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| 1 /*- | |
| 2 * Copyright 2005,2007,2009 Colin Percival | |
| 3 * All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions | |
| 7 * are met: | |
| 8 * 1. Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer in the | |
| 12 * documentation and/or other materials provided with the distribution. | |
| 13 * | |
| 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
| 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 24 * SUCH DAMAGE. | |
| 25 */ | |
| 26 #include "scrypt_platform.h" | |
| 27 | |
| 28 #include <sys/types.h> | |
| 29 | |
| 30 #include <stdint.h> | |
| 31 #include <string.h> | |
| 32 | |
| 33 #include "sysendian.h" | |
| 34 | |
| 35 #include "sha256.h" | |
| 36 | |
| 37 /* | |
| 38 * Encode a length len/4 vector of (uint32_t) into a length len vector of | |
| 39 * (unsigned char) in big-endian form. Assumes len is a multiple of 4. | |
| 40 */ | |
| 41 static void | |
| 42 be32enc_vect(unsigned char *dst, const uint32_t *src, size_t len) | |
| 43 { | |
| 44 size_t i; | |
| 45 | |
| 46 for (i = 0; i < len / 4; i++) | |
| 47 be32enc(dst + i * 4, src[i]); | |
| 48 } | |
| 49 | |
| 50 /* | |
| 51 * Decode a big-endian length len vector of (unsigned char) into a length | |
| 52 * len/4 vector of (uint32_t). Assumes len is a multiple of 4. | |
| 53 */ | |
| 54 static void | |
| 55 be32dec_vect(uint32_t *dst, const unsigned char *src, size_t len) | |
| 56 { | |
| 57 size_t i; | |
| 58 | |
| 59 for (i = 0; i < len / 4; i++) | |
| 60 dst[i] = be32dec(src + i * 4); | |
| 61 } | |
| 62 | |
| 63 /* Elementary functions used by SHA256 */ | |
| 64 #define Ch(x, y, z) ((x & (y ^ z)) ^ z) | |
| 65 #define Maj(x, y, z) ((x & (y | z)) | (y & z)) | |
| 66 #define SHR(x, n) (x >> n) | |
| 67 #define ROTR(x, n) ((x >> n) | (x << (32 - n))) | |
| 68 #define S0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22)) | |
| 69 #define S1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25)) | |
| 70 #define s0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3)) | |
| 71 #define s1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10)) | |
| 72 | |
| 73 /* SHA256 round function */ | |
| 74 #define RND(a, b, c, d, e, f, g, h, k) \ | |
| 75 t0 = h + S1(e) + Ch(e, f, g) + k; \ | |
| 76 t1 = S0(a) + Maj(a, b, c); \ | |
| 77 d += t0; \ | |
| 78 h = t0 + t1; | |
| 79 | |
| 80 /* Adjusted round function for rotating state */ | |
| 81 #define RNDr(S, W, i, k) \ | |
| 82 RND(S[(64 - i) % 8], S[(65 - i) % 8], \ | |
| 83 S[(66 - i) % 8], S[(67 - i) % 8], \ | |
| 84 S[(68 - i) % 8], S[(69 - i) % 8], \ | |
| 85 S[(70 - i) % 8], S[(71 - i) % 8], \ | |
| 86 W[i] + k) | |
| 87 | |
| 88 /* | |
| 89 * SHA256 block compression function. The 256-bit state is transformed via | |
| 90 * the 512-bit input block to produce a new state. | |
| 91 */ | |
| 92 static void | |
| 93 SHA256_Transform(uint32_t * state, const unsigned char block[64]) | |
| 94 { | |
| 95 uint32_t W[64]; | |
| 96 uint32_t S[8]; | |
| 97 uint32_t t0, t1; | |
| 98 int i; | |
| 99 | |
| 100 /* 1. Prepare message schedule W. */ | |
| 101 be32dec_vect(W, block, 64); | |
| 102 for (i = 16; i < 64; i++) | |
| 103 W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16]; | |
| 104 | |
| 105 /* 2. Initialize working variables. */ | |
| 106 memcpy(S, state, 32); | |
| 107 | |
| 108 /* 3. Mix. */ | |
| 109 RNDr(S, W, 0, 0x428a2f98); | |
| 110 RNDr(S, W, 1, 0x71374491); | |
| 111 RNDr(S, W, 2, 0xb5c0fbcf); | |
| 112 RNDr(S, W, 3, 0xe9b5dba5); | |
| 113 RNDr(S, W, 4, 0x3956c25b); | |
| 114 RNDr(S, W, 5, 0x59f111f1); | |
| 115 RNDr(S, W, 6, 0x923f82a4); | |
| 116 RNDr(S, W, 7, 0xab1c5ed5); | |
| 117 RNDr(S, W, 8, 0xd807aa98); | |
| 118 RNDr(S, W, 9, 0x12835b01); | |
| 119 RNDr(S, W, 10, 0x243185be); | |
| 120 RNDr(S, W, 11, 0x550c7dc3); | |
| 121 RNDr(S, W, 12, 0x72be5d74); | |
| 122 RNDr(S, W, 13, 0x80deb1fe); | |
| 123 RNDr(S, W, 14, 0x9bdc06a7); | |
| 124 RNDr(S, W, 15, 0xc19bf174); | |
| 125 RNDr(S, W, 16, 0xe49b69c1); | |
| 126 RNDr(S, W, 17, 0xefbe4786); | |
| 127 RNDr(S, W, 18, 0x0fc19dc6); | |
| 128 RNDr(S, W, 19, 0x240ca1cc); | |
| 129 RNDr(S, W, 20, 0x2de92c6f); | |
| 130 RNDr(S, W, 21, 0x4a7484aa); | |
| 131 RNDr(S, W, 22, 0x5cb0a9dc); | |
| 132 RNDr(S, W, 23, 0x76f988da); | |
| 133 RNDr(S, W, 24, 0x983e5152); | |
| 134 RNDr(S, W, 25, 0xa831c66d); | |
| 135 RNDr(S, W, 26, 0xb00327c8); | |
| 136 RNDr(S, W, 27, 0xbf597fc7); | |
| 137 RNDr(S, W, 28, 0xc6e00bf3); | |
| 138 RNDr(S, W, 29, 0xd5a79147); | |
| 139 RNDr(S, W, 30, 0x06ca6351); | |
| 140 RNDr(S, W, 31, 0x14292967); | |
| 141 RNDr(S, W, 32, 0x27b70a85); | |
| 142 RNDr(S, W, 33, 0x2e1b2138); | |
| 143 RNDr(S, W, 34, 0x4d2c6dfc); | |
| 144 RNDr(S, W, 35, 0x53380d13); | |
| 145 RNDr(S, W, 36, 0x650a7354); | |
| 146 RNDr(S, W, 37, 0x766a0abb); | |
| 147 RNDr(S, W, 38, 0x81c2c92e); | |
| 148 RNDr(S, W, 39, 0x92722c85); | |
| 149 RNDr(S, W, 40, 0xa2bfe8a1); | |
| 150 RNDr(S, W, 41, 0xa81a664b); | |
| 151 RNDr(S, W, 42, 0xc24b8b70); | |
| 152 RNDr(S, W, 43, 0xc76c51a3); | |
| 153 RNDr(S, W, 44, 0xd192e819); | |
| 154 RNDr(S, W, 45, 0xd6990624); | |
| 155 RNDr(S, W, 46, 0xf40e3585); | |
| 156 RNDr(S, W, 47, 0x106aa070); | |
| 157 RNDr(S, W, 48, 0x19a4c116); | |
| 158 RNDr(S, W, 49, 0x1e376c08); | |
| 159 RNDr(S, W, 50, 0x2748774c); | |
| 160 RNDr(S, W, 51, 0x34b0bcb5); | |
| 161 RNDr(S, W, 52, 0x391c0cb3); | |
| 162 RNDr(S, W, 53, 0x4ed8aa4a); | |
| 163 RNDr(S, W, 54, 0x5b9cca4f); | |
| 164 RNDr(S, W, 55, 0x682e6ff3); | |
| 165 RNDr(S, W, 56, 0x748f82ee); | |
| 166 RNDr(S, W, 57, 0x78a5636f); | |
| 167 RNDr(S, W, 58, 0x84c87814); | |
| 168 RNDr(S, W, 59, 0x8cc70208); | |
| 169 RNDr(S, W, 60, 0x90befffa); | |
| 170 RNDr(S, W, 61, 0xa4506ceb); | |
| 171 RNDr(S, W, 62, 0xbef9a3f7); | |
| 172 RNDr(S, W, 63, 0xc67178f2); | |
| 173 | |
| 174 /* 4. Mix local working variables into global state */ | |
| 175 for (i = 0; i < 8; i++) | |
| 176 state[i] += S[i]; | |
| 177 | |
| 178 /* Clean the stack. */ | |
| 179 memset(W, 0, 256); | |
| 180 memset(S, 0, 32); | |
| 181 t0 = t1 = 0; | |
| 182 } | |
| 183 | |
| 184 static unsigned char PAD[64] = { | |
| 185 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
| 186 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
| 187 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
| 188 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
| 189 }; | |
| 190 | |
| 191 /* Add padding and terminating bit-count. */ | |
| 192 static void | |
| 193 SHA256_Pad(SHA256_CTX * ctx) | |
| 194 { | |
| 195 unsigned char len[8]; | |
| 196 uint32_t r, plen; | |
| 197 | |
| 198 /* | |
| 199 * Convert length to a vector of bytes -- we do this now rather | |
| 200 * than later because the length will change after we pad. | |
| 201 */ | |
| 202 be32enc_vect(len, ctx->count, 8); | |
| 203 | |
| 204 /* Add 1--64 bytes so that the resulting length is 56 mod 64 */ | |
| 205 r = (ctx->count[1] >> 3) & 0x3f; | |
| 206 plen = (r < 56) ? (56 - r) : (120 - r); | |
| 207 SHA256_Update(ctx, PAD, (size_t)plen); | |
| 208 | |
| 209 /* Add the terminating bit-count */ | |
| 210 SHA256_Update(ctx, len, 8); | |
| 211 } | |
| 212 | |
| 213 /* SHA-256 initialization. Begins a SHA-256 operation. */ | |
| 214 void | |
| 215 SHA256_Init(SHA256_CTX * ctx) | |
| 216 { | |
| 217 | |
| 218 /* Zero bits processed so far */ | |
| 219 ctx->count[0] = ctx->count[1] = 0; | |
| 220 | |
| 221 /* Magic initialization constants */ | |
| 222 ctx->state[0] = 0x6A09E667; | |
| 223 ctx->state[1] = 0xBB67AE85; | |
| 224 ctx->state[2] = 0x3C6EF372; | |
| 225 ctx->state[3] = 0xA54FF53A; | |
| 226 ctx->state[4] = 0x510E527F; | |
| 227 ctx->state[5] = 0x9B05688C; | |
| 228 ctx->state[6] = 0x1F83D9AB; | |
| 229 ctx->state[7] = 0x5BE0CD19; | |
| 230 } | |
| 231 | |
| 232 /* Add bytes into the hash */ | |
| 233 void | |
| 234 SHA256_Update(SHA256_CTX * ctx, const void *in, size_t len) | |
| 235 { | |
| 236 uint32_t bitlen[2]; | |
| 237 uint32_t r; | |
| 238 const unsigned char *src = in; | |
| 239 | |
| 240 /* Number of bytes left in the buffer from previous updates */ | |
| 241 r = (ctx->count[1] >> 3) & 0x3f; | |
| 242 | |
| 243 /* Convert the length into a number of bits */ | |
| 244 bitlen[1] = ((uint32_t)len) << 3; | |
| 245 bitlen[0] = (uint32_t)(len >> 29); | |
| 246 | |
| 247 /* Update number of bits */ | |
| 248 if ((ctx->count[1] += bitlen[1]) < bitlen[1]) | |
| 249 ctx->count[0]++; | |
| 250 ctx->count[0] += bitlen[0]; | |
| 251 | |
| 252 /* Handle the case where we don't need to perform any transforms */ | |
| 253 if (len < 64 - r) { | |
| 254 memcpy(&ctx->buf[r], src, len); | |
| 255 return; | |
| 256 } | |
| 257 | |
| 258 /* Finish the current block */ | |
| 259 memcpy(&ctx->buf[r], src, 64 - r); | |
| 260 SHA256_Transform(ctx->state, ctx->buf); | |
| 261 src += 64 - r; | |
| 262 len -= 64 - r; | |
| 263 | |
| 264 /* Perform complete blocks */ | |
| 265 while (len >= 64) { | |
| 266 SHA256_Transform(ctx->state, src); | |
| 267 src += 64; | |
| 268 len -= 64; | |
| 269 } | |
| 270 | |
| 271 /* Copy left over data into buffer */ | |
| 272 memcpy(ctx->buf, src, len); | |
| 273 } | |
| 274 | |
| 275 /* | |
| 276 * SHA-256 finalization. Pads the input data, exports the hash value, | |
| 277 * and clears the context state. | |
| 278 */ | |
| 279 void | |
| 280 SHA256_Final(unsigned char digest[32], SHA256_CTX * ctx) | |
| 281 { | |
| 282 | |
| 283 /* Add padding */ | |
| 284 SHA256_Pad(ctx); | |
| 285 | |
| 286 /* Write the hash */ | |
| 287 be32enc_vect(digest, ctx->state, 32); | |
| 288 | |
| 289 /* Clear the context state */ | |
| 290 memset((void *)ctx, 0, sizeof(*ctx)); | |
| 291 } | |
| 292 | |
| 293 /* Initialize an HMAC-SHA256 operation with the given key. */ | |
| 294 void | |
| 295 HMAC_SHA256_Init(HMAC_SHA256_CTX * ctx, const void * _K, size_t Klen) | |
| 296 { | |
| 297 unsigned char pad[64]; | |
| 298 unsigned char khash[32]; | |
| 299 const unsigned char * K = _K; | |
| 300 size_t i; | |
| 301 | |
| 302 /* If Klen > 64, the key is really SHA256(K). */ | |
| 303 if (Klen > 64) { | |
| 304 SHA256_Init(&ctx->ictx); | |
| 305 SHA256_Update(&ctx->ictx, K, Klen); | |
| 306 SHA256_Final(khash, &ctx->ictx); | |
| 307 K = khash; | |
| 308 Klen = 32; | |
| 309 } | |
| 310 | |
| 311 /* Inner SHA256 operation is SHA256(K xor [block of 0x36] || data). */ | |
| 312 SHA256_Init(&ctx->ictx); | |
| 313 memset(pad, 0x36, 64); | |
| 314 for (i = 0; i < Klen; i++) | |
| 315 pad[i] ^= K[i]; | |
| 316 SHA256_Update(&ctx->ictx, pad, 64); | |
| 317 | |
| 318 /* Outer SHA256 operation is SHA256(K xor [block of 0x5c] || hash). */ | |
| 319 SHA256_Init(&ctx->octx); | |
| 320 memset(pad, 0x5c, 64); | |
| 321 for (i = 0; i < Klen; i++) | |
| 322 pad[i] ^= K[i]; | |
| 323 SHA256_Update(&ctx->octx, pad, 64); | |
| 324 | |
| 325 /* Clean the stack. */ | |
| 326 memset(khash, 0, 32); | |
| 327 } | |
| 328 | |
| 329 /* Add bytes to the HMAC-SHA256 operation. */ | |
| 330 void | |
| 331 HMAC_SHA256_Update(HMAC_SHA256_CTX * ctx, const void *in, size_t len) | |
| 332 { | |
| 333 | |
| 334 /* Feed data to the inner SHA256 operation. */ | |
| 335 SHA256_Update(&ctx->ictx, in, len); | |
| 336 } | |
| 337 | |
| 338 /* Finish an HMAC-SHA256 operation. */ | |
| 339 void | |
| 340 HMAC_SHA256_Final(unsigned char digest[32], HMAC_SHA256_CTX * ctx) | |
| 341 { | |
| 342 unsigned char ihash[32]; | |
| 343 | |
| 344 /* Finish the inner SHA256 operation. */ | |
| 345 SHA256_Final(ihash, &ctx->ictx); | |
| 346 | |
| 347 /* Feed the inner hash to the outer SHA256 operation. */ | |
| 348 SHA256_Update(&ctx->octx, ihash, 32); | |
| 349 | |
| 350 /* Finish the outer SHA256 operation. */ | |
| 351 SHA256_Final(digest, &ctx->octx); | |
| 352 | |
| 353 /* Clean the stack. */ | |
| 354 memset(ihash, 0, 32); | |
| 355 } | |
| 356 | |
| 357 /** | |
| 358 * PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, c, buf, dkLen): | |
| 359 * Compute PBKDF2(passwd, salt, c, dkLen) using HMAC-SHA256 as the PRF, and | |
| 360 * write the output to buf. The value dkLen must be at most 32 * (2^32 - 1). | |
| 361 */ | |
| 362 void | |
| 363 PBKDF2_SHA256(const uint8_t * passwd, size_t passwdlen, const uint8_t * salt, | |
| 364 size_t saltlen, uint64_t c, uint8_t * buf, size_t dkLen) | |
| 365 { | |
| 366 HMAC_SHA256_CTX PShctx, hctx; | |
| 367 size_t i; | |
| 368 uint8_t ivec[4]; | |
| 369 uint8_t U[32]; | |
| 370 uint8_t T[32]; | |
| 371 uint64_t j; | |
| 372 int k; | |
| 373 size_t clen; | |
| 374 | |
| 375 /* Compute HMAC state after processing P and S. */ | |
| 376 HMAC_SHA256_Init(&PShctx, passwd, passwdlen); | |
| 377 HMAC_SHA256_Update(&PShctx, salt, saltlen); | |
| 378 | |
| 379 /* Iterate through the blocks. */ | |
| 380 for (i = 0; i * 32 < dkLen; i++) { | |
| 381 /* Generate INT(i + 1). */ | |
| 382 be32enc(ivec, (uint32_t)(i + 1)); | |
| 383 | |
| 384 /* Compute U_1 = PRF(P, S || INT(i)). */ | |
| 385 memcpy(&hctx, &PShctx, sizeof(HMAC_SHA256_CTX)); | |
| 386 HMAC_SHA256_Update(&hctx, ivec, 4); | |
| 387 HMAC_SHA256_Final(U, &hctx); | |
| 388 | |
| 389 /* T_i = U_1 ... */ | |
| 390 memcpy(T, U, 32); | |
| 391 | |
| 392 for (j = 2; j <= c; j++) { | |
| 393 /* Compute U_j. */ | |
| 394 HMAC_SHA256_Init(&hctx, passwd, passwdlen); | |
| 395 HMAC_SHA256_Update(&hctx, U, 32); | |
| 396 HMAC_SHA256_Final(U, &hctx); | |
| 397 | |
| 398 /* ... xor U_j ... */ | |
| 399 for (k = 0; k < 32; k++) | |
| 400 T[k] ^= U[k]; | |
| 401 } | |
| 402 | |
| 403 /* Copy as many bytes as necessary into buf. */ | |
| 404 clen = dkLen - i * 32; | |
| 405 if (clen > 32) | |
| 406 clen = 32; | |
| 407 memcpy(&buf[i * 32], T, clen); | |
| 408 } | |
| 409 | |
| 410 /* Clean PShctx, since we never called _Final on it. */ | |
| 411 memset(&PShctx, 0, sizeof(HMAC_SHA256_CTX)); | |
| 412 } | |
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