1 // SPDX-License-Identifier: BSD-3-Clause
3 * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch>
6 * FIPS 180-2 SHA-224/256/384/512 implementation
7 * Last update: 02/02/2007
8 * Issue date: 04/30/2005
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))
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))
24 #define UNPACK32(x, str) \
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); \
32 #define PACK32(str, x) \
34 *(x) = ((uint32_t) * ((str) + 3)) | ((uint32_t) * ((str) + 2) << 8) | \
35 ((uint32_t) * ((str) + 1) << 16) | \
36 ((uint32_t) * ((str) + 0) << 24); \
39 /* Macros used for loops unrolling */
41 #define SHA256_SCR(i) \
42 { w[i] = SHA256_F4(w[i - 2]) + w[i - 7] + SHA256_F3(w[i - 15]) + w[i - 16]; }
44 #define SHA256_EXP(a, b, c, d, e, f, g, h, j) \
46 t1 = wv[h] + SHA256_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) + sha256_k[j] + \
48 t2 = SHA256_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]); \
53 static const uint32_t sha256_h0[8] = {0x6a09e667,
62 static const uint32_t sha256_k[64] = {
63 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
64 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
65 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
66 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
67 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
68 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
69 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
70 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
71 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
72 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
73 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
75 /* SHA-256 implementation */
76 void avb_sha256_init(AvbSHA256Ctx* ctx) {
79 for (i = 0; i < 8; i++) {
80 ctx->h[i] = sha256_h0[i];
83 ctx->h[0] = sha256_h0[0];
84 ctx->h[1] = sha256_h0[1];
85 ctx->h[2] = sha256_h0[2];
86 ctx->h[3] = sha256_h0[3];
87 ctx->h[4] = sha256_h0[4];
88 ctx->h[5] = sha256_h0[5];
89 ctx->h[6] = sha256_h0[6];
90 ctx->h[7] = sha256_h0[7];
91 #endif /* !UNROLL_LOOPS */
97 static void SHA256_transform(AvbSHA256Ctx* ctx,
98 const uint8_t* message,
99 unsigned int block_nb) {
103 const unsigned char* sub_block;
110 for (i = 0; i < (int)block_nb; i++) {
111 sub_block = message + (i << 6);
114 for (j = 0; j < 16; j++) {
115 PACK32(&sub_block[j << 2], &w[j]);
118 for (j = 16; j < 64; j++) {
122 for (j = 0; j < 8; j++) {
126 for (j = 0; j < 64; j++) {
127 t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6]) + sha256_k[j] +
129 t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
140 for (j = 0; j < 8; j++) {
144 PACK32(&sub_block[0], &w[0]);
145 PACK32(&sub_block[4], &w[1]);
146 PACK32(&sub_block[8], &w[2]);
147 PACK32(&sub_block[12], &w[3]);
148 PACK32(&sub_block[16], &w[4]);
149 PACK32(&sub_block[20], &w[5]);
150 PACK32(&sub_block[24], &w[6]);
151 PACK32(&sub_block[28], &w[7]);
152 PACK32(&sub_block[32], &w[8]);
153 PACK32(&sub_block[36], &w[9]);
154 PACK32(&sub_block[40], &w[10]);
155 PACK32(&sub_block[44], &w[11]);
156 PACK32(&sub_block[48], &w[12]);
157 PACK32(&sub_block[52], &w[13]);
158 PACK32(&sub_block[56], &w[14]);
159 PACK32(&sub_block[60], &w[15]);
219 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 0);
220 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 1);
221 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 2);
222 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 3);
223 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 4);
224 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 5);
225 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 6);
226 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 7);
227 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 8);
228 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 9);
229 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 10);
230 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 11);
231 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 12);
232 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 13);
233 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 14);
234 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 15);
235 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 16);
236 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 17);
237 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 18);
238 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 19);
239 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 20);
240 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 21);
241 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 22);
242 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 23);
243 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 24);
244 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 25);
245 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 26);
246 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 27);
247 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 28);
248 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 29);
249 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 30);
250 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 31);
251 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 32);
252 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 33);
253 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 34);
254 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 35);
255 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 36);
256 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 37);
257 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 38);
258 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 39);
259 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 40);
260 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 41);
261 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 42);
262 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 43);
263 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 44);
264 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 45);
265 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 46);
266 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 47);
267 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 48);
268 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 49);
269 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 50);
270 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 51);
271 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 52);
272 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 53);
273 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 54);
274 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 55);
275 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 56);
276 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 57);
277 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 58);
278 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 59);
279 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 60);
280 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 61);
281 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 62);
282 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 63);
292 #endif /* !UNROLL_LOOPS */
296 void avb_sha256_update(AvbSHA256Ctx* ctx, const uint8_t* data, uint32_t len) {
297 unsigned int block_nb;
298 unsigned int new_len, rem_len, tmp_len;
299 const uint8_t* shifted_data;
301 tmp_len = AVB_SHA256_BLOCK_SIZE - ctx->len;
302 rem_len = len < tmp_len ? len : tmp_len;
304 avb_memcpy(&ctx->block[ctx->len], data, rem_len);
306 if (ctx->len + len < AVB_SHA256_BLOCK_SIZE) {
311 new_len = len - rem_len;
312 block_nb = new_len / AVB_SHA256_BLOCK_SIZE;
314 shifted_data = data + rem_len;
316 SHA256_transform(ctx, ctx->block, 1);
317 SHA256_transform(ctx, shifted_data, block_nb);
319 rem_len = new_len % AVB_SHA256_BLOCK_SIZE;
321 avb_memcpy(ctx->block, &shifted_data[block_nb << 6], rem_len);
324 ctx->tot_len += (block_nb + 1) << 6;
327 uint8_t* avb_sha256_final(AvbSHA256Ctx* ctx) {
328 unsigned int block_nb;
336 (1 + ((AVB_SHA256_BLOCK_SIZE - 9) < (ctx->len % AVB_SHA256_BLOCK_SIZE)));
338 len_b = (ctx->tot_len + ctx->len) << 3;
339 pm_len = block_nb << 6;
341 avb_memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
342 ctx->block[ctx->len] = 0x80;
343 UNPACK32(len_b, ctx->block + pm_len - 4);
345 SHA256_transform(ctx, ctx->block, block_nb);
348 for (i = 0; i < 8; i++) {
349 UNPACK32(ctx->h[i], &ctx->buf[i << 2]);
352 UNPACK32(ctx->h[0], &ctx->buf[0]);
353 UNPACK32(ctx->h[1], &ctx->buf[4]);
354 UNPACK32(ctx->h[2], &ctx->buf[8]);
355 UNPACK32(ctx->h[3], &ctx->buf[12]);
356 UNPACK32(ctx->h[4], &ctx->buf[16]);
357 UNPACK32(ctx->h[5], &ctx->buf[20]);
358 UNPACK32(ctx->h[6], &ctx->buf[24]);
359 UNPACK32(ctx->h[7], &ctx->buf[28]);
360 #endif /* !UNROLL_LOOPS */