1// SPDX-License-Identifier: BSD-3-Clause 2/* 3 * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch> 4 * All rights reserved. 5 * 6 * FIPS 180-2 SHA-224/256/384/512 implementation 7 * Last update: 02/02/2007 8 * Issue date: 04/30/2005 9 */ 10 11#include "avb_sha.h" 12 13#define SHFR(x, n) (x >> n) 14#define ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n))) 15#define ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n))) 16#define CH(x, y, z) ((x & y) ^ (~x & z)) 17#define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z)) 18 19#define SHA256_F1(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22)) 20#define SHA256_F2(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25)) 21#define SHA256_F3(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHFR(x, 3)) 22#define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10)) 23 24#define UNPACK32(x, str) \ 25 { \ 26 *((str) + 3) = (uint8_t)((x)); \ 27 *((str) + 2) = (uint8_t)((x) >> 8); \ 28 *((str) + 1) = (uint8_t)((x) >> 16); \ 29 *((str) + 0) = (uint8_t)((x) >> 24); \ 30 } 31 32#define UNPACK64(x, str) \ 33 { \ 34 *((str) + 7) = (uint8_t)x; \ 35 *((str) + 6) = (uint8_t)((uint64_t)x >> 8); \ 36 *((str) + 5) = (uint8_t)((uint64_t)x >> 16); \ 37 *((str) + 4) = (uint8_t)((uint64_t)x >> 24); \ 38 *((str) + 3) = (uint8_t)((uint64_t)x >> 32); \ 39 *((str) + 2) = (uint8_t)((uint64_t)x >> 40); \ 40 *((str) + 1) = (uint8_t)((uint64_t)x >> 48); \ 41 *((str) + 0) = (uint8_t)((uint64_t)x >> 56); \ 42 } 43 44#define PACK32(str, x) \ 45 { \ 46 *(x) = ((uint32_t) * ((str) + 3)) | ((uint32_t) * ((str) + 2) << 8) | \ 47 ((uint32_t) * ((str) + 1) << 16) | \ 48 ((uint32_t) * ((str) + 0) << 24); \ 49 } 50 51/* Macros used for loops unrolling */ 52 53#define SHA256_SCR(i) \ 54 { w[i] = SHA256_F4(w[i - 2]) + w[i - 7] + SHA256_F3(w[i - 15]) + w[i - 16]; } 55 56#define SHA256_EXP(a, b, c, d, e, f, g, h, j) \ 57 { \ 58 t1 = wv[h] + SHA256_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) + sha256_k[j] + \ 59 w[j]; \ 60 t2 = SHA256_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]); \ 61 wv[d] += t1; \ 62 wv[h] = t1 + t2; \ 63 } 64 65static const uint32_t sha256_h0[8] = {0x6a09e667, 66 0xbb67ae85, 67 0x3c6ef372, 68 0xa54ff53a, 69 0x510e527f, 70 0x9b05688c, 71 0x1f83d9ab, 72 0x5be0cd19}; 73 74static const uint32_t sha256_k[64] = { 75 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 76 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 77 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 78 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 79 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 80 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 81 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 82 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 83 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 84 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 85 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2}; 86 87/* SHA-256 implementation */ 88void avb_sha256_init(AvbSHA256Ctx* ctx) { 89#ifndef UNROLL_LOOPS 90 int i; 91 for (i = 0; i < 8; i++) { 92 ctx->h[i] = sha256_h0[i]; 93 } 94#else 95 ctx->h[0] = sha256_h0[0]; 96 ctx->h[1] = sha256_h0[1]; 97 ctx->h[2] = sha256_h0[2]; 98 ctx->h[3] = sha256_h0[3]; 99 ctx->h[4] = sha256_h0[4]; 100 ctx->h[5] = sha256_h0[5]; 101 ctx->h[6] = sha256_h0[6]; 102 ctx->h[7] = sha256_h0[7]; 103#endif /* !UNROLL_LOOPS */ 104 105 ctx->len = 0; 106 ctx->tot_len = 0; 107} 108 109static void SHA256_transform(AvbSHA256Ctx* ctx, 110 const uint8_t* message, 111 size_t block_nb) { 112 uint32_t w[64]; 113 uint32_t wv[8]; 114 uint32_t t1, t2; 115 const unsigned char* sub_block; 116 size_t i; 117 118#ifndef UNROLL_LOOPS 119 size_t j; 120#endif 121 122 for (i = 0; i < block_nb; i++) { 123 sub_block = message + (i << 6); 124 125#ifndef UNROLL_LOOPS 126 for (j = 0; j < 16; j++) { 127 PACK32(&sub_block[j << 2], &w[j]); 128 } 129 130 for (j = 16; j < 64; j++) { 131 SHA256_SCR(j); 132 } 133 134 for (j = 0; j < 8; j++) { 135 wv[j] = ctx->h[j]; 136 } 137 138 for (j = 0; j < 64; j++) { 139 t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6]) + sha256_k[j] + 140 w[j]; 141 t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]); 142 wv[7] = wv[6]; 143 wv[6] = wv[5]; 144 wv[5] = wv[4]; 145 wv[4] = wv[3] + t1; 146 wv[3] = wv[2]; 147 wv[2] = wv[1]; 148 wv[1] = wv[0]; 149 wv[0] = t1 + t2; 150 } 151 152 for (j = 0; j < 8; j++) { 153 ctx->h[j] += wv[j]; 154 } 155#else 156 PACK32(&sub_block[0], &w[0]); 157 PACK32(&sub_block[4], &w[1]); 158 PACK32(&sub_block[8], &w[2]); 159 PACK32(&sub_block[12], &w[3]); 160 PACK32(&sub_block[16], &w[4]); 161 PACK32(&sub_block[20], &w[5]); 162 PACK32(&sub_block[24], &w[6]); 163 PACK32(&sub_block[28], &w[7]); 164 PACK32(&sub_block[32], &w[8]); 165 PACK32(&sub_block[36], &w[9]); 166 PACK32(&sub_block[40], &w[10]); 167 PACK32(&sub_block[44], &w[11]); 168 PACK32(&sub_block[48], &w[12]); 169 PACK32(&sub_block[52], &w[13]); 170 PACK32(&sub_block[56], &w[14]); 171 PACK32(&sub_block[60], &w[15]); 172 173 SHA256_SCR(16); 174 SHA256_SCR(17); 175 SHA256_SCR(18); 176 SHA256_SCR(19); 177 SHA256_SCR(20); 178 SHA256_SCR(21); 179 SHA256_SCR(22); 180 SHA256_SCR(23); 181 SHA256_SCR(24); 182 SHA256_SCR(25); 183 SHA256_SCR(26); 184 SHA256_SCR(27); 185 SHA256_SCR(28); 186 SHA256_SCR(29); 187 SHA256_SCR(30); 188 SHA256_SCR(31); 189 SHA256_SCR(32); 190 SHA256_SCR(33); 191 SHA256_SCR(34); 192 SHA256_SCR(35); 193 SHA256_SCR(36); 194 SHA256_SCR(37); 195 SHA256_SCR(38); 196 SHA256_SCR(39); 197 SHA256_SCR(40); 198 SHA256_SCR(41); 199 SHA256_SCR(42); 200 SHA256_SCR(43); 201 SHA256_SCR(44); 202 SHA256_SCR(45); 203 SHA256_SCR(46); 204 SHA256_SCR(47); 205 SHA256_SCR(48); 206 SHA256_SCR(49); 207 SHA256_SCR(50); 208 SHA256_SCR(51); 209 SHA256_SCR(52); 210 SHA256_SCR(53); 211 SHA256_SCR(54); 212 SHA256_SCR(55); 213 SHA256_SCR(56); 214 SHA256_SCR(57); 215 SHA256_SCR(58); 216 SHA256_SCR(59); 217 SHA256_SCR(60); 218 SHA256_SCR(61); 219 SHA256_SCR(62); 220 SHA256_SCR(63); 221 222 wv[0] = ctx->h[0]; 223 wv[1] = ctx->h[1]; 224 wv[2] = ctx->h[2]; 225 wv[3] = ctx->h[3]; 226 wv[4] = ctx->h[4]; 227 wv[5] = ctx->h[5]; 228 wv[6] = ctx->h[6]; 229 wv[7] = ctx->h[7]; 230 231 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 0); 232 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 1); 233 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 2); 234 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 3); 235 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 4); 236 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 5); 237 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 6); 238 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 7); 239 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 8); 240 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 9); 241 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 10); 242 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 11); 243 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 12); 244 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 13); 245 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 14); 246 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 15); 247 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 16); 248 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 17); 249 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 18); 250 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 19); 251 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 20); 252 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 21); 253 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 22); 254 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 23); 255 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 24); 256 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 25); 257 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 26); 258 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 27); 259 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 28); 260 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 29); 261 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 30); 262 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 31); 263 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 32); 264 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 33); 265 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 34); 266 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 35); 267 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 36); 268 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 37); 269 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 38); 270 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 39); 271 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 40); 272 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 41); 273 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 42); 274 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 43); 275 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 44); 276 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 45); 277 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 46); 278 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 47); 279 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 48); 280 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 49); 281 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 50); 282 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 51); 283 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 52); 284 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 53); 285 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 54); 286 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 55); 287 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 56); 288 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 57); 289 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 58); 290 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 59); 291 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 60); 292 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 61); 293 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 62); 294 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 63); 295 296 ctx->h[0] += wv[0]; 297 ctx->h[1] += wv[1]; 298 ctx->h[2] += wv[2]; 299 ctx->h[3] += wv[3]; 300 ctx->h[4] += wv[4]; 301 ctx->h[5] += wv[5]; 302 ctx->h[6] += wv[6]; 303 ctx->h[7] += wv[7]; 304#endif /* !UNROLL_LOOPS */ 305 } 306} 307 308void avb_sha256_update(AvbSHA256Ctx* ctx, const uint8_t* data, size_t len) { 309 size_t block_nb; 310 size_t new_len, rem_len, tmp_len; 311 const uint8_t* shifted_data; 312 313 tmp_len = AVB_SHA256_BLOCK_SIZE - ctx->len; 314 rem_len = len < tmp_len ? len : tmp_len; 315 316 avb_memcpy(&ctx->block[ctx->len], data, rem_len); 317 318 if (ctx->len + len < AVB_SHA256_BLOCK_SIZE) { 319 ctx->len += len; 320 return; 321 } 322 323 new_len = len - rem_len; 324 block_nb = new_len / AVB_SHA256_BLOCK_SIZE; 325 326 shifted_data = data + rem_len; 327 328 SHA256_transform(ctx, ctx->block, 1); 329 SHA256_transform(ctx, shifted_data, block_nb); 330 331 rem_len = new_len % AVB_SHA256_BLOCK_SIZE; 332 333 avb_memcpy(ctx->block, &shifted_data[block_nb << 6], rem_len); 334 335 ctx->len = rem_len; 336 ctx->tot_len += (block_nb + 1) << 6; 337} 338 339uint8_t* avb_sha256_final(AvbSHA256Ctx* ctx) { 340 size_t block_nb; 341 size_t pm_len; 342 uint64_t len_b; 343#ifndef UNROLL_LOOPS 344 size_t i; 345#endif 346 347 block_nb = 348 (1 + ((AVB_SHA256_BLOCK_SIZE - 9) < (ctx->len % AVB_SHA256_BLOCK_SIZE))); 349 350 len_b = (ctx->tot_len + ctx->len) << 3; 351 pm_len = block_nb << 6; 352 353 avb_memset(ctx->block + ctx->len, 0, pm_len - ctx->len); 354 ctx->block[ctx->len] = 0x80; 355 UNPACK64(len_b, ctx->block + pm_len - 8); 356 357 SHA256_transform(ctx, ctx->block, block_nb); 358 359#ifndef UNROLL_LOOPS 360 for (i = 0; i < 8; i++) { 361 UNPACK32(ctx->h[i], &ctx->buf[i << 2]); 362 } 363#else 364 UNPACK32(ctx->h[0], &ctx->buf[0]); 365 UNPACK32(ctx->h[1], &ctx->buf[4]); 366 UNPACK32(ctx->h[2], &ctx->buf[8]); 367 UNPACK32(ctx->h[3], &ctx->buf[12]); 368 UNPACK32(ctx->h[4], &ctx->buf[16]); 369 UNPACK32(ctx->h[5], &ctx->buf[20]); 370 UNPACK32(ctx->h[6], &ctx->buf[24]); 371 UNPACK32(ctx->h[7], &ctx->buf[28]); 372#endif /* !UNROLL_LOOPS */ 373 374 return ctx->buf; 375} 376