sha2small.c
1 /* 2 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org> 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining 5 * a copy of this software and associated documentation files (the 6 * "Software"), to deal in the Software without restriction, including 7 * without limitation the rights to use, copy, modify, merge, publish, 8 * distribute, sublicense, and/or sell copies of the Software, and to 9 * permit persons to whom the Software is furnished to do so, subject to 10 * the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be 13 * included in all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22 * SOFTWARE. 23 */ 24 25 #include "inner.h" 26 27 #define CH(X, Y, Z) ((((Y) ^ (Z)) & (X)) ^ (Z)) 28 #define MAJ(X, Y, Z) (((Y) & (Z)) | (((Y) | (Z)) & (X))) 29 30 #define ROTR(x, n) (((uint32_t)(x) << (32 - (n))) | ((uint32_t)(x) >> (n))) 31 32 #define BSG2_0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22)) 33 #define BSG2_1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25)) 34 #define SSG2_0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ (uint32_t)((x) >> 3)) 35 #define SSG2_1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ (uint32_t)((x) >> 10)) 36 37 /* see inner.h */ 38 const uint32_t br_sha224_IV[8] = { 39 0xC1059ED8, 0x367CD507, 0x3070DD17, 0xF70E5939, 40 0xFFC00B31, 0x68581511, 0x64F98FA7, 0xBEFA4FA4 41 }; 42 43 /* see inner.h */ 44 const uint32_t br_sha256_IV[8] = { 45 0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 46 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19 47 }; 48 49 static const uint32_t K[64] = { 50 0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5, 51 0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5, 52 0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3, 53 0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174, 54 0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC, 55 0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA, 56 0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7, 57 0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967, 58 0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13, 59 0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85, 60 0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3, 61 0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070, 62 0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5, 63 0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3, 64 0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208, 65 0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2 66 }; 67 68 /* see inner.h */ 69 void 70 br_sha2small_round(const unsigned char *buf, uint32_t *val) 71 { 72 73 #define SHA2_STEP(A, B, C, D, E, F, G, H, j) do { \ 74 uint32_t T1, T2; \ 75 T1 = H + BSG2_1(E) + CH(E, F, G) + K[j] + w[j]; \ 76 T2 = BSG2_0(A) + MAJ(A, B, C); \ 77 D += T1; \ 78 H = T1 + T2; \ 79 } while (0) 80 81 int i; 82 uint32_t a, b, c, d, e, f, g, h; 83 uint32_t w[64]; 84 85 br_range_dec32be(w, 16, buf); 86 for (i = 16; i < 64; i ++) { 87 w[i] = SSG2_1(w[i - 2]) + w[i - 7] 88 + SSG2_0(w[i - 15]) + w[i - 16]; 89 } 90 a = val[0]; 91 b = val[1]; 92 c = val[2]; 93 d = val[3]; 94 e = val[4]; 95 f = val[5]; 96 g = val[6]; 97 h = val[7]; 98 for (i = 0; i < 64; i += 8) { 99 SHA2_STEP(a, b, c, d, e, f, g, h, i + 0); 100 SHA2_STEP(h, a, b, c, d, e, f, g, i + 1); 101 SHA2_STEP(g, h, a, b, c, d, e, f, i + 2); 102 SHA2_STEP(f, g, h, a, b, c, d, e, i + 3); 103 SHA2_STEP(e, f, g, h, a, b, c, d, i + 4); 104 SHA2_STEP(d, e, f, g, h, a, b, c, i + 5); 105 SHA2_STEP(c, d, e, f, g, h, a, b, i + 6); 106 SHA2_STEP(b, c, d, e, f, g, h, a, i + 7); 107 } 108 val[0] += a; 109 val[1] += b; 110 val[2] += c; 111 val[3] += d; 112 val[4] += e; 113 val[5] += f; 114 val[6] += g; 115 val[7] += h; 116 117 #if 0 118 /* obsolete */ 119 #define SHA2_MEXP1(pc) do { \ 120 W[pc] = br_dec32be(buf + ((pc) << 2)); \ 121 } while (0) 122 123 #define SHA2_MEXP2(pc) do { \ 124 W[(pc) & 0x0F] = SSG2_1(W[((pc) - 2) & 0x0F]) \ 125 + W[((pc) - 7) & 0x0F] \ 126 + SSG2_0(W[((pc) - 15) & 0x0F]) + W[(pc) & 0x0F]; \ 127 } while (0) 128 129 #define SHA2_STEPn(n, a, b, c, d, e, f, g, h, pc) do { \ 130 uint32_t t1, t2; \ 131 SHA2_MEXP ## n(pc); \ 132 t1 = h + BSG2_1(e) + CH(e, f, g) \ 133 + K[pcount + (pc)] + W[(pc) & 0x0F]; \ 134 t2 = BSG2_0(a) + MAJ(a, b, c); \ 135 d += t1; \ 136 h = t1 + t2; \ 137 } while (0) 138 139 #define SHA2_STEP1(a, b, c, d, e, f, g, h, pc) \ 140 SHA2_STEPn(1, a, b, c, d, e, f, g, h, pc) 141 #define SHA2_STEP2(a, b, c, d, e, f, g, h, pc) \ 142 SHA2_STEPn(2, a, b, c, d, e, f, g, h, pc) 143 144 uint32_t A, B, C, D, E, F, G, H; 145 uint32_t W[16]; 146 unsigned pcount; 147 148 A = val[0]; 149 B = val[1]; 150 C = val[2]; 151 D = val[3]; 152 E = val[4]; 153 F = val[5]; 154 G = val[6]; 155 H = val[7]; 156 pcount = 0; 157 SHA2_STEP1(A, B, C, D, E, F, G, H, 0); 158 SHA2_STEP1(H, A, B, C, D, E, F, G, 1); 159 SHA2_STEP1(G, H, A, B, C, D, E, F, 2); 160 SHA2_STEP1(F, G, H, A, B, C, D, E, 3); 161 SHA2_STEP1(E, F, G, H, A, B, C, D, 4); 162 SHA2_STEP1(D, E, F, G, H, A, B, C, 5); 163 SHA2_STEP1(C, D, E, F, G, H, A, B, 6); 164 SHA2_STEP1(B, C, D, E, F, G, H, A, 7); 165 SHA2_STEP1(A, B, C, D, E, F, G, H, 8); 166 SHA2_STEP1(H, A, B, C, D, E, F, G, 9); 167 SHA2_STEP1(G, H, A, B, C, D, E, F, 10); 168 SHA2_STEP1(F, G, H, A, B, C, D, E, 11); 169 SHA2_STEP1(E, F, G, H, A, B, C, D, 12); 170 SHA2_STEP1(D, E, F, G, H, A, B, C, 13); 171 SHA2_STEP1(C, D, E, F, G, H, A, B, 14); 172 SHA2_STEP1(B, C, D, E, F, G, H, A, 15); 173 for (pcount = 16; pcount < 64; pcount += 16) { 174 SHA2_STEP2(A, B, C, D, E, F, G, H, 0); 175 SHA2_STEP2(H, A, B, C, D, E, F, G, 1); 176 SHA2_STEP2(G, H, A, B, C, D, E, F, 2); 177 SHA2_STEP2(F, G, H, A, B, C, D, E, 3); 178 SHA2_STEP2(E, F, G, H, A, B, C, D, 4); 179 SHA2_STEP2(D, E, F, G, H, A, B, C, 5); 180 SHA2_STEP2(C, D, E, F, G, H, A, B, 6); 181 SHA2_STEP2(B, C, D, E, F, G, H, A, 7); 182 SHA2_STEP2(A, B, C, D, E, F, G, H, 8); 183 SHA2_STEP2(H, A, B, C, D, E, F, G, 9); 184 SHA2_STEP2(G, H, A, B, C, D, E, F, 10); 185 SHA2_STEP2(F, G, H, A, B, C, D, E, 11); 186 SHA2_STEP2(E, F, G, H, A, B, C, D, 12); 187 SHA2_STEP2(D, E, F, G, H, A, B, C, 13); 188 SHA2_STEP2(C, D, E, F, G, H, A, B, 14); 189 SHA2_STEP2(B, C, D, E, F, G, H, A, 15); 190 } 191 val[0] += A; 192 val[1] += B; 193 val[2] += C; 194 val[3] += D; 195 val[4] += E; 196 val[5] += F; 197 val[6] += G; 198 val[7] += H; 199 #endif 200 } 201 202 static void 203 sha2small_update(br_sha224_context *cc, const void *data, size_t len) 204 { 205 const unsigned char *buf; 206 size_t ptr; 207 208 buf = data; 209 ptr = (size_t)cc->count & 63; 210 cc->count += (uint64_t)len; 211 while (len > 0) { 212 size_t clen; 213 214 clen = 64 - ptr; 215 if (clen > len) { 216 clen = len; 217 } 218 memcpy(cc->buf + ptr, buf, clen); 219 ptr += clen; 220 buf += clen; 221 len -= clen; 222 if (ptr == 64) { 223 br_sha2small_round(cc->buf, cc->val); 224 ptr = 0; 225 } 226 } 227 } 228 229 static void 230 sha2small_out(const br_sha224_context *cc, void *dst, int num) 231 { 232 unsigned char buf[64]; 233 uint32_t val[8]; 234 size_t ptr; 235 236 ptr = (size_t)cc->count & 63; 237 memcpy(buf, cc->buf, ptr); 238 memcpy(val, cc->val, sizeof val); 239 buf[ptr ++] = 0x80; 240 if (ptr > 56) { 241 memset(buf + ptr, 0, 64 - ptr); 242 br_sha2small_round(buf, val); 243 memset(buf, 0, 56); 244 } else { 245 memset(buf + ptr, 0, 56 - ptr); 246 } 247 br_enc64be(buf + 56, cc->count << 3); 248 br_sha2small_round(buf, val); 249 br_range_enc32be(dst, val, num); 250 } 251 252 /* see bearssl.h */ 253 void 254 br_sha224_init(br_sha224_context *cc) 255 { 256 cc->vtable = &br_sha224_vtable; 257 memcpy(cc->val, br_sha224_IV, sizeof cc->val); 258 cc->count = 0; 259 } 260 261 /* see bearssl.h */ 262 void 263 br_sha224_update(br_sha224_context *cc, const void *data, size_t len) 264 { 265 sha2small_update(cc, data, len); 266 } 267 268 /* see bearssl.h */ 269 void 270 br_sha224_out(const br_sha224_context *cc, void *dst) 271 { 272 sha2small_out(cc, dst, 7); 273 } 274 275 /* see bearssl.h */ 276 uint64_t 277 br_sha224_state(const br_sha224_context *cc, void *dst) 278 { 279 br_range_enc32be(dst, cc->val, 8); 280 return cc->count; 281 } 282 283 /* see bearssl.h */ 284 void 285 br_sha224_set_state(br_sha224_context *cc, const void *stb, uint64_t count) 286 { 287 br_range_dec32be(cc->val, 8, stb); 288 cc->count = count; 289 } 290 291 /* see bearssl.h */ 292 void 293 br_sha256_init(br_sha256_context *cc) 294 { 295 cc->vtable = &br_sha256_vtable; 296 memcpy(cc->val, br_sha256_IV, sizeof cc->val); 297 cc->count = 0; 298 } 299 300 /* see bearssl.h */ 301 void 302 br_sha256_out(const br_sha256_context *cc, void *dst) 303 { 304 sha2small_out(cc, dst, 8); 305 } 306 307 /* see bearssl.h */ 308 const br_hash_class br_sha224_vtable = { 309 sizeof(br_sha224_context), 310 BR_HASHDESC_ID(br_sha224_ID) 311 | BR_HASHDESC_OUT(28) 312 | BR_HASHDESC_STATE(32) 313 | BR_HASHDESC_LBLEN(6) 314 | BR_HASHDESC_MD_PADDING 315 | BR_HASHDESC_MD_PADDING_BE, 316 (void (*)(const br_hash_class **))&br_sha224_init, 317 (void (*)(const br_hash_class **, 318 const void *, size_t))&br_sha224_update, 319 (void (*)(const br_hash_class *const *, void *))&br_sha224_out, 320 (uint64_t (*)(const br_hash_class *const *, void *))&br_sha224_state, 321 (void (*)(const br_hash_class **, const void *, uint64_t)) 322 &br_sha224_set_state 323 }; 324 325 /* see bearssl.h */ 326 const br_hash_class br_sha256_vtable = { 327 sizeof(br_sha256_context), 328 BR_HASHDESC_ID(br_sha256_ID) 329 | BR_HASHDESC_OUT(32) 330 | BR_HASHDESC_STATE(32) 331 | BR_HASHDESC_LBLEN(6) 332 | BR_HASHDESC_MD_PADDING 333 | BR_HASHDESC_MD_PADDING_BE, 334 (void (*)(const br_hash_class **))&br_sha256_init, 335 (void (*)(const br_hash_class **, 336 const void *, size_t))&br_sha256_update, 337 (void (*)(const br_hash_class *const *, void *))&br_sha256_out, 338 (uint64_t (*)(const br_hash_class *const *, void *))&br_sha256_state, 339 (void (*)(const br_hash_class **, const void *, uint64_t)) 340 &br_sha256_set_state 341 };