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  1. <?php
  2. /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
  3. /**
  4. * Pure-PHP implementation of Rijndael.
  5. *
  6. * Does not use mcrypt, even when available, for reasons that are explained below.
  7. *
  8. * PHP versions 4 and 5
  9. *
  10. * If {@link Crypt_Rijndael::setBlockLength() setBlockLength()} isn't called, it'll be assumed to be 128 bits. If
  11. * {@link Crypt_Rijndael::setKeyLength() setKeyLength()} isn't called, it'll be calculated from
  12. * {@link Crypt_Rijndael::setKey() setKey()}. ie. if the key is 128-bits, the key length will be 128-bits. If it's
  13. * 136-bits it'll be null-padded to 160-bits and 160 bits will be the key length until
  14. * {@link Crypt_Rijndael::setKey() setKey()} is called, again, at which point, it'll be recalculated.
  15. *
  16. * Not all Rijndael implementations may support 160-bits or 224-bits as the block length / key length. mcrypt, for example,
  17. * does not. AES, itself, only supports block lengths of 128 and key lengths of 128, 192, and 256.
  18. * {@link http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=10 Rijndael-ammended.pdf#page=10} defines the
  19. * algorithm for block lengths of 192 and 256 but not for block lengths / key lengths of 160 and 224. Indeed, 160 and 224
  20. * are first defined as valid key / block lengths in
  21. * {@link http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=44 Rijndael-ammended.pdf#page=44}:
  22. * Extensions: Other block and Cipher Key lengths.
  23. *
  24. * {@internal The variable names are the same as those in
  25. * {@link http://www.csrc.nist.gov/publications/fips/fips197/fips-197.pdf#page=10 fips-197.pdf#page=10}.}}
  26. *
  27. * Here's a short example of how to use this library:
  28. * <code>
  29. * <?php
  30. * include('Crypt/Rijndael.php');
  31. *
  32. * $rijndael = new Crypt_Rijndael();
  33. *
  34. * $rijndael->setKey('abcdefghijklmnop');
  35. *
  36. * $size = 10 * 1024;
  37. * $plaintext = '';
  38. * for ($i = 0; $i < $size; $i++) {
  39. * $plaintext.= 'a';
  40. * }
  41. *
  42. * echo $rijndael->decrypt($rijndael->encrypt($plaintext));
  43. * ?>
  44. * </code>
  45. *
  46. * LICENSE: This library is free software; you can redistribute it and/or
  47. * modify it under the terms of the GNU Lesser General Public
  48. * License as published by the Free Software Foundation; either
  49. * version 2.1 of the License, or (at your option) any later version.
  50. *
  51. * This library is distributed in the hope that it will be useful,
  52. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  53. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  54. * Lesser General Public License for more details.
  55. *
  56. * You should have received a copy of the GNU Lesser General Public
  57. * License along with this library; if not, write to the Free Software
  58. * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  59. * MA 02111-1307 USA
  60. *
  61. * @category Crypt
  62. * @package Crypt_Rijndael
  63. * @author Jim Wigginton <terrafrost@php.net>
  64. * @copyright MMVIII Jim Wigginton
  65. * @license http://www.gnu.org/licenses/lgpl.txt
  66. * @version $Id: Rijndael.php,v 1.12 2010/02/09 06:10:26 terrafrost Exp $
  67. * @link http://phpseclib.sourceforge.net
  68. */
  69. /**#@+
  70. * @access public
  71. * @see Crypt_Rijndael::encrypt()
  72. * @see Crypt_Rijndael::decrypt()
  73. */
  74. /**
  75. * Encrypt / decrypt using the Counter mode.
  76. *
  77. * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
  78. *
  79. * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
  80. */
  81. define('CRYPT_RIJNDAEL_MODE_CTR', -1);
  82. /**
  83. * Encrypt / decrypt using the Electronic Code Book mode.
  84. *
  85. * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
  86. */
  87. define('CRYPT_RIJNDAEL_MODE_ECB', 1);
  88. /**
  89. * Encrypt / decrypt using the Code Book Chaining mode.
  90. *
  91. * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
  92. */
  93. define('CRYPT_RIJNDAEL_MODE_CBC', 2);
  94. /**#@-*/
  95. /**#@+
  96. * @access private
  97. * @see Crypt_Rijndael::Crypt_Rijndael()
  98. */
  99. /**
  100. * Toggles the internal implementation
  101. */
  102. define('CRYPT_RIJNDAEL_MODE_INTERNAL', 1);
  103. /**
  104. * Toggles the mcrypt implementation
  105. */
  106. define('CRYPT_RIJNDAEL_MODE_MCRYPT', 2);
  107. /**#@-*/
  108. /**
  109. * Pure-PHP implementation of Rijndael.
  110. *
  111. * @author Jim Wigginton <terrafrost@php.net>
  112. * @version 0.1.0
  113. * @access public
  114. * @package Crypt_Rijndael
  115. */
  116. class Crypt_Rijndael {
  117. /**
  118. * The Encryption Mode
  119. *
  120. * @see Crypt_Rijndael::Crypt_Rijndael()
  121. * @var Integer
  122. * @access private
  123. */
  124. var $mode;
  125. /**
  126. * The Key
  127. *
  128. * @see Crypt_Rijndael::setKey()
  129. * @var String
  130. * @access private
  131. */
  132. var $key = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
  133. /**
  134. * The Initialization Vector
  135. *
  136. * @see Crypt_Rijndael::setIV()
  137. * @var String
  138. * @access private
  139. */
  140. var $iv = '';
  141. /**
  142. * A "sliding" Initialization Vector
  143. *
  144. * @see Crypt_Rijndael::enableContinuousBuffer()
  145. * @var String
  146. * @access private
  147. */
  148. var $encryptIV = '';
  149. /**
  150. * A "sliding" Initialization Vector
  151. *
  152. * @see Crypt_Rijndael::enableContinuousBuffer()
  153. * @var String
  154. * @access private
  155. */
  156. var $decryptIV = '';
  157. /**
  158. * Continuous Buffer status
  159. *
  160. * @see Crypt_Rijndael::enableContinuousBuffer()
  161. * @var Boolean
  162. * @access private
  163. */
  164. var $continuousBuffer = false;
  165. /**
  166. * Padding status
  167. *
  168. * @see Crypt_Rijndael::enablePadding()
  169. * @var Boolean
  170. * @access private
  171. */
  172. var $padding = true;
  173. /**
  174. * Does the key schedule need to be (re)calculated?
  175. *
  176. * @see setKey()
  177. * @see setBlockLength()
  178. * @see setKeyLength()
  179. * @var Boolean
  180. * @access private
  181. */
  182. var $changed = true;
  183. /**
  184. * Has the key length explicitly been set or should it be derived from the key, itself?
  185. *
  186. * @see setKeyLength()
  187. * @var Boolean
  188. * @access private
  189. */
  190. var $explicit_key_length = false;
  191. /**
  192. * The Key Schedule
  193. *
  194. * @see _setup()
  195. * @var Array
  196. * @access private
  197. */
  198. var $w;
  199. /**
  200. * The Inverse Key Schedule
  201. *
  202. * @see _setup()
  203. * @var Array
  204. * @access private
  205. */
  206. var $dw;
  207. /**
  208. * The Block Length
  209. *
  210. * @see setBlockLength()
  211. * @var Integer
  212. * @access private
  213. * @internal The max value is 32, the min value is 16. All valid values are multiples of 4. Exists in conjunction with
  214. * $Nb because we need this value and not $Nb to pad strings appropriately.
  215. */
  216. var $block_size = 16;
  217. /**
  218. * The Block Length divided by 32
  219. *
  220. * @see setBlockLength()
  221. * @var Integer
  222. * @access private
  223. * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4. Exists in conjunction with $block_size
  224. * because the encryption / decryption / key schedule creation requires this number and not $block_size. We could
  225. * derive this from $block_size or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu
  226. * of that, we'll just precompute it once.
  227. *
  228. */
  229. var $Nb = 4;
  230. /**
  231. * The Key Length
  232. *
  233. * @see setKeyLength()
  234. * @var Integer
  235. * @access private
  236. * @internal The max value is 256 / 8 = 32, the min value is 128 / 8 = 16. Exists in conjunction with $key_size
  237. * because the encryption / decryption / key schedule creation requires this number and not $key_size. We could
  238. * derive this from $key_size or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu
  239. * of that, we'll just precompute it once.
  240. */
  241. var $key_size = 16;
  242. /**
  243. * The Key Length divided by 32
  244. *
  245. * @see setKeyLength()
  246. * @var Integer
  247. * @access private
  248. * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4
  249. */
  250. var $Nk = 4;
  251. /**
  252. * The Number of Rounds
  253. *
  254. * @var Integer
  255. * @access private
  256. * @internal The max value is 14, the min value is 10.
  257. */
  258. var $Nr;
  259. /**
  260. * Shift offsets
  261. *
  262. * @var Array
  263. * @access private
  264. */
  265. var $c;
  266. /**
  267. * Precomputed mixColumns table
  268. *
  269. * @see Crypt_Rijndael()
  270. * @var Array
  271. * @access private
  272. */
  273. var $t0;
  274. /**
  275. * Precomputed mixColumns table
  276. *
  277. * @see Crypt_Rijndael()
  278. * @var Array
  279. * @access private
  280. */
  281. var $t1;
  282. /**
  283. * Precomputed mixColumns table
  284. *
  285. * @see Crypt_Rijndael()
  286. * @var Array
  287. * @access private
  288. */
  289. var $t2;
  290. /**
  291. * Precomputed mixColumns table
  292. *
  293. * @see Crypt_Rijndael()
  294. * @var Array
  295. * @access private
  296. */
  297. var $t3;
  298. /**
  299. * Precomputed invMixColumns table
  300. *
  301. * @see Crypt_Rijndael()
  302. * @var Array
  303. * @access private
  304. */
  305. var $dt0;
  306. /**
  307. * Precomputed invMixColumns table
  308. *
  309. * @see Crypt_Rijndael()
  310. * @var Array
  311. * @access private
  312. */
  313. var $dt1;
  314. /**
  315. * Precomputed invMixColumns table
  316. *
  317. * @see Crypt_Rijndael()
  318. * @var Array
  319. * @access private
  320. */
  321. var $dt2;
  322. /**
  323. * Precomputed invMixColumns table
  324. *
  325. * @see Crypt_Rijndael()
  326. * @var Array
  327. * @access private
  328. */
  329. var $dt3;
  330. /**
  331. * Default Constructor.
  332. *
  333. * Determines whether or not the mcrypt extension should be used. $mode should only, at present, be
  334. * CRYPT_RIJNDAEL_MODE_ECB or CRYPT_RIJNDAEL_MODE_CBC. If not explictly set, CRYPT_RIJNDAEL_MODE_CBC will be used.
  335. *
  336. * @param optional Integer $mode
  337. * @return Crypt_Rijndael
  338. * @access public
  339. */
  340. function Crypt_Rijndael($mode = CRYPT_RIJNDAEL_MODE_CBC)
  341. {
  342. switch ($mode) {
  343. case CRYPT_RIJNDAEL_MODE_ECB:
  344. case CRYPT_RIJNDAEL_MODE_CBC:
  345. case CRYPT_RIJNDAEL_MODE_CTR:
  346. $this->mode = $mode;
  347. break;
  348. default:
  349. $this->mode = CRYPT_RIJNDAEL_MODE_CBC;
  350. }
  351. $t3 = &$this->t3;
  352. $t2 = &$this->t2;
  353. $t1 = &$this->t1;
  354. $t0 = &$this->t0;
  355. $dt3 = &$this->dt3;
  356. $dt2 = &$this->dt2;
  357. $dt1 = &$this->dt1;
  358. $dt0 = &$this->dt0;
  359. // according to <http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=19> (section 5.2.1),
  360. // precomputed tables can be used in the mixColumns phase. in that example, they're assigned t0...t3, so
  361. // those are the names we'll use.
  362. $t3 = array(
  363. 0x6363A5C6, 0x7C7C84F8, 0x777799EE, 0x7B7B8DF6, 0xF2F20DFF, 0x6B6BBDD6, 0x6F6FB1DE, 0xC5C55491,
  364. 0x30305060, 0x01010302, 0x6767A9CE, 0x2B2B7D56, 0xFEFE19E7, 0xD7D762B5, 0xABABE64D, 0x76769AEC,
  365. 0xCACA458F, 0x82829D1F, 0xC9C94089, 0x7D7D87FA, 0xFAFA15EF, 0x5959EBB2, 0x4747C98E, 0xF0F00BFB,
  366. 0xADADEC41, 0xD4D467B3, 0xA2A2FD5F, 0xAFAFEA45, 0x9C9CBF23, 0xA4A4F753, 0x727296E4, 0xC0C05B9B,
  367. 0xB7B7C275, 0xFDFD1CE1, 0x9393AE3D, 0x26266A4C, 0x36365A6C, 0x3F3F417E, 0xF7F702F5, 0xCCCC4F83,
  368. 0x34345C68, 0xA5A5F451, 0xE5E534D1, 0xF1F108F9, 0x717193E2, 0xD8D873AB, 0x31315362, 0x15153F2A,
  369. 0x04040C08, 0xC7C75295, 0x23236546, 0xC3C35E9D, 0x18182830, 0x9696A137, 0x05050F0A, 0x9A9AB52F,
  370. 0x0707090E, 0x12123624, 0x80809B1B, 0xE2E23DDF, 0xEBEB26CD, 0x2727694E, 0xB2B2CD7F, 0x75759FEA,
  371. 0x09091B12, 0x83839E1D, 0x2C2C7458, 0x1A1A2E34, 0x1B1B2D36, 0x6E6EB2DC, 0x5A5AEEB4, 0xA0A0FB5B,
  372. 0x5252F6A4, 0x3B3B4D76, 0xD6D661B7, 0xB3B3CE7D, 0x29297B52, 0xE3E33EDD, 0x2F2F715E, 0x84849713,
  373. 0x5353F5A6, 0xD1D168B9, 0x00000000, 0xEDED2CC1, 0x20206040, 0xFCFC1FE3, 0xB1B1C879, 0x5B5BEDB6,
  374. 0x6A6ABED4, 0xCBCB468D, 0xBEBED967, 0x39394B72, 0x4A4ADE94, 0x4C4CD498, 0x5858E8B0, 0xCFCF4A85,
  375. 0xD0D06BBB, 0xEFEF2AC5, 0xAAAAE54F, 0xFBFB16ED, 0x4343C586, 0x4D4DD79A, 0x33335566, 0x85859411,
  376. 0x4545CF8A, 0xF9F910E9, 0x02020604, 0x7F7F81FE, 0x5050F0A0, 0x3C3C4478, 0x9F9FBA25, 0xA8A8E34B,
  377. 0x5151F3A2, 0xA3A3FE5D, 0x4040C080, 0x8F8F8A05, 0x9292AD3F, 0x9D9DBC21, 0x38384870, 0xF5F504F1,
  378. 0xBCBCDF63, 0xB6B6C177, 0xDADA75AF, 0x21216342, 0x10103020, 0xFFFF1AE5, 0xF3F30EFD, 0xD2D26DBF,
  379. 0xCDCD4C81, 0x0C0C1418, 0x13133526, 0xECEC2FC3, 0x5F5FE1BE, 0x9797A235, 0x4444CC88, 0x1717392E,
  380. 0xC4C45793, 0xA7A7F255, 0x7E7E82FC, 0x3D3D477A, 0x6464ACC8, 0x5D5DE7BA, 0x19192B32, 0x737395E6,
  381. 0x6060A0C0, 0x81819819, 0x4F4FD19E, 0xDCDC7FA3, 0x22226644, 0x2A2A7E54, 0x9090AB3B, 0x8888830B,
  382. 0x4646CA8C, 0xEEEE29C7, 0xB8B8D36B, 0x14143C28, 0xDEDE79A7, 0x5E5EE2BC, 0x0B0B1D16, 0xDBDB76AD,
  383. 0xE0E03BDB, 0x32325664, 0x3A3A4E74, 0x0A0A1E14, 0x4949DB92, 0x06060A0C, 0x24246C48, 0x5C5CE4B8,
  384. 0xC2C25D9F, 0xD3D36EBD, 0xACACEF43, 0x6262A6C4, 0x9191A839, 0x9595A431, 0xE4E437D3, 0x79798BF2,
  385. 0xE7E732D5, 0xC8C8438B, 0x3737596E, 0x6D6DB7DA, 0x8D8D8C01, 0xD5D564B1, 0x4E4ED29C, 0xA9A9E049,
  386. 0x6C6CB4D8, 0x5656FAAC, 0xF4F407F3, 0xEAEA25CF, 0x6565AFCA, 0x7A7A8EF4, 0xAEAEE947, 0x08081810,
  387. 0xBABAD56F, 0x787888F0, 0x25256F4A, 0x2E2E725C, 0x1C1C2438, 0xA6A6F157, 0xB4B4C773, 0xC6C65197,
  388. 0xE8E823CB, 0xDDDD7CA1, 0x74749CE8, 0x1F1F213E, 0x4B4BDD96, 0xBDBDDC61, 0x8B8B860D, 0x8A8A850F,
  389. 0x707090E0, 0x3E3E427C, 0xB5B5C471, 0x6666AACC, 0x4848D890, 0x03030506, 0xF6F601F7, 0x0E0E121C,
  390. 0x6161A3C2, 0x35355F6A, 0x5757F9AE, 0xB9B9D069, 0x86869117, 0xC1C15899, 0x1D1D273A, 0x9E9EB927,
  391. 0xE1E138D9, 0xF8F813EB, 0x9898B32B, 0x11113322, 0x6969BBD2, 0xD9D970A9, 0x8E8E8907, 0x9494A733,
  392. 0x9B9BB62D, 0x1E1E223C, 0x87879215, 0xE9E920C9, 0xCECE4987, 0x5555FFAA, 0x28287850, 0xDFDF7AA5,
  393. 0x8C8C8F03, 0xA1A1F859, 0x89898009, 0x0D0D171A, 0xBFBFDA65, 0xE6E631D7, 0x4242C684, 0x6868B8D0,
  394. 0x4141C382, 0x9999B029, 0x2D2D775A, 0x0F0F111E, 0xB0B0CB7B, 0x5454FCA8, 0xBBBBD66D, 0x16163A2C
  395. );
  396. $dt3 = array(
  397. 0xF4A75051, 0x4165537E, 0x17A4C31A, 0x275E963A, 0xAB6BCB3B, 0x9D45F11F, 0xFA58ABAC, 0xE303934B,
  398. 0x30FA5520, 0x766DF6AD, 0xCC769188, 0x024C25F5, 0xE5D7FC4F, 0x2ACBD7C5, 0x35448026, 0x62A38FB5,
  399. 0xB15A49DE, 0xBA1B6725, 0xEA0E9845, 0xFEC0E15D, 0x2F7502C3, 0x4CF01281, 0x4697A38D, 0xD3F9C66B,
  400. 0x8F5FE703, 0x929C9515, 0x6D7AEBBF, 0x5259DA95, 0xBE832DD4, 0x7421D358, 0xE0692949, 0xC9C8448E,
  401. 0xC2896A75, 0x8E7978F4, 0x583E6B99, 0xB971DD27, 0xE14FB6BE, 0x88AD17F0, 0x20AC66C9, 0xCE3AB47D,
  402. 0xDF4A1863, 0x1A3182E5, 0x51336097, 0x537F4562, 0x6477E0B1, 0x6BAE84BB, 0x81A01CFE, 0x082B94F9,
  403. 0x48685870, 0x45FD198F, 0xDE6C8794, 0x7BF8B752, 0x73D323AB, 0x4B02E272, 0x1F8F57E3, 0x55AB2A66,
  404. 0xEB2807B2, 0xB5C2032F, 0xC57B9A86, 0x3708A5D3, 0x2887F230, 0xBFA5B223, 0x036ABA02, 0x16825CED,
  405. 0xCF1C2B8A, 0x79B492A7, 0x07F2F0F3, 0x69E2A14E, 0xDAF4CD65, 0x05BED506, 0x34621FD1, 0xA6FE8AC4,
  406. 0x2E539D34, 0xF355A0A2, 0x8AE13205, 0xF6EB75A4, 0x83EC390B, 0x60EFAA40, 0x719F065E, 0x6E1051BD,
  407. 0x218AF93E, 0xDD063D96, 0x3E05AEDD, 0xE6BD464D, 0x548DB591, 0xC45D0571, 0x06D46F04, 0x5015FF60,
  408. 0x98FB2419, 0xBDE997D6, 0x4043CC89, 0xD99E7767, 0xE842BDB0, 0x898B8807, 0x195B38E7, 0xC8EEDB79,
  409. 0x7C0A47A1, 0x420FE97C, 0x841EC9F8, 0x00000000, 0x80868309, 0x2BED4832, 0x1170AC1E, 0x5A724E6C,
  410. 0x0EFFFBFD, 0x8538560F, 0xAED51E3D, 0x2D392736, 0x0FD9640A, 0x5CA62168, 0x5B54D19B, 0x362E3A24,
  411. 0x0A67B10C, 0x57E70F93, 0xEE96D2B4, 0x9B919E1B, 0xC0C54F80, 0xDC20A261, 0x774B695A, 0x121A161C,
  412. 0x93BA0AE2, 0xA02AE5C0, 0x22E0433C, 0x1B171D12, 0x090D0B0E, 0x8BC7ADF2, 0xB6A8B92D, 0x1EA9C814,
  413. 0xF1198557, 0x75074CAF, 0x99DDBBEE, 0x7F60FDA3, 0x01269FF7, 0x72F5BC5C, 0x663BC544, 0xFB7E345B,
  414. 0x4329768B, 0x23C6DCCB, 0xEDFC68B6, 0xE4F163B8, 0x31DCCAD7, 0x63851042, 0x97224013, 0xC6112084,
  415. 0x4A247D85, 0xBB3DF8D2, 0xF93211AE, 0x29A16DC7, 0x9E2F4B1D, 0xB230F3DC, 0x8652EC0D, 0xC1E3D077,
  416. 0xB3166C2B, 0x70B999A9, 0x9448FA11, 0xE9642247, 0xFC8CC4A8, 0xF03F1AA0, 0x7D2CD856, 0x3390EF22,
  417. 0x494EC787, 0x38D1C1D9, 0xCAA2FE8C, 0xD40B3698, 0xF581CFA6, 0x7ADE28A5, 0xB78E26DA, 0xADBFA43F,
  418. 0x3A9DE42C, 0x78920D50, 0x5FCC9B6A, 0x7E466254, 0x8D13C2F6, 0xD8B8E890, 0x39F75E2E, 0xC3AFF582,
  419. 0x5D80BE9F, 0xD0937C69, 0xD52DA96F, 0x2512B3CF, 0xAC993BC8, 0x187DA710, 0x9C636EE8, 0x3BBB7BDB,
  420. 0x267809CD, 0x5918F46E, 0x9AB701EC, 0x4F9AA883, 0x956E65E6, 0xFFE67EAA, 0xBCCF0821, 0x15E8E6EF,
  421. 0xE79BD9BA, 0x6F36CE4A, 0x9F09D4EA, 0xB07CD629, 0xA4B2AF31, 0x3F23312A, 0xA59430C6, 0xA266C035,
  422. 0x4EBC3774, 0x82CAA6FC, 0x90D0B0E0, 0xA7D81533, 0x04984AF1, 0xECDAF741, 0xCD500E7F, 0x91F62F17,
  423. 0x4DD68D76, 0xEFB04D43, 0xAA4D54CC, 0x9604DFE4, 0xD1B5E39E, 0x6A881B4C, 0x2C1FB8C1, 0x65517F46,
  424. 0x5EEA049D, 0x8C355D01, 0x877473FA, 0x0B412EFB, 0x671D5AB3, 0xDBD25292, 0x105633E9, 0xD647136D,
  425. 0xD7618C9A, 0xA10C7A37, 0xF8148E59, 0x133C89EB, 0xA927EECE, 0x61C935B7, 0x1CE5EDE1, 0x47B13C7A,
  426. 0xD2DF599C, 0xF2733F55, 0x14CE7918, 0xC737BF73, 0xF7CDEA53, 0xFDAA5B5F, 0x3D6F14DF, 0x44DB8678,
  427. 0xAFF381CA, 0x68C43EB9, 0x24342C38, 0xA3405FC2, 0x1DC37216, 0xE2250CBC, 0x3C498B28, 0x0D9541FF,
  428. 0xA8017139, 0x0CB3DE08, 0xB4E49CD8, 0x56C19064, 0xCB84617B, 0x32B670D5, 0x6C5C7448, 0xB85742D0
  429. );
  430. for ($i = 0; $i < 256; $i++) {
  431. $t2[$i << 8] = (($t3[$i] << 8) & 0xFFFFFF00) | (($t3[$i] >> 24) & 0x000000FF);
  432. $t1[$i << 16] = (($t3[$i] << 16) & 0xFFFF0000) | (($t3[$i] >> 16) & 0x0000FFFF);
  433. $t0[$i << 24] = (($t3[$i] << 24) & 0xFF000000) | (($t3[$i] >> 8) & 0x00FFFFFF);
  434. $dt2[$i << 8] = (($this->dt3[$i] << 8) & 0xFFFFFF00) | (($dt3[$i] >> 24) & 0x000000FF);
  435. $dt1[$i << 16] = (($this->dt3[$i] << 16) & 0xFFFF0000) | (($dt3[$i] >> 16) & 0x0000FFFF);
  436. $dt0[$i << 24] = (($this->dt3[$i] << 24) & 0xFF000000) | (($dt3[$i] >> 8) & 0x00FFFFFF);
  437. }
  438. }
  439. /**
  440. * Sets the key.
  441. *
  442. * Keys can be of any length. Rijndael, itself, requires the use of a key that's between 128-bits and 256-bits long and
  443. * whose length is a multiple of 32. If the key is less than 256-bits and the key length isn't set, we round the length
  444. * up to the closest valid key length, padding $key with null bytes. If the key is more than 256-bits, we trim the
  445. * excess bits.
  446. *
  447. * If the key is not explicitly set, it'll be assumed to be all null bytes.
  448. *
  449. * @access public
  450. * @param String $key
  451. */
  452. function setKey($key)
  453. {
  454. $this->key = $key;
  455. $this->changed = true;
  456. }
  457. /**
  458. * Sets the initialization vector. (optional)
  459. *
  460. * SetIV is not required when CRYPT_RIJNDAEL_MODE_ECB is being used. If not explictly set, it'll be assumed
  461. * to be all zero's.
  462. *
  463. * @access public
  464. * @param String $iv
  465. */
  466. function setIV($iv)
  467. {
  468. $this->encryptIV = $this->decryptIV = $this->iv = str_pad(substr($iv, 0, $this->block_size), $this->block_size, chr(0));;
  469. }
  470. /**
  471. * Sets the key length
  472. *
  473. * Valid key lengths are 128, 160, 192, 224, and 256. If the length is less than 128, it will be rounded up to
  474. * 128. If the length is greater then 128 and invalid, it will be rounded down to the closest valid amount.
  475. *
  476. * @access public
  477. * @param Integer $length
  478. */
  479. function setKeyLength($length)
  480. {
  481. $length >>= 5;
  482. if ($length > 8) {
  483. $length = 8;
  484. } else if ($length < 4) {
  485. $length = 4;
  486. }
  487. $this->Nk = $length;
  488. $this->key_size = $length << 2;
  489. $this->explicit_key_length = true;
  490. $this->changed = true;
  491. }
  492. /**
  493. * Sets the block length
  494. *
  495. * Valid block lengths are 128, 160, 192, 224, and 256. If the length is less than 128, it will be rounded up to
  496. * 128. If the length is greater then 128 and invalid, it will be rounded down to the closest valid amount.
  497. *
  498. * @access public
  499. * @param Integer $length
  500. */
  501. function setBlockLength($length)
  502. {
  503. $length >>= 5;
  504. if ($length > 8) {
  505. $length = 8;
  506. } else if ($length < 4) {
  507. $length = 4;
  508. }
  509. $this->Nb = $length;
  510. $this->block_size = $length << 2;
  511. $this->changed = true;
  512. }
  513. /**
  514. * Generate CTR XOR encryption key
  515. *
  516. * Encrypt the output of this and XOR it against the ciphertext / plaintext to get the
  517. * plaintext / ciphertext in CTR mode.
  518. *
  519. * @see Crypt_Rijndael::decrypt()
  520. * @see Crypt_Rijndael::encrypt()
  521. * @access public
  522. * @param Integer $length
  523. * @param String $iv
  524. */
  525. function _generate_xor($length, &$iv)
  526. {
  527. $xor = '';
  528. $block_size = $this->block_size;
  529. $num_blocks = floor(($length + ($block_size - 1)) / $block_size);
  530. for ($i = 0; $i < $num_blocks; $i++) {
  531. $xor.= $iv;
  532. for ($j = 4; $j <= $block_size; $j+=4) {
  533. $temp = substr($iv, -$j, 4);
  534. switch ($temp) {
  535. case "\xFF\xFF\xFF\xFF":
  536. $iv = substr_replace($iv, "\x00\x00\x00\x00", -$j, 4);
  537. break;
  538. case "\x7F\xFF\xFF\xFF":
  539. $iv = substr_replace($iv, "\x80\x00\x00\x00", -$j, 4);
  540. break 2;
  541. default:
  542. extract(unpack('Ncount', $temp));
  543. $iv = substr_replace($iv, pack('N', $count + 1), -$j, 4);
  544. break 2;
  545. }
  546. }
  547. }
  548. return $xor;
  549. }
  550. /**
  551. * Encrypts a message.
  552. *
  553. * $plaintext will be padded with additional bytes such that it's length is a multiple of the block size. Other Rjindael
  554. * implementations may or may not pad in the same manner. Other common approaches to padding and the reasons why it's
  555. * necessary are discussed in the following
  556. * URL:
  557. *
  558. * {@link http://www.di-mgt.com.au/cryptopad.html http://www.di-mgt.com.au/cryptopad.html}
  559. *
  560. * An alternative to padding is to, separately, send the length of the file. This is what SSH, in fact, does.
  561. * strlen($plaintext) will still need to be a multiple of 8, however, arbitrary values can be added to make it that
  562. * length.
  563. *
  564. * @see Crypt_Rijndael::decrypt()
  565. * @access public
  566. * @param String $plaintext
  567. */
  568. function encrypt($plaintext)
  569. {
  570. $this->_setup();
  571. if ($this->mode != CRYPT_RIJNDAEL_MODE_CTR) {
  572. $plaintext = $this->_pad($plaintext);
  573. }
  574. $block_size = $this->block_size;
  575. $ciphertext = '';
  576. switch ($this->mode) {
  577. case CRYPT_RIJNDAEL_MODE_ECB:
  578. for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
  579. $ciphertext.= $this->_encryptBlock(substr($plaintext, $i, $block_size));
  580. }
  581. break;
  582. case CRYPT_RIJNDAEL_MODE_CBC:
  583. $xor = $this->encryptIV;
  584. for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
  585. $block = substr($plaintext, $i, $block_size);
  586. $block = $this->_encryptBlock($block ^ $xor);
  587. $xor = $block;
  588. $ciphertext.= $block;
  589. }
  590. if ($this->continuousBuffer) {
  591. $this->encryptIV = $xor;
  592. }
  593. break;
  594. case CRYPT_RIJNDAEL_MODE_CTR:
  595. $xor = $this->encryptIV;
  596. for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
  597. $block = substr($plaintext, $i, $block_size);
  598. $key = $this->_encryptBlock($this->_generate_xor($block_size, $xor));
  599. $ciphertext.= $block ^ $key;
  600. }
  601. if ($this->continuousBuffer) {
  602. $this->encryptIV = $xor;
  603. }
  604. }
  605. return $ciphertext;
  606. }
  607. /**
  608. * Decrypts a message.
  609. *
  610. * If strlen($ciphertext) is not a multiple of the block size, null bytes will be added to the end of the string until
  611. * it is.
  612. *
  613. * @see Crypt_Rijndael::encrypt()
  614. * @access public
  615. * @param String $ciphertext
  616. */
  617. function decrypt($ciphertext)
  618. {
  619. $this->_setup();
  620. if ($this->mode != CRYPT_RIJNDAEL_MODE_CTR) {
  621. // we pad with chr(0) since that's what mcrypt_generic does. to quote from http://php.net/function.mcrypt-generic :
  622. // "The data is padded with "\0" to make sure the length of the data is n * blocksize."
  623. $ciphertext = str_pad($ciphertext, (strlen($ciphertext) + $this->block_size - 1) % $this->block_size, chr(0));
  624. }
  625. $block_size = $this->block_size;
  626. $plaintext = '';
  627. switch ($this->mode) {
  628. case CRYPT_RIJNDAEL_MODE_ECB:
  629. for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
  630. $plaintext.= $this->_decryptBlock(substr($ciphertext, $i, $block_size));
  631. }
  632. break;
  633. case CRYPT_RIJNDAEL_MODE_CBC:
  634. $xor = $this->decryptIV;
  635. for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
  636. $block = substr($ciphertext, $i, $block_size);
  637. $plaintext.= $this->_decryptBlock($block) ^ $xor;
  638. $xor = $block;
  639. }
  640. if ($this->continuousBuffer) {
  641. $this->decryptIV = $xor;
  642. }
  643. break;
  644. case CRYPT_RIJNDAEL_MODE_CTR:
  645. $xor = $this->decryptIV;
  646. for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
  647. $block = substr($ciphertext, $i, $block_size);
  648. $key = $this->_encryptBlock($this->_generate_xor($block_size, $xor));
  649. $plaintext.= $block ^ $key;
  650. }
  651. if ($this->continuousBuffer) {
  652. $this->decryptIV = $xor;
  653. }
  654. }
  655. return $this->mode != CRYPT_RIJNDAEL_MODE_CTR ? $this->_unpad($plaintext) : $plaintext;
  656. }
  657. /**
  658. * Encrypts a block
  659. *
  660. * @access private
  661. * @param String $in
  662. * @return String
  663. */
  664. function _encryptBlock($in)
  665. {
  666. $state = array();
  667. $words = unpack('N*word', $in);
  668. $w = $this->w;
  669. $t0 = $this->t0;
  670. $t1 = $this->t1;
  671. $t2 = $this->t2;
  672. $t3 = $this->t3;
  673. $Nb = $this->Nb;
  674. $Nr = $this->Nr;
  675. $c = $this->c;
  676. // addRoundKey
  677. $i = 0;
  678. foreach ($words as $word) {
  679. $state[] = $word ^ $w[0][$i++];
  680. }
  681. // fips-197.pdf#page=19, "Figure 5. Pseudo Code for the Cipher", states that this loop has four components -
  682. // subBytes, shiftRows, mixColumns, and addRoundKey. fips-197.pdf#page=30, "Implementation Suggestions Regarding
  683. // Various Platforms" suggests that performs enhanced implementations are described in Rijndael-ammended.pdf.
  684. // Rijndael-ammended.pdf#page=20, "Implementation aspects / 32-bit processor", discusses such an optimization.
  685. // Unfortunately, the description given there is not quite correct. Per aes.spec.v316.pdf#page=19 [1],
  686. // equation (7.4.7) is supposed to use addition instead of subtraction, so we'll do that here, as well.
  687. // [1] http://fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.v316.pdf
  688. $temp = array();
  689. for ($round = 1; $round < $Nr; $round++) {
  690. $i = 0; // $c[0] == 0
  691. $j = $c[1];
  692. $k = $c[2];
  693. $l = $c[3];
  694. while ($i < $this->Nb) {
  695. $temp[$i] = $t0[$state[$i] & 0xFF000000] ^
  696. $t1[$state[$j] & 0x00FF0000] ^
  697. $t2[$state[$k] & 0x0000FF00] ^
  698. $t3[$state[$l] & 0x000000FF] ^
  699. $w[$round][$i];
  700. $i++;
  701. $j = ($j + 1) % $Nb;
  702. $k = ($k + 1) % $Nb;
  703. $l = ($l + 1) % $Nb;
  704. }
  705. for ($i = 0; $i < $Nb; $i++) {
  706. $state[$i] = $temp[$i];
  707. }
  708. }
  709. // subWord
  710. for ($i = 0; $i < $Nb; $i++) {
  711. $state[$i] = $this->_subWord($state[$i]);
  712. }
  713. // shiftRows + addRoundKey
  714. $i = 0; // $c[0] == 0
  715. $j = $c[1];
  716. $k = $c[2];
  717. $l = $c[3];
  718. while ($i < $this->Nb) {
  719. $temp[$i] = ($state[$i] & 0xFF000000) ^
  720. ($state[$j] & 0x00FF0000) ^
  721. ($state[$k] & 0x0000FF00) ^
  722. ($state[$l] & 0x000000FF) ^
  723. $w[$Nr][$i];
  724. $i++;
  725. $j = ($j + 1) % $Nb;
  726. $k = ($k + 1) % $Nb;
  727. $l = ($l + 1) % $Nb;
  728. }
  729. $state = $temp;
  730. array_unshift($state, 'N*');
  731. return call_user_func_array('pack', $state);
  732. }
  733. /**
  734. * Decrypts a block
  735. *
  736. * @access private
  737. * @param String $in
  738. * @return String
  739. */
  740. function _decryptBlock($in)
  741. {
  742. $state = array();
  743. $words = unpack('N*word', $in);
  744. $num_states = count($state);
  745. $dw = $this->dw;
  746. $dt0 = $this->dt0;
  747. $dt1 = $this->dt1;
  748. $dt2 = $this->dt2;
  749. $dt3 = $this->dt3;
  750. $Nb = $this->Nb;
  751. $Nr = $this->Nr;
  752. $c = $this->c;
  753. // addRoundKey
  754. $i = 0;
  755. foreach ($words as $word) {
  756. $state[] = $word ^ $dw[$Nr][$i++];
  757. }
  758. $temp = array();
  759. for ($round = $Nr - 1; $round > 0; $round--) {
  760. $i = 0; // $c[0] == 0
  761. $j = $Nb - $c[1];
  762. $k = $Nb - $c[2];
  763. $l = $Nb - $c[3];
  764. while ($i < $Nb) {
  765. $temp[$i] = $dt0[$state[$i] & 0xFF000000] ^
  766. $dt1[$state[$j] & 0x00FF0000] ^
  767. $dt2[$state[$k] & 0x0000FF00] ^
  768. $dt3[$state[$l] & 0x000000FF] ^
  769. $dw[$round][$i];
  770. $i++;
  771. $j = ($j + 1) % $Nb;
  772. $k = ($k + 1) % $Nb;
  773. $l = ($l + 1) % $Nb;
  774. }
  775. for ($i = 0; $i < $Nb; $i++) {
  776. $state[$i] = $temp[$i];
  777. }
  778. }
  779. // invShiftRows + invSubWord + addRoundKey
  780. $i = 0; // $c[0] == 0
  781. $j = $Nb - $c[1];
  782. $k = $Nb - $c[2];
  783. $l = $Nb - $c[3];
  784. while ($i < $Nb) {
  785. $temp[$i] = $dw[0][$i] ^
  786. $this->_invSubWord(($state[$i] & 0xFF000000) |
  787. ($state[$j] & 0x00FF0000) |
  788. ($state[$k] & 0x0000FF00) |
  789. ($state[$l] & 0x000000FF));
  790. $i++;
  791. $j = ($j + 1) % $Nb;
  792. $k = ($k + 1) % $Nb;
  793. $l = ($l + 1) % $Nb;
  794. }
  795. $state = $temp;
  796. array_unshift($state, 'N*');
  797. return call_user_func_array('pack', $state);
  798. }
  799. /**
  800. * Setup Rijndael
  801. *
  802. * Validates all the variables and calculates $Nr - the number of rounds that need to be performed - and $w - the key
  803. * key schedule.
  804. *
  805. * @access private
  806. */
  807. function _setup()
  808. {
  809. // Each number in $rcon is equal to the previous number multiplied by two in Rijndael's finite field.
  810. // See http://en.wikipedia.org/wiki/Finite_field_arithmetic#Multiplicative_inverse
  811. static $rcon = array(0,
  812. 0x01000000, 0x02000000, 0x04000000, 0x08000000, 0x10000000,
  813. 0x20000000, 0x40000000, 0x80000000, 0x1B000000, 0x36000000,
  814. 0x6C000000, 0xD8000000, 0xAB000000, 0x4D000000, 0x9A000000,
  815. 0x2F000000, 0x5E000000, 0xBC000000, 0x63000000, 0xC6000000,
  816. 0x97000000, 0x35000000, 0x6A000000, 0xD4000000, 0xB3000000,
  817. 0x7D000000, 0xFA000000, 0xEF000000, 0xC5000000, 0x91000000
  818. );
  819. if (!$this->changed) {
  820. return;
  821. }
  822. if (!$this->explicit_key_length) {
  823. // we do >> 2, here, and not >> 5, as we do above, since strlen($this->key) tells us the number of bytes - not bits
  824. $length = strlen($this->key) >> 2;
  825. if ($length > 8) {
  826. $length = 8;
  827. } else if ($length < 4) {
  828. $length = 4;
  829. }
  830. $this->Nk = $length;
  831. $this->key_size = $length << 2;
  832. }
  833. $this->key = str_pad(substr($this->key, 0, $this->key_size), $this->key_size, chr(0));
  834. $this->encryptIV = $this->decryptIV = $this->iv = str_pad(substr($this->iv, 0, $this->block_size), $this->block_size, chr(0));
  835. // see Rijndael-ammended.pdf#page=44
  836. $this->Nr = max($this->Nk, $this->Nb) + 6;
  837. // shift offsets for Nb = 5, 7 are defined in Rijndael-ammended.pdf#page=44,
  838. // "Table 8: Shift offsets in Shiftrow for the alternative block lengths"
  839. // shift offsets for Nb = 4, 6, 8 are defined in Rijndael-ammended.pdf#page=14,
  840. // "Table 2: Shift offsets for different block lengths"
  841. switch ($this->Nb) {
  842. case 4:
  843. case 5:
  844. case 6:
  845. $this->c = array(0, 1, 2, 3);
  846. break;
  847. case 7:
  848. $this->c = array(0, 1, 2, 4);
  849. break;
  850. case 8:
  851. $this->c = array(0, 1, 3, 4);
  852. }
  853. $key = $this->key;
  854. $w = array_values(unpack('N*words', $key));
  855. $length = $this->Nb * ($this->Nr + 1);
  856. for ($i = $this->Nk; $i < $length; $i++) {
  857. $temp = $w[$i - 1];
  858. if ($i % $this->Nk == 0) {
  859. // according to <http://php.net/language.types.integer>, "the size of an integer is platform-dependent".
  860. // on a 32-bit machine, it's 32-bits, and on a 64-bit machine, it's 64-bits. on a 32-bit machine,
  861. // 0xFFFFFFFF << 8 == 0xFFFFFF00, but on a 64-bit machine, it equals 0xFFFFFFFF00. as such, doing 'and'
  862. // with 0xFFFFFFFF (or 0xFFFFFF00) on a 32-bit machine is unnecessary, but on a 64-bit machine, it is.
  863. $temp = (($temp << 8) & 0xFFFFFF00) | (($temp >> 24) & 0x000000FF); // rotWord
  864. $temp = $this->_subWord($temp) ^ $rcon[$i / $this->Nk];
  865. } else if ($this->Nk > 6 && $i % $this->Nk == 4) {
  866. $temp = $this->_subWord($temp);
  867. }
  868. $w[$i] = $w[$i - $this->Nk] ^ $temp;
  869. }
  870. // convert the key schedule from a vector of $Nb * ($Nr + 1) length to a matrix with $Nr + 1 rows and $Nb columns
  871. // and generate the inverse key schedule. more specifically,
  872. // according to <http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=23> (section 5.3.3),
  873. // "The key expansion for the Inverse Cipher is defined as follows:
  874. // 1. Apply the Key Expansion.
  875. // 2. Apply InvMixColumn to all Round Keys except the first and the last one."
  876. // also, see fips-197.pdf#page=27, "5.3.5 Equivalent Inverse Cipher"
  877. $temp = array();
  878. for ($i = $row = $col = 0; $i < $length; $i++, $col++) {
  879. if ($col == $this->Nb) {
  880. if ($row == 0) {
  881. $this->dw[0] = $this->w[0];
  882. } else {
  883. // subWord + invMixColumn + invSubWord = invMixColumn
  884. $j = 0;
  885. while ($j < $this->Nb) {
  886. $dw = $this->_subWord($this->w[$row][$j]);
  887. $temp[$j] = $this->dt0[$dw & 0xFF000000] ^
  888. $this->dt1[$dw & 0x00FF0000] ^
  889. $this->dt2[$dw & 0x0000FF00] ^
  890. $this->dt3[$dw & 0x000000FF];
  891. $j++;
  892. }
  893. $this->dw[$row] = $temp;
  894. }
  895. $col = 0;
  896. $row++;
  897. }
  898. $this->w[$row][$col] = $w[$i];
  899. }
  900. $this->dw[$row] = $this->w[$row];
  901. $this->changed = false;
  902. }
  903. /**
  904. * Performs S-Box substitutions
  905. *
  906. * @access private
  907. */
  908. function _subWord($word)
  909. {
  910. static $sbox0, $sbox1, $sbox2, $sbox3;
  911. if (empty($sbox0)) {
  912. $sbox0 = array(
  913. 0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
  914. 0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
  915. 0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
  916. 0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
  917. 0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
  918. 0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
  919. 0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
  920. 0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
  921. 0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
  922. 0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
  923. 0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
  924. 0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
  925. 0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
  926. 0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
  927. 0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
  928. 0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
  929. );
  930. $sbox1 = array();
  931. $sbox2 = array();
  932. $sbox3 = array();
  933. for ($i = 0; $i < 256; $i++) {
  934. $sbox1[$i << 8] = $sbox0[$i] << 8;
  935. $sbox2[$i << 16] = $sbox0[$i] << 16;
  936. $sbox3[$i << 24] = $sbox0[$i] << 24;
  937. }
  938. }
  939. return $sbox0[$word & 0x000000FF] |
  940. $sbox1[$word & 0x0000FF00] |
  941. $sbox2[$word & 0x00FF0000] |
  942. $sbox3[$word & 0xFF000000];
  943. }
  944. /**
  945. * Performs inverse S-Box substitutions
  946. *
  947. * @access private
  948. */
  949. function _invSubWord($word)
  950. {
  951. static $sbox0, $sbox1, $sbox2, $sbox3;
  952. if (empty($sbox0)) {
  953. $sbox0 = array(
  954. 0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
  955. 0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
  956. 0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
  957. 0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
  958. 0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
  959. 0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
  960. 0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
  961. 0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
  962. 0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
  963. 0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
  964. 0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
  965. 0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
  966. 0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
  967. 0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
  968. 0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
  969. 0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D
  970. );
  971. $sbox1 = array();
  972. $sbox2 = array();
  973. $sbox3 = array();
  974. for ($i = 0; $i < 256; $i++) {
  975. $sbox1[$i << 8] = $sbox0[$i] << 8;
  976. $sbox2[$i << 16] = $sbox0[$i] << 16;
  977. $sbox3[$i << 24] = $sbox0[$i] << 24;
  978. }
  979. }
  980. return $sbox0[$word & 0x000000FF] |
  981. $sbox1[$word & 0x0000FF00] |
  982. $sbox2[$word & 0x00FF0000] |
  983. $sbox3[$word & 0xFF000000];
  984. }
  985. /**
  986. * Pad "packets".
  987. *
  988. * Rijndael works by encrypting between sixteen and thirty-two bytes at a time, provided that number is also a multiple
  989. * of four. If you ever need to encrypt or decrypt something that isn't of the proper length, it becomes necessary to
  990. * pad the input so that it is of the proper length.
  991. *
  992. * Padding is enabled by default. Sometimes, however, it is undesirable to pad strings. Such is the case in SSH,
  993. * where "packets" are padded with random bytes before being encrypted. Unpad these packets and you risk stripping
  994. * away characters that shouldn't be stripped away. (SSH knows how many bytes are added because the length is
  995. * transmitted separately)
  996. *
  997. * @see Crypt_Rijndael::disablePadding()
  998. * @access public
  999. */
  1000. function enablePadding()
  1001. {
  1002. $this->padding = true;
  1003. }
  1004. /**
  1005. * Do not pad packets.
  1006. *
  1007. * @see Crypt_Rijndael::enablePadding()
  1008. * @access public
  1009. */
  1010. function disablePadding()
  1011. {
  1012. $this->padding = false;
  1013. }
  1014. /**
  1015. * Pads a string
  1016. *
  1017. * Pads a string using the RSA PKCS padding standards so that its length is a multiple of the blocksize.
  1018. * $block_size - (strlen($text) % $block_size) bytes are added, each of which is equal to
  1019. * chr($block_size - (strlen($text) % $block_size)
  1020. *
  1021. * If padding is disabled and $text is not a multiple of the blocksize, the string will be padded regardless
  1022. * and padding will, hence forth, be enabled.
  1023. *
  1024. * @see Crypt_Rijndael::_unpad()
  1025. * @access private
  1026. */
  1027. function _pad($text)
  1028. {
  1029. $length = strlen($text);
  1030. if (!$this->padding) {
  1031. if ($length % $this->block_size == 0) {
  1032. return $text;
  1033. } else {
  1034. user_error("The plaintext's length ($length) is not a multiple of the block size ({$this->block_size})", E_USER_NOTICE);
  1035. $this->padding = true;
  1036. }
  1037. }
  1038. $pad = $this->block_size - ($length % $this->block_size);
  1039. return str_pad($text, $length + $pad, chr($pad));
  1040. }
  1041. /**
  1042. * Unpads a string.
  1043. *
  1044. * If padding is enabled and the reported padding length is invalid the encryption key will be assumed to be wrong
  1045. * and false will be returned.
  1046. *
  1047. * @see Crypt_Rijndael::_pad()
  1048. * @access private
  1049. */
  1050. function _unpad($text)
  1051. {
  1052. if (!$this->padding) {
  1053. return $text;
  1054. }
  1055. $length = ord($text[strlen($text) - 1]);
  1056. if (!$length || $length > $this->block_size) {
  1057. return false;
  1058. }
  1059. return substr($text, 0, -$length);
  1060. }
  1061. /**
  1062. * Treat consecutive "packets" as if they are a continuous buffer.
  1063. *
  1064. * Say you have a 32-byte plaintext $plaintext. Using the default behavior, the two following code snippets
  1065. * will yield different outputs:
  1066. *
  1067. * <code>
  1068. * echo $rijndael->encrypt(substr($plaintext, 0, 16));
  1069. * echo $rijndael->encrypt(substr($plaintext, 16, 16));
  1070. * </code>
  1071. * <code>
  1072. * echo $rijndael->encrypt($plaintext);
  1073. * </code>
  1074. *
  1075. * The solution is to enable the continuous buffer. Although this will resolve the above discrepancy, it creates
  1076. * another, as demonstrated with the following:
  1077. *
  1078. * <code>
  1079. * $rijndael->encrypt(substr($plaintext, 0, 16));
  1080. * echo $rijndael->decrypt($des->encrypt(substr($plaintext, 16, 16)));
  1081. * </code>
  1082. * <code>
  1083. * echo $rijndael->decrypt($des->encrypt(substr($plaintext, 16, 16)));
  1084. * </code>
  1085. *
  1086. * With the continuous buffer disabled, these would yield the same output. With it enabled, they yield different
  1087. * outputs. The reason is due to the fact that the initialization vector's change after every encryption /
  1088. * decryption round when the continuous buffer is enabled. When it's disabled, they remain constant.
  1089. *
  1090. * Put another way, when the continuous buffer is enabled, the state of the Crypt_Rijndael() object changes after each
  1091. * encryption / decryption round, whereas otherwise, it'd remain constant. For this reason, it's recommended that
  1092. * continuous buffers not be used. They do offer better security and are, in fact, sometimes required (SSH uses them),
  1093. * however, they are also less intuitive and more likely to cause you problems.
  1094. *
  1095. * @see Crypt_Rijndael::disableContinuousBuffer()
  1096. * @access public
  1097. */
  1098. function enableContinuousBuffer()
  1099. {
  1100. $this->continuousBuffer = true;
  1101. }
  1102. /**
  1103. * Treat consecutive packets as if they are a discontinuous buffer.
  1104. *
  1105. * The default behavior.
  1106. *
  1107. * @see Crypt_Rijndael::enableContinuousBuffer()
  1108. * @access public
  1109. */
  1110. function disableContinuousBuffer()
  1111. {
  1112. $this->continuousBuffer = false;
  1113. $this->encryptIV = $this->iv;
  1114. $this->decryptIV = $this->iv;
  1115. }
  1116. /**
  1117. * String Shift
  1118. *
  1119. * Inspired by array_shift
  1120. *
  1121. * @param String $string
  1122. * @param optional Integer $index
  1123. * @return String
  1124. * @access private
  1125. */
  1126. function _string_shift(&$string, $index = 1)
  1127. {
  1128. $substr = substr($string, 0, $index);
  1129. $string = substr($string, $index);
  1130. return $substr;
  1131. }
  1132. }
  1133. // vim: ts=4:sw=4:et:
  1134. // vim6: fdl=1: