Bitcoin Core  0.20.99
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 http://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 
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 
50 static 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 
132 static 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 
151 static 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. */
169 static void secp256k1_sha256_initialize_tagged(secp256k1_sha256 *hash, const unsigned char *tag, size_t taglen) {
170  unsigned char buf[32];
172  secp256k1_sha256_write(hash, tag, taglen);
173  secp256k1_sha256_finalize(hash, buf);
174 
176  secp256k1_sha256_write(hash, buf, 32);
177  secp256k1_sha256_write(hash, buf, 32);
178 }
179 
180 static 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 {
189  secp256k1_sha256_write(&sha256, key, keylen);
190  secp256k1_sha256_finalize(&sha256, rkey);
191  memset(rkey + 32, 0, 32);
192  }
193 
195  for (n = 0; n < sizeof(rkey); n++) {
196  rkey[n] ^= 0x5c;
197  }
198  secp256k1_sha256_write(&hash->outer, rkey, sizeof(rkey));
199 
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 
208 static 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 
212 static 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 
221 static void secp256k1_rfc6979_hmac_sha256_initialize(secp256k1_rfc6979_hmac_sha256 *rng, const unsigned char *key, size_t keylen) {
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 
251 static 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) {
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) {
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 
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 */
#define VERIFY_CHECK(cond)
Definition: util.h:68
const std::chrono::seconds now
unsigned char v[32]
Definition: hash.h:32
#define Round(a, b, c, d, e, f, g, h, k, w)
Definition: hash_impl.h:24
secp256k1_sha256 outer
Definition: hash.h:24
unsigned char k[32]
Definition: hash.h:33
#define sigma1(x)
Definition: hash_impl.h:22
#define sigma0(x)
Definition: hash_impl.h:21
secp256k1_sha256 inner
Definition: hash.h:24
static void secp256k1_hmac_sha256_initialize(secp256k1_hmac_sha256 *hash, const unsigned char *key, size_t keylen)
Definition: hash_impl.h:180
uint32_t s[8]
Definition: hash.h:14
static void secp256k1_sha256_write(secp256k1_sha256 *hash, const unsigned char *data, size_t len)
Definition: hash_impl.h:132
static void secp256k1_sha256_finalize(secp256k1_sha256 *hash, unsigned char *out32)
Definition: hash_impl.h:151
static void secp256k1_hmac_sha256_write(secp256k1_hmac_sha256 *hash, const unsigned char *data, size_t size)
Definition: hash_impl.h:208
static void secp256k1_rfc6979_hmac_sha256_generate(secp256k1_rfc6979_hmac_sha256 *rng, unsigned char *out, size_t outlen)
Definition: hash_impl.h:251
static void secp256k1_sha256_initialize_tagged(secp256k1_sha256 *hash, const unsigned char *tag, size_t taglen)
Definition: hash_impl.h:169
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
static void secp256k1_rfc6979_hmac_sha256_initialize(secp256k1_rfc6979_hmac_sha256 *rng, const unsigned char *key, size_t keylen)
Definition: hash_impl.h:221
uint32_t buf[16]
Definition: hash.h:15
void * memcpy(void *a, const void *b, size_t c)
Internal SHA-256 implementation.
Definition: sha256.cpp:46
static void secp256k1_hmac_sha256_finalize(secp256k1_hmac_sha256 *hash, unsigned char *out32)
Definition: hash_impl.h:212
size_t bytes
Definition: hash.h:16
static void secp256k1_rfc6979_hmac_sha256_finalize(secp256k1_rfc6979_hmac_sha256 *rng)
Definition: hash_impl.h:282
static void secp256k1_sha256_initialize(secp256k1_sha256 *hash)
Definition: hash_impl.h:37