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 <asm/scatterlist.h> 24 #include <asm/byteorder.h> 25 26 #define SHA256_DIGEST_SIZE 32 27 #define SHA256_HMAC_BLOCK_SIZE 64 28 29 struct sha256_ctx { 30 u32 count[2]; 31 u32 state[8]; 32 u8 buf[128]; 33 }; 34 35 static inline u32 Ch(u32 x, u32 y, u32 z) 36 { 37 return z ^ (x & (y ^ z)); 38 } 39 40 static inline u32 Maj(u32 x, u32 y, u32 z) 41 { 42 return (x & y) | (z & (x | y)); 43 } 44 45 #define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22)) 46 #define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25)) 47 #define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3)) 48 #define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10)) 49 50 #define H0 0x6a09e667 51 #define H1 0xbb67ae85 52 #define H2 0x3c6ef372 53 #define H3 0xa54ff53a 54 #define H4 0x510e527f 55 #define H5 0x9b05688c 56 #define H6 0x1f83d9ab 57 #define H7 0x5be0cd19 58 59 static inline void LOAD_OP(int I, u32 *W, const u8 *input) 60 { 61 W[I] = __be32_to_cpu( ((__be32*)(input))[I] ); 62 } 63 64 static inline void BLEND_OP(int I, u32 *W) 65 { 66 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; 67 } 68 69 static void sha256_transform(u32 *state, const u8 *input) 70 { 71 u32 a, b, c, d, e, f, g, h, t1, t2; 72 u32 W[64]; 73 int i; 74 75 /* load the input */ 76 for (i = 0; i < 16; i++) 77 LOAD_OP(i, W, input); 78 79 /* now blend */ 80 for (i = 16; i < 64; i++) 81 BLEND_OP(i, W); 82 83 /* load the state into our registers */ 84 a=state[0]; b=state[1]; c=state[2]; d=state[3]; 85 e=state[4]; f=state[5]; g=state[6]; h=state[7]; 86 87 /* now iterate */ 88 t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0]; 89 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 90 t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1]; 91 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 92 t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2]; 93 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 94 t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3]; 95 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 96 t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4]; 97 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 98 t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5]; 99 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 100 t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6]; 101 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 102 t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7]; 103 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 104 105 t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8]; 106 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 107 t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9]; 108 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 109 t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10]; 110 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 111 t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11]; 112 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 113 t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12]; 114 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 115 t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13]; 116 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 117 t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14]; 118 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 119 t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15]; 120 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 121 122 t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16]; 123 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 124 t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17]; 125 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 126 t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18]; 127 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 128 t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19]; 129 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 130 t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20]; 131 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 132 t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21]; 133 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 134 t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22]; 135 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 136 t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23]; 137 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 138 139 t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24]; 140 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 141 t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25]; 142 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 143 t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26]; 144 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 145 t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27]; 146 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 147 t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28]; 148 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 149 t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29]; 150 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 151 t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30]; 152 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 153 t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31]; 154 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 155 156 t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32]; 157 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 158 t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33]; 159 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 160 t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34]; 161 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 162 t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35]; 163 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 164 t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36]; 165 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 166 t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37]; 167 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 168 t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38]; 169 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 170 t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39]; 171 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 172 173 t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40]; 174 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 175 t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41]; 176 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 177 t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42]; 178 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 179 t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43]; 180 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 181 t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44]; 182 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 183 t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45]; 184 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 185 t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46]; 186 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 187 t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47]; 188 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 189 190 t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48]; 191 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 192 t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49]; 193 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 194 t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50]; 195 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 196 t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51]; 197 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 198 t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52]; 199 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 200 t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53]; 201 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 202 t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54]; 203 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 204 t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55]; 205 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 206 207 t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56]; 208 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 209 t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57]; 210 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 211 t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58]; 212 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 213 t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59]; 214 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 215 t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60]; 216 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 217 t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61]; 218 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 219 t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62]; 220 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 221 t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63]; 222 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 223 224 state[0] += a; state[1] += b; state[2] += c; state[3] += d; 225 state[4] += e; state[5] += f; state[6] += g; state[7] += h; 226 227 /* clear any sensitive info... */ 228 a = b = c = d = e = f = g = h = t1 = t2 = 0; 229 memset(W, 0, 64 * sizeof(u32)); 230 } 231 232 static void sha256_init(void *ctx) 233 { 234 struct sha256_ctx *sctx = ctx; 235 sctx->state[0] = H0; 236 sctx->state[1] = H1; 237 sctx->state[2] = H2; 238 sctx->state[3] = H3; 239 sctx->state[4] = H4; 240 sctx->state[5] = H5; 241 sctx->state[6] = H6; 242 sctx->state[7] = H7; 243 sctx->count[0] = sctx->count[1] = 0; 244 memset(sctx->buf, 0, sizeof(sctx->buf)); 245 } 246 247 static void sha256_update(void *ctx, const u8 *data, unsigned int len) 248 { 249 struct sha256_ctx *sctx = ctx; 250 unsigned int i, index, part_len; 251 252 /* Compute number of bytes mod 128 */ 253 index = (unsigned int)((sctx->count[0] >> 3) & 0x3f); 254 255 /* Update number of bits */ 256 if ((sctx->count[0] += (len << 3)) < (len << 3)) { 257 sctx->count[1]++; 258 sctx->count[1] += (len >> 29); 259 } 260 261 part_len = 64 - index; 262 263 /* Transform as many times as possible. */ 264 if (len >= part_len) { 265 memcpy(&sctx->buf[index], data, part_len); 266 sha256_transform(sctx->state, sctx->buf); 267 268 for (i = part_len; i + 63 < len; i += 64) 269 sha256_transform(sctx->state, &data[i]); 270 index = 0; 271 } else { 272 i = 0; 273 } 274 275 /* Buffer remaining input */ 276 memcpy(&sctx->buf[index], &data[i], len-i); 277 } 278 279 static void sha256_final(void* ctx, u8 *out) 280 { 281 struct sha256_ctx *sctx = ctx; 282 u8 bits[8]; 283 unsigned int index, pad_len, t; 284 int i, j; 285 static const u8 padding[64] = { 0x80, }; 286 287 /* Save number of bits */ 288 t = sctx->count[0]; 289 bits[7] = t; t >>= 8; 290 bits[6] = t; t >>= 8; 291 bits[5] = t; t >>= 8; 292 bits[4] = t; 293 t = sctx->count[1]; 294 bits[3] = t; t >>= 8; 295 bits[2] = t; t >>= 8; 296 bits[1] = t; t >>= 8; 297 bits[0] = t; 298 299 /* Pad out to 56 mod 64. */ 300 index = (sctx->count[0] >> 3) & 0x3f; 301 pad_len = (index < 56) ? (56 - index) : ((64+56) - index); 302 sha256_update(sctx, padding, pad_len); 303 304 /* Append length (before padding) */ 305 sha256_update(sctx, bits, 8); 306 307 /* Store state in digest */ 308 for (i = j = 0; i < 8; i++, j += 4) { 309 t = sctx->state[i]; 310 out[j+3] = t; t >>= 8; 311 out[j+2] = t; t >>= 8; 312 out[j+1] = t; t >>= 8; 313 out[j ] = t; 314 } 315 316 /* Zeroize sensitive information. */ 317 memset(sctx, 0, sizeof(*sctx)); 318 } 319 320 321 static struct crypto_alg alg = { 322 .cra_name = "sha256", 323 .cra_flags = CRYPTO_ALG_TYPE_DIGEST, 324 .cra_blocksize = SHA256_HMAC_BLOCK_SIZE, 325 .cra_ctxsize = sizeof(struct sha256_ctx), 326 .cra_module = THIS_MODULE, 327 .cra_list = LIST_HEAD_INIT(alg.cra_list), 328 .cra_u = { .digest = { 329 .dia_digestsize = SHA256_DIGEST_SIZE, 330 .dia_init = sha256_init, 331 .dia_update = sha256_update, 332 .dia_final = sha256_final } } 333 }; 334 335 static int __init init(void) 336 { 337 return crypto_register_alg(&alg); 338 } 339 340 static void __exit fini(void) 341 { 342 crypto_unregister_alg(&alg); 343 } 344 345 module_init(init); 346 module_exit(fini); 347 348 MODULE_LICENSE("GPL"); 349 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm"); 350