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1/* SHA-256 and SHA-512 implementation based on code by Oliver Gay
2 * <olivier.gay@a3.epfl.ch> under a BSD-style license. See below.
3 */
4
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 * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch>
11 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the project nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38#include "avb_sha.h"
39
40#define SHFR(x, n) (x >> n)
41#define ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n)))
42#define ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n)))
43#define CH(x, y, z) ((x & y) ^ (~x & z))
44#define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
45
46#define SHA256_F1(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
47#define SHA256_F2(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
48#define SHA256_F3(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHFR(x, 3))
49#define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10))
50
51#define UNPACK32(x, str) \
52 { \
53 *((str) + 3) = (uint8_t)((x)); \
54 *((str) + 2) = (uint8_t)((x) >> 8); \
55 *((str) + 1) = (uint8_t)((x) >> 16); \
56 *((str) + 0) = (uint8_t)((x) >> 24); \
57 }
58
59#define PACK32(str, x) \
60 { \
61 *(x) = ((uint32_t) * ((str) + 3)) | ((uint32_t) * ((str) + 2) << 8) | \
62 ((uint32_t) * ((str) + 1) << 16) | \
63 ((uint32_t) * ((str) + 0) << 24); \
64 }
65
66/* Macros used for loops unrolling */
67
68#define SHA256_SCR(i) \
69 { w[i] = SHA256_F4(w[i - 2]) + w[i - 7] + SHA256_F3(w[i - 15]) + w[i - 16]; }
70
71#define SHA256_EXP(a, b, c, d, e, f, g, h, j) \
72 { \
73 t1 = wv[h] + SHA256_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) + sha256_k[j] + \
74 w[j]; \
75 t2 = SHA256_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]); \
76 wv[d] += t1; \
77 wv[h] = t1 + t2; \
78 }
79
80static const uint32_t sha256_h0[8] = {0x6a09e667,
81 0xbb67ae85,
82 0x3c6ef372,
83 0xa54ff53a,
84 0x510e527f,
85 0x9b05688c,
86 0x1f83d9ab,
87 0x5be0cd19};
88
89static const uint32_t sha256_k[64] = {
90 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
91 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
92 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
93 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
94 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
95 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
96 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
97 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
98 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
99 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
100 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
101
102/* SHA-256 implementation */
103void avb_sha256_init(AvbSHA256Ctx* ctx) {
104#ifndef UNROLL_LOOPS
105 int i;
106 for (i = 0; i < 8; i++) {
107 ctx->h[i] = sha256_h0[i];
108 }
109#else
110 ctx->h[0] = sha256_h0[0];
111 ctx->h[1] = sha256_h0[1];
112 ctx->h[2] = sha256_h0[2];
113 ctx->h[3] = sha256_h0[3];
114 ctx->h[4] = sha256_h0[4];
115 ctx->h[5] = sha256_h0[5];
116 ctx->h[6] = sha256_h0[6];
117 ctx->h[7] = sha256_h0[7];
118#endif /* !UNROLL_LOOPS */
119
120 ctx->len = 0;
121 ctx->tot_len = 0;
122}
123
124static void SHA256_transform(AvbSHA256Ctx* ctx,
125 const uint8_t* message,
126 unsigned int block_nb) {
127 uint32_t w[64];
128 uint32_t wv[8];
129 uint32_t t1, t2;
130 const unsigned char* sub_block;
131 int i;
132
133#ifndef UNROLL_LOOPS
134 int j;
135#endif
136
137 for (i = 0; i < (int)block_nb; i++) {
138 sub_block = message + (i << 6);
139
140#ifndef UNROLL_LOOPS
141 for (j = 0; j < 16; j++) {
142 PACK32(&sub_block[j << 2], &w[j]);
143 }
144
145 for (j = 16; j < 64; j++) {
146 SHA256_SCR(j);
147 }
148
149 for (j = 0; j < 8; j++) {
150 wv[j] = ctx->h[j];
151 }
152
153 for (j = 0; j < 64; j++) {
154 t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6]) + sha256_k[j] +
155 w[j];
156 t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
157 wv[7] = wv[6];
158 wv[6] = wv[5];
159 wv[5] = wv[4];
160 wv[4] = wv[3] + t1;
161 wv[3] = wv[2];
162 wv[2] = wv[1];
163 wv[1] = wv[0];
164 wv[0] = t1 + t2;
165 }
166
167 for (j = 0; j < 8; j++) {
168 ctx->h[j] += wv[j];
169 }
170#else
171 PACK32(&sub_block[0], &w[0]);
172 PACK32(&sub_block[4], &w[1]);
173 PACK32(&sub_block[8], &w[2]);
174 PACK32(&sub_block[12], &w[3]);
175 PACK32(&sub_block[16], &w[4]);
176 PACK32(&sub_block[20], &w[5]);
177 PACK32(&sub_block[24], &w[6]);
178 PACK32(&sub_block[28], &w[7]);
179 PACK32(&sub_block[32], &w[8]);
180 PACK32(&sub_block[36], &w[9]);
181 PACK32(&sub_block[40], &w[10]);
182 PACK32(&sub_block[44], &w[11]);
183 PACK32(&sub_block[48], &w[12]);
184 PACK32(&sub_block[52], &w[13]);
185 PACK32(&sub_block[56], &w[14]);
186 PACK32(&sub_block[60], &w[15]);
187
188 SHA256_SCR(16);
189 SHA256_SCR(17);
190 SHA256_SCR(18);
191 SHA256_SCR(19);
192 SHA256_SCR(20);
193 SHA256_SCR(21);
194 SHA256_SCR(22);
195 SHA256_SCR(23);
196 SHA256_SCR(24);
197 SHA256_SCR(25);
198 SHA256_SCR(26);
199 SHA256_SCR(27);
200 SHA256_SCR(28);
201 SHA256_SCR(29);
202 SHA256_SCR(30);
203 SHA256_SCR(31);
204 SHA256_SCR(32);
205 SHA256_SCR(33);
206 SHA256_SCR(34);
207 SHA256_SCR(35);
208 SHA256_SCR(36);
209 SHA256_SCR(37);
210 SHA256_SCR(38);
211 SHA256_SCR(39);
212 SHA256_SCR(40);
213 SHA256_SCR(41);
214 SHA256_SCR(42);
215 SHA256_SCR(43);
216 SHA256_SCR(44);
217 SHA256_SCR(45);
218 SHA256_SCR(46);
219 SHA256_SCR(47);
220 SHA256_SCR(48);
221 SHA256_SCR(49);
222 SHA256_SCR(50);
223 SHA256_SCR(51);
224 SHA256_SCR(52);
225 SHA256_SCR(53);
226 SHA256_SCR(54);
227 SHA256_SCR(55);
228 SHA256_SCR(56);
229 SHA256_SCR(57);
230 SHA256_SCR(58);
231 SHA256_SCR(59);
232 SHA256_SCR(60);
233 SHA256_SCR(61);
234 SHA256_SCR(62);
235 SHA256_SCR(63);
236
237 wv[0] = ctx->h[0];
238 wv[1] = ctx->h[1];
239 wv[2] = ctx->h[2];
240 wv[3] = ctx->h[3];
241 wv[4] = ctx->h[4];
242 wv[5] = ctx->h[5];
243 wv[6] = ctx->h[6];
244 wv[7] = ctx->h[7];
245
246 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 0);
247 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 1);
248 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 2);
249 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 3);
250 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 4);
251 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 5);
252 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 6);
253 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 7);
254 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 8);
255 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 9);
256 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 10);
257 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 11);
258 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 12);
259 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 13);
260 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 14);
261 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 15);
262 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 16);
263 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 17);
264 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 18);
265 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 19);
266 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 20);
267 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 21);
268 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 22);
269 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 23);
270 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 24);
271 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 25);
272 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 26);
273 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 27);
274 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 28);
275 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 29);
276 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 30);
277 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 31);
278 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 32);
279 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 33);
280 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 34);
281 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 35);
282 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 36);
283 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 37);
284 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 38);
285 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 39);
286 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 40);
287 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 41);
288 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 42);
289 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 43);
290 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 44);
291 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 45);
292 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 46);
293 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 47);
294 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 48);
295 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 49);
296 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 50);
297 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 51);
298 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 52);
299 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 53);
300 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 54);
301 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 55);
302 SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 56);
303 SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 57);
304 SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 58);
305 SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 59);
306 SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 60);
307 SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 61);
308 SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 62);
309 SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 63);
310
311 ctx->h[0] += wv[0];
312 ctx->h[1] += wv[1];
313 ctx->h[2] += wv[2];
314 ctx->h[3] += wv[3];
315 ctx->h[4] += wv[4];
316 ctx->h[5] += wv[5];
317 ctx->h[6] += wv[6];
318 ctx->h[7] += wv[7];
319#endif /* !UNROLL_LOOPS */
320 }
321}
322
323void avb_sha256_update(AvbSHA256Ctx* ctx, const uint8_t* data, uint32_t len) {
324 unsigned int block_nb;
325 unsigned int new_len, rem_len, tmp_len;
326 const uint8_t* shifted_data;
327
328 tmp_len = AVB_SHA256_BLOCK_SIZE - ctx->len;
329 rem_len = len < tmp_len ? len : tmp_len;
330
331 avb_memcpy(&ctx->block[ctx->len], data, rem_len);
332
333 if (ctx->len + len < AVB_SHA256_BLOCK_SIZE) {
334 ctx->len += len;
335 return;
336 }
337
338 new_len = len - rem_len;
339 block_nb = new_len / AVB_SHA256_BLOCK_SIZE;
340
341 shifted_data = data + rem_len;
342
343 SHA256_transform(ctx, ctx->block, 1);
344 SHA256_transform(ctx, shifted_data, block_nb);
345
346 rem_len = new_len % AVB_SHA256_BLOCK_SIZE;
347
348 avb_memcpy(ctx->block, &shifted_data[block_nb << 6], rem_len);
349
350 ctx->len = rem_len;
351 ctx->tot_len += (block_nb + 1) << 6;
352}
353
354uint8_t* avb_sha256_final(AvbSHA256Ctx* ctx) {
355 unsigned int block_nb;
356 unsigned int pm_len;
357 unsigned int len_b;
358#ifndef UNROLL_LOOPS
359 int i;
360#endif
361
362 block_nb =
363 (1 + ((AVB_SHA256_BLOCK_SIZE - 9) < (ctx->len % AVB_SHA256_BLOCK_SIZE)));
364
365 len_b = (ctx->tot_len + ctx->len) << 3;
366 pm_len = block_nb << 6;
367
368 avb_memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
369 ctx->block[ctx->len] = 0x80;
370 UNPACK32(len_b, ctx->block + pm_len - 4);
371
372 SHA256_transform(ctx, ctx->block, block_nb);
373
374#ifndef UNROLL_LOOPS
375 for (i = 0; i < 8; i++) {
376 UNPACK32(ctx->h[i], &ctx->buf[i << 2]);
377 }
378#else
379 UNPACK32(ctx->h[0], &ctx->buf[0]);
380 UNPACK32(ctx->h[1], &ctx->buf[4]);
381 UNPACK32(ctx->h[2], &ctx->buf[8]);
382 UNPACK32(ctx->h[3], &ctx->buf[12]);
383 UNPACK32(ctx->h[4], &ctx->buf[16]);
384 UNPACK32(ctx->h[5], &ctx->buf[20]);
385 UNPACK32(ctx->h[6], &ctx->buf[24]);
386 UNPACK32(ctx->h[7], &ctx->buf[28]);
387#endif /* !UNROLL_LOOPS */
388
389 return ctx->buf;
390}
391
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