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/lib/Phpseclib/Crypt/Hash.php

https://bitbucket.org/appstrakt/lib_php_phpseclib
PHP | 818 lines | 483 code | 68 blank | 267 comment | 34 complexity | 92f59c4e862285a869d029377132a0dd MD5 | raw file
  1. <?php
  2. /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
  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, sha384, and sha512
  9. *
  10. * If {@link Hash::setKey() setKey()} is called, {@link Hash::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 Hash('sha1');
  24. *
  25. * $hash->setKey('abcdefg');
  26. *
  27. * echo base64_encode($hash->hash('abcdefg'));
  28. * ?>
  29. * </code>
  30. *
  31. * LICENSE: This library is free software; you can redistribute it and/or
  32. * modify it under the terms of the GNU Lesser General Public
  33. * License as published by the Free Software Foundation; either
  34. * version 2.1 of the License, or (at your option) any later version.
  35. *
  36. * This library is distributed in the hope that it will be useful,
  37. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  38. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  39. * Lesser General Public License for more details.
  40. *
  41. * You should have received a copy of the GNU Lesser General Public
  42. * License along with this library; if not, write to the Free Software
  43. * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  44. * MA 02111-1307 USA
  45. *
  46. * @category Crypt
  47. * @package Hash
  48. * @author Jim Wigginton <terrafrost@php.net>
  49. * @copyright MMVII Jim Wigginton
  50. * @license http://www.gnu.org/licenses/lgpl.txt
  51. * @version $Id: Hash.php 81 2010-05-19 21:56:16Z admin $
  52. * @link http://phpseclib.sourceforge.net
  53. */
  54. namespace Phpseclib\Crypt;
  55. /**#@+
  56. * @access private
  57. * @see Hash::Hash()
  58. */
  59. /**
  60. * Toggles the internal implementation
  61. */
  62. define('CRYPT_HASH_MODE_INTERNAL', 1);
  63. /**
  64. * Toggles the mhash() implementation, which has been deprecated on PHP 5.3.0+.
  65. */
  66. define('CRYPT_HASH_MODE_MHASH', 2);
  67. /**
  68. * Toggles the hash() implementation, which works on PHP 5.1.2+.
  69. */
  70. define('CRYPT_HASH_MODE_HASH', 3);
  71. /**#@-*/
  72. /**
  73. * Pure-PHP implementations of keyed-hash message authentication codes (HMACs) and various cryptographic hashing functions.
  74. *
  75. * @author Jim Wigginton <terrafrost@php.net>
  76. * @version 0.1.0
  77. * @access public
  78. * @package Hash
  79. */
  80. class Hash {
  81. /**
  82. * Byte-length of compression blocks / key (Internal HMAC)
  83. *
  84. * @see Hash::setAlgorithm()
  85. * @var Integer
  86. * @access private
  87. */
  88. var $b;
  89. /**
  90. * Byte-length of hash output (Internal HMAC)
  91. *
  92. * @see Hash::setHash()
  93. * @var Integer
  94. * @access private
  95. */
  96. var $l = false;
  97. /**
  98. * Hash Algorithm
  99. *
  100. * @see Hash::setHash()
  101. * @var String
  102. * @access private
  103. */
  104. var $hash;
  105. /**
  106. * Key
  107. *
  108. * @see Hash::setKey()
  109. * @var String
  110. * @access private
  111. */
  112. var $key = '';
  113. /**
  114. * Outer XOR (Internal HMAC)
  115. *
  116. * @see Hash::setKey()
  117. * @var String
  118. * @access private
  119. */
  120. var $opad;
  121. /**
  122. * Inner XOR (Internal HMAC)
  123. *
  124. * @see Hash::setKey()
  125. * @var String
  126. * @access private
  127. */
  128. var $ipad;
  129. /**
  130. * Default Constructor.
  131. *
  132. * @param optional String $hash
  133. * @return Hash
  134. * @access public
  135. */
  136. function __construct($hash = 'sha1')
  137. {
  138. if ( !defined('CRYPT_HASH_MODE') ) {
  139. switch (true) {
  140. case extension_loaded('hash'):
  141. define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_HASH);
  142. break;
  143. case extension_loaded('mhash'):
  144. define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_MHASH);
  145. break;
  146. default:
  147. define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_INTERNAL);
  148. }
  149. }
  150. $this->setHash($hash);
  151. }
  152. /**
  153. * Sets the key for HMACs
  154. *
  155. * Keys can be of any length.
  156. *
  157. * @access public
  158. * @param String $key
  159. */
  160. function setKey($key)
  161. {
  162. $this->key = $key;
  163. }
  164. /**
  165. * Sets the hash function.
  166. *
  167. * @access public
  168. * @param String $hash
  169. */
  170. function setHash($hash)
  171. {
  172. switch ($hash) {
  173. case 'md5-96':
  174. case 'sha1-96':
  175. $this->l = 12; // 96 / 8 = 12
  176. break;
  177. case 'md2':
  178. case 'md5':
  179. $this->l = 16;
  180. break;
  181. case 'sha1':
  182. $this->l = 20;
  183. break;
  184. case 'sha256':
  185. $this->l = 32;
  186. break;
  187. case 'sha384':
  188. $this->l = 48;
  189. break;
  190. case 'sha512':
  191. $this->l = 64;
  192. }
  193. switch ($hash) {
  194. case 'md2':
  195. $mode = CRYPT_HASH_MODE_INTERNAL;
  196. break;
  197. case 'sha384':
  198. case 'sha512':
  199. $mode = CRYPT_HASH_MODE == CRYPT_HASH_MODE_MHASH ? CRYPT_HASH_MODE_INTERNAL : CRYPT_HASH_MODE;
  200. break;
  201. default:
  202. $mode = CRYPT_HASH_MODE;
  203. }
  204. switch ( $mode ) {
  205. case CRYPT_HASH_MODE_MHASH:
  206. switch ($hash) {
  207. case 'md5':
  208. case 'md5-96':
  209. $this->hash = MHASH_MD5;
  210. break;
  211. case 'sha256':
  212. $this->hash = MHASH_SHA256;
  213. break;
  214. case 'sha1':
  215. case 'sha1-96':
  216. default:
  217. $this->hash = MHASH_SHA1;
  218. }
  219. return;
  220. case CRYPT_HASH_MODE_HASH:
  221. switch ($hash) {
  222. case 'md5':
  223. case 'md5-96':
  224. $this->hash = 'md5';
  225. return;
  226. case 'sha256':
  227. case 'sha384':
  228. case 'sha512':
  229. $this->hash = $hash;
  230. return;
  231. case 'sha1':
  232. case 'sha1-96':
  233. default:
  234. $this->hash = 'sha1';
  235. }
  236. return;
  237. }
  238. switch ($hash) {
  239. case 'md2':
  240. $this->b = 16;
  241. $this->hash = array($this, '_md2');
  242. break;
  243. case 'md5':
  244. case 'md5-96':
  245. $this->b = 64;
  246. $this->hash = array($this, '_md5');
  247. break;
  248. case 'sha256':
  249. $this->b = 64;
  250. $this->hash = array($this, '_sha256');
  251. break;
  252. case 'sha384':
  253. case 'sha512':
  254. $this->b = 128;
  255. $this->hash = array($this, '_sha512');
  256. break;
  257. case 'sha1':
  258. case 'sha1-96':
  259. default:
  260. $this->b = 64;
  261. $this->hash = array($this, '_sha1');
  262. }
  263. $this->ipad = str_repeat(chr(0x36), $this->b);
  264. $this->opad = str_repeat(chr(0x5C), $this->b);
  265. }
  266. /**
  267. * Compute the HMAC.
  268. *
  269. * @access public
  270. * @param String $text
  271. * @return String
  272. */
  273. function hash($text)
  274. {
  275. $mode = is_array($this->hash) ? CRYPT_HASH_MODE_INTERNAL : CRYPT_HASH_MODE;
  276. if (!empty($this->key)) {
  277. switch ( $mode ) {
  278. case CRYPT_HASH_MODE_MHASH:
  279. $output = mhash($this->hash, $text, $this->key);
  280. break;
  281. case CRYPT_HASH_MODE_HASH:
  282. $output = hash_hmac($this->hash, $text, $this->key, true);
  283. break;
  284. case CRYPT_HASH_MODE_INTERNAL:
  285. /* "Applications that use keys longer than B bytes will first hash the key using H and then use the
  286. resultant L byte string as the actual key to HMAC."
  287. -- http://tools.ietf.org/html/rfc2104#section-2 */
  288. $key = strlen($this->key) > $this->b ? call_user_func($this->$hash, $this->key) : $this->key;
  289. $key = str_pad($key, $this->b, chr(0)); // step 1
  290. $temp = $this->ipad ^ $key; // step 2
  291. $temp .= $text; // step 3
  292. $temp = call_user_func($this->hash, $temp); // step 4
  293. $output = $this->opad ^ $key; // step 5
  294. $output.= $temp; // step 6
  295. $output = call_user_func($this->hash, $output); // step 7
  296. }
  297. } else {
  298. switch ( $mode ) {
  299. case CRYPT_HASH_MODE_MHASH:
  300. $output = mhash($this->hash, $text);
  301. break;
  302. case CRYPT_HASH_MODE_HASH:
  303. $output = hash($this->hash, $text, true);
  304. break;
  305. case CRYPT_HASH_MODE_INTERNAL:
  306. $output = call_user_func($this->hash, $text);
  307. }
  308. }
  309. return substr($output, 0, $this->l);
  310. }
  311. /**
  312. * Returns the hash length (in bytes)
  313. *
  314. * @access private
  315. * @return Integer
  316. */
  317. function getLength()
  318. {
  319. return $this->l;
  320. }
  321. /**
  322. * Wrapper for MD5
  323. *
  324. * @access private
  325. * @param String $text
  326. */
  327. function _md5($m)
  328. {
  329. return pack('H*', md5($m));
  330. }
  331. /**
  332. * Wrapper for SHA1
  333. *
  334. * @access private
  335. * @param String $text
  336. */
  337. function _sha1($m)
  338. {
  339. return pack('H*', sha1($m));
  340. }
  341. /**
  342. * Pure-PHP implementation of MD2
  343. *
  344. * See {@link http://tools.ietf.org/html/rfc1319 RFC1319}.
  345. *
  346. * @access private
  347. * @param String $text
  348. */
  349. function _md2($m)
  350. {
  351. static $s = array(
  352. 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
  353. 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
  354. 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
  355. 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
  356. 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
  357. 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
  358. 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
  359. 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
  360. 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
  361. 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
  362. 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
  363. 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
  364. 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
  365. 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
  366. 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
  367. 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
  368. 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
  369. 31, 26, 219, 153, 141, 51, 159, 17, 131, 20
  370. );
  371. // Step 1. Append Padding Bytes
  372. $pad = 16 - (strlen($m) & 0xF);
  373. $m.= str_repeat(chr($pad), $pad);
  374. $length = strlen($m);
  375. // Step 2. Append Checksum
  376. $c = str_repeat(chr(0), 16);
  377. $l = chr(0);
  378. for ($i = 0; $i < $length; $i+= 16) {
  379. for ($j = 0; $j < 16; $j++) {
  380. $c[$j] = chr($s[ord($m[$i + $j] ^ $l)]);
  381. $l = $c[$j];
  382. }
  383. }
  384. $m.= $c;
  385. $length+= 16;
  386. // Step 3. Initialize MD Buffer
  387. $x = str_repeat(chr(0), 48);
  388. // Step 4. Process Message in 16-Byte Blocks
  389. for ($i = 0; $i < $length; $i+= 16) {
  390. for ($j = 0; $j < 16; $j++) {
  391. $x[$j + 16] = $m[$i + $j];
  392. $x[$j + 32] = $x[$j + 16] ^ $x[$j];
  393. }
  394. $t = chr(0);
  395. for ($j = 0; $j < 18; $j++) {
  396. for ($k = 0; $k < 48; $k++) {
  397. $x[$k] = $t = $x[$k] ^ chr($s[ord($t)]);
  398. //$t = $x[$k] = $x[$k] ^ chr($s[ord($t)]);
  399. }
  400. $t = chr(ord($t) + $j);
  401. }
  402. }
  403. // Step 5. Output
  404. return substr($x, 0, 16);
  405. }
  406. /**
  407. * Pure-PHP implementation of SHA256
  408. *
  409. * 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}.
  410. *
  411. * @access private
  412. * @param String $text
  413. */
  414. function _sha256($m)
  415. {
  416. if (extension_loaded('suhosin')) {
  417. return pack('H*', sha256($m));
  418. }
  419. // Initialize variables
  420. $hash = array(
  421. 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
  422. );
  423. // Initialize table of round constants
  424. // (first 32 bits of the fractional parts of the cube roots of the first 64 primes 2..311)
  425. static $k = array(
  426. 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
  427. 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
  428. 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
  429. 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
  430. 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
  431. 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
  432. 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
  433. 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
  434. );
  435. // Pre-processing
  436. $length = strlen($m);
  437. // to round to nearest 56 mod 64, we'll add 64 - (length + (64 - 56)) % 64
  438. $m.= str_repeat(chr(0), 64 - (($length + 8) & 0x3F));
  439. $m[$length] = chr(0x80);
  440. // we don't support hashing strings 512MB long
  441. $m.= pack('N2', 0, $length << 3);
  442. // Process the message in successive 512-bit chunks
  443. $chunks = str_split($m, 64);
  444. foreach ($chunks as $chunk) {
  445. $w = array();
  446. for ($i = 0; $i < 16; $i++) {
  447. extract(unpack('Ntemp', $this->_string_shift($chunk, 4)));
  448. $w[] = $temp;
  449. }
  450. // Extend the sixteen 32-bit words into sixty-four 32-bit words
  451. for ($i = 16; $i < 64; $i++) {
  452. $s0 = $this->_rightRotate($w[$i - 15], 7) ^
  453. $this->_rightRotate($w[$i - 15], 18) ^
  454. $this->_rightShift( $w[$i - 15], 3);
  455. $s1 = $this->_rightRotate($w[$i - 2], 17) ^
  456. $this->_rightRotate($w[$i - 2], 19) ^
  457. $this->_rightShift( $w[$i - 2], 10);
  458. $w[$i] = $this->_add($w[$i - 16], $s0, $w[$i - 7], $s1);
  459. }
  460. // Initialize hash value for this chunk
  461. list($a, $b, $c, $d, $e, $f, $g, $h) = $hash;
  462. // Main loop
  463. for ($i = 0; $i < 64; $i++) {
  464. $s0 = $this->_rightRotate($a, 2) ^
  465. $this->_rightRotate($a, 13) ^
  466. $this->_rightRotate($a, 22);
  467. $maj = ($a & $b) ^
  468. ($a & $c) ^
  469. ($b & $c);
  470. $t2 = $this->_add($s0, $maj);
  471. $s1 = $this->_rightRotate($e, 6) ^
  472. $this->_rightRotate($e, 11) ^
  473. $this->_rightRotate($e, 25);
  474. $ch = ($e & $f) ^
  475. ($this->_not($e) & $g);
  476. $t1 = $this->_add($h, $s1, $ch, $k[$i], $w[$i]);
  477. $h = $g;
  478. $g = $f;
  479. $f = $e;
  480. $e = $this->_add($d, $t1);
  481. $d = $c;
  482. $c = $b;
  483. $b = $a;
  484. $a = $this->_add($t1, $t2);
  485. }
  486. // Add this chunk's hash to result so far
  487. $hash = array(
  488. $this->_add($hash[0], $a),
  489. $this->_add($hash[1], $b),
  490. $this->_add($hash[2], $c),
  491. $this->_add($hash[3], $d),
  492. $this->_add($hash[4], $e),
  493. $this->_add($hash[5], $f),
  494. $this->_add($hash[6], $g),
  495. $this->_add($hash[7], $h)
  496. );
  497. }
  498. // Produce the final hash value (big-endian)
  499. return pack('N8', $hash[0], $hash[1], $hash[2], $hash[3], $hash[4], $hash[5], $hash[6], $hash[7]);
  500. }
  501. /**
  502. * Pure-PHP implementation of SHA384 and SHA512
  503. *
  504. * @access private
  505. * @param String $text
  506. */
  507. function _sha512($m)
  508. {
  509. if (!class_exists('Math_BigInteger')) {
  510. require_once('Math/BigInteger.php');
  511. }
  512. static $init384, $init512, $k;
  513. if (!isset($k)) {
  514. // Initialize variables
  515. $init384 = array( // initial values for SHA384
  516. 'cbbb9d5dc1059ed8', '629a292a367cd507', '9159015a3070dd17', '152fecd8f70e5939',
  517. '67332667ffc00b31', '8eb44a8768581511', 'db0c2e0d64f98fa7', '47b5481dbefa4fa4'
  518. );
  519. $init512 = array( // initial values for SHA512
  520. '6a09e667f3bcc908', 'bb67ae8584caa73b', '3c6ef372fe94f82b', 'a54ff53a5f1d36f1',
  521. '510e527fade682d1', '9b05688c2b3e6c1f', '1f83d9abfb41bd6b', '5be0cd19137e2179'
  522. );
  523. for ($i = 0; $i < 8; $i++) {
  524. $init384[$i] = new Math_BigInteger($init384[$i], 16);
  525. $init384[$i]->setPrecision(64);
  526. $init512[$i] = new Math_BigInteger($init512[$i], 16);
  527. $init512[$i]->setPrecision(64);
  528. }
  529. // Initialize table of round constants
  530. // (first 64 bits of the fractional parts of the cube roots of the first 80 primes 2..409)
  531. $k = array(
  532. '428a2f98d728ae22', '7137449123ef65cd', 'b5c0fbcfec4d3b2f', 'e9b5dba58189dbbc',
  533. '3956c25bf348b538', '59f111f1b605d019', '923f82a4af194f9b', 'ab1c5ed5da6d8118',
  534. 'd807aa98a3030242', '12835b0145706fbe', '243185be4ee4b28c', '550c7dc3d5ffb4e2',
  535. '72be5d74f27b896f', '80deb1fe3b1696b1', '9bdc06a725c71235', 'c19bf174cf692694',
  536. 'e49b69c19ef14ad2', 'efbe4786384f25e3', '0fc19dc68b8cd5b5', '240ca1cc77ac9c65',
  537. '2de92c6f592b0275', '4a7484aa6ea6e483', '5cb0a9dcbd41fbd4', '76f988da831153b5',
  538. '983e5152ee66dfab', 'a831c66d2db43210', 'b00327c898fb213f', 'bf597fc7beef0ee4',
  539. 'c6e00bf33da88fc2', 'd5a79147930aa725', '06ca6351e003826f', '142929670a0e6e70',
  540. '27b70a8546d22ffc', '2e1b21385c26c926', '4d2c6dfc5ac42aed', '53380d139d95b3df',
  541. '650a73548baf63de', '766a0abb3c77b2a8', '81c2c92e47edaee6', '92722c851482353b',
  542. 'a2bfe8a14cf10364', 'a81a664bbc423001', 'c24b8b70d0f89791', 'c76c51a30654be30',
  543. 'd192e819d6ef5218', 'd69906245565a910', 'f40e35855771202a', '106aa07032bbd1b8',
  544. '19a4c116b8d2d0c8', '1e376c085141ab53', '2748774cdf8eeb99', '34b0bcb5e19b48a8',
  545. '391c0cb3c5c95a63', '4ed8aa4ae3418acb', '5b9cca4f7763e373', '682e6ff3d6b2b8a3',
  546. '748f82ee5defb2fc', '78a5636f43172f60', '84c87814a1f0ab72', '8cc702081a6439ec',
  547. '90befffa23631e28', 'a4506cebde82bde9', 'bef9a3f7b2c67915', 'c67178f2e372532b',
  548. 'ca273eceea26619c', 'd186b8c721c0c207', 'eada7dd6cde0eb1e', 'f57d4f7fee6ed178',
  549. '06f067aa72176fba', '0a637dc5a2c898a6', '113f9804bef90dae', '1b710b35131c471b',
  550. '28db77f523047d84', '32caab7b40c72493', '3c9ebe0a15c9bebc', '431d67c49c100d4c',
  551. '4cc5d4becb3e42b6', '597f299cfc657e2a', '5fcb6fab3ad6faec', '6c44198c4a475817'
  552. );
  553. for ($i = 0; $i < 80; $i++) {
  554. $k[$i] = new Math_BigInteger($k[$i], 16);
  555. }
  556. }
  557. $hash = $this->l == 48 ? $init384 : $init512;
  558. // Pre-processing
  559. $length = strlen($m);
  560. // to round to nearest 112 mod 128, we'll add 128 - (length + (128 - 112)) % 128
  561. $m.= str_repeat(chr(0), 128 - (($length + 16) & 0x7F));
  562. $m[$length] = chr(0x80);
  563. // we don't support hashing strings 512MB long
  564. $m.= pack('N4', 0, 0, 0, $length << 3);
  565. // Process the message in successive 1024-bit chunks
  566. $chunks = str_split($m, 128);
  567. foreach ($chunks as $chunk) {
  568. $w = array();
  569. for ($i = 0; $i < 16; $i++) {
  570. $temp = new Math_BigInteger($this->_string_shift($chunk, 8), 256);
  571. $temp->setPrecision(64);
  572. $w[] = $temp;
  573. }
  574. // Extend the sixteen 32-bit words into eighty 32-bit words
  575. for ($i = 16; $i < 80; $i++) {
  576. $temp = array(
  577. $w[$i - 15]->bitwise_rightRotate(1),
  578. $w[$i - 15]->bitwise_rightRotate(8),
  579. $w[$i - 15]->bitwise_rightShift(7)
  580. );
  581. $s0 = $temp[0]->bitwise_xor($temp[1]);
  582. $s0 = $s0->bitwise_xor($temp[2]);
  583. $temp = array(
  584. $w[$i - 2]->bitwise_rightRotate(19),
  585. $w[$i - 2]->bitwise_rightRotate(61),
  586. $w[$i - 2]->bitwise_rightShift(6)
  587. );
  588. $s1 = $temp[0]->bitwise_xor($temp[1]);
  589. $s1 = $s1->bitwise_xor($temp[2]);
  590. $w[$i] = $w[$i - 16]->copy();
  591. $w[$i] = $w[$i]->add($s0);
  592. $w[$i] = $w[$i]->add($w[$i - 7]);
  593. $w[$i] = $w[$i]->add($s1);
  594. }
  595. // Initialize hash value for this chunk
  596. $a = $hash[0]->copy();
  597. $b = $hash[1]->copy();
  598. $c = $hash[2]->copy();
  599. $d = $hash[3]->copy();
  600. $e = $hash[4]->copy();
  601. $f = $hash[5]->copy();
  602. $g = $hash[6]->copy();
  603. $h = $hash[7]->copy();
  604. // Main loop
  605. for ($i = 0; $i < 80; $i++) {
  606. $temp = array(
  607. $a->bitwise_rightRotate(28),
  608. $a->bitwise_rightRotate(34),
  609. $a->bitwise_rightRotate(39)
  610. );
  611. $s0 = $temp[0]->bitwise_xor($temp[1]);
  612. $s0 = $s0->bitwise_xor($temp[2]);
  613. $temp = array(
  614. $a->bitwise_and($b),
  615. $a->bitwise_and($c),
  616. $b->bitwise_and($c)
  617. );
  618. $maj = $temp[0]->bitwise_xor($temp[1]);
  619. $maj = $maj->bitwise_xor($temp[2]);
  620. $t2 = $s0->add($maj);
  621. $temp = array(
  622. $e->bitwise_rightRotate(14),
  623. $e->bitwise_rightRotate(18),
  624. $e->bitwise_rightRotate(41)
  625. );
  626. $s1 = $temp[0]->bitwise_xor($temp[1]);
  627. $s1 = $s1->bitwise_xor($temp[2]);
  628. $temp = array(
  629. $e->bitwise_and($f),
  630. $g->bitwise_and($e->bitwise_not())
  631. );
  632. $ch = $temp[0]->bitwise_xor($temp[1]);
  633. $t1 = $h->add($s1);
  634. $t1 = $t1->add($ch);
  635. $t1 = $t1->add($k[$i]);
  636. $t1 = $t1->add($w[$i]);
  637. $h = $g->copy();
  638. $g = $f->copy();
  639. $f = $e->copy();
  640. $e = $d->add($t1);
  641. $d = $c->copy();
  642. $c = $b->copy();
  643. $b = $a->copy();
  644. $a = $t1->add($t2);
  645. }
  646. // Add this chunk's hash to result so far
  647. $hash = array(
  648. $hash[0]->add($a),
  649. $hash[1]->add($b),
  650. $hash[2]->add($c),
  651. $hash[3]->add($d),
  652. $hash[4]->add($e),
  653. $hash[5]->add($f),
  654. $hash[6]->add($g),
  655. $hash[7]->add($h)
  656. );
  657. }
  658. // Produce the final hash value (big-endian)
  659. // (Hash::hash() trims the output for hashes but not for HMACs. as such, we trim the output here)
  660. $temp = $hash[0]->toBytes() . $hash[1]->toBytes() . $hash[2]->toBytes() . $hash[3]->toBytes() .
  661. $hash[4]->toBytes() . $hash[5]->toBytes();
  662. if ($this->l != 48) {
  663. $temp.= $hash[6]->toBytes() . $hash[7]->toBytes();
  664. }
  665. return $temp;
  666. }
  667. /**
  668. * Right Rotate
  669. *
  670. * @access private
  671. * @param Integer $int
  672. * @param Integer $amt
  673. * @see _sha256()
  674. * @return Integer
  675. */
  676. function _rightRotate($int, $amt)
  677. {
  678. $invamt = 32 - $amt;
  679. $mask = (1 << $invamt) - 1;
  680. return (($int << $invamt) & 0xFFFFFFFF) | (($int >> $amt) & $mask);
  681. }
  682. /**
  683. * Right Shift
  684. *
  685. * @access private
  686. * @param Integer $int
  687. * @param Integer $amt
  688. * @see _sha256()
  689. * @return Integer
  690. */
  691. function _rightShift($int, $amt)
  692. {
  693. $mask = (1 << (32 - $amt)) - 1;
  694. return ($int >> $amt) & $mask;
  695. }
  696. /**
  697. * Not
  698. *
  699. * @access private
  700. * @param Integer $int
  701. * @see _sha256()
  702. * @return Integer
  703. */
  704. function _not($int)
  705. {
  706. return ~$int & 0xFFFFFFFF;
  707. }
  708. /**
  709. * Add
  710. *
  711. * _sha256() adds multiple unsigned 32-bit integers. Since PHP doesn't support unsigned integers and since the
  712. * possibility of overflow exists, care has to be taken. Math_BigInteger() could be used but this should be faster.
  713. *
  714. * @param String $string
  715. * @param optional Integer $index
  716. * @return String
  717. * @see _sha256()
  718. * @access private
  719. */
  720. function _add()
  721. {
  722. static $mod;
  723. if (!isset($mod)) {
  724. $mod = pow(2, 32);
  725. }
  726. $result = 0;
  727. $arguments = func_get_args();
  728. foreach ($arguments as $argument) {
  729. $result+= $argument < 0 ? ($argument & 0x7FFFFFFF) + 0x80000000 : $argument;
  730. }
  731. return fmod($result, $mod);
  732. }
  733. /**
  734. * String Shift
  735. *
  736. * Inspired by array_shift
  737. *
  738. * @param String $string
  739. * @param optional Integer $index
  740. * @return String
  741. * @access private
  742. */
  743. function _string_shift(&$string, $index = 1)
  744. {
  745. $substr = substr($string, 0, $index);
  746. $string = substr($string, $index);
  747. return $substr;
  748. }
  749. }