Bitcoin ABC 0.30.5
P2P Digital Currency
hash_impl.h
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1/***********************************************************************
2 * Copyright (c) 2014 Pieter Wuille *
3 * Distributed under the MIT software license, see the accompanying *
4 * file COPYING or https://www.opensource.org/licenses/mit-license.php.*
5 ***********************************************************************/
6
7#ifndef SECP256K1_HASH_IMPL_H
8#define SECP256K1_HASH_IMPL_H
9
10#include "hash.h"
11#include "util.h"
12
13#include <stdlib.h>
14#include <stdint.h>
15#include <string.h>
16
17#define Ch(x,y,z) ((z) ^ ((x) & ((y) ^ (z))))
18#define Maj(x,y,z) (((x) & (y)) | ((z) & ((x) | (y))))
19#define Sigma0(x) (((x) >> 2 | (x) << 30) ^ ((x) >> 13 | (x) << 19) ^ ((x) >> 22 | (x) << 10))
20#define Sigma1(x) (((x) >> 6 | (x) << 26) ^ ((x) >> 11 | (x) << 21) ^ ((x) >> 25 | (x) << 7))
21#define sigma0(x) (((x) >> 7 | (x) << 25) ^ ((x) >> 18 | (x) << 14) ^ ((x) >> 3))
22#define sigma1(x) (((x) >> 17 | (x) << 15) ^ ((x) >> 19 | (x) << 13) ^ ((x) >> 10))
23
24#define Round(a,b,c,d,e,f,g,h,k,w) do { \
25 uint32_t t1 = (h) + Sigma1(e) + Ch((e), (f), (g)) + (k) + (w); \
26 uint32_t t2 = Sigma0(a) + Maj((a), (b), (c)); \
27 (d) += t1; \
28 (h) = t1 + t2; \
29} while(0)
30
31#if defined(SECP256K1_BIG_ENDIAN)
32#define BE32(x) (x)
33#elif defined(SECP256K1_LITTLE_ENDIAN)
34#define BE32(p) ((((p) & 0xFF) << 24) | (((p) & 0xFF00) << 8) | (((p) & 0xFF0000) >> 8) | (((p) & 0xFF000000) >> 24))
35#endif
36
37static void secp256k1_sha256_initialize(secp256k1_sha256 *hash) {
38 hash->s[0] = 0x6a09e667ul;
39 hash->s[1] = 0xbb67ae85ul;
40 hash->s[2] = 0x3c6ef372ul;
41 hash->s[3] = 0xa54ff53aul;
42 hash->s[4] = 0x510e527ful;
43 hash->s[5] = 0x9b05688cul;
44 hash->s[6] = 0x1f83d9abul;
45 hash->s[7] = 0x5be0cd19ul;
46 hash->bytes = 0;
47}
48
50static void secp256k1_sha256_transform(uint32_t* s, const uint32_t* chunk) {
51 uint32_t a = s[0], b = s[1], c = s[2], d = s[3], e = s[4], f = s[5], g = s[6], h = s[7];
52 uint32_t w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13, w14, w15;
53
54 Round(a, b, c, d, e, f, g, h, 0x428a2f98, w0 = BE32(chunk[0]));
55 Round(h, a, b, c, d, e, f, g, 0x71374491, w1 = BE32(chunk[1]));
56 Round(g, h, a, b, c, d, e, f, 0xb5c0fbcf, w2 = BE32(chunk[2]));
57 Round(f, g, h, a, b, c, d, e, 0xe9b5dba5, w3 = BE32(chunk[3]));
58 Round(e, f, g, h, a, b, c, d, 0x3956c25b, w4 = BE32(chunk[4]));
59 Round(d, e, f, g, h, a, b, c, 0x59f111f1, w5 = BE32(chunk[5]));
60 Round(c, d, e, f, g, h, a, b, 0x923f82a4, w6 = BE32(chunk[6]));
61 Round(b, c, d, e, f, g, h, a, 0xab1c5ed5, w7 = BE32(chunk[7]));
62 Round(a, b, c, d, e, f, g, h, 0xd807aa98, w8 = BE32(chunk[8]));
63 Round(h, a, b, c, d, e, f, g, 0x12835b01, w9 = BE32(chunk[9]));
64 Round(g, h, a, b, c, d, e, f, 0x243185be, w10 = BE32(chunk[10]));
65 Round(f, g, h, a, b, c, d, e, 0x550c7dc3, w11 = BE32(chunk[11]));
66 Round(e, f, g, h, a, b, c, d, 0x72be5d74, w12 = BE32(chunk[12]));
67 Round(d, e, f, g, h, a, b, c, 0x80deb1fe, w13 = BE32(chunk[13]));
68 Round(c, d, e, f, g, h, a, b, 0x9bdc06a7, w14 = BE32(chunk[14]));
69 Round(b, c, d, e, f, g, h, a, 0xc19bf174, w15 = BE32(chunk[15]));
70
71 Round(a, b, c, d, e, f, g, h, 0xe49b69c1, w0 += sigma1(w14) + w9 + sigma0(w1));
72 Round(h, a, b, c, d, e, f, g, 0xefbe4786, w1 += sigma1(w15) + w10 + sigma0(w2));
73 Round(g, h, a, b, c, d, e, f, 0x0fc19dc6, w2 += sigma1(w0) + w11 + sigma0(w3));
74 Round(f, g, h, a, b, c, d, e, 0x240ca1cc, w3 += sigma1(w1) + w12 + sigma0(w4));
75 Round(e, f, g, h, a, b, c, d, 0x2de92c6f, w4 += sigma1(w2) + w13 + sigma0(w5));
76 Round(d, e, f, g, h, a, b, c, 0x4a7484aa, w5 += sigma1(w3) + w14 + sigma0(w6));
77 Round(c, d, e, f, g, h, a, b, 0x5cb0a9dc, w6 += sigma1(w4) + w15 + sigma0(w7));
78 Round(b, c, d, e, f, g, h, a, 0x76f988da, w7 += sigma1(w5) + w0 + sigma0(w8));
79 Round(a, b, c, d, e, f, g, h, 0x983e5152, w8 += sigma1(w6) + w1 + sigma0(w9));
80 Round(h, a, b, c, d, e, f, g, 0xa831c66d, w9 += sigma1(w7) + w2 + sigma0(w10));
81 Round(g, h, a, b, c, d, e, f, 0xb00327c8, w10 += sigma1(w8) + w3 + sigma0(w11));
82 Round(f, g, h, a, b, c, d, e, 0xbf597fc7, w11 += sigma1(w9) + w4 + sigma0(w12));
83 Round(e, f, g, h, a, b, c, d, 0xc6e00bf3, w12 += sigma1(w10) + w5 + sigma0(w13));
84 Round(d, e, f, g, h, a, b, c, 0xd5a79147, w13 += sigma1(w11) + w6 + sigma0(w14));
85 Round(c, d, e, f, g, h, a, b, 0x06ca6351, w14 += sigma1(w12) + w7 + sigma0(w15));
86 Round(b, c, d, e, f, g, h, a, 0x14292967, w15 += sigma1(w13) + w8 + sigma0(w0));
87
88 Round(a, b, c, d, e, f, g, h, 0x27b70a85, w0 += sigma1(w14) + w9 + sigma0(w1));
89 Round(h, a, b, c, d, e, f, g, 0x2e1b2138, w1 += sigma1(w15) + w10 + sigma0(w2));
90 Round(g, h, a, b, c, d, e, f, 0x4d2c6dfc, w2 += sigma1(w0) + w11 + sigma0(w3));
91 Round(f, g, h, a, b, c, d, e, 0x53380d13, w3 += sigma1(w1) + w12 + sigma0(w4));
92 Round(e, f, g, h, a, b, c, d, 0x650a7354, w4 += sigma1(w2) + w13 + sigma0(w5));
93 Round(d, e, f, g, h, a, b, c, 0x766a0abb, w5 += sigma1(w3) + w14 + sigma0(w6));
94 Round(c, d, e, f, g, h, a, b, 0x81c2c92e, w6 += sigma1(w4) + w15 + sigma0(w7));
95 Round(b, c, d, e, f, g, h, a, 0x92722c85, w7 += sigma1(w5) + w0 + sigma0(w8));
96 Round(a, b, c, d, e, f, g, h, 0xa2bfe8a1, w8 += sigma1(w6) + w1 + sigma0(w9));
97 Round(h, a, b, c, d, e, f, g, 0xa81a664b, w9 += sigma1(w7) + w2 + sigma0(w10));
98 Round(g, h, a, b, c, d, e, f, 0xc24b8b70, w10 += sigma1(w8) + w3 + sigma0(w11));
99 Round(f, g, h, a, b, c, d, e, 0xc76c51a3, w11 += sigma1(w9) + w4 + sigma0(w12));
100 Round(e, f, g, h, a, b, c, d, 0xd192e819, w12 += sigma1(w10) + w5 + sigma0(w13));
101 Round(d, e, f, g, h, a, b, c, 0xd6990624, w13 += sigma1(w11) + w6 + sigma0(w14));
102 Round(c, d, e, f, g, h, a, b, 0xf40e3585, w14 += sigma1(w12) + w7 + sigma0(w15));
103 Round(b, c, d, e, f, g, h, a, 0x106aa070, w15 += sigma1(w13) + w8 + sigma0(w0));
104
105 Round(a, b, c, d, e, f, g, h, 0x19a4c116, w0 += sigma1(w14) + w9 + sigma0(w1));
106 Round(h, a, b, c, d, e, f, g, 0x1e376c08, w1 += sigma1(w15) + w10 + sigma0(w2));
107 Round(g, h, a, b, c, d, e, f, 0x2748774c, w2 += sigma1(w0) + w11 + sigma0(w3));
108 Round(f, g, h, a, b, c, d, e, 0x34b0bcb5, w3 += sigma1(w1) + w12 + sigma0(w4));
109 Round(e, f, g, h, a, b, c, d, 0x391c0cb3, w4 += sigma1(w2) + w13 + sigma0(w5));
110 Round(d, e, f, g, h, a, b, c, 0x4ed8aa4a, w5 += sigma1(w3) + w14 + sigma0(w6));
111 Round(c, d, e, f, g, h, a, b, 0x5b9cca4f, w6 += sigma1(w4) + w15 + sigma0(w7));
112 Round(b, c, d, e, f, g, h, a, 0x682e6ff3, w7 += sigma1(w5) + w0 + sigma0(w8));
113 Round(a, b, c, d, e, f, g, h, 0x748f82ee, w8 += sigma1(w6) + w1 + sigma0(w9));
114 Round(h, a, b, c, d, e, f, g, 0x78a5636f, w9 += sigma1(w7) + w2 + sigma0(w10));
115 Round(g, h, a, b, c, d, e, f, 0x84c87814, w10 += sigma1(w8) + w3 + sigma0(w11));
116 Round(f, g, h, a, b, c, d, e, 0x8cc70208, w11 += sigma1(w9) + w4 + sigma0(w12));
117 Round(e, f, g, h, a, b, c, d, 0x90befffa, w12 += sigma1(w10) + w5 + sigma0(w13));
118 Round(d, e, f, g, h, a, b, c, 0xa4506ceb, w13 += sigma1(w11) + w6 + sigma0(w14));
119 Round(c, d, e, f, g, h, a, b, 0xbef9a3f7, w14 + sigma1(w12) + w7 + sigma0(w15));
120 Round(b, c, d, e, f, g, h, a, 0xc67178f2, w15 + sigma1(w13) + w8 + sigma0(w0));
121
122 s[0] += a;
123 s[1] += b;
124 s[2] += c;
125 s[3] += d;
126 s[4] += e;
127 s[5] += f;
128 s[6] += g;
129 s[7] += h;
130}
131
132static void secp256k1_sha256_write(secp256k1_sha256 *hash, const unsigned char *data, size_t len) {
133 size_t bufsize = hash->bytes & 0x3F;
134 hash->bytes += len;
135 VERIFY_CHECK(hash->bytes >= len);
136 while (len >= 64 - bufsize) {
137 /* Fill the buffer, and process it. */
138 size_t chunk_len = 64 - bufsize;
139 memcpy(((unsigned char*)hash->buf) + bufsize, data, chunk_len);
140 data += chunk_len;
141 len -= chunk_len;
142 secp256k1_sha256_transform(hash->s, hash->buf);
143 bufsize = 0;
144 }
145 if (len) {
146 /* Fill the buffer with what remains. */
147 memcpy(((unsigned char*)hash->buf) + bufsize, data, len);
148 }
149}
150
151static void secp256k1_sha256_finalize(secp256k1_sha256 *hash, unsigned char *out32) {
152 static const unsigned char pad[64] = {0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
153 uint32_t sizedesc[2];
154 uint32_t out[8];
155 int i = 0;
156 sizedesc[0] = BE32(hash->bytes >> 29);
157 sizedesc[1] = BE32(hash->bytes << 3);
158 secp256k1_sha256_write(hash, pad, 1 + ((119 - (hash->bytes % 64)) % 64));
159 secp256k1_sha256_write(hash, (const unsigned char*)sizedesc, 8);
160 for (i = 0; i < 8; i++) {
161 out[i] = BE32(hash->s[i]);
162 hash->s[i] = 0;
163 }
164 memcpy(out32, (const unsigned char*)out, 32);
165}
166
167/* Initializes a sha256 struct and writes the 64 byte string
168 * SHA256(tag)||SHA256(tag) into it. */
169static void secp256k1_sha256_initialize_tagged(secp256k1_sha256 *hash, const unsigned char *tag, size_t taglen) {
170 unsigned char buf[32];
171 secp256k1_sha256_initialize(hash);
172 secp256k1_sha256_write(hash, tag, taglen);
173 secp256k1_sha256_finalize(hash, buf);
174
175 secp256k1_sha256_initialize(hash);
176 secp256k1_sha256_write(hash, buf, 32);
177 secp256k1_sha256_write(hash, buf, 32);
178}
179
180static void secp256k1_hmac_sha256_initialize(secp256k1_hmac_sha256 *hash, const unsigned char *key, size_t keylen) {
181 size_t n;
182 unsigned char rkey[64];
183 if (keylen <= sizeof(rkey)) {
184 memcpy(rkey, key, keylen);
185 memset(rkey + keylen, 0, sizeof(rkey) - keylen);
186 } else {
187 secp256k1_sha256 sha256;
188 secp256k1_sha256_initialize(&sha256);
189 secp256k1_sha256_write(&sha256, key, keylen);
190 secp256k1_sha256_finalize(&sha256, rkey);
191 memset(rkey + 32, 0, 32);
192 }
193
194 secp256k1_sha256_initialize(&hash->outer);
195 for (n = 0; n < sizeof(rkey); n++) {
196 rkey[n] ^= 0x5c;
197 }
198 secp256k1_sha256_write(&hash->outer, rkey, sizeof(rkey));
199
200 secp256k1_sha256_initialize(&hash->inner);
201 for (n = 0; n < sizeof(rkey); n++) {
202 rkey[n] ^= 0x5c ^ 0x36;
203 }
204 secp256k1_sha256_write(&hash->inner, rkey, sizeof(rkey));
205 memset(rkey, 0, sizeof(rkey));
206}
207
208static void secp256k1_hmac_sha256_write(secp256k1_hmac_sha256 *hash, const unsigned char *data, size_t size) {
209 secp256k1_sha256_write(&hash->inner, data, size);
210}
211
212static void secp256k1_hmac_sha256_finalize(secp256k1_hmac_sha256 *hash, unsigned char *out32) {
213 unsigned char temp[32];
214 secp256k1_sha256_finalize(&hash->inner, temp);
215 secp256k1_sha256_write(&hash->outer, temp, 32);
216 memset(temp, 0, 32);
217 secp256k1_sha256_finalize(&hash->outer, out32);
218}
219
220
221static void secp256k1_rfc6979_hmac_sha256_initialize(secp256k1_rfc6979_hmac_sha256 *rng, const unsigned char *key, size_t keylen) {
222 secp256k1_hmac_sha256 hmac;
223 static const unsigned char zero[1] = {0x00};
224 static const unsigned char one[1] = {0x01};
225
226 memset(rng->v, 0x01, 32); /* RFC6979 3.2.b. */
227 memset(rng->k, 0x00, 32); /* RFC6979 3.2.c. */
228
229 /* RFC6979 3.2.d. */
230 secp256k1_hmac_sha256_initialize(&hmac, rng->k, 32);
231 secp256k1_hmac_sha256_write(&hmac, rng->v, 32);
232 secp256k1_hmac_sha256_write(&hmac, zero, 1);
233 secp256k1_hmac_sha256_write(&hmac, key, keylen);
234 secp256k1_hmac_sha256_finalize(&hmac, rng->k);
235 secp256k1_hmac_sha256_initialize(&hmac, rng->k, 32);
236 secp256k1_hmac_sha256_write(&hmac, rng->v, 32);
237 secp256k1_hmac_sha256_finalize(&hmac, rng->v);
238
239 /* RFC6979 3.2.f. */
240 secp256k1_hmac_sha256_initialize(&hmac, rng->k, 32);
241 secp256k1_hmac_sha256_write(&hmac, rng->v, 32);
242 secp256k1_hmac_sha256_write(&hmac, one, 1);
243 secp256k1_hmac_sha256_write(&hmac, key, keylen);
244 secp256k1_hmac_sha256_finalize(&hmac, rng->k);
245 secp256k1_hmac_sha256_initialize(&hmac, rng->k, 32);
246 secp256k1_hmac_sha256_write(&hmac, rng->v, 32);
247 secp256k1_hmac_sha256_finalize(&hmac, rng->v);
248 rng->retry = 0;
249}
250
251static void secp256k1_rfc6979_hmac_sha256_generate(secp256k1_rfc6979_hmac_sha256 *rng, unsigned char *out, size_t outlen) {
252 /* RFC6979 3.2.h. */
253 static const unsigned char zero[1] = {0x00};
254 if (rng->retry) {
255 secp256k1_hmac_sha256 hmac;
256 secp256k1_hmac_sha256_initialize(&hmac, rng->k, 32);
257 secp256k1_hmac_sha256_write(&hmac, rng->v, 32);
258 secp256k1_hmac_sha256_write(&hmac, zero, 1);
259 secp256k1_hmac_sha256_finalize(&hmac, rng->k);
260 secp256k1_hmac_sha256_initialize(&hmac, rng->k, 32);
261 secp256k1_hmac_sha256_write(&hmac, rng->v, 32);
262 secp256k1_hmac_sha256_finalize(&hmac, rng->v);
263 }
264
265 while (outlen > 0) {
266 secp256k1_hmac_sha256 hmac;
267 int now = outlen;
268 secp256k1_hmac_sha256_initialize(&hmac, rng->k, 32);
269 secp256k1_hmac_sha256_write(&hmac, rng->v, 32);
270 secp256k1_hmac_sha256_finalize(&hmac, rng->v);
271 if (now > 32) {
272 now = 32;
273 }
274 memcpy(out, rng->v, now);
275 out += now;
276 outlen -= now;
277 }
278
279 rng->retry = 1;
280}
281
282static void secp256k1_rfc6979_hmac_sha256_finalize(secp256k1_rfc6979_hmac_sha256 *rng) {
283 memset(rng->k, 0, 32);
284 memset(rng->v, 0, 32);
285 rng->retry = 0;
286}
287
288#undef BE32
289#undef Round
290#undef sigma1
291#undef sigma0
292#undef Sigma1
293#undef Sigma0
294#undef Maj
295#undef Ch
296
297#endif /* SECP256K1_HASH_IMPL_H */
sigma1
#define sigma1(x)
Definition: hash_impl.h:22
secp256k1_sha256_initialize
static void secp256k1_sha256_initialize(secp256k1_sha256 *hash)
Definition: hash_impl.h:37
secp256k1_rfc6979_hmac_sha256_generate
static void secp256k1_rfc6979_hmac_sha256_generate(secp256k1_rfc6979_hmac_sha256 *rng, unsigned char *out, size_t outlen)
Definition: hash_impl.h:251
secp256k1_hmac_sha256_finalize
static void secp256k1_hmac_sha256_finalize(secp256k1_hmac_sha256 *hash, unsigned char *out32)
Definition: hash_impl.h:212
Round
#define Round(a, b, c, d, e, f, g, h, k, w)
Definition: hash_impl.h:24
sigma0
#define sigma0(x)
Definition: hash_impl.h:21
secp256k1_sha256_finalize
static void secp256k1_sha256_finalize(secp256k1_sha256 *hash, unsigned char *out32)
Definition: hash_impl.h:151
secp256k1_rfc6979_hmac_sha256_initialize
static void secp256k1_rfc6979_hmac_sha256_initialize(secp256k1_rfc6979_hmac_sha256 *rng, const unsigned char *key, size_t keylen)
Definition: hash_impl.h:221
secp256k1_rfc6979_hmac_sha256_finalize
static void secp256k1_rfc6979_hmac_sha256_finalize(secp256k1_rfc6979_hmac_sha256 *rng)
Definition: hash_impl.h:282
secp256k1_sha256_write
static void secp256k1_sha256_write(secp256k1_sha256 *hash, const unsigned char *data, size_t len)
Definition: hash_impl.h:132
secp256k1_hmac_sha256_write
static void secp256k1_hmac_sha256_write(secp256k1_hmac_sha256 *hash, const unsigned char *data, size_t size)
Definition: hash_impl.h:208
secp256k1_sha256_transform
static void secp256k1_sha256_transform(uint32_t *s, const uint32_t *chunk)
Perform one SHA-256 transformation, processing 16 big endian 32-bit words.
Definition: hash_impl.h:50
secp256k1_sha256_initialize_tagged
static void secp256k1_sha256_initialize_tagged(secp256k1_sha256 *hash, const unsigned char *tag, size_t taglen)
Definition: hash_impl.h:169
secp256k1_hmac_sha256_initialize
static void secp256k1_hmac_sha256_initialize(secp256k1_hmac_sha256 *hash, const unsigned char *key, size_t keylen)
Definition: hash_impl.h:180
sha256
Internal SHA-256 implementation.
Definition: sha256.cpp:40
VERIFY_CHECK
#define VERIFY_CHECK(cond)
Definition: util.h:68
secp256k1_hmac_sha256
Definition: hash.h:23
secp256k1_hmac_sha256::outer
secp256k1_sha256 outer
Definition: hash.h:24
secp256k1_hmac_sha256::inner
secp256k1_sha256 inner
Definition: hash.h:24
secp256k1_rfc6979_hmac_sha256
Definition: hash.h:31
secp256k1_rfc6979_hmac_sha256::retry
int retry
Definition: hash.h:34
secp256k1_rfc6979_hmac_sha256::k
unsigned char k[32]
Definition: hash.h:33
secp256k1_rfc6979_hmac_sha256::v
unsigned char v[32]
Definition: hash.h:32
secp256k1_sha256
Definition: hash.h:13
secp256k1_sha256::buf
uint32_t buf[16]
Definition: hash.h:15
secp256k1_sha256::bytes
size_t bytes
Definition: hash.h:16
secp256k1_sha256::s
uint32_t s[8]
Definition: hash.h:14
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