Line data Source code
1 : // Copyright (c) 2014 The Bitcoin developers
2 : // Distributed under the MIT software license, see the accompanying
3 : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 :
5 : #include "crypto/sha256.h"
6 :
7 : #include "crypto/common.h"
8 :
9 : #include <string.h>
10 : #include <stdexcept>
11 :
12 : // Internal implementation code.
13 : namespace
14 : {
15 : /// Internal SHA-256 implementation.
16 : namespace sha256
17 : {
18 6582150000 : uint32_t inline Ch(uint32_t x, uint32_t y, uint32_t z) { return z ^ (x & (y ^ z)); }
19 6582150000 : uint32_t inline Maj(uint32_t x, uint32_t y, uint32_t z) { return (x & y) | (z & (x | y)); }
20 6582150000 : uint32_t inline Sigma0(uint32_t x) { return (x >> 2 | x << 30) ^ (x >> 13 | x << 19) ^ (x >> 22 | x << 10); }
21 6582150000 : uint32_t inline Sigma1(uint32_t x) { return (x >> 6 | x << 26) ^ (x >> 11 | x << 21) ^ (x >> 25 | x << 7); }
22 4936400000 : uint32_t inline sigma0(uint32_t x) { return (x >> 7 | x << 25) ^ (x >> 18 | x << 14) ^ (x >> 3); }
23 4936400000 : uint32_t inline sigma1(uint32_t x) { return (x >> 17 | x << 15) ^ (x >> 19 | x << 13) ^ (x >> 10); }
24 :
25 : /** One round of SHA-256. */
26 6582150000 : void inline Round(uint32_t a, uint32_t b, uint32_t c, uint32_t& d, uint32_t e, uint32_t f, uint32_t g, uint32_t& h, uint32_t k, uint32_t w)
27 : {
28 6582150000 : uint32_t t1 = h + Sigma1(e) + Ch(e, f, g) + k + w;
29 6582150000 : uint32_t t2 = Sigma0(a) + Maj(a, b, c);
30 6582150000 : d += t1;
31 6582150000 : h = t1 + t2;
32 6582150000 : }
33 :
34 : /** Initialize SHA-256 state. */
35 35129400 : void inline Initialize(uint32_t* s)
36 : {
37 35129400 : s[0] = 0x6a09e667ul;
38 35129400 : s[1] = 0xbb67ae85ul;
39 35129400 : s[2] = 0x3c6ef372ul;
40 35129400 : s[3] = 0xa54ff53aul;
41 35129400 : s[4] = 0x510e527ful;
42 35129400 : s[5] = 0x9b05688cul;
43 35129400 : s[6] = 0x1f83d9abul;
44 35129400 : s[7] = 0x5be0cd19ul;
45 : }
46 :
47 : /** Perform one SHA-256 transformation, processing a 64-byte chunk. */
48 102765600 : void Transform(uint32_t* s, const unsigned char* chunk)
49 : {
50 102765600 : 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];
51 102765600 : uint32_t w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13, w14, w15;
52 :
53 102765600 : Round(a, b, c, d, e, f, g, h, 0x428a2f98, w0 = ReadBE32(chunk + 0));
54 102771000 : Round(h, a, b, c, d, e, f, g, 0x71374491, w1 = ReadBE32(chunk + 4));
55 102773500 : Round(g, h, a, b, c, d, e, f, 0xb5c0fbcf, w2 = ReadBE32(chunk + 8));
56 102776700 : Round(f, g, h, a, b, c, d, e, 0xe9b5dba5, w3 = ReadBE32(chunk + 12));
57 102782300 : Round(e, f, g, h, a, b, c, d, 0x3956c25b, w4 = ReadBE32(chunk + 16));
58 102782000 : Round(d, e, f, g, h, a, b, c, 0x59f111f1, w5 = ReadBE32(chunk + 20));
59 102784400 : Round(c, d, e, f, g, h, a, b, 0x923f82a4, w6 = ReadBE32(chunk + 24));
60 102786500 : Round(b, c, d, e, f, g, h, a, 0xab1c5ed5, w7 = ReadBE32(chunk + 28));
61 102789300 : Round(a, b, c, d, e, f, g, h, 0xd807aa98, w8 = ReadBE32(chunk + 32));
62 102793500 : Round(h, a, b, c, d, e, f, g, 0x12835b01, w9 = ReadBE32(chunk + 36));
63 102796400 : Round(g, h, a, b, c, d, e, f, 0x243185be, w10 = ReadBE32(chunk + 40));
64 102805900 : Round(f, g, h, a, b, c, d, e, 0x550c7dc3, w11 = ReadBE32(chunk + 44));
65 102800700 : Round(e, f, g, h, a, b, c, d, 0x72be5d74, w12 = ReadBE32(chunk + 48));
66 102804200 : Round(d, e, f, g, h, a, b, c, 0x80deb1fe, w13 = ReadBE32(chunk + 52));
67 102806800 : Round(c, d, e, f, g, h, a, b, 0x9bdc06a7, w14 = ReadBE32(chunk + 56));
68 102809200 : Round(b, c, d, e, f, g, h, a, 0xc19bf174, w15 = ReadBE32(chunk + 60));
69 :
70 102810600 : Round(a, b, c, d, e, f, g, h, 0xe49b69c1, w0 += sigma1(w14) + w9 + sigma0(w1));
71 102814300 : Round(h, a, b, c, d, e, f, g, 0xefbe4786, w1 += sigma1(w15) + w10 + sigma0(w2));
72 102817400 : Round(g, h, a, b, c, d, e, f, 0x0fc19dc6, w2 += sigma1(w0) + w11 + sigma0(w3));
73 102820500 : Round(f, g, h, a, b, c, d, e, 0x240ca1cc, w3 += sigma1(w1) + w12 + sigma0(w4));
74 102815300 : Round(e, f, g, h, a, b, c, d, 0x2de92c6f, w4 += sigma1(w2) + w13 + sigma0(w5));
75 102820600 : Round(d, e, f, g, h, a, b, c, 0x4a7484aa, w5 += sigma1(w3) + w14 + sigma0(w6));
76 102824100 : Round(c, d, e, f, g, h, a, b, 0x5cb0a9dc, w6 += sigma1(w4) + w15 + sigma0(w7));
77 102827000 : Round(b, c, d, e, f, g, h, a, 0x76f988da, w7 += sigma1(w5) + w0 + sigma0(w8));
78 102829300 : Round(a, b, c, d, e, f, g, h, 0x983e5152, w8 += sigma1(w6) + w1 + sigma0(w9));
79 102834700 : Round(h, a, b, c, d, e, f, g, 0xa831c66d, w9 += sigma1(w7) + w2 + sigma0(w10));
80 102837200 : Round(g, h, a, b, c, d, e, f, 0xb00327c8, w10 += sigma1(w8) + w3 + sigma0(w11));
81 102839300 : Round(f, g, h, a, b, c, d, e, 0xbf597fc7, w11 += sigma1(w9) + w4 + sigma0(w12));
82 102833900 : Round(e, f, g, h, a, b, c, d, 0xc6e00bf3, w12 += sigma1(w10) + w5 + sigma0(w13));
83 102836400 : Round(d, e, f, g, h, a, b, c, 0xd5a79147, w13 += sigma1(w11) + w6 + sigma0(w14));
84 102839300 : Round(c, d, e, f, g, h, a, b, 0x06ca6351, w14 += sigma1(w12) + w7 + sigma0(w15));
85 102841300 : Round(b, c, d, e, f, g, h, a, 0x14292967, w15 += sigma1(w13) + w8 + sigma0(w0));
86 :
87 102843800 : Round(a, b, c, d, e, f, g, h, 0x27b70a85, w0 += sigma1(w14) + w9 + sigma0(w1));
88 102845200 : Round(h, a, b, c, d, e, f, g, 0x2e1b2138, w1 += sigma1(w15) + w10 + sigma0(w2));
89 102846900 : Round(g, h, a, b, c, d, e, f, 0x4d2c6dfc, w2 += sigma1(w0) + w11 + sigma0(w3));
90 102847800 : Round(f, g, h, a, b, c, d, e, 0x53380d13, w3 += sigma1(w1) + w12 + sigma0(w4));
91 102844900 : Round(e, f, g, h, a, b, c, d, 0x650a7354, w4 += sigma1(w2) + w13 + sigma0(w5));
92 102845900 : Round(d, e, f, g, h, a, b, c, 0x766a0abb, w5 += sigma1(w3) + w14 + sigma0(w6));
93 102847700 : Round(c, d, e, f, g, h, a, b, 0x81c2c92e, w6 += sigma1(w4) + w15 + sigma0(w7));
94 102847900 : Round(b, c, d, e, f, g, h, a, 0x92722c85, w7 += sigma1(w5) + w0 + sigma0(w8));
95 102849300 : Round(a, b, c, d, e, f, g, h, 0xa2bfe8a1, w8 += sigma1(w6) + w1 + sigma0(w9));
96 102850000 : Round(h, a, b, c, d, e, f, g, 0xa81a664b, w9 += sigma1(w7) + w2 + sigma0(w10));
97 102850700 : Round(g, h, a, b, c, d, e, f, 0xc24b8b70, w10 += sigma1(w8) + w3 + sigma0(w11));
98 102851200 : Round(f, g, h, a, b, c, d, e, 0xc76c51a3, w11 += sigma1(w9) + w4 + sigma0(w12));
99 102842900 : Round(e, f, g, h, a, b, c, d, 0xd192e819, w12 += sigma1(w10) + w5 + sigma0(w13));
100 102844600 : Round(d, e, f, g, h, a, b, c, 0xd6990624, w13 += sigma1(w11) + w6 + sigma0(w14));
101 102846300 : Round(c, d, e, f, g, h, a, b, 0xf40e3585, w14 += sigma1(w12) + w7 + sigma0(w15));
102 102848700 : Round(b, c, d, e, f, g, h, a, 0x106aa070, w15 += sigma1(w13) + w8 + sigma0(w0));
103 :
104 102850900 : Round(a, b, c, d, e, f, g, h, 0x19a4c116, w0 += sigma1(w14) + w9 + sigma0(w1));
105 102852100 : Round(h, a, b, c, d, e, f, g, 0x1e376c08, w1 += sigma1(w15) + w10 + sigma0(w2));
106 102852900 : Round(g, h, a, b, c, d, e, f, 0x2748774c, w2 += sigma1(w0) + w11 + sigma0(w3));
107 102853200 : Round(f, g, h, a, b, c, d, e, 0x34b0bcb5, w3 += sigma1(w1) + w12 + sigma0(w4));
108 102849500 : Round(e, f, g, h, a, b, c, d, 0x391c0cb3, w4 += sigma1(w2) + w13 + sigma0(w5));
109 102848000 : Round(d, e, f, g, h, a, b, c, 0x4ed8aa4a, w5 += sigma1(w3) + w14 + sigma0(w6));
110 102851600 : Round(c, d, e, f, g, h, a, b, 0x5b9cca4f, w6 += sigma1(w4) + w15 + sigma0(w7));
111 102852700 : Round(b, c, d, e, f, g, h, a, 0x682e6ff3, w7 += sigma1(w5) + w0 + sigma0(w8));
112 102853200 : Round(a, b, c, d, e, f, g, h, 0x748f82ee, w8 += sigma1(w6) + w1 + sigma0(w9));
113 102853200 : Round(h, a, b, c, d, e, f, g, 0x78a5636f, w9 += sigma1(w7) + w2 + sigma0(w10));
114 102853500 : Round(g, h, a, b, c, d, e, f, 0x84c87814, w10 += sigma1(w8) + w3 + sigma0(w11));
115 102853900 : Round(f, g, h, a, b, c, d, e, 0x8cc70208, w11 += sigma1(w9) + w4 + sigma0(w12));
116 102839600 : Round(e, f, g, h, a, b, c, d, 0x90befffa, w12 += sigma1(w10) + w5 + sigma0(w13));
117 102844000 : Round(d, e, f, g, h, a, b, c, 0xa4506ceb, w13 += sigma1(w11) + w6 + sigma0(w14));
118 102847000 : Round(c, d, e, f, g, h, a, b, 0xbef9a3f7, w14 + sigma1(w12) + w7 + sigma0(w15));
119 102850800 : Round(b, c, d, e, f, g, h, a, 0xc67178f2, w15 + sigma1(w13) + w8 + sigma0(w0));
120 :
121 102836000 : s[0] += a;
122 102836000 : s[1] += b;
123 102836000 : s[2] += c;
124 102836000 : s[3] += d;
125 102836000 : s[4] += e;
126 102836000 : s[5] += f;
127 102836000 : s[6] += g;
128 102836000 : s[7] += h;
129 102836000 : }
130 :
131 : } // namespace sha256
132 : } // namespace
133 :
134 :
135 : ////// SHA-256
136 :
137 22666120 : CSHA256::CSHA256() : bytes(0)
138 : {
139 22666120 : sha256::Initialize(s);
140 22666120 : }
141 :
142 424624000 : CSHA256& CSHA256::Write(const unsigned char* data, size_t len)
143 : {
144 424624000 : const unsigned char* end = data + len;
145 424624000 : size_t bufsize = bytes % 64;
146 424624000 : if (bufsize && bufsize + len >= 64) {
147 : // Fill the buffer, and process it.
148 83400500 : memcpy(buf + bufsize, data, 64 - bufsize);
149 83400500 : bytes += 64 - bufsize;
150 83400500 : data += 64 - bufsize;
151 83400500 : sha256::Transform(s, buf);
152 83400500 : bufsize = 0;
153 : }
154 443945000 : while (end >= data + 64) {
155 : // Process full chunks directly from the source.
156 19373690 : sha256::Transform(s, data);
157 19264030 : bytes += 64;
158 19264030 : data += 64;
159 : }
160 424571000 : if (end > data) {
161 : // Fill the buffer with what remains.
162 382381000 : memcpy(buf + bufsize, data, end - data);
163 382381000 : bytes += end - data;
164 : }
165 424571000 : return *this;
166 : }
167 :
168 35139060 : void CSHA256::Finalize(unsigned char hash[OUTPUT_SIZE])
169 : {
170 35139060 : static const unsigned char pad[64] = {0x80};
171 35139060 : unsigned char sizedesc[8];
172 35139060 : WriteBE64(sizedesc, bytes << 3);
173 35139060 : Write(pad, 1 + ((119 - (bytes % 64)) % 64));
174 35130160 : Write(sizedesc, 8);
175 35140280 : FinalizeNoPadding(hash, false);
176 35140060 : }
177 :
178 35140340 : void CSHA256::FinalizeNoPadding(unsigned char hash[OUTPUT_SIZE], bool enforce_compression)
179 : {
180 35140340 : if (enforce_compression && bytes != 64) {
181 1 : throw std::length_error("SHA256Compress should be invoked with a 512-bit block");
182 : }
183 :
184 35140340 : WriteBE32(hash, s[0]);
185 35140340 : WriteBE32(hash + 4, s[1]);
186 35140340 : WriteBE32(hash + 8, s[2]);
187 35140340 : WriteBE32(hash + 12, s[3]);
188 35140340 : WriteBE32(hash + 16, s[4]);
189 35140340 : WriteBE32(hash + 20, s[5]);
190 35140340 : WriteBE32(hash + 24, s[6]);
191 35140340 : WriteBE32(hash + 28, s[7]);
192 35140340 : }
193 :
194 12463200 : CSHA256& CSHA256::Reset()
195 : {
196 12463200 : bytes = 0;
197 12463200 : sha256::Initialize(s);
198 12463200 : return *this;
199 : }
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