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 SHA512_F1(x) (ROTR(x, 28) ^ ROTR(x, 34) ^ ROTR(x, 39))
20 #define SHA512_F2(x) (ROTR(x, 14) ^ ROTR(x, 18) ^ ROTR(x, 41))
21 #define SHA512_F3(x) (ROTR(x, 1) ^ ROTR(x, 8) ^ SHFR(x, 7))
22 #define SHA512_F4(x) (ROTR(x, 19) ^ ROTR(x, 61) ^ SHFR(x, 6))
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 PACK64(str, x) \
45 { \
46 *(x) = \
47 ((uint64_t) * ((str) + 7)) | ((uint64_t) * ((str) + 6) << 8) | \
48 ((uint64_t) * ((str) + 5) << 16) | ((uint64_t) * ((str) + 4) << 24) | \
49 ((uint64_t) * ((str) + 3) << 32) | ((uint64_t) * ((str) + 2) << 40) | \
50 ((uint64_t) * ((str) + 1) << 48) | ((uint64_t) * ((str) + 0) << 56); \
51 }
52
53 /* Macros used for loops unrolling */
54
55 #define SHA512_SCR(i) \
56 { w[i] = SHA512_F4(w[i - 2]) + w[i - 7] + SHA512_F3(w[i - 15]) + w[i - 16]; }
57
58 #define SHA512_EXP(a, b, c, d, e, f, g, h, j) \
59 { \
60 t1 = wv[h] + SHA512_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) + sha512_k[j] + \
61 w[j]; \
62 t2 = SHA512_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]); \
63 wv[d] += t1; \
64 wv[h] = t1 + t2; \
65 }
66
67 static const uint64_t sha512_h0[8] = {0x6a09e667f3bcc908ULL,
68 0xbb67ae8584caa73bULL,
69 0x3c6ef372fe94f82bULL,
70 0xa54ff53a5f1d36f1ULL,
71 0x510e527fade682d1ULL,
72 0x9b05688c2b3e6c1fULL,
73 0x1f83d9abfb41bd6bULL,
74 0x5be0cd19137e2179ULL};
75
76 static const uint64_t sha512_k[80] = {
77 0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
78 0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
79 0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
80 0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
81 0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
82 0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
83 0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
84 0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
85 0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
86 0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
87 0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
88 0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
89 0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
90 0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
91 0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
92 0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
93 0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
94 0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
95 0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
96 0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
97 0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
98 0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
99 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
100 0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
101 0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
102 0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
103 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL};
104
105 /* SHA-512 implementation */
106
avb_sha512_init(AvbSHA512Ctx * ctx)107 void avb_sha512_init(AvbSHA512Ctx* ctx) {
108 #ifdef UNROLL_LOOPS_SHA512
109 ctx->h[0] = sha512_h0[0];
110 ctx->h[1] = sha512_h0[1];
111 ctx->h[2] = sha512_h0[2];
112 ctx->h[3] = sha512_h0[3];
113 ctx->h[4] = sha512_h0[4];
114 ctx->h[5] = sha512_h0[5];
115 ctx->h[6] = sha512_h0[6];
116 ctx->h[7] = sha512_h0[7];
117 #else
118 int i;
119
120 for (i = 0; i < 8; i++)
121 ctx->h[i] = sha512_h0[i];
122 #endif /* UNROLL_LOOPS_SHA512 */
123
124 ctx->len = 0;
125 ctx->tot_len = 0;
126 }
127
SHA512_transform(AvbSHA512Ctx * ctx,const uint8_t * message,unsigned int block_nb)128 static void SHA512_transform(AvbSHA512Ctx* ctx,
129 const uint8_t* message,
130 unsigned int block_nb) {
131 uint64_t w[80];
132 uint64_t wv[8];
133 uint64_t t1, t2;
134 const uint8_t* sub_block;
135 int i, j;
136
137 for (i = 0; i < (int)block_nb; i++) {
138 sub_block = message + (i << 7);
139
140 #ifdef UNROLL_LOOPS_SHA512
141 PACK64(&sub_block[0], &w[0]);
142 PACK64(&sub_block[8], &w[1]);
143 PACK64(&sub_block[16], &w[2]);
144 PACK64(&sub_block[24], &w[3]);
145 PACK64(&sub_block[32], &w[4]);
146 PACK64(&sub_block[40], &w[5]);
147 PACK64(&sub_block[48], &w[6]);
148 PACK64(&sub_block[56], &w[7]);
149 PACK64(&sub_block[64], &w[8]);
150 PACK64(&sub_block[72], &w[9]);
151 PACK64(&sub_block[80], &w[10]);
152 PACK64(&sub_block[88], &w[11]);
153 PACK64(&sub_block[96], &w[12]);
154 PACK64(&sub_block[104], &w[13]);
155 PACK64(&sub_block[112], &w[14]);
156 PACK64(&sub_block[120], &w[15]);
157
158 SHA512_SCR(16);
159 SHA512_SCR(17);
160 SHA512_SCR(18);
161 SHA512_SCR(19);
162 SHA512_SCR(20);
163 SHA512_SCR(21);
164 SHA512_SCR(22);
165 SHA512_SCR(23);
166 SHA512_SCR(24);
167 SHA512_SCR(25);
168 SHA512_SCR(26);
169 SHA512_SCR(27);
170 SHA512_SCR(28);
171 SHA512_SCR(29);
172 SHA512_SCR(30);
173 SHA512_SCR(31);
174 SHA512_SCR(32);
175 SHA512_SCR(33);
176 SHA512_SCR(34);
177 SHA512_SCR(35);
178 SHA512_SCR(36);
179 SHA512_SCR(37);
180 SHA512_SCR(38);
181 SHA512_SCR(39);
182 SHA512_SCR(40);
183 SHA512_SCR(41);
184 SHA512_SCR(42);
185 SHA512_SCR(43);
186 SHA512_SCR(44);
187 SHA512_SCR(45);
188 SHA512_SCR(46);
189 SHA512_SCR(47);
190 SHA512_SCR(48);
191 SHA512_SCR(49);
192 SHA512_SCR(50);
193 SHA512_SCR(51);
194 SHA512_SCR(52);
195 SHA512_SCR(53);
196 SHA512_SCR(54);
197 SHA512_SCR(55);
198 SHA512_SCR(56);
199 SHA512_SCR(57);
200 SHA512_SCR(58);
201 SHA512_SCR(59);
202 SHA512_SCR(60);
203 SHA512_SCR(61);
204 SHA512_SCR(62);
205 SHA512_SCR(63);
206 SHA512_SCR(64);
207 SHA512_SCR(65);
208 SHA512_SCR(66);
209 SHA512_SCR(67);
210 SHA512_SCR(68);
211 SHA512_SCR(69);
212 SHA512_SCR(70);
213 SHA512_SCR(71);
214 SHA512_SCR(72);
215 SHA512_SCR(73);
216 SHA512_SCR(74);
217 SHA512_SCR(75);
218 SHA512_SCR(76);
219 SHA512_SCR(77);
220 SHA512_SCR(78);
221 SHA512_SCR(79);
222
223 wv[0] = ctx->h[0];
224 wv[1] = ctx->h[1];
225 wv[2] = ctx->h[2];
226 wv[3] = ctx->h[3];
227 wv[4] = ctx->h[4];
228 wv[5] = ctx->h[5];
229 wv[6] = ctx->h[6];
230 wv[7] = ctx->h[7];
231
232 j = 0;
233
234 do {
235 SHA512_EXP(0, 1, 2, 3, 4, 5, 6, 7, j);
236 j++;
237 SHA512_EXP(7, 0, 1, 2, 3, 4, 5, 6, j);
238 j++;
239 SHA512_EXP(6, 7, 0, 1, 2, 3, 4, 5, j);
240 j++;
241 SHA512_EXP(5, 6, 7, 0, 1, 2, 3, 4, j);
242 j++;
243 SHA512_EXP(4, 5, 6, 7, 0, 1, 2, 3, j);
244 j++;
245 SHA512_EXP(3, 4, 5, 6, 7, 0, 1, 2, j);
246 j++;
247 SHA512_EXP(2, 3, 4, 5, 6, 7, 0, 1, j);
248 j++;
249 SHA512_EXP(1, 2, 3, 4, 5, 6, 7, 0, j);
250 j++;
251 } while (j < 80);
252
253 ctx->h[0] += wv[0];
254 ctx->h[1] += wv[1];
255 ctx->h[2] += wv[2];
256 ctx->h[3] += wv[3];
257 ctx->h[4] += wv[4];
258 ctx->h[5] += wv[5];
259 ctx->h[6] += wv[6];
260 ctx->h[7] += wv[7];
261 #else
262 for (j = 0; j < 16; j++) {
263 PACK64(&sub_block[j << 3], &w[j]);
264 }
265
266 for (j = 16; j < 80; j++) {
267 SHA512_SCR(j);
268 }
269
270 for (j = 0; j < 8; j++) {
271 wv[j] = ctx->h[j];
272 }
273
274 for (j = 0; j < 80; j++) {
275 t1 = wv[7] + SHA512_F2(wv[4]) + CH(wv[4], wv[5], wv[6]) + sha512_k[j] +
276 w[j];
277 t2 = SHA512_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
278 wv[7] = wv[6];
279 wv[6] = wv[5];
280 wv[5] = wv[4];
281 wv[4] = wv[3] + t1;
282 wv[3] = wv[2];
283 wv[2] = wv[1];
284 wv[1] = wv[0];
285 wv[0] = t1 + t2;
286 }
287
288 for (j = 0; j < 8; j++)
289 ctx->h[j] += wv[j];
290 #endif /* UNROLL_LOOPS_SHA512 */
291 }
292 }
293
avb_sha512_update(AvbSHA512Ctx * ctx,const uint8_t * data,uint32_t len)294 void avb_sha512_update(AvbSHA512Ctx* ctx, const uint8_t* data, uint32_t len) {
295 unsigned int block_nb;
296 unsigned int new_len, rem_len, tmp_len;
297 const uint8_t* shifted_data;
298
299 tmp_len = AVB_SHA512_BLOCK_SIZE - ctx->len;
300 rem_len = len < tmp_len ? len : tmp_len;
301
302 avb_memcpy(&ctx->block[ctx->len], data, rem_len);
303
304 if (ctx->len + len < AVB_SHA512_BLOCK_SIZE) {
305 ctx->len += len;
306 return;
307 }
308
309 new_len = len - rem_len;
310 block_nb = new_len / AVB_SHA512_BLOCK_SIZE;
311
312 shifted_data = data + rem_len;
313
314 SHA512_transform(ctx, ctx->block, 1);
315 SHA512_transform(ctx, shifted_data, block_nb);
316
317 rem_len = new_len % AVB_SHA512_BLOCK_SIZE;
318
319 avb_memcpy(ctx->block, &shifted_data[block_nb << 7], rem_len);
320
321 ctx->len = rem_len;
322 ctx->tot_len += (block_nb + 1) << 7;
323 }
324
avb_sha512_final(AvbSHA512Ctx * ctx)325 uint8_t* avb_sha512_final(AvbSHA512Ctx* ctx) {
326 unsigned int block_nb;
327 unsigned int pm_len;
328 unsigned int len_b;
329
330 #ifndef UNROLL_LOOPS_SHA512
331 int i;
332 #endif
333
334 block_nb =
335 1 + ((AVB_SHA512_BLOCK_SIZE - 17) < (ctx->len % AVB_SHA512_BLOCK_SIZE));
336
337 len_b = (ctx->tot_len + ctx->len) << 3;
338 pm_len = block_nb << 7;
339
340 avb_memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
341 ctx->block[ctx->len] = 0x80;
342 UNPACK32(len_b, ctx->block + pm_len - 4);
343
344 SHA512_transform(ctx, ctx->block, block_nb);
345
346 #ifdef UNROLL_LOOPS_SHA512
347 UNPACK64(ctx->h[0], &ctx->buf[0]);
348 UNPACK64(ctx->h[1], &ctx->buf[8]);
349 UNPACK64(ctx->h[2], &ctx->buf[16]);
350 UNPACK64(ctx->h[3], &ctx->buf[24]);
351 UNPACK64(ctx->h[4], &ctx->buf[32]);
352 UNPACK64(ctx->h[5], &ctx->buf[40]);
353 UNPACK64(ctx->h[6], &ctx->buf[48]);
354 UNPACK64(ctx->h[7], &ctx->buf[56]);
355 #else
356 for (i = 0; i < 8; i++)
357 UNPACK64(ctx->h[i], &ctx->buf[i << 3]);
358 #endif /* UNROLL_LOOPS_SHA512 */
359
360 return ctx->buf;
361 }
362