xref: /openbmc/u-boot/lib/libavb/avb_sha512.c (revision fd0bc623) 
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 
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 
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 
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 
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