defender-security / extra / hub-connector / lib / PHPSecLib / Crypt / Hash.php

Hash.php in Defender Security – Malware Scanner, Login Security & Firewall 6.3.0, at extra/hub-connector/lib/PHPSecLib/Crypt/Hash.php

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1	<?php
2
3	/**
4	* Pure-PHP implementations of keyed-hash message authentication codes (HMACs) and various cryptographic hashing functions.
5	*
6	* Uses hash() or mhash() if available and an internal implementation, otherwise. Currently supports the following:
7	*
8	* md2, md5, md5-96, sha1, sha1-96, sha256, sha256-96, sha384, and sha512, sha512-96
9	*
10	* If {@link self::setKey() setKey()} is called, {@link self::hash() hash()} will return the HMAC as opposed to
11	* the hash. If no valid algorithm is provided, sha1 will be used.
12	*
13	* PHP versions 4 and 5
14	*
15	* {@internal The variable names are the same as those in
16	* {@link http://tools.ietf.org/html/rfc2104#section-2 RFC2104}.}}
17	*
18	* Here's a short example of how to use this library:
19	* <code>
20	* <?php
21	* include 'Crypt/Hash.php';
22	*
23	* $hash = new Crypt_Hash('sha1');
24	*
25	* $hash->setKey('abcdefg');
26	*
27	* echo base64_encode($hash->hash('abcdefg'));
28	* ?>
29	* </code>
30	*
31	* LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
32	* of this software and associated documentation files (the "Software"), to deal
33	* in the Software without restriction, including without limitation the rights
34	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
35	* copies of the Software, and to permit persons to whom the Software is
36	* furnished to do so, subject to the following conditions:
37	*
38	* The above copyright notice and this permission notice shall be included in
39	* all copies or substantial portions of the Software.
40	*
41	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
42	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
43	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
44	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
45	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
46	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
47	* THE SOFTWARE.
48	*
49	* @category Crypt
50	* @package Crypt_Hash
51	* @author Jim Wigginton <[email protected]>
52	* @copyright 2007 Jim Wigginton
53	* @license http://www.opensource.org/licenses/mit-license.html MIT License
54	* @link http://phpseclib.sourceforge.net
55	*/
56
57	/**#@+
58	* @access private
59	* @see self::Crypt_Hash()
60	*/
61	/**
62	* Toggles the internal implementation
63	*/
64	define('CRYPT_HASH_MODE_INTERNAL', 1);
65	/**
66	* Toggles the mhash() implementation, which has been deprecated on PHP 5.3.0+.
67	*/
68	define('CRYPT_HASH_MODE_MHASH', 2);
69	/**
70	* Toggles the hash() implementation, which works on PHP 5.1.2+.
71	*/
72	define('CRYPT_HASH_MODE_HASH', 3);
73	/*#@-/
74
75	/**
76	* Pure-PHP implementations of keyed-hash message authentication codes (HMACs) and various cryptographic hashing functions.
77	*
78	* @package Crypt_Hash
79	* @author Jim Wigginton <[email protected]>
80	* @access public
81	*/
82	class Crypt_Hash
83	{
84	/**
85	* Hash Parameter
86	*
87	* @see self::setHash()
88	* @var int
89	* @access private
90	*/
91	var $hashParam;
92
93	/**
94	* Byte-length of compression blocks / key (Internal HMAC)
95	*
96	* @see self::setAlgorithm()
97	* @var int
98	* @access private
99	*/
100	var $b;
101
102	/**
103	* Byte-length of hash output (Internal HMAC)
104	*
105	* @see self::setHash()
106	* @var int
107	* @access private
108	*/
109	var $l = false;
110
111	/**
112	* Hash Algorithm
113	*
114	* @see self::setHash()
115	* @var string
116	* @access private
117	*/
118	var $hash;
119
120	/**
121	* Key
122	*
123	* @see self::setKey()
124	* @var string
125	* @access private
126	*/
127	var $key = false;
128
129	/**
130	* Computed Key
131	*
132	* @see self::_computeKey()
133	* @var string
134	* @access private
135	*/
136	var $computedKey = false;
137
138	/**
139	* Outer XOR (Internal HMAC)
140	*
141	* @see self::setKey()
142	* @var string
143	* @access private
144	*/
145	var $opad;
146
147	/**
148	* Inner XOR (Internal HMAC)
149	*
150	* @see self::setKey()
151	* @var string
152	* @access private
153	*/
154	var $ipad;
155
156	/**
157	* Engine
158	*
159	* @see self::setHash()
160	* @var string
161	* @access private
162	*/
163	var $engine;
164
165	/**
166	* Default Constructor.
167	*
168	* @param string $hash
169	* @return Crypt_Hash
170	* @access public
171	*/
172	function __construct($hash = 'sha1')
173	{
174	if (!defined('CRYPT_HASH_MODE')) {
175	switch (true) {
176	case extension_loaded('hash'):
177	define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_HASH);
178	break;
179	case extension_loaded('mhash'):
180	define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_MHASH);
181	break;
182	default:
183	define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_INTERNAL);
184	}
185	}
186
187	$this->setHash($hash);
188	}
189
190	/**
191	* PHP4 compatible Default Constructor.
192	*
193	* @see self::__construct()
194	* @param string $hash
195	* @access public
196	*/
197	function Crypt_Hash($hash = 'sha1')
198	{
199	$this->__construct($hash);
200	}
201
202	/**
203	* Sets the key for HMACs
204	*
205	* Keys can be of any length.
206	*
207	* @access public
208	* @param string $key
209	*/
210	function setKey($key = false)
211	{
212	$this->key = $key;
213	$this->_computeKey();
214	}
215
216	/**
217	* Pre-compute the key used by the HMAC
218	*
219	* Quoting http://tools.ietf.org/html/rfc2104#section-2, "Applications that use keys longer than B bytes
220	* will first hash the key using H and then use the resultant L byte string as the actual key to HMAC."
221	*
222	* As documented in https://www.reddit.com/r/PHP/comments/9nct2l/symfonypolyfill_hash_pbkdf2_correct_fix_for/
223	* when doing an HMAC multiple times it's faster to compute the hash once instead of computing it during
224	* every call
225	*
226	* @access private
227	*/
228	function _computeKey()
229	{
230	if ($this->key === false) {
231	$this->computedKey = false;
232	return;
233	}
234
235	if (strlen($this->key) <= $this->b) {
236	$this->computedKey = $this->key;
237	return;
238	}
239
240	switch ($this->engine) {
241	case CRYPT_HASH_MODE_MHASH:
242	$this->computedKey = mhash($this->hash, $this->key);
243	break;
244	case CRYPT_HASH_MODE_HASH:
245	$this->computedKey = hash($this->hash, $this->key, true);
246	break;
247	case CRYPT_HASH_MODE_INTERNAL:
248	$this->computedKey = call_user_func($this->hash, $this->key);
249	}
250	}
251
252	/**
253	* Gets the hash function.
254	*
255	* As set by the constructor or by the setHash() method.
256	*
257	* @access public
258	* @return string
259	*/
260	function getHash()
261	{
262	return $this->hashParam;
263	}
264
265	/**
266	* Sets the hash function.
267	*
268	* @access public
269	* @param string $hash
270	*/
271	function setHash($hash)
272	{
273	$this->hashParam = $hash = strtolower($hash);
274	switch ($hash) {
275	case 'md5-96':
276	case 'sha1-96':
277	case 'sha256-96':
278	case 'sha512-96':
279	$hash = substr($hash, 0, -3);
280	$this->l = 12; // 96 / 8 = 12
281	break;
282	case 'md2':
283	case 'md5':
284	$this->l = 16;
285	break;
286	case 'sha1':
287	$this->l = 20;
288	break;
289	case 'sha256':
290	$this->l = 32;
291	break;
292	case 'sha384':
293	$this->l = 48;
294	break;
295	case 'sha512':
296	$this->l = 64;
297	}
298
299	switch ($hash) {
300	case 'md2-96':
301	case 'md2':
302	$this->b = 16;
303	case 'md5-96':
304	case 'sha1-96':
305	case 'sha224-96':
306	case 'sha256-96':
307	case 'md2':
308	case 'md5':
309	case 'sha1':
310	case 'sha224':
311	case 'sha256':
312	$this->b = 64;
313	break;
314	default:
315	$this->b = 128;
316	}
317
318	switch ($hash) {
319	case 'md2':
320	$this->engine = CRYPT_HASH_MODE == CRYPT_HASH_MODE_HASH && in_array('md2', hash_algos()) ?
321	CRYPT_HASH_MODE_HASH : CRYPT_HASH_MODE_INTERNAL;
322	break;
323	case 'sha384':
324	case 'sha512':
325	$this->engine = CRYPT_HASH_MODE == CRYPT_HASH_MODE_MHASH ? CRYPT_HASH_MODE_INTERNAL : CRYPT_HASH_MODE;
326	break;
327	default:
328	$this->engine = CRYPT_HASH_MODE;
329	}
330
331	switch ($this->engine) {
332	case CRYPT_HASH_MODE_MHASH:
333	switch ($hash) {
334	case 'md5':
335	$this->hash = MHASH_MD5;
336	break;
337	case 'sha256':
338	$this->hash = MHASH_SHA256;
339	break;
340	case 'sha1':
341	default:
342	$this->hash = MHASH_SHA1;
343	}
344	$this->_computeKey();
345	return;
346	case CRYPT_HASH_MODE_HASH:
347	switch ($hash) {
348	case 'md5':
349	$this->hash = 'md5';
350	return;
351	case 'md2':
352	case 'sha256':
353	case 'sha384':
354	case 'sha512':
355	$this->hash = $hash;
356	return;
357	case 'sha1':
358	default:
359	$this->hash = 'sha1';
360	}
361	$this->_computeKey();
362	return;
363	}
364
365	switch ($hash) {
366	case 'md2':
367	$this->hash = array($this, '_md2');
368	break;
369	case 'md5':
370	$this->hash = array($this, '_md5');
371	break;
372	case 'sha256':
373	$this->hash = array($this, '_sha256');
374	break;
375	case 'sha384':
376	case 'sha512':
377	$this->hash = array($this, '_sha512');
378	break;
379	case 'sha1':
380	default:
381	$this->hash = array($this, '_sha1');
382	}
383
384	$this->ipad = str_repeat(chr(0x36), $this->b);
385	$this->opad = str_repeat(chr(0x5C), $this->b);
386
387	$this->_computeKey();
388	}
389
390	/**
391	* Compute the HMAC.
392	*
393	* @access public
394	* @param string $text
395	* @return string
396	*/
397	function hash($text)
398	{
399	if (!empty($this->key) \|\| is_string($this->key)) {
400	switch ($this->engine) {
401	case CRYPT_HASH_MODE_MHASH:
402	$output = mhash($this->hash, $text, $this->computedKey);
403	break;
404	case CRYPT_HASH_MODE_HASH:
405	$output = hash_hmac($this->hash, $text, $this->computedKey, true);
406	break;
407	case CRYPT_HASH_MODE_INTERNAL:
408	$key = str_pad($this->computedKey, $this->b, chr(0)); // step 1
409	$temp = $this->ipad ^ $key; // step 2
410	$temp .= $text; // step 3
411	$temp = call_user_func($this->hash, $temp); // step 4
412	$output = $this->opad ^ $key; // step 5
413	$output.= $temp; // step 6
414	$output = call_user_func($this->hash, $output); // step 7
415	}
416	} else {
417	switch ($this->engine) {
418	case CRYPT_HASH_MODE_MHASH:
419	$output = mhash($this->hash, $text);
420	break;
421	case CRYPT_HASH_MODE_HASH:
422	$output = hash($this->hash, $text, true);
423	break;
424	case CRYPT_HASH_MODE_INTERNAL:
425	$output = call_user_func($this->hash, $text);
426	}
427	}
428
429	return substr($output, 0, $this->l);
430	}
431
432	/**
433	* Returns the hash length (in bytes)
434	*
435	* @access public
436	* @return int
437	*/
438	function getLength()
439	{
440	return $this->l;
441	}
442
443	/**
444	* Wrapper for MD5
445	*
446	* @access private
447	* @param string $m
448	*/
449	function _md5($m)
450	{
451	return pack('H*', md5($m));
452	}
453
454	/**
455	* Wrapper for SHA1
456	*
457	* @access private
458	* @param string $m
459	*/
460	function _sha1($m)
461	{
462	return pack('H*', sha1($m));
463	}
464
465	/**
466	* Pure-PHP implementation of MD2
467	*
468	* See {@link http://tools.ietf.org/html/rfc1319 RFC1319}.
469	*
470	* @access private
471	* @param string $m
472	*/
473	function _md2($m)
474	{
475	static $s = array(
476	41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
477	19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
478	76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
479	138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
480	245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
481	148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
482	39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
483	181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
484	150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
485	112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
486	96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
487	85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
488	234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
489	129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
490	8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
491	203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
492	166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
493	31, 26, 219, 153, 141, 51, 159, 17, 131, 20
494	);
495
496	// Step 1. Append Padding Bytes
497	$pad = 16 - (strlen($m) & 0xF);
498	$m.= str_repeat(chr($pad), $pad);
499
500	$length = strlen($m);
501
502	// Step 2. Append Checksum
503	$c = str_repeat(chr(0), 16);
504	$l = chr(0);
505	for ($i = 0; $i < $length; $i+= 16) {
506	for ($j = 0; $j < 16; $j++) {
507	// RFC1319 incorrectly states that C[j] should be set to S[c xor L]
508	//$c[$j] = chr($s[ord($m[$i + $j] ^ $l)]);
509	// per <http://www.rfc-editor.org/errata_search.php?rfc=1319>, however, C[j] should be set to S[c xor L] xor C[j]
510	$c[$j] = chr($s[ord($m[$i + $j] ^ $l)] ^ ord($c[$j]));
511	$l = $c[$j];
512	}
513	}
514	$m.= $c;
515
516	$length+= 16;
517
518	// Step 3. Initialize MD Buffer
519	$x = str_repeat(chr(0), 48);
520
521	// Step 4. Process Message in 16-Byte Blocks
522	for ($i = 0; $i < $length; $i+= 16) {
523	for ($j = 0; $j < 16; $j++) {
524	$x[$j + 16] = $m[$i + $j];
525	$x[$j + 32] = $x[$j + 16] ^ $x[$j];
526	}
527	$t = chr(0);
528	for ($j = 0; $j < 18; $j++) {
529	for ($k = 0; $k < 48; $k++) {
530	$x[$k] = $t = $x[$k] ^ chr($s[ord($t)]);
531	//$t = $x[$k] = $x[$k] ^ chr($s[ord($t)]);
532	}
533	$t = chr(ord($t) + $j);
534	}
535	}
536
537	// Step 5. Output
538	return substr($x, 0, 16);
539	}
540
541	/**
542	* Pure-PHP implementation of SHA256
543	*
544	* See {@link http://en.wikipedia.org/wiki/SHA_hash_functions#SHA-256_.28a_SHA-2_variant.29_pseudocode SHA-256 (a SHA-2 variant) pseudocode - Wikipedia}.
545	*
546	* @access private
547	* @param string $m
548	*/
549	function _sha256($m)
550	{
551	if (extension_loaded('suhosin')) {
552	return pack('H*', sha256($m));
553	}
554
555	// Initialize variables
556	$hash = array(
557	0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
558	);
559	// Initialize table of round constants
560	// (first 32 bits of the fractional parts of the cube roots of the first 64 primes 2..311)
561	static $k = array(
562	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
563	0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
564	0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
565	0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
566	0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
567	0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
568	0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
569	0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
570	);
571
572	// Pre-processing
573	$length = strlen($m);
574	// to round to nearest 56 mod 64, we'll add 64 - (length + (64 - 56)) % 64
575	$m.= str_repeat(chr(0), 64 - (($length + 8) & 0x3F));
576	$m[$length] = chr(0x80);
577	// we don't support hashing strings 512MB long
578	$m.= pack('N2', 0, $length << 3);
579
580	// Process the message in successive 512-bit chunks
581	$chunks = str_split($m, 64);
582	foreach ($chunks as $chunk) {
583	$w = array();
584	for ($i = 0; $i < 16; $i++) {
585	extract(unpack('Ntemp', $this->_string_shift($chunk, 4)));
586	$w[] = $temp;
587	}
588
589	// Extend the sixteen 32-bit words into sixty-four 32-bit words
590	for ($i = 16; $i < 64; $i++) {
591	// @codingStandardsIgnoreStart
592	$s0 = $this->_rightRotate($w[$i - 15], 7) ^
593	$this->_rightRotate($w[$i - 15], 18) ^
594	$this->_rightShift( $w[$i - 15], 3);
595	$s1 = $this->_rightRotate($w[$i - 2], 17) ^
596	$this->_rightRotate($w[$i - 2], 19) ^
597	$this->_rightShift( $w[$i - 2], 10);
598	// @codingStandardsIgnoreEnd
599	$w[$i] = $this->_add($w[$i - 16], $s0, $w[$i - 7], $s1);
600	}
601
602	// Initialize hash value for this chunk
603	list($a, $b, $c, $d, $e, $f, $g, $h) = $hash;
604
605	// Main loop
606	for ($i = 0; $i < 64; $i++) {
607	$s0 = $this->_rightRotate($a, 2) ^
608	$this->_rightRotate($a, 13) ^
609	$this->_rightRotate($a, 22);
610	$maj = ($a & $b) ^
611	($a & $c) ^
612	($b & $c);
613	$t2 = $this->_add($s0, $maj);
614
615	$s1 = $this->_rightRotate($e, 6) ^
616	$this->_rightRotate($e, 11) ^
617	$this->_rightRotate($e, 25);
618	$ch = ($e & $f) ^
619	($this->_not($e) & $g);
620	$t1 = $this->_add($h, $s1, $ch, $k[$i], $w[$i]);
621
622	$h = $g;
623	$g = $f;
624	$f = $e;
625	$e = $this->_add($d, $t1);
626	$d = $c;
627	$c = $b;
628	$b = $a;
629	$a = $this->_add($t1, $t2);
630	}
631
632	// Add this chunk's hash to result so far
633	$hash = array(
634	$this->_add($hash[0], $a),
635	$this->_add($hash[1], $b),
636	$this->_add($hash[2], $c),
637	$this->_add($hash[3], $d),
638	$this->_add($hash[4], $e),
639	$this->_add($hash[5], $f),
640	$this->_add($hash[6], $g),
641	$this->_add($hash[7], $h)
642	);
643	}
644
645	// Produce the final hash value (big-endian)
646	return pack('N8', $hash[0], $hash[1], $hash[2], $hash[3], $hash[4], $hash[5], $hash[6], $hash[7]);
647	}
648
649	/**
650	* Pure-PHP implementation of SHA384 and SHA512
651	*
652	* @access private
653	* @param string $m
654	*/
655	function _sha512($m)
656	{
657	if (!class_exists('Math_BigInteger')) {
658	require_once dirname(__FILE__).'/../Math/BigInteger.php';
659	}
660
661	static $init384, $init512, $k;
662
663	if (!isset($k)) {
664	// Initialize variables
665	$init384 = array( // initial values for SHA384
666	'cbbb9d5dc1059ed8', '629a292a367cd507', '9159015a3070dd17', '152fecd8f70e5939',
667	'67332667ffc00b31', '8eb44a8768581511', 'db0c2e0d64f98fa7', '47b5481dbefa4fa4'
668	);
669	$init512 = array( // initial values for SHA512
670	'6a09e667f3bcc908', 'bb67ae8584caa73b', '3c6ef372fe94f82b', 'a54ff53a5f1d36f1',
671	'510e527fade682d1', '9b05688c2b3e6c1f', '1f83d9abfb41bd6b', '5be0cd19137e2179'
672	);
673
674	for ($i = 0; $i < 8; $i++) {
675	$init384[$i] = new Math_BigInteger($init384[$i], 16);
676	$init384[$i]->setPrecision(64);
677	$init512[$i] = new Math_BigInteger($init512[$i], 16);
678	$init512[$i]->setPrecision(64);
679	}
680
681	// Initialize table of round constants
682	// (first 64 bits of the fractional parts of the cube roots of the first 80 primes 2..409)
683	$k = array(
684	'428a2f98d728ae22', '7137449123ef65cd', 'b5c0fbcfec4d3b2f', 'e9b5dba58189dbbc',
685	'3956c25bf348b538', '59f111f1b605d019', '923f82a4af194f9b', 'ab1c5ed5da6d8118',
686	'd807aa98a3030242', '12835b0145706fbe', '243185be4ee4b28c', '550c7dc3d5ffb4e2',
687	'72be5d74f27b896f', '80deb1fe3b1696b1', '9bdc06a725c71235', 'c19bf174cf692694',
688	'e49b69c19ef14ad2', 'efbe4786384f25e3', '0fc19dc68b8cd5b5', '240ca1cc77ac9c65',
689	'2de92c6f592b0275', '4a7484aa6ea6e483', '5cb0a9dcbd41fbd4', '76f988da831153b5',
690	'983e5152ee66dfab', 'a831c66d2db43210', 'b00327c898fb213f', 'bf597fc7beef0ee4',
691	'c6e00bf33da88fc2', 'd5a79147930aa725', '06ca6351e003826f', '142929670a0e6e70',
692	'27b70a8546d22ffc', '2e1b21385c26c926', '4d2c6dfc5ac42aed', '53380d139d95b3df',
693	'650a73548baf63de', '766a0abb3c77b2a8', '81c2c92e47edaee6', '92722c851482353b',
694	'a2bfe8a14cf10364', 'a81a664bbc423001', 'c24b8b70d0f89791', 'c76c51a30654be30',
695	'd192e819d6ef5218', 'd69906245565a910', 'f40e35855771202a', '106aa07032bbd1b8',
696	'19a4c116b8d2d0c8', '1e376c085141ab53', '2748774cdf8eeb99', '34b0bcb5e19b48a8',
697	'391c0cb3c5c95a63', '4ed8aa4ae3418acb', '5b9cca4f7763e373', '682e6ff3d6b2b8a3',
698	'748f82ee5defb2fc', '78a5636f43172f60', '84c87814a1f0ab72', '8cc702081a6439ec',
699	'90befffa23631e28', 'a4506cebde82bde9', 'bef9a3f7b2c67915', 'c67178f2e372532b',
700	'ca273eceea26619c', 'd186b8c721c0c207', 'eada7dd6cde0eb1e', 'f57d4f7fee6ed178',
701	'06f067aa72176fba', '0a637dc5a2c898a6', '113f9804bef90dae', '1b710b35131c471b',
702	'28db77f523047d84', '32caab7b40c72493', '3c9ebe0a15c9bebc', '431d67c49c100d4c',
703	'4cc5d4becb3e42b6', '597f299cfc657e2a', '5fcb6fab3ad6faec', '6c44198c4a475817'
704	);
705
706	for ($i = 0; $i < 80; $i++) {
707	$k[$i] = new Math_BigInteger($k[$i], 16);
708	}
709	}
710
711	$hash = $this->l == 48 ? $init384 : $init512;
712
713	// Pre-processing
714	$length = strlen($m);
715	// to round to nearest 112 mod 128, we'll add 128 - (length + (128 - 112)) % 128
716	$m.= str_repeat(chr(0), 128 - (($length + 16) & 0x7F));
717	$m[$length] = chr(0x80);
718	// we don't support hashing strings 512MB long
719	$m.= pack('N4', 0, 0, 0, $length << 3);
720
721	// Process the message in successive 1024-bit chunks
722	$chunks = str_split($m, 128);
723	foreach ($chunks as $chunk) {
724	$w = array();
725	for ($i = 0; $i < 16; $i++) {
726	$temp = new Math_BigInteger($this->_string_shift($chunk, 8), 256);
727	$temp->setPrecision(64);
728	$w[] = $temp;
729	}
730
731	// Extend the sixteen 32-bit words into eighty 32-bit words
732	for ($i = 16; $i < 80; $i++) {
733	$temp = array(
734	$w[$i - 15]->bitwise_rightRotate(1),
735	$w[$i - 15]->bitwise_rightRotate(8),
736	$w[$i - 15]->bitwise_rightShift(7)
737	);
738	$s0 = $temp[0]->bitwise_xor($temp[1]);
739	$s0 = $s0->bitwise_xor($temp[2]);
740	$temp = array(
741	$w[$i - 2]->bitwise_rightRotate(19),
742	$w[$i - 2]->bitwise_rightRotate(61),
743	$w[$i - 2]->bitwise_rightShift(6)
744	);
745	$s1 = $temp[0]->bitwise_xor($temp[1]);
746	$s1 = $s1->bitwise_xor($temp[2]);
747	$w[$i] = $w[$i - 16]->copy();
748	$w[$i] = $w[$i]->add($s0);
749	$w[$i] = $w[$i]->add($w[$i - 7]);
750	$w[$i] = $w[$i]->add($s1);
751	}
752
753	// Initialize hash value for this chunk
754	$a = $hash[0]->copy();
755	$b = $hash[1]->copy();
756	$c = $hash[2]->copy();
757	$d = $hash[3]->copy();
758	$e = $hash[4]->copy();
759	$f = $hash[5]->copy();
760	$g = $hash[6]->copy();
761	$h = $hash[7]->copy();
762
763	// Main loop
764	for ($i = 0; $i < 80; $i++) {
765	$temp = array(
766	$a->bitwise_rightRotate(28),
767	$a->bitwise_rightRotate(34),
768	$a->bitwise_rightRotate(39)
769	);
770	$s0 = $temp[0]->bitwise_xor($temp[1]);
771	$s0 = $s0->bitwise_xor($temp[2]);
772	$temp = array(
773	$a->bitwise_and($b),
774	$a->bitwise_and($c),
775	$b->bitwise_and($c)
776	);
777	$maj = $temp[0]->bitwise_xor($temp[1]);
778	$maj = $maj->bitwise_xor($temp[2]);
779	$t2 = $s0->add($maj);
780
781	$temp = array(
782	$e->bitwise_rightRotate(14),
783	$e->bitwise_rightRotate(18),
784	$e->bitwise_rightRotate(41)
785	);
786	$s1 = $temp[0]->bitwise_xor($temp[1]);
787	$s1 = $s1->bitwise_xor($temp[2]);
788	$temp = array(
789	$e->bitwise_and($f),
790	$g->bitwise_and($e->bitwise_not())
791	);
792	$ch = $temp[0]->bitwise_xor($temp[1]);
793	$t1 = $h->add($s1);
794	$t1 = $t1->add($ch);
795	$t1 = $t1->add($k[$i]);
796	$t1 = $t1->add($w[$i]);
797
798	$h = $g->copy();
799	$g = $f->copy();
800	$f = $e->copy();
801	$e = $d->add($t1);
802	$d = $c->copy();
803	$c = $b->copy();
804	$b = $a->copy();
805	$a = $t1->add($t2);
806	}
807
808	// Add this chunk's hash to result so far
809	$hash = array(
810	$hash[0]->add($a),
811	$hash[1]->add($b),
812	$hash[2]->add($c),
813	$hash[3]->add($d),
814	$hash[4]->add($e),
815	$hash[5]->add($f),
816	$hash[6]->add($g),
817	$hash[7]->add($h)
818	);
819	}
820
821	// Produce the final hash value (big-endian)
822	// (Crypt_Hash::hash() trims the output for hashes but not for HMACs. as such, we trim the output here)
823	$temp = $hash[0]->toBytes() . $hash[1]->toBytes() . $hash[2]->toBytes() . $hash[3]->toBytes() .
824	$hash[4]->toBytes() . $hash[5]->toBytes();
825	if ($this->l != 48) {
826	$temp.= $hash[6]->toBytes() . $hash[7]->toBytes();
827	}
828
829	return $temp;
830	}
831
832	/**
833	* Right Rotate
834	*
835	* @access private
836	* @param int $int
837	* @param int $amt
838	* @see self::_sha256()
839	* @return int
840	*/
841	function _rightRotate($int, $amt)
842	{
843	$invamt = 32 - $amt;
844	$mask = (1 << $invamt) - 1;
845	return (($int << $invamt) & 0xFFFFFFFF) \| (($int >> $amt) & $mask);
846	}
847
848	/**
849	* Right Shift
850	*
851	* @access private
852	* @param int $int
853	* @param int $amt
854	* @see self::_sha256()
855	* @return int
856	*/
857	function _rightShift($int, $amt)
858	{
859	$mask = (1 << (32 - $amt)) - 1;
860	return ($int >> $amt) & $mask;
861	}
862
863	/**
864	* Not
865	*
866	* @access private
867	* @param int $int
868	* @see self::_sha256()
869	* @return int
870	*/
871	function _not($int)
872	{
873	return ~$int & 0xFFFFFFFF;
874	}
875
876	/**
877	* Add
878	*
879	* _sha256() adds multiple unsigned 32-bit integers. Since PHP doesn't support unsigned integers and since the
880	* possibility of overflow exists, care has to be taken. Math_BigInteger() could be used but this should be faster.
881	*
882	* @return int
883	* @see self::_sha256()
884	* @access private
885	*/
886	function _add()
887	{
888	static $mod;
889	if (!isset($mod)) {
890	$mod = pow(2, 32);
891	}
892
893	$result = 0;
894	$arguments = func_get_args();
895	foreach ($arguments as $argument) {
896	$result+= $argument < 0 ? ($argument & 0x7FFFFFFF) + 0x80000000 : $argument;
897	}
898
899	switch (true) {
900	case is_int($result):
901	// PHP 5.3, per http://php.net/releases/5_3_0.php, introduced "more consistent float rounding"
902	case version_compare(PHP_VERSION, '5.3.0') >= 0 && (php_uname('m') & "\xDF\xDF\xDF") != 'ARM':
903	// PHP_OS & "\xDF\xDF\xDF" == strtoupper(substr(PHP_OS, 0, 3)), but a lot faster
904	case (PHP_OS & "\xDF\xDF\xDF") === 'WIN':
905	return fmod($result, $mod);
906	}
907
908	return (fmod($result, 0x80000000) & 0x7FFFFFFF) \|
909	((fmod(floor($result / 0x80000000), 2) & 1) << 31);
910	}
911
912	/**
913	* String Shift
914	*
915	* Inspired by array_shift
916	*
917	* @param string $string
918	* @param int $index
919	* @return string
920	* @access private
921	*/
922	function _string_shift(&$string, $index = 1)
923	{
924	$substr = substr($string, 0, $index);
925	$string = substr($string, $index);
926	return $substr;
927	}
928	}
929