xref: /openbmc/u-boot/lib/libavb/avb_sha256.c (revision 8e51c0f2) 
1 /*
2  * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch>
3  * All rights reserved.
4  *
5  * FIPS 180-2 SHA-224/256/384/512 implementation
6  * Last update: 02/02/2007
7  * Issue date:  04/30/2005
8  *
9  * SPDX-License-Identifier:	BSD-3-Clause
10  */
11 
12 #include "avb_sha.h"
13 
14 #define SHFR(x, n) (x >> n)
15 #define ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n)))
16 #define ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n)))
17 #define CH(x, y, z) ((x & y) ^ (~x & z))
18 #define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
19 
20 #define SHA256_F1(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
21 #define SHA256_F2(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
22 #define SHA256_F3(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHFR(x, 3))
23 #define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10))
24 
25 #define UNPACK32(x, str)                 \
26   {                                      \
27     *((str) + 3) = (uint8_t)((x));       \
28     *((str) + 2) = (uint8_t)((x) >> 8);  \
29     *((str) + 1) = (uint8_t)((x) >> 16); \
30     *((str) + 0) = (uint8_t)((x) >> 24); \
31   }
32 
33 #define PACK32(str, x)                                                    \
34   {                                                                       \
35     *(x) = ((uint32_t) * ((str) + 3)) | ((uint32_t) * ((str) + 2) << 8) | \
36            ((uint32_t) * ((str) + 1) << 16) |                             \
37            ((uint32_t) * ((str) + 0) << 24);                              \
38   }
39 
40 /* Macros used for loops unrolling */
41 
42 #define SHA256_SCR(i) \
43   { w[i] = SHA256_F4(w[i - 2]) + w[i - 7] + SHA256_F3(w[i - 15]) + w[i - 16]; }
44 
45 #define SHA256_EXP(a, b, c, d, e, f, g, h, j)                               \
46   {                                                                         \
47     t1 = wv[h] + SHA256_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) + sha256_k[j] + \
48          w[j];                                                              \
49     t2 = SHA256_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]);                       \
50     wv[d] += t1;                                                            \
51     wv[h] = t1 + t2;                                                        \
52   }
53 
54 static const uint32_t sha256_h0[8] = {0x6a09e667,
55                                       0xbb67ae85,
56                                       0x3c6ef372,
57                                       0xa54ff53a,
58                                       0x510e527f,
59                                       0x9b05688c,
60                                       0x1f83d9ab,
61                                       0x5be0cd19};
62 
63 static const uint32_t sha256_k[64] = {
64     0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
65     0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
66     0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
67     0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
68     0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
69     0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
70     0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
71     0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
72     0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
73     0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
74     0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
75 
76 /* SHA-256 implementation */
77 void avb_sha256_init(AvbSHA256Ctx* ctx) {
78 #ifndef UNROLL_LOOPS
79   int i;
80   for (i = 0; i < 8; i++) {
81     ctx->h[i] = sha256_h0[i];
82   }
83 #else
84   ctx->h[0] = sha256_h0[0];
85   ctx->h[1] = sha256_h0[1];
86   ctx->h[2] = sha256_h0[2];
87   ctx->h[3] = sha256_h0[3];
88   ctx->h[4] = sha256_h0[4];
89   ctx->h[5] = sha256_h0[5];
90   ctx->h[6] = sha256_h0[6];
91   ctx->h[7] = sha256_h0[7];
92 #endif /* !UNROLL_LOOPS */
93 
94   ctx->len = 0;
95   ctx->tot_len = 0;
96 }
97 
98 static void SHA256_transform(AvbSHA256Ctx* ctx,
99                              const uint8_t* message,
100                              unsigned int block_nb) {
101   uint32_t w[64];
102   uint32_t wv[8];
103   uint32_t t1, t2;
104   const unsigned char* sub_block;
105   int i;
106 
107 #ifndef UNROLL_LOOPS
108   int j;
109 #endif
110 
111   for (i = 0; i < (int)block_nb; i++) {
112     sub_block = message + (i << 6);
113 
114 #ifndef UNROLL_LOOPS
115     for (j = 0; j < 16; j++) {
116       PACK32(&sub_block[j << 2], &w[j]);
117     }
118 
119     for (j = 16; j < 64; j++) {
120       SHA256_SCR(j);
121     }
122 
123     for (j = 0; j < 8; j++) {
124       wv[j] = ctx->h[j];
125     }
126 
127     for (j = 0; j < 64; j++) {
128       t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6]) + sha256_k[j] +
129            w[j];
130       t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
131       wv[7] = wv[6];
132       wv[6] = wv[5];
133       wv[5] = wv[4];
134       wv[4] = wv[3] + t1;
135       wv[3] = wv[2];
136       wv[2] = wv[1];
137       wv[1] = wv[0];
138       wv[0] = t1 + t2;
139     }
140 
141     for (j = 0; j < 8; j++) {
142       ctx->h[j] += wv[j];
143     }
144 #else
145     PACK32(&sub_block[0], &w[0]);
146     PACK32(&sub_block[4], &w[1]);
147     PACK32(&sub_block[8], &w[2]);
148     PACK32(&sub_block[12], &w[3]);
149     PACK32(&sub_block[16], &w[4]);
150     PACK32(&sub_block[20], &w[5]);
151     PACK32(&sub_block[24], &w[6]);
152     PACK32(&sub_block[28], &w[7]);
153     PACK32(&sub_block[32], &w[8]);
154     PACK32(&sub_block[36], &w[9]);
155     PACK32(&sub_block[40], &w[10]);
156     PACK32(&sub_block[44], &w[11]);
157     PACK32(&sub_block[48], &w[12]);
158     PACK32(&sub_block[52], &w[13]);
159     PACK32(&sub_block[56], &w[14]);
160     PACK32(&sub_block[60], &w[15]);
161 
162     SHA256_SCR(16);
163     SHA256_SCR(17);
164     SHA256_SCR(18);
165     SHA256_SCR(19);
166     SHA256_SCR(20);
167     SHA256_SCR(21);
168     SHA256_SCR(22);
169     SHA256_SCR(23);
170     SHA256_SCR(24);
171     SHA256_SCR(25);
172     SHA256_SCR(26);
173     SHA256_SCR(27);
174     SHA256_SCR(28);
175     SHA256_SCR(29);
176     SHA256_SCR(30);
177     SHA256_SCR(31);
178     SHA256_SCR(32);
179     SHA256_SCR(33);
180     SHA256_SCR(34);
181     SHA256_SCR(35);
182     SHA256_SCR(36);
183     SHA256_SCR(37);
184     SHA256_SCR(38);
185     SHA256_SCR(39);
186     SHA256_SCR(40);
187     SHA256_SCR(41);
188     SHA256_SCR(42);
189     SHA256_SCR(43);
190     SHA256_SCR(44);
191     SHA256_SCR(45);
192     SHA256_SCR(46);
193     SHA256_SCR(47);
194     SHA256_SCR(48);
195     SHA256_SCR(49);
196     SHA256_SCR(50);
197     SHA256_SCR(51);
198     SHA256_SCR(52);
199     SHA256_SCR(53);
200     SHA256_SCR(54);
201     SHA256_SCR(55);
202     SHA256_SCR(56);
203     SHA256_SCR(57);
204     SHA256_SCR(58);
205     SHA256_SCR(59);
206     SHA256_SCR(60);
207     SHA256_SCR(61);
208     SHA256_SCR(62);
209     SHA256_SCR(63);
210 
211     wv[0] = ctx->h[0];
212     wv[1] = ctx->h[1];
213     wv[2] = ctx->h[2];
214     wv[3] = ctx->h[3];
215     wv[4] = ctx->h[4];
216     wv[5] = ctx->h[5];
217     wv[6] = ctx->h[6];
218     wv[7] = ctx->h[7];
219 
220     SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 0);
221     SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 1);
222     SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 2);
223     SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 3);
224     SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 4);
225     SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 5);
226     SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 6);
227     SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 7);
228     SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 8);
229     SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 9);
230     SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 10);
231     SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 11);
232     SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 12);
233     SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 13);
234     SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 14);
235     SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 15);
236     SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 16);
237     SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 17);
238     SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 18);
239     SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 19);
240     SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 20);
241     SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 21);
242     SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 22);
243     SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 23);
244     SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 24);
245     SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 25);
246     SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 26);
247     SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 27);
248     SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 28);
249     SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 29);
250     SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 30);
251     SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 31);
252     SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 32);
253     SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 33);
254     SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 34);
255     SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 35);
256     SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 36);
257     SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 37);
258     SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 38);
259     SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 39);
260     SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 40);
261     SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 41);
262     SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 42);
263     SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 43);
264     SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 44);
265     SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 45);
266     SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 46);
267     SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 47);
268     SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 48);
269     SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 49);
270     SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 50);
271     SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 51);
272     SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 52);
273     SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 53);
274     SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 54);
275     SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 55);
276     SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 56);
277     SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 57);
278     SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 58);
279     SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 59);
280     SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 60);
281     SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 61);
282     SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 62);
283     SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 63);
284 
285     ctx->h[0] += wv[0];
286     ctx->h[1] += wv[1];
287     ctx->h[2] += wv[2];
288     ctx->h[3] += wv[3];
289     ctx->h[4] += wv[4];
290     ctx->h[5] += wv[5];
291     ctx->h[6] += wv[6];
292     ctx->h[7] += wv[7];
293 #endif /* !UNROLL_LOOPS */
294   }
295 }
296 
297 void avb_sha256_update(AvbSHA256Ctx* ctx, const uint8_t* data, uint32_t len) {
298   unsigned int block_nb;
299   unsigned int new_len, rem_len, tmp_len;
300   const uint8_t* shifted_data;
301 
302   tmp_len = AVB_SHA256_BLOCK_SIZE - ctx->len;
303   rem_len = len < tmp_len ? len : tmp_len;
304 
305   avb_memcpy(&ctx->block[ctx->len], data, rem_len);
306 
307   if (ctx->len + len < AVB_SHA256_BLOCK_SIZE) {
308     ctx->len += len;
309     return;
310   }
311 
312   new_len = len - rem_len;
313   block_nb = new_len / AVB_SHA256_BLOCK_SIZE;
314 
315   shifted_data = data + rem_len;
316 
317   SHA256_transform(ctx, ctx->block, 1);
318   SHA256_transform(ctx, shifted_data, block_nb);
319 
320   rem_len = new_len % AVB_SHA256_BLOCK_SIZE;
321 
322   avb_memcpy(ctx->block, &shifted_data[block_nb << 6], rem_len);
323 
324   ctx->len = rem_len;
325   ctx->tot_len += (block_nb + 1) << 6;
326 }
327 
328 uint8_t* avb_sha256_final(AvbSHA256Ctx* ctx) {
329   unsigned int block_nb;
330   unsigned int pm_len;
331   unsigned int len_b;
332 #ifndef UNROLL_LOOPS
333   int i;
334 #endif
335 
336   block_nb =
337       (1 + ((AVB_SHA256_BLOCK_SIZE - 9) < (ctx->len % AVB_SHA256_BLOCK_SIZE)));
338 
339   len_b = (ctx->tot_len + ctx->len) << 3;
340   pm_len = block_nb << 6;
341 
342   avb_memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
343   ctx->block[ctx->len] = 0x80;
344   UNPACK32(len_b, ctx->block + pm_len - 4);
345 
346   SHA256_transform(ctx, ctx->block, block_nb);
347 
348 #ifndef UNROLL_LOOPS
349   for (i = 0; i < 8; i++) {
350     UNPACK32(ctx->h[i], &ctx->buf[i << 2]);
351   }
352 #else
353   UNPACK32(ctx->h[0], &ctx->buf[0]);
354   UNPACK32(ctx->h[1], &ctx->buf[4]);
355   UNPACK32(ctx->h[2], &ctx->buf[8]);
356   UNPACK32(ctx->h[3], &ctx->buf[12]);
357   UNPACK32(ctx->h[4], &ctx->buf[16]);
358   UNPACK32(ctx->h[5], &ctx->buf[20]);
359   UNPACK32(ctx->h[6], &ctx->buf[24]);
360   UNPACK32(ctx->h[7], &ctx->buf[28]);
361 #endif /* !UNROLL_LOOPS */
362 
363   return ctx->buf;
364 }
365