sha256.c 11 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342
  1. /*
  2. * Cryptographic API.
  3. *
  4. * SHA-256, as specified in
  5. * http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf
  6. *
  7. * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>.
  8. *
  9. * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
  10. * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  11. * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  12. *
  13. * This program is free software; you can redistribute it and/or modify it
  14. * under the terms of the GNU General Public License as published by the Free
  15. * Software Foundation; either version 2 of the License, or (at your option)
  16. * any later version.
  17. *
  18. */
  19. #include <linux/init.h>
  20. #include <linux/module.h>
  21. #include <linux/mm.h>
  22. #include <linux/crypto.h>
  23. #include <linux/types.h>
  24. #include <asm/scatterlist.h>
  25. #include <asm/byteorder.h>
  26. #define SHA256_DIGEST_SIZE 32
  27. #define SHA256_HMAC_BLOCK_SIZE 64
  28. struct sha256_ctx {
  29. u32 count[2];
  30. u32 state[8];
  31. u8 buf[128];
  32. };
  33. static inline u32 Ch(u32 x, u32 y, u32 z)
  34. {
  35. return z ^ (x & (y ^ z));
  36. }
  37. static inline u32 Maj(u32 x, u32 y, u32 z)
  38. {
  39. return (x & y) | (z & (x | y));
  40. }
  41. #define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
  42. #define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
  43. #define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
  44. #define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
  45. #define H0 0x6a09e667
  46. #define H1 0xbb67ae85
  47. #define H2 0x3c6ef372
  48. #define H3 0xa54ff53a
  49. #define H4 0x510e527f
  50. #define H5 0x9b05688c
  51. #define H6 0x1f83d9ab
  52. #define H7 0x5be0cd19
  53. static inline void LOAD_OP(int I, u32 *W, const u8 *input)
  54. {
  55. W[I] = __be32_to_cpu( ((__be32*)(input))[I] );
  56. }
  57. static inline void BLEND_OP(int I, u32 *W)
  58. {
  59. W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
  60. }
  61. static void sha256_transform(u32 *state, const u8 *input)
  62. {
  63. u32 a, b, c, d, e, f, g, h, t1, t2;
  64. u32 W[64];
  65. int i;
  66. /* load the input */
  67. for (i = 0; i < 16; i++)
  68. LOAD_OP(i, W, input);
  69. /* now blend */
  70. for (i = 16; i < 64; i++)
  71. BLEND_OP(i, W);
  72. /* load the state into our registers */
  73. a=state[0]; b=state[1]; c=state[2]; d=state[3];
  74. e=state[4]; f=state[5]; g=state[6]; h=state[7];
  75. /* now iterate */
  76. t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
  77. t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
  78. t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
  79. t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
  80. t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
  81. t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
  82. t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
  83. t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
  84. t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
  85. t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
  86. t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
  87. t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
  88. t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
  89. t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
  90. t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
  91. t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
  92. t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
  93. t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
  94. t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
  95. t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
  96. t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
  97. t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
  98. t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
  99. t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
  100. t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
  101. t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
  102. t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
  103. t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
  104. t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
  105. t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
  106. t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
  107. t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
  108. t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
  109. t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
  110. t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
  111. t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
  112. t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
  113. t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
  114. t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
  115. t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
  116. t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
  117. t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
  118. t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
  119. t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
  120. t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
  121. t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
  122. t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
  123. t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
  124. t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
  125. t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
  126. t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
  127. t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
  128. t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
  129. t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
  130. t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
  131. t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
  132. t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
  133. t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
  134. t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
  135. t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
  136. t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
  137. t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
  138. t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
  139. t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
  140. t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
  141. t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
  142. t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
  143. t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
  144. t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
  145. t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
  146. t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
  147. t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
  148. t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
  149. t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
  150. t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
  151. t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
  152. t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
  153. t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
  154. t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
  155. t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
  156. t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
  157. t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
  158. t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
  159. t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
  160. t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
  161. t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
  162. t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
  163. t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
  164. t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
  165. t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
  166. t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
  167. t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
  168. t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
  169. t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
  170. t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
  171. t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
  172. t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
  173. t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
  174. t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
  175. t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
  176. t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
  177. t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
  178. t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
  179. t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
  180. t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
  181. t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
  182. t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
  183. t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
  184. t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
  185. t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
  186. t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
  187. t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
  188. t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
  189. t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
  190. t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
  191. t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
  192. t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
  193. t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
  194. t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
  195. t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
  196. t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
  197. t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
  198. t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
  199. t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
  200. t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
  201. t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
  202. t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
  203. t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
  204. state[0] += a; state[1] += b; state[2] += c; state[3] += d;
  205. state[4] += e; state[5] += f; state[6] += g; state[7] += h;
  206. /* clear any sensitive info... */
  207. a = b = c = d = e = f = g = h = t1 = t2 = 0;
  208. memset(W, 0, 64 * sizeof(u32));
  209. }
  210. static void sha256_init(struct crypto_tfm *tfm)
  211. {
  212. struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
  213. sctx->state[0] = H0;
  214. sctx->state[1] = H1;
  215. sctx->state[2] = H2;
  216. sctx->state[3] = H3;
  217. sctx->state[4] = H4;
  218. sctx->state[5] = H5;
  219. sctx->state[6] = H6;
  220. sctx->state[7] = H7;
  221. sctx->count[0] = sctx->count[1] = 0;
  222. }
  223. static void sha256_update(struct crypto_tfm *tfm, const u8 *data,
  224. unsigned int len)
  225. {
  226. struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
  227. unsigned int i, index, part_len;
  228. /* Compute number of bytes mod 128 */
  229. index = (unsigned int)((sctx->count[0] >> 3) & 0x3f);
  230. /* Update number of bits */
  231. if ((sctx->count[0] += (len << 3)) < (len << 3)) {
  232. sctx->count[1]++;
  233. sctx->count[1] += (len >> 29);
  234. }
  235. part_len = 64 - index;
  236. /* Transform as many times as possible. */
  237. if (len >= part_len) {
  238. memcpy(&sctx->buf[index], data, part_len);
  239. sha256_transform(sctx->state, sctx->buf);
  240. for (i = part_len; i + 63 < len; i += 64)
  241. sha256_transform(sctx->state, &data[i]);
  242. index = 0;
  243. } else {
  244. i = 0;
  245. }
  246. /* Buffer remaining input */
  247. memcpy(&sctx->buf[index], &data[i], len-i);
  248. }
  249. static void sha256_final(struct crypto_tfm *tfm, u8 *out)
  250. {
  251. struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
  252. __be32 *dst = (__be32 *)out;
  253. __be32 bits[2];
  254. unsigned int index, pad_len;
  255. int i;
  256. static const u8 padding[64] = { 0x80, };
  257. /* Save number of bits */
  258. bits[1] = cpu_to_be32(sctx->count[0]);
  259. bits[0] = cpu_to_be32(sctx->count[1]);
  260. /* Pad out to 56 mod 64. */
  261. index = (sctx->count[0] >> 3) & 0x3f;
  262. pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
  263. sha256_update(tfm, padding, pad_len);
  264. /* Append length (before padding) */
  265. sha256_update(tfm, (const u8 *)bits, sizeof(bits));
  266. /* Store state in digest */
  267. for (i = 0; i < 8; i++)
  268. dst[i] = cpu_to_be32(sctx->state[i]);
  269. /* Zeroize sensitive information. */
  270. memset(sctx, 0, sizeof(*sctx));
  271. }
  272. static struct crypto_alg alg = {
  273. .cra_name = "sha256",
  274. .cra_driver_name= "sha256-generic",
  275. .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
  276. .cra_blocksize = SHA256_HMAC_BLOCK_SIZE,
  277. .cra_ctxsize = sizeof(struct sha256_ctx),
  278. .cra_module = THIS_MODULE,
  279. .cra_alignmask = 3,
  280. .cra_list = LIST_HEAD_INIT(alg.cra_list),
  281. .cra_u = { .digest = {
  282. .dia_digestsize = SHA256_DIGEST_SIZE,
  283. .dia_init = sha256_init,
  284. .dia_update = sha256_update,
  285. .dia_final = sha256_final } }
  286. };
  287. static int __init init(void)
  288. {
  289. return crypto_register_alg(&alg);
  290. }
  291. static void __exit fini(void)
  292. {
  293. crypto_unregister_alg(&alg);
  294. }
  295. module_init(init);
  296. module_exit(fini);
  297. MODULE_LICENSE("GPL");
  298. MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
  299. MODULE_ALIAS("sha256-generic");