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 PACK32(str, x) \
33 { \
34 *(x) = ((uint32_t) * ((str) + 3)) | ((uint32_t) * ((str) + 2) << 8) | \
35 ((uint32_t) * ((str) + 1) << 16) | \
36 ((uint32_t) * ((str) + 0) << 24); \
37 }
38
39 /* Macros used for loops unrolling */
40
41 #define SHA256_SCR(i) \
42 { w[i] = SHA256_F4(w[i - 2]) + w[i - 7] + SHA256_F3(w[i - 15]) + w[i - 16]; }
43
44 #define SHA256_EXP(a, b, c, d, e, f, g, h, j) \
45 { \
46 t1 = wv[h] + SHA256_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) + sha256_k[j] + \
47 w[j]; \
48 t2 = SHA256_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]); \
49 wv[d] += t1; \
50 wv[h] = t1 + t2; \
51 }
52
53 static const uint32_t sha256_h0[8] = {0x6a09e667,
54 0xbb67ae85,
55 0x3c6ef372,
56 0xa54ff53a,
57 0x510e527f,
58 0x9b05688c,
59 0x1f83d9ab,
60 0x5be0cd19};
61
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};
74
75 /* SHA-256 implementation */
avb_sha256_init(AvbSHA256Ctx * ctx)76 void avb_sha256_init(AvbSHA256Ctx* ctx) {
77 #ifndef UNROLL_LOOPS
78 int i;
79 for (i = 0; i < 8; i++) {
80 ctx->h[i] = sha256_h0[i];
81 }
82 #else
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 */
92
93 ctx->len = 0;
94 ctx->tot_len = 0;
95 }
96
SHA256_transform(AvbSHA256Ctx * ctx,const uint8_t * message,unsigned int block_nb)97 static void SHA256_transform(AvbSHA256Ctx* ctx,
98 const uint8_t* message,
99 unsigned int block_nb) {
100 uint32_t w[64];
101 uint32_t wv[8];
102 uint32_t t1, t2;
103 const unsigned char* sub_block;
104 int i;
105
106 #ifndef UNROLL_LOOPS
107 int j;
108 #endif
109
110 for (i = 0; i < (int)block_nb; i++) {
111 sub_block = message + (i << 6);
112
113 #ifndef UNROLL_LOOPS
114 for (j = 0; j < 16; j++) {
115 PACK32(&sub_block[j << 2], &w[j]);
116 }
117
118 for (j = 16; j < 64; j++) {
119 SHA256_SCR(j);
120 }
121
122 for (j = 0; j < 8; j++) {
123 wv[j] = ctx->h[j];
124 }
125
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] +
128 w[j];
129 t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
130 wv[7] = wv[6];
131 wv[6] = wv[5];
132 wv[5] = wv[4];
133 wv[4] = wv[3] + t1;
134 wv[3] = wv[2];
135 wv[2] = wv[1];
136 wv[1] = wv[0];
137 wv[0] = t1 + t2;
138 }
139
140 for (j = 0; j < 8; j++) {
141 ctx->h[j] += wv[j];
142 }
143 #else
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]);
160
161 SHA256_SCR(16);
162 SHA256_SCR(17);
163 SHA256_SCR(18);
164 SHA256_SCR(19);
165 SHA256_SCR(20);
166 SHA256_SCR(21);
167 SHA256_SCR(22);
168 SHA256_SCR(23);
169 SHA256_SCR(24);
170 SHA256_SCR(25);
171 SHA256_SCR(26);
172 SHA256_SCR(27);
173 SHA256_SCR(28);
174 SHA256_SCR(29);
175 SHA256_SCR(30);
176 SHA256_SCR(31);
177 SHA256_SCR(32);
178 SHA256_SCR(33);
179 SHA256_SCR(34);
180 SHA256_SCR(35);
181 SHA256_SCR(36);
182 SHA256_SCR(37);
183 SHA256_SCR(38);
184 SHA256_SCR(39);
185 SHA256_SCR(40);
186 SHA256_SCR(41);
187 SHA256_SCR(42);
188 SHA256_SCR(43);
189 SHA256_SCR(44);
190 SHA256_SCR(45);
191 SHA256_SCR(46);
192 SHA256_SCR(47);
193 SHA256_SCR(48);
194 SHA256_SCR(49);
195 SHA256_SCR(50);
196 SHA256_SCR(51);
197 SHA256_SCR(52);
198 SHA256_SCR(53);
199 SHA256_SCR(54);
200 SHA256_SCR(55);
201 SHA256_SCR(56);
202 SHA256_SCR(57);
203 SHA256_SCR(58);
204 SHA256_SCR(59);
205 SHA256_SCR(60);
206 SHA256_SCR(61);
207 SHA256_SCR(62);
208 SHA256_SCR(63);
209
210 wv[0] = ctx->h[0];
211 wv[1] = ctx->h[1];
212 wv[2] = ctx->h[2];
213 wv[3] = ctx->h[3];
214 wv[4] = ctx->h[4];
215 wv[5] = ctx->h[5];
216 wv[6] = ctx->h[6];
217 wv[7] = ctx->h[7];
218
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);
283
284 ctx->h[0] += wv[0];
285 ctx->h[1] += wv[1];
286 ctx->h[2] += wv[2];
287 ctx->h[3] += wv[3];
288 ctx->h[4] += wv[4];
289 ctx->h[5] += wv[5];
290 ctx->h[6] += wv[6];
291 ctx->h[7] += wv[7];
292 #endif /* !UNROLL_LOOPS */
293 }
294 }
295
avb_sha256_update(AvbSHA256Ctx * ctx,const uint8_t * data,uint32_t len)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;
300
301 tmp_len = AVB_SHA256_BLOCK_SIZE - ctx->len;
302 rem_len = len < tmp_len ? len : tmp_len;
303
304 avb_memcpy(&ctx->block[ctx->len], data, rem_len);
305
306 if (ctx->len + len < AVB_SHA256_BLOCK_SIZE) {
307 ctx->len += len;
308 return;
309 }
310
311 new_len = len - rem_len;
312 block_nb = new_len / AVB_SHA256_BLOCK_SIZE;
313
314 shifted_data = data + rem_len;
315
316 SHA256_transform(ctx, ctx->block, 1);
317 SHA256_transform(ctx, shifted_data, block_nb);
318
319 rem_len = new_len % AVB_SHA256_BLOCK_SIZE;
320
321 avb_memcpy(ctx->block, &shifted_data[block_nb << 6], rem_len);
322
323 ctx->len = rem_len;
324 ctx->tot_len += (block_nb + 1) << 6;
325 }
326
avb_sha256_final(AvbSHA256Ctx * ctx)327 uint8_t* avb_sha256_final(AvbSHA256Ctx* ctx) {
328 unsigned int block_nb;
329 unsigned int pm_len;
330 unsigned int len_b;
331 #ifndef UNROLL_LOOPS
332 int i;
333 #endif
334
335 block_nb =
336 (1 + ((AVB_SHA256_BLOCK_SIZE - 9) < (ctx->len % AVB_SHA256_BLOCK_SIZE)));
337
338 len_b = (ctx->tot_len + ctx->len) << 3;
339 pm_len = block_nb << 6;
340
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);
344
345 SHA256_transform(ctx, ctx->block, block_nb);
346
347 #ifndef UNROLL_LOOPS
348 for (i = 0; i < 8; i++) {
349 UNPACK32(ctx->h[i], &ctx->buf[i << 2]);
350 }
351 #else
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 */
361
362 return ctx->buf;
363 }
364