A local copy of OpenSSL from GitHub
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  1. /*
  2. * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
  3. *
  4. * Licensed under the OpenSSL license (the "License"). You may not use
  5. * this file except in compliance with the License. You can obtain a copy
  6. * in the file LICENSE in the source distribution or at
  7. * https://www.openssl.org/source/license.html
  8. */
  9. /*-
  10. * set_key.c v 1.4 eay 24/9/91
  11. * 1.4 Speed up by 400% :-)
  12. * 1.3 added register declarations.
  13. * 1.2 unrolled make_key_sched a bit more
  14. * 1.1 added norm_expand_bits
  15. * 1.0 First working version
  16. */
  17. #include <openssl/crypto.h>
  18. #include "des_locl.h"
  19. OPENSSL_IMPLEMENT_GLOBAL(int, DES_check_key, 0)
  20. /*
  21. * defaults to false
  22. */
  23. static const unsigned char odd_parity[256] = {
  24. 1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14, 14,
  25. 16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
  26. 32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
  27. 49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
  28. 64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
  29. 81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
  30. 97, 97, 98, 98, 100, 100, 103, 103, 104, 104, 107, 107, 109, 109, 110,
  31. 110,
  32. 112, 112, 115, 115, 117, 117, 118, 118, 121, 121, 122, 122, 124, 124, 127,
  33. 127,
  34. 128, 128, 131, 131, 133, 133, 134, 134, 137, 137, 138, 138, 140, 140, 143,
  35. 143,
  36. 145, 145, 146, 146, 148, 148, 151, 151, 152, 152, 155, 155, 157, 157, 158,
  37. 158,
  38. 161, 161, 162, 162, 164, 164, 167, 167, 168, 168, 171, 171, 173, 173, 174,
  39. 174,
  40. 176, 176, 179, 179, 181, 181, 182, 182, 185, 185, 186, 186, 188, 188, 191,
  41. 191,
  42. 193, 193, 194, 194, 196, 196, 199, 199, 200, 200, 203, 203, 205, 205, 206,
  43. 206,
  44. 208, 208, 211, 211, 213, 213, 214, 214, 217, 217, 218, 218, 220, 220, 223,
  45. 223,
  46. 224, 224, 227, 227, 229, 229, 230, 230, 233, 233, 234, 234, 236, 236, 239,
  47. 239,
  48. 241, 241, 242, 242, 244, 244, 247, 247, 248, 248, 251, 251, 253, 253, 254,
  49. 254
  50. };
  51. void DES_set_odd_parity(DES_cblock *key)
  52. {
  53. unsigned int i;
  54. for (i = 0; i < DES_KEY_SZ; i++)
  55. (*key)[i] = odd_parity[(*key)[i]];
  56. }
  57. int DES_check_key_parity(const_DES_cblock *key)
  58. {
  59. unsigned int i;
  60. for (i = 0; i < DES_KEY_SZ; i++) {
  61. if ((*key)[i] != odd_parity[(*key)[i]])
  62. return (0);
  63. }
  64. return (1);
  65. }
  66. /*-
  67. * Weak and semi week keys as take from
  68. * %A D.W. Davies
  69. * %A W.L. Price
  70. * %T Security for Computer Networks
  71. * %I John Wiley & Sons
  72. * %D 1984
  73. * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
  74. * (and actual cblock values).
  75. */
  76. #define NUM_WEAK_KEY 16
  77. static const DES_cblock weak_keys[NUM_WEAK_KEY] = {
  78. /* weak keys */
  79. {0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01},
  80. {0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE},
  81. {0x1F, 0x1F, 0x1F, 0x1F, 0x0E, 0x0E, 0x0E, 0x0E},
  82. {0xE0, 0xE0, 0xE0, 0xE0, 0xF1, 0xF1, 0xF1, 0xF1},
  83. /* semi-weak keys */
  84. {0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE},
  85. {0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01},
  86. {0x1F, 0xE0, 0x1F, 0xE0, 0x0E, 0xF1, 0x0E, 0xF1},
  87. {0xE0, 0x1F, 0xE0, 0x1F, 0xF1, 0x0E, 0xF1, 0x0E},
  88. {0x01, 0xE0, 0x01, 0xE0, 0x01, 0xF1, 0x01, 0xF1},
  89. {0xE0, 0x01, 0xE0, 0x01, 0xF1, 0x01, 0xF1, 0x01},
  90. {0x1F, 0xFE, 0x1F, 0xFE, 0x0E, 0xFE, 0x0E, 0xFE},
  91. {0xFE, 0x1F, 0xFE, 0x1F, 0xFE, 0x0E, 0xFE, 0x0E},
  92. {0x01, 0x1F, 0x01, 0x1F, 0x01, 0x0E, 0x01, 0x0E},
  93. {0x1F, 0x01, 0x1F, 0x01, 0x0E, 0x01, 0x0E, 0x01},
  94. {0xE0, 0xFE, 0xE0, 0xFE, 0xF1, 0xFE, 0xF1, 0xFE},
  95. {0xFE, 0xE0, 0xFE, 0xE0, 0xFE, 0xF1, 0xFE, 0xF1}
  96. };
  97. int DES_is_weak_key(const_DES_cblock *key)
  98. {
  99. int i;
  100. for (i = 0; i < NUM_WEAK_KEY; i++)
  101. /*
  102. * Added == 0 to comparison, I obviously don't run this section very
  103. * often :-(, thanks to engineering@MorningStar.Com for the fix eay
  104. * 93/06/29 Another problem, I was comparing only the first 4 bytes,
  105. * 97/03/18
  106. */
  107. if (memcmp(weak_keys[i], key, sizeof(DES_cblock)) == 0)
  108. return (1);
  109. return (0);
  110. }
  111. /*-
  112. * NOW DEFINED IN des_local.h
  113. * See ecb_encrypt.c for a pseudo description of these macros.
  114. * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
  115. * (b)^=(t),\
  116. * (a)=((a)^((t)<<(n))))
  117. */
  118. #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
  119. (a)=(a)^(t)^(t>>(16-(n))))
  120. static const DES_LONG des_skb[8][64] = {
  121. {
  122. /* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
  123. 0x00000000L, 0x00000010L, 0x20000000L, 0x20000010L,
  124. 0x00010000L, 0x00010010L, 0x20010000L, 0x20010010L,
  125. 0x00000800L, 0x00000810L, 0x20000800L, 0x20000810L,
  126. 0x00010800L, 0x00010810L, 0x20010800L, 0x20010810L,
  127. 0x00000020L, 0x00000030L, 0x20000020L, 0x20000030L,
  128. 0x00010020L, 0x00010030L, 0x20010020L, 0x20010030L,
  129. 0x00000820L, 0x00000830L, 0x20000820L, 0x20000830L,
  130. 0x00010820L, 0x00010830L, 0x20010820L, 0x20010830L,
  131. 0x00080000L, 0x00080010L, 0x20080000L, 0x20080010L,
  132. 0x00090000L, 0x00090010L, 0x20090000L, 0x20090010L,
  133. 0x00080800L, 0x00080810L, 0x20080800L, 0x20080810L,
  134. 0x00090800L, 0x00090810L, 0x20090800L, 0x20090810L,
  135. 0x00080020L, 0x00080030L, 0x20080020L, 0x20080030L,
  136. 0x00090020L, 0x00090030L, 0x20090020L, 0x20090030L,
  137. 0x00080820L, 0x00080830L, 0x20080820L, 0x20080830L,
  138. 0x00090820L, 0x00090830L, 0x20090820L, 0x20090830L,
  139. },
  140. {
  141. /* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
  142. 0x00000000L, 0x02000000L, 0x00002000L, 0x02002000L,
  143. 0x00200000L, 0x02200000L, 0x00202000L, 0x02202000L,
  144. 0x00000004L, 0x02000004L, 0x00002004L, 0x02002004L,
  145. 0x00200004L, 0x02200004L, 0x00202004L, 0x02202004L,
  146. 0x00000400L, 0x02000400L, 0x00002400L, 0x02002400L,
  147. 0x00200400L, 0x02200400L, 0x00202400L, 0x02202400L,
  148. 0x00000404L, 0x02000404L, 0x00002404L, 0x02002404L,
  149. 0x00200404L, 0x02200404L, 0x00202404L, 0x02202404L,
  150. 0x10000000L, 0x12000000L, 0x10002000L, 0x12002000L,
  151. 0x10200000L, 0x12200000L, 0x10202000L, 0x12202000L,
  152. 0x10000004L, 0x12000004L, 0x10002004L, 0x12002004L,
  153. 0x10200004L, 0x12200004L, 0x10202004L, 0x12202004L,
  154. 0x10000400L, 0x12000400L, 0x10002400L, 0x12002400L,
  155. 0x10200400L, 0x12200400L, 0x10202400L, 0x12202400L,
  156. 0x10000404L, 0x12000404L, 0x10002404L, 0x12002404L,
  157. 0x10200404L, 0x12200404L, 0x10202404L, 0x12202404L,
  158. },
  159. {
  160. /* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
  161. 0x00000000L, 0x00000001L, 0x00040000L, 0x00040001L,
  162. 0x01000000L, 0x01000001L, 0x01040000L, 0x01040001L,
  163. 0x00000002L, 0x00000003L, 0x00040002L, 0x00040003L,
  164. 0x01000002L, 0x01000003L, 0x01040002L, 0x01040003L,
  165. 0x00000200L, 0x00000201L, 0x00040200L, 0x00040201L,
  166. 0x01000200L, 0x01000201L, 0x01040200L, 0x01040201L,
  167. 0x00000202L, 0x00000203L, 0x00040202L, 0x00040203L,
  168. 0x01000202L, 0x01000203L, 0x01040202L, 0x01040203L,
  169. 0x08000000L, 0x08000001L, 0x08040000L, 0x08040001L,
  170. 0x09000000L, 0x09000001L, 0x09040000L, 0x09040001L,
  171. 0x08000002L, 0x08000003L, 0x08040002L, 0x08040003L,
  172. 0x09000002L, 0x09000003L, 0x09040002L, 0x09040003L,
  173. 0x08000200L, 0x08000201L, 0x08040200L, 0x08040201L,
  174. 0x09000200L, 0x09000201L, 0x09040200L, 0x09040201L,
  175. 0x08000202L, 0x08000203L, 0x08040202L, 0x08040203L,
  176. 0x09000202L, 0x09000203L, 0x09040202L, 0x09040203L,
  177. },
  178. {
  179. /* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
  180. 0x00000000L, 0x00100000L, 0x00000100L, 0x00100100L,
  181. 0x00000008L, 0x00100008L, 0x00000108L, 0x00100108L,
  182. 0x00001000L, 0x00101000L, 0x00001100L, 0x00101100L,
  183. 0x00001008L, 0x00101008L, 0x00001108L, 0x00101108L,
  184. 0x04000000L, 0x04100000L, 0x04000100L, 0x04100100L,
  185. 0x04000008L, 0x04100008L, 0x04000108L, 0x04100108L,
  186. 0x04001000L, 0x04101000L, 0x04001100L, 0x04101100L,
  187. 0x04001008L, 0x04101008L, 0x04001108L, 0x04101108L,
  188. 0x00020000L, 0x00120000L, 0x00020100L, 0x00120100L,
  189. 0x00020008L, 0x00120008L, 0x00020108L, 0x00120108L,
  190. 0x00021000L, 0x00121000L, 0x00021100L, 0x00121100L,
  191. 0x00021008L, 0x00121008L, 0x00021108L, 0x00121108L,
  192. 0x04020000L, 0x04120000L, 0x04020100L, 0x04120100L,
  193. 0x04020008L, 0x04120008L, 0x04020108L, 0x04120108L,
  194. 0x04021000L, 0x04121000L, 0x04021100L, 0x04121100L,
  195. 0x04021008L, 0x04121008L, 0x04021108L, 0x04121108L,
  196. },
  197. {
  198. /* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
  199. 0x00000000L, 0x10000000L, 0x00010000L, 0x10010000L,
  200. 0x00000004L, 0x10000004L, 0x00010004L, 0x10010004L,
  201. 0x20000000L, 0x30000000L, 0x20010000L, 0x30010000L,
  202. 0x20000004L, 0x30000004L, 0x20010004L, 0x30010004L,
  203. 0x00100000L, 0x10100000L, 0x00110000L, 0x10110000L,
  204. 0x00100004L, 0x10100004L, 0x00110004L, 0x10110004L,
  205. 0x20100000L, 0x30100000L, 0x20110000L, 0x30110000L,
  206. 0x20100004L, 0x30100004L, 0x20110004L, 0x30110004L,
  207. 0x00001000L, 0x10001000L, 0x00011000L, 0x10011000L,
  208. 0x00001004L, 0x10001004L, 0x00011004L, 0x10011004L,
  209. 0x20001000L, 0x30001000L, 0x20011000L, 0x30011000L,
  210. 0x20001004L, 0x30001004L, 0x20011004L, 0x30011004L,
  211. 0x00101000L, 0x10101000L, 0x00111000L, 0x10111000L,
  212. 0x00101004L, 0x10101004L, 0x00111004L, 0x10111004L,
  213. 0x20101000L, 0x30101000L, 0x20111000L, 0x30111000L,
  214. 0x20101004L, 0x30101004L, 0x20111004L, 0x30111004L,
  215. },
  216. {
  217. /* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */
  218. 0x00000000L, 0x08000000L, 0x00000008L, 0x08000008L,
  219. 0x00000400L, 0x08000400L, 0x00000408L, 0x08000408L,
  220. 0x00020000L, 0x08020000L, 0x00020008L, 0x08020008L,
  221. 0x00020400L, 0x08020400L, 0x00020408L, 0x08020408L,
  222. 0x00000001L, 0x08000001L, 0x00000009L, 0x08000009L,
  223. 0x00000401L, 0x08000401L, 0x00000409L, 0x08000409L,
  224. 0x00020001L, 0x08020001L, 0x00020009L, 0x08020009L,
  225. 0x00020401L, 0x08020401L, 0x00020409L, 0x08020409L,
  226. 0x02000000L, 0x0A000000L, 0x02000008L, 0x0A000008L,
  227. 0x02000400L, 0x0A000400L, 0x02000408L, 0x0A000408L,
  228. 0x02020000L, 0x0A020000L, 0x02020008L, 0x0A020008L,
  229. 0x02020400L, 0x0A020400L, 0x02020408L, 0x0A020408L,
  230. 0x02000001L, 0x0A000001L, 0x02000009L, 0x0A000009L,
  231. 0x02000401L, 0x0A000401L, 0x02000409L, 0x0A000409L,
  232. 0x02020001L, 0x0A020001L, 0x02020009L, 0x0A020009L,
  233. 0x02020401L, 0x0A020401L, 0x02020409L, 0x0A020409L,
  234. },
  235. {
  236. /* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */
  237. 0x00000000L, 0x00000100L, 0x00080000L, 0x00080100L,
  238. 0x01000000L, 0x01000100L, 0x01080000L, 0x01080100L,
  239. 0x00000010L, 0x00000110L, 0x00080010L, 0x00080110L,
  240. 0x01000010L, 0x01000110L, 0x01080010L, 0x01080110L,
  241. 0x00200000L, 0x00200100L, 0x00280000L, 0x00280100L,
  242. 0x01200000L, 0x01200100L, 0x01280000L, 0x01280100L,
  243. 0x00200010L, 0x00200110L, 0x00280010L, 0x00280110L,
  244. 0x01200010L, 0x01200110L, 0x01280010L, 0x01280110L,
  245. 0x00000200L, 0x00000300L, 0x00080200L, 0x00080300L,
  246. 0x01000200L, 0x01000300L, 0x01080200L, 0x01080300L,
  247. 0x00000210L, 0x00000310L, 0x00080210L, 0x00080310L,
  248. 0x01000210L, 0x01000310L, 0x01080210L, 0x01080310L,
  249. 0x00200200L, 0x00200300L, 0x00280200L, 0x00280300L,
  250. 0x01200200L, 0x01200300L, 0x01280200L, 0x01280300L,
  251. 0x00200210L, 0x00200310L, 0x00280210L, 0x00280310L,
  252. 0x01200210L, 0x01200310L, 0x01280210L, 0x01280310L,
  253. },
  254. {
  255. /* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */
  256. 0x00000000L, 0x04000000L, 0x00040000L, 0x04040000L,
  257. 0x00000002L, 0x04000002L, 0x00040002L, 0x04040002L,
  258. 0x00002000L, 0x04002000L, 0x00042000L, 0x04042000L,
  259. 0x00002002L, 0x04002002L, 0x00042002L, 0x04042002L,
  260. 0x00000020L, 0x04000020L, 0x00040020L, 0x04040020L,
  261. 0x00000022L, 0x04000022L, 0x00040022L, 0x04040022L,
  262. 0x00002020L, 0x04002020L, 0x00042020L, 0x04042020L,
  263. 0x00002022L, 0x04002022L, 0x00042022L, 0x04042022L,
  264. 0x00000800L, 0x04000800L, 0x00040800L, 0x04040800L,
  265. 0x00000802L, 0x04000802L, 0x00040802L, 0x04040802L,
  266. 0x00002800L, 0x04002800L, 0x00042800L, 0x04042800L,
  267. 0x00002802L, 0x04002802L, 0x00042802L, 0x04042802L,
  268. 0x00000820L, 0x04000820L, 0x00040820L, 0x04040820L,
  269. 0x00000822L, 0x04000822L, 0x00040822L, 0x04040822L,
  270. 0x00002820L, 0x04002820L, 0x00042820L, 0x04042820L,
  271. 0x00002822L, 0x04002822L, 0x00042822L, 0x04042822L,
  272. }
  273. };
  274. int DES_set_key(const_DES_cblock *key, DES_key_schedule *schedule)
  275. {
  276. if (DES_check_key) {
  277. return DES_set_key_checked(key, schedule);
  278. } else {
  279. DES_set_key_unchecked(key, schedule);
  280. return 0;
  281. }
  282. }
  283. /*-
  284. * return 0 if key parity is odd (correct),
  285. * return -1 if key parity error,
  286. * return -2 if illegal weak key.
  287. */
  288. int DES_set_key_checked(const_DES_cblock *key, DES_key_schedule *schedule)
  289. {
  290. if (!DES_check_key_parity(key))
  291. return (-1);
  292. if (DES_is_weak_key(key))
  293. return (-2);
  294. DES_set_key_unchecked(key, schedule);
  295. return 0;
  296. }
  297. void DES_set_key_unchecked(const_DES_cblock *key, DES_key_schedule *schedule)
  298. {
  299. static const int shifts2[16] =
  300. { 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0 };
  301. register DES_LONG c, d, t, s, t2;
  302. register const unsigned char *in;
  303. register DES_LONG *k;
  304. register int i;
  305. #ifdef OPENBSD_DEV_CRYPTO
  306. memcpy(schedule->key, key, sizeof schedule->key);
  307. schedule->session = NULL;
  308. #endif
  309. k = &schedule->ks->deslong[0];
  310. in = &(*key)[0];
  311. c2l(in, c);
  312. c2l(in, d);
  313. /*
  314. * do PC1 in 47 simple operations :-) Thanks to John Fletcher
  315. * (john_fletcher@lccmail.ocf.llnl.gov) for the inspiration. :-)
  316. */
  317. PERM_OP(d, c, t, 4, 0x0f0f0f0fL);
  318. HPERM_OP(c, t, -2, 0xcccc0000L);
  319. HPERM_OP(d, t, -2, 0xcccc0000L);
  320. PERM_OP(d, c, t, 1, 0x55555555L);
  321. PERM_OP(c, d, t, 8, 0x00ff00ffL);
  322. PERM_OP(d, c, t, 1, 0x55555555L);
  323. d = (((d & 0x000000ffL) << 16L) | (d & 0x0000ff00L) |
  324. ((d & 0x00ff0000L) >> 16L) | ((c & 0xf0000000L) >> 4L));
  325. c &= 0x0fffffffL;
  326. for (i = 0; i < ITERATIONS; i++) {
  327. if (shifts2[i]) {
  328. c = ((c >> 2L) | (c << 26L));
  329. d = ((d >> 2L) | (d << 26L));
  330. } else {
  331. c = ((c >> 1L) | (c << 27L));
  332. d = ((d >> 1L) | (d << 27L));
  333. }
  334. c &= 0x0fffffffL;
  335. d &= 0x0fffffffL;
  336. /*
  337. * could be a few less shifts but I am to lazy at this point in time
  338. * to investigate
  339. */
  340. s = des_skb[0][(c) & 0x3f] |
  341. des_skb[1][((c >> 6L) & 0x03) | ((c >> 7L) & 0x3c)] |
  342. des_skb[2][((c >> 13L) & 0x0f) | ((c >> 14L) & 0x30)] |
  343. des_skb[3][((c >> 20L) & 0x01) | ((c >> 21L) & 0x06) |
  344. ((c >> 22L) & 0x38)];
  345. t = des_skb[4][(d) & 0x3f] |
  346. des_skb[5][((d >> 7L) & 0x03) | ((d >> 8L) & 0x3c)] |
  347. des_skb[6][(d >> 15L) & 0x3f] |
  348. des_skb[7][((d >> 21L) & 0x0f) | ((d >> 22L) & 0x30)];
  349. /* table contained 0213 4657 */
  350. t2 = ((t << 16L) | (s & 0x0000ffffL)) & 0xffffffffL;
  351. *(k++) = ROTATE(t2, 30) & 0xffffffffL;
  352. t2 = ((s >> 16L) | (t & 0xffff0000L));
  353. *(k++) = ROTATE(t2, 26) & 0xffffffffL;
  354. }
  355. }
  356. int DES_key_sched(const_DES_cblock *key, DES_key_schedule *schedule)
  357. {
  358. return (DES_set_key(key, schedule));
  359. }
  360. /*-
  361. #undef des_fixup_key_parity
  362. void des_fixup_key_parity(des_cblock *key)
  363. {
  364. des_set_odd_parity(key);
  365. }
  366. */