sha256.c 11 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * SHA-256, as specified in
  4. * http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf
  5. *
  6. * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>.
  7. *
  8. * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
  9. * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  10. * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  11. * Copyright (c) 2014 Red Hat Inc.
  12. */
  13. #include <linux/bitops.h>
  14. #include <linux/export.h>
  15. #include <linux/module.h>
  16. #include <linux/string.h>
  17. #include <crypto/sha.h>
  18. #include <asm/unaligned.h>
  19. #include <trace/hooks/fips140.h>
  20. static inline u32 Ch(u32 x, u32 y, u32 z)
  21. {
  22. return z ^ (x & (y ^ z));
  23. }
  24. static inline u32 Maj(u32 x, u32 y, u32 z)
  25. {
  26. return (x & y) | (z & (x | y));
  27. }
  28. #define e0(x) (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22))
  29. #define e1(x) (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25))
  30. #define s0(x) (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3))
  31. #define s1(x) (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10))
  32. static inline void LOAD_OP(int I, u32 *W, const u8 *input)
  33. {
  34. W[I] = get_unaligned_be32((__u32 *)input + I);
  35. }
  36. static inline void BLEND_OP(int I, u32 *W)
  37. {
  38. W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
  39. }
  40. static void sha256_transform(u32 *state, const u8 *input)
  41. {
  42. u32 a, b, c, d, e, f, g, h, t1, t2;
  43. u32 W[64];
  44. int i;
  45. /* load the input */
  46. for (i = 0; i < 16; i++)
  47. LOAD_OP(i, W, input);
  48. /* now blend */
  49. for (i = 16; i < 64; i++)
  50. BLEND_OP(i, W);
  51. /* load the state into our registers */
  52. a = state[0]; b = state[1]; c = state[2]; d = state[3];
  53. e = state[4]; f = state[5]; g = state[6]; h = state[7];
  54. /* now iterate */
  55. t1 = h + e1(e) + Ch(e, f, g) + 0x428a2f98 + W[0];
  56. t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
  57. t1 = g + e1(d) + Ch(d, e, f) + 0x71374491 + W[1];
  58. t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
  59. t1 = f + e1(c) + Ch(c, d, e) + 0xb5c0fbcf + W[2];
  60. t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
  61. t1 = e + e1(b) + Ch(b, c, d) + 0xe9b5dba5 + W[3];
  62. t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
  63. t1 = d + e1(a) + Ch(a, b, c) + 0x3956c25b + W[4];
  64. t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
  65. t1 = c + e1(h) + Ch(h, a, b) + 0x59f111f1 + W[5];
  66. t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
  67. t1 = b + e1(g) + Ch(g, h, a) + 0x923f82a4 + W[6];
  68. t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
  69. t1 = a + e1(f) + Ch(f, g, h) + 0xab1c5ed5 + W[7];
  70. t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2;
  71. t1 = h + e1(e) + Ch(e, f, g) + 0xd807aa98 + W[8];
  72. t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
  73. t1 = g + e1(d) + Ch(d, e, f) + 0x12835b01 + W[9];
  74. t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
  75. t1 = f + e1(c) + Ch(c, d, e) + 0x243185be + W[10];
  76. t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
  77. t1 = e + e1(b) + Ch(b, c, d) + 0x550c7dc3 + W[11];
  78. t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
  79. t1 = d + e1(a) + Ch(a, b, c) + 0x72be5d74 + W[12];
  80. t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
  81. t1 = c + e1(h) + Ch(h, a, b) + 0x80deb1fe + W[13];
  82. t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
  83. t1 = b + e1(g) + Ch(g, h, a) + 0x9bdc06a7 + W[14];
  84. t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
  85. t1 = a + e1(f) + Ch(f, g, h) + 0xc19bf174 + W[15];
  86. t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2;
  87. t1 = h + e1(e) + Ch(e, f, g) + 0xe49b69c1 + W[16];
  88. t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
  89. t1 = g + e1(d) + Ch(d, e, f) + 0xefbe4786 + W[17];
  90. t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
  91. t1 = f + e1(c) + Ch(c, d, e) + 0x0fc19dc6 + W[18];
  92. t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
  93. t1 = e + e1(b) + Ch(b, c, d) + 0x240ca1cc + W[19];
  94. t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
  95. t1 = d + e1(a) + Ch(a, b, c) + 0x2de92c6f + W[20];
  96. t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
  97. t1 = c + e1(h) + Ch(h, a, b) + 0x4a7484aa + W[21];
  98. t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
  99. t1 = b + e1(g) + Ch(g, h, a) + 0x5cb0a9dc + W[22];
  100. t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
  101. t1 = a + e1(f) + Ch(f, g, h) + 0x76f988da + W[23];
  102. t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2;
  103. t1 = h + e1(e) + Ch(e, f, g) + 0x983e5152 + W[24];
  104. t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
  105. t1 = g + e1(d) + Ch(d, e, f) + 0xa831c66d + W[25];
  106. t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
  107. t1 = f + e1(c) + Ch(c, d, e) + 0xb00327c8 + W[26];
  108. t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
  109. t1 = e + e1(b) + Ch(b, c, d) + 0xbf597fc7 + W[27];
  110. t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
  111. t1 = d + e1(a) + Ch(a, b, c) + 0xc6e00bf3 + W[28];
  112. t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
  113. t1 = c + e1(h) + Ch(h, a, b) + 0xd5a79147 + W[29];
  114. t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
  115. t1 = b + e1(g) + Ch(g, h, a) + 0x06ca6351 + W[30];
  116. t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
  117. t1 = a + e1(f) + Ch(f, g, h) + 0x14292967 + W[31];
  118. t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2;
  119. t1 = h + e1(e) + Ch(e, f, g) + 0x27b70a85 + W[32];
  120. t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
  121. t1 = g + e1(d) + Ch(d, e, f) + 0x2e1b2138 + W[33];
  122. t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
  123. t1 = f + e1(c) + Ch(c, d, e) + 0x4d2c6dfc + W[34];
  124. t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
  125. t1 = e + e1(b) + Ch(b, c, d) + 0x53380d13 + W[35];
  126. t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
  127. t1 = d + e1(a) + Ch(a, b, c) + 0x650a7354 + W[36];
  128. t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
  129. t1 = c + e1(h) + Ch(h, a, b) + 0x766a0abb + W[37];
  130. t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
  131. t1 = b + e1(g) + Ch(g, h, a) + 0x81c2c92e + W[38];
  132. t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
  133. t1 = a + e1(f) + Ch(f, g, h) + 0x92722c85 + W[39];
  134. t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2;
  135. t1 = h + e1(e) + Ch(e, f, g) + 0xa2bfe8a1 + W[40];
  136. t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
  137. t1 = g + e1(d) + Ch(d, e, f) + 0xa81a664b + W[41];
  138. t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
  139. t1 = f + e1(c) + Ch(c, d, e) + 0xc24b8b70 + W[42];
  140. t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
  141. t1 = e + e1(b) + Ch(b, c, d) + 0xc76c51a3 + W[43];
  142. t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
  143. t1 = d + e1(a) + Ch(a, b, c) + 0xd192e819 + W[44];
  144. t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
  145. t1 = c + e1(h) + Ch(h, a, b) + 0xd6990624 + W[45];
  146. t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
  147. t1 = b + e1(g) + Ch(g, h, a) + 0xf40e3585 + W[46];
  148. t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
  149. t1 = a + e1(f) + Ch(f, g, h) + 0x106aa070 + W[47];
  150. t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2;
  151. t1 = h + e1(e) + Ch(e, f, g) + 0x19a4c116 + W[48];
  152. t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
  153. t1 = g + e1(d) + Ch(d, e, f) + 0x1e376c08 + W[49];
  154. t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
  155. t1 = f + e1(c) + Ch(c, d, e) + 0x2748774c + W[50];
  156. t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
  157. t1 = e + e1(b) + Ch(b, c, d) + 0x34b0bcb5 + W[51];
  158. t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
  159. t1 = d + e1(a) + Ch(a, b, c) + 0x391c0cb3 + W[52];
  160. t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
  161. t1 = c + e1(h) + Ch(h, a, b) + 0x4ed8aa4a + W[53];
  162. t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
  163. t1 = b + e1(g) + Ch(g, h, a) + 0x5b9cca4f + W[54];
  164. t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
  165. t1 = a + e1(f) + Ch(f, g, h) + 0x682e6ff3 + W[55];
  166. t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2;
  167. t1 = h + e1(e) + Ch(e, f, g) + 0x748f82ee + W[56];
  168. t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
  169. t1 = g + e1(d) + Ch(d, e, f) + 0x78a5636f + W[57];
  170. t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
  171. t1 = f + e1(c) + Ch(c, d, e) + 0x84c87814 + W[58];
  172. t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
  173. t1 = e + e1(b) + Ch(b, c, d) + 0x8cc70208 + W[59];
  174. t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
  175. t1 = d + e1(a) + Ch(a, b, c) + 0x90befffa + W[60];
  176. t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
  177. t1 = c + e1(h) + Ch(h, a, b) + 0xa4506ceb + W[61];
  178. t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
  179. t1 = b + e1(g) + Ch(g, h, a) + 0xbef9a3f7 + W[62];
  180. t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
  181. t1 = a + e1(f) + Ch(f, g, h) + 0xc67178f2 + W[63];
  182. t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2;
  183. state[0] += a; state[1] += b; state[2] += c; state[3] += d;
  184. state[4] += e; state[5] += f; state[6] += g; state[7] += h;
  185. /* clear any sensitive info... */
  186. a = b = c = d = e = f = g = h = t1 = t2 = 0;
  187. memzero_explicit(W, 64 * sizeof(u32));
  188. }
  189. void sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
  190. {
  191. unsigned int partial, done;
  192. const u8 *src;
  193. partial = sctx->count & 0x3f;
  194. sctx->count += len;
  195. done = 0;
  196. src = data;
  197. if ((partial + len) > 63) {
  198. if (partial) {
  199. done = -partial;
  200. memcpy(sctx->buf + partial, data, done + 64);
  201. src = sctx->buf;
  202. }
  203. do {
  204. sha256_transform(sctx->state, src);
  205. done += 64;
  206. src = data + done;
  207. } while (done + 63 < len);
  208. partial = 0;
  209. }
  210. memcpy(sctx->buf + partial, src, len - done);
  211. }
  212. EXPORT_SYMBOL(sha256_update);
  213. void sha224_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
  214. {
  215. sha256_update(sctx, data, len);
  216. }
  217. EXPORT_SYMBOL(sha224_update);
  218. static void __sha256_final(struct sha256_state *sctx, u8 *out, int digest_words)
  219. {
  220. __be32 *dst = (__be32 *)out;
  221. __be64 bits;
  222. unsigned int index, pad_len;
  223. int i;
  224. static const u8 padding[64] = { 0x80, };
  225. /* Save number of bits */
  226. bits = cpu_to_be64(sctx->count << 3);
  227. /* Pad out to 56 mod 64. */
  228. index = sctx->count & 0x3f;
  229. pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
  230. sha256_update(sctx, padding, pad_len);
  231. /* Append length (before padding) */
  232. sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
  233. /* Store state in digest */
  234. for (i = 0; i < digest_words; i++)
  235. put_unaligned_be32(sctx->state[i], &dst[i]);
  236. /* Zeroize sensitive information. */
  237. memset(sctx, 0, sizeof(*sctx));
  238. }
  239. void sha256_final(struct sha256_state *sctx, u8 *out)
  240. {
  241. __sha256_final(sctx, out, 8);
  242. }
  243. EXPORT_SYMBOL(sha256_final);
  244. void sha224_final(struct sha256_state *sctx, u8 *out)
  245. {
  246. __sha256_final(sctx, out, 7);
  247. }
  248. EXPORT_SYMBOL(sha224_final);
  249. void sha256(const u8 *data, unsigned int len, u8 *out)
  250. {
  251. struct sha256_state sctx;
  252. #if defined(CONFIG_CRYPTO_FIPS140) && !defined(BUILD_FIPS140_KO)
  253. int hook_inuse = 0;
  254. trace_android_vh_sha256(data, len, out, &hook_inuse);
  255. if (hook_inuse)
  256. return;
  257. #endif
  258. sha256_init(&sctx);
  259. sha256_update(&sctx, data, len);
  260. sha256_final(&sctx, out);
  261. }
  262. EXPORT_SYMBOL(sha256);
  263. MODULE_LICENSE("GPL");