cf10364', 'a81a664bbc423001', 'c24b8b70d0f89791', 'c76c51a30654be30',
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'd192e819d6ef5218', 'd69906245565a910', 'f40e35855771202a', '106aa07032bbd1b8',
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'19a4c116b8d2d0c8', '1e376c085141ab53', '2748774cdf8eeb99', '34b0bcb5e19b48a8',
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'391c0cb3c5c95a63', '4ed8aa4ae3418acb', '5b9cca4f7763e373', '682e6ff3d6b2b8a3',
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'748f82ee5defb2fc', '78a5636f43172f60', '84c87814a1f0ab72', '8cc702081a6439ec',
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'90befffa23631e28', 'a4506cebde82bde9', 'bef9a3f7b2c67915', 'c67178f2e372532b',
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'ca273eceea26619c', 'd186b8c721c0c207', 'eada7dd6cde0eb1e', 'f57d4f7fee6ed178',
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'06f067aa72176fba', '0a637dc5a2c898a6', '113f9804bef90dae', '1b710b35131c471b',
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'28db77f523047d84', '32caab7b40c72493', '3c9ebe0a15c9bebc', '431d67c49c100d4c',
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'4cc5d4becb3e42b6', '597f299cfc657e2a', '5fcb6fab3ad6faec', '6c44198c4a475817'
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);
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for ($i = 0; $i < 80; $i++) {
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$k[$i] = new BigInteger($k[$i], 16);
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}
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}
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// Pre-processing
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$length = strlen($m);
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// to round to nearest 112 mod 128, we'll add 128 - (length + (128 - 112)) % 128
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$m.= str_repeat(chr(0), 128 - (($length + 16) & 0x7F));
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$m[$length] = chr(0x80);
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// we don't support hashing strings 512MB long
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$m.= pack('N4', 0, 0, 0, $length << 3);
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// Process the message in successive 1024-bit chunks
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$chunks = str_split($m, 128);
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foreach ($chunks as $chunk) {
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$w = array();
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for ($i = 0; $i < 16; $i++) {
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$temp = new BigInteger(self::_string_shift($chunk, 8), 256);
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$temp->setPrecision(64);
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$w[] = $temp;
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}
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// Extend the sixteen 32-bit words into eighty 32-bit words
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for ($i = 16; $i < 80; $i++) {
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$temp = array(
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$w[$i - 15]->bitwise_rightRotate(1),
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$w[$i - 15]->bitwise_rightRotate(8),
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$w[$i - 15]->bitwise_rightShift(7)
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);
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$s0 = $temp[0]->bitwise_xor($temp[1]);
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$s0 = $s0->bitwise_xor($temp[2]);
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$temp = array(
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$w[$i - 2]->bitwise_rightRotate(19),
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$w[$i - 2]->bitwise_rightRotate(61),
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$w[$i - 2]->bitwise_rightShift(6)
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);
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$s1 = $temp[0]->bitwise_xor($temp[1]);
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$s1 = $s1->bitwise_xor($temp[2]);
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$w[$i] = clone $w[$i - 16];
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$w[$i] = $w[$i]->add($s0);
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$w[$i] = $w[$i]->add($w[$i - 7]);
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$w[$i] = $w[$i]->add($s1);
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}
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// Initialize hash value for this chunk
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$a = clone $hash[0];
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$b = clone $hash[1];
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$c = clone $hash[2];
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$d = clone $hash[3];
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$e = clone $hash[4];
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$f = clone $hash[5];
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$g = clone $hash[6];
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$h = clone $hash[7];
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// Main loop
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for ($i = 0; $i < 80; $i++) {
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$temp = array(
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$a->bitwise_rightRotate(28),
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$a->bitwise_rightRotate(34),
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$a->bitwise_rightRotate(39)
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);
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$s0 = $temp[0]->bitwise_xor($temp[1]);
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$s0 = $s0->bitwise_xor($temp[2]);
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$temp = array(
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$a->bitwise_and($b),
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$a->bitwise_and($c),
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$b->bitwise_and($c)
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);
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$maj = $temp[0]->bitwise_xor($temp[1]);
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$maj = $maj->bitwise_xor($temp[2]);
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$t2 = $s0->add($maj);
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$temp = array(
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$e->bitwise_rightRotate(14),
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$e->bitwise_rightRotate(18),
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$e->bitwise_rightRotate(41)
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);
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$s1 = $temp[0]->bitwise_xor($temp[1]);
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$s1 = $s1->bitwise_xor($temp[2]);
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$temp = array(
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$e->bitwise_and($f),
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$g->bitwise_and($e->bitwise_not())
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);
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$ch = $temp[0]->bitwise_xor($temp[1]);
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$t1 = $h->add($s1);
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$t1 = $t1->add($ch);
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$t1 = $t1->add($k[$i]);
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$t1 = $t1->add($w[$i]);
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$h = clone $g;
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$g = clone $f;
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$f = clone $e;
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$e = $d->add($t1);
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$d = clone $c;
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$c = clone $b;
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$b = clone $a;
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$a = $t1->add($t2);
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}
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// Add this chunk's hash to result so far
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$hash = array(
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$hash[0]->add($a),
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$hash[1]->add($b),
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$hash[2]->add($c),
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$hash[3]->add($d),
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$hash[4]->add($e),
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$hash[5]->add($f),
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$hash[6]->add($g),
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$hash[7]->add($h)
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);
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}
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// Produce the final hash value (big-endian)
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// (\phpseclib\Crypt\Hash::hash() trims the output for hashes but not for HMACs. as such, we trim the output here)
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$temp = $hash[0]->toBytes() . $hash[1]->toBytes() . $hash[2]->toBytes() . $hash[3]->toBytes() .
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$hash[4]->toBytes() . $hash[5]->toBytes() . $hash[6]->toBytes() . $hash[7]->toBytes();
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return $temp;
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}
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/**
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* String Shift
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*
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* Inspired by array_shift
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*
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* @param string $string
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* @param int $index
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* @return string
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* @access private
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*/
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static function _string_shift(&$string, $index = 1)
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{
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$substr = substr($string, 0, $index);
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$string = substr($string, $index);
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return $substr;
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}
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}
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