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 3890985000 : uint32_t inline Ch(uint32_t x, uint32_t y, uint32_t z) { return z ^ (x & (y ^ z)); }
19 3890985000 : uint32_t inline Maj(uint32_t x, uint32_t y, uint32_t z) { return (x & y) | (z & (x | y)); }
20 3890985000 : uint32_t inline Sigma0(uint32_t x) { return (x >> 2 | x << 30) ^ (x >> 13 | x << 19) ^ (x >> 22 | x << 10); }
21 3890985000 : uint32_t inline Sigma1(uint32_t x) { return (x >> 6 | x << 26) ^ (x >> 11 | x << 21) ^ (x >> 25 | x << 7); }
22 2918029000 : uint32_t inline sigma0(uint32_t x) { return (x >> 7 | x << 25) ^ (x >> 18 | x << 14) ^ (x >> 3); }
23 2918029000 : 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 3890985000 : 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 3890985000 : uint32_t t1 = h + Sigma1(e) + Ch(e, f, g) + k + w;
29 3890985000 : uint32_t t2 = Sigma0(a) + Maj(a, b, c);
30 3890985000 : d += t1;
31 3890985000 : h = t1 + t2;
32 3890985000 : }
33 :
34 : /** Initialize SHA-256 state. */
35 10908260 : void inline Initialize(uint32_t* s)
36 : {
37 10908260 : s[0] = 0x6a09e667ul;
38 10908260 : s[1] = 0xbb67ae85ul;
39 10908260 : s[2] = 0x3c6ef372ul;
40 10908260 : s[3] = 0xa54ff53aul;
41 10908260 : s[4] = 0x510e527ful;
42 10908260 : s[5] = 0x9b05688cul;
43 10908260 : s[6] = 0x1f83d9abul;
44 10908260 : s[7] = 0x5be0cd19ul;
45 : }
46 :
47 : /** Perform one SHA-256 transformation, processing a 64-byte chunk. */
48 60778200 : void Transform(uint32_t* s, const unsigned char* chunk)
49 : {
50 60778200 : 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 60778200 : uint32_t w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13, w14, w15;
52 :
53 60778200 : Round(a, b, c, d, e, f, g, h, 0x428a2f98, w0 = ReadBE32(chunk + 0));
54 60778900 : Round(h, a, b, c, d, e, f, g, 0x71374491, w1 = ReadBE32(chunk + 4));
55 60779400 : Round(g, h, a, b, c, d, e, f, 0xb5c0fbcf, w2 = ReadBE32(chunk + 8));
56 60780400 : Round(f, g, h, a, b, c, d, e, 0xe9b5dba5, w3 = ReadBE32(chunk + 12));
57 60774500 : Round(e, f, g, h, a, b, c, d, 0x3956c25b, w4 = ReadBE32(chunk + 16));
58 60775600 : Round(d, e, f, g, h, a, b, c, 0x59f111f1, w5 = ReadBE32(chunk + 20));
59 60776500 : Round(c, d, e, f, g, h, a, b, 0x923f82a4, w6 = ReadBE32(chunk + 24));
60 60777500 : Round(b, c, d, e, f, g, h, a, 0xab1c5ed5, w7 = ReadBE32(chunk + 28));
61 60778100 : Round(a, b, c, d, e, f, g, h, 0xd807aa98, w8 = ReadBE32(chunk + 32));
62 60779700 : Round(h, a, b, c, d, e, f, g, 0x12835b01, w9 = ReadBE32(chunk + 36));
63 60781200 : Round(g, h, a, b, c, d, e, f, 0x243185be, w10 = ReadBE32(chunk + 40));
64 60781500 : Round(f, g, h, a, b, c, d, e, 0x550c7dc3, w11 = ReadBE32(chunk + 44));
65 60780900 : Round(e, f, g, h, a, b, c, d, 0x72be5d74, w12 = ReadBE32(chunk + 48));
66 60781200 : Round(d, e, f, g, h, a, b, c, 0x80deb1fe, w13 = ReadBE32(chunk + 52));
67 60781500 : Round(c, d, e, f, g, h, a, b, 0x9bdc06a7, w14 = ReadBE32(chunk + 56));
68 60781700 : Round(b, c, d, e, f, g, h, a, 0xc19bf174, w15 = ReadBE32(chunk + 60));
69 :
70 60781900 : Round(a, b, c, d, e, f, g, h, 0xe49b69c1, w0 += sigma1(w14) + w9 + sigma0(w1));
71 60782200 : Round(h, a, b, c, d, e, f, g, 0xefbe4786, w1 += sigma1(w15) + w10 + sigma0(w2));
72 60782200 : Round(g, h, a, b, c, d, e, f, 0x0fc19dc6, w2 += sigma1(w0) + w11 + sigma0(w3));
73 60782700 : Round(f, g, h, a, b, c, d, e, 0x240ca1cc, w3 += sigma1(w1) + w12 + sigma0(w4));
74 60786400 : Round(e, f, g, h, a, b, c, d, 0x2de92c6f, w4 += sigma1(w2) + w13 + sigma0(w5));
75 60786900 : Round(d, e, f, g, h, a, b, c, 0x4a7484aa, w5 += sigma1(w3) + w14 + sigma0(w6));
76 60787200 : Round(c, d, e, f, g, h, a, b, 0x5cb0a9dc, w6 += sigma1(w4) + w15 + sigma0(w7));
77 60787300 : Round(b, c, d, e, f, g, h, a, 0x76f988da, w7 += sigma1(w5) + w0 + sigma0(w8));
78 60787700 : Round(a, b, c, d, e, f, g, h, 0x983e5152, w8 += sigma1(w6) + w1 + sigma0(w9));
79 60787400 : Round(h, a, b, c, d, e, f, g, 0xa831c66d, w9 += sigma1(w7) + w2 + sigma0(w10));
80 60787800 : Round(g, h, a, b, c, d, e, f, 0xb00327c8, w10 += sigma1(w8) + w3 + sigma0(w11));
81 60784700 : Round(f, g, h, a, b, c, d, e, 0xbf597fc7, w11 += sigma1(w9) + w4 + sigma0(w12));
82 60786900 : Round(e, f, g, h, a, b, c, d, 0xc6e00bf3, w12 += sigma1(w10) + w5 + sigma0(w13));
83 60790500 : Round(d, e, f, g, h, a, b, c, 0xd5a79147, w13 += sigma1(w11) + w6 + sigma0(w14));
84 60790800 : Round(c, d, e, f, g, h, a, b, 0x06ca6351, w14 += sigma1(w12) + w7 + sigma0(w15));
85 60790900 : Round(b, c, d, e, f, g, h, a, 0x14292967, w15 += sigma1(w13) + w8 + sigma0(w0));
86 :
87 60791000 : Round(a, b, c, d, e, f, g, h, 0x27b70a85, w0 += sigma1(w14) + w9 + sigma0(w1));
88 60790900 : Round(h, a, b, c, d, e, f, g, 0x2e1b2138, w1 += sigma1(w15) + w10 + sigma0(w2));
89 60791400 : Round(g, h, a, b, c, d, e, f, 0x4d2c6dfc, w2 += sigma1(w0) + w11 + sigma0(w3));
90 60791100 : Round(f, g, h, a, b, c, d, e, 0x53380d13, w3 += sigma1(w1) + w12 + sigma0(w4));
91 60792900 : Round(e, f, g, h, a, b, c, d, 0x650a7354, w4 += sigma1(w2) + w13 + sigma0(w5));
92 60793900 : Round(d, e, f, g, h, a, b, c, 0x766a0abb, w5 += sigma1(w3) + w14 + sigma0(w6));
93 60794000 : Round(c, d, e, f, g, h, a, b, 0x81c2c92e, w6 += sigma1(w4) + w15 + sigma0(w7));
94 60794100 : Round(b, c, d, e, f, g, h, a, 0x92722c85, w7 += sigma1(w5) + w0 + sigma0(w8));
95 60794500 : Round(a, b, c, d, e, f, g, h, 0xa2bfe8a1, w8 += sigma1(w6) + w1 + sigma0(w9));
96 60794500 : Round(h, a, b, c, d, e, f, g, 0xa81a664b, w9 += sigma1(w7) + w2 + sigma0(w10));
97 60794900 : Round(g, h, a, b, c, d, e, f, 0xc24b8b70, w10 += sigma1(w8) + w3 + sigma0(w11));
98 60793800 : Round(f, g, h, a, b, c, d, e, 0xc76c51a3, w11 += sigma1(w9) + w4 + sigma0(w12));
99 60792700 : Round(e, f, g, h, a, b, c, d, 0xd192e819, w12 += sigma1(w10) + w5 + sigma0(w13));
100 60795000 : Round(d, e, f, g, h, a, b, c, 0xd6990624, w13 += sigma1(w11) + w6 + sigma0(w14));
101 60795200 : Round(c, d, e, f, g, h, a, b, 0xf40e3585, w14 += sigma1(w12) + w7 + sigma0(w15));
102 60795200 : Round(b, c, d, e, f, g, h, a, 0x106aa070, w15 += sigma1(w13) + w8 + sigma0(w0));
103 :
104 60795200 : Round(a, b, c, d, e, f, g, h, 0x19a4c116, w0 += sigma1(w14) + w9 + sigma0(w1));
105 60795300 : Round(h, a, b, c, d, e, f, g, 0x1e376c08, w1 += sigma1(w15) + w10 + sigma0(w2));
106 60795800 : Round(g, h, a, b, c, d, e, f, 0x2748774c, w2 += sigma1(w0) + w11 + sigma0(w3));
107 60794900 : Round(f, g, h, a, b, c, d, e, 0x34b0bcb5, w3 += sigma1(w1) + w12 + sigma0(w4));
108 60796600 : Round(e, f, g, h, a, b, c, d, 0x391c0cb3, w4 += sigma1(w2) + w13 + sigma0(w5));
109 60796800 : Round(d, e, f, g, h, a, b, c, 0x4ed8aa4a, w5 += sigma1(w3) + w14 + sigma0(w6));
110 60796800 : Round(c, d, e, f, g, h, a, b, 0x5b9cca4f, w6 += sigma1(w4) + w15 + sigma0(w7));
111 60797100 : Round(b, c, d, e, f, g, h, a, 0x682e6ff3, w7 += sigma1(w5) + w0 + sigma0(w8));
112 60797200 : Round(a, b, c, d, e, f, g, h, 0x748f82ee, w8 += sigma1(w6) + w1 + sigma0(w9));
113 60797200 : Round(h, a, b, c, d, e, f, g, 0x78a5636f, w9 += sigma1(w7) + w2 + sigma0(w10));
114 60797800 : Round(g, h, a, b, c, d, e, f, 0x84c87814, w10 += sigma1(w8) + w3 + sigma0(w11));
115 60797000 : Round(f, g, h, a, b, c, d, e, 0x8cc70208, w11 += sigma1(w9) + w4 + sigma0(w12));
116 60796600 : Round(e, f, g, h, a, b, c, d, 0x90befffa, w12 += sigma1(w10) + w5 + sigma0(w13));
117 60797500 : Round(d, e, f, g, h, a, b, c, 0xa4506ceb, w13 += sigma1(w11) + w6 + sigma0(w14));
118 60797800 : Round(c, d, e, f, g, h, a, b, 0xbef9a3f7, w14 + sigma1(w12) + w7 + sigma0(w15));
119 60797800 : Round(b, c, d, e, f, g, h, a, 0xc67178f2, w15 + sigma1(w13) + w8 + sigma0(w0));
120 :
121 60796100 : s[0] += a;
122 60796100 : s[1] += b;
123 60796100 : s[2] += c;
124 60796100 : s[3] += d;
125 60796100 : s[4] += e;
126 60796100 : s[5] += f;
127 60796100 : s[6] += g;
128 60796100 : s[7] += h;
129 60796100 : }
130 :
131 : } // namespace sha256
132 : } // namespace
133 :
134 :
135 : ////// SHA-256
136 :
137 6035740 : CSHA256::CSHA256() : bytes(0)
138 : {
139 6035740 : sha256::Initialize(s);
140 6035740 : }
141 :
142 237825700 : CSHA256& CSHA256::Write(const unsigned char* data, size_t len)
143 : {
144 237825700 : const unsigned char* end = data + len;
145 237825700 : size_t bufsize = bytes % 64;
146 237825700 : if (bufsize && bufsize + len >= 64) {
147 : // Fill the buffer, and process it.
148 43830490 : memcpy(buf + bufsize, data, 64 - bufsize);
149 43830490 : bytes += 64 - bufsize;
150 43830490 : data += 64 - bufsize;
151 43830490 : sha256::Transform(s, buf);
152 43830490 : bufsize = 0;
153 : }
154 254784000 : while (end >= data + 64) {
155 : // Process full chunks directly from the source.
156 16959400 : sha256::Transform(s, data);
157 16951780 : bytes += 64;
158 16951780 : data += 64;
159 : }
160 237823700 : if (end > data) {
161 : // Fill the buffer with what remains.
162 221611000 : memcpy(buf + bufsize, data, end - data);
163 221611000 : bytes += end - data;
164 : }
165 237823700 : return *this;
166 : }
167 :
168 10915900 : void CSHA256::Finalize(unsigned char hash[OUTPUT_SIZE])
169 : {
170 10915900 : static const unsigned char pad[64] = {0x80};
171 10915900 : unsigned char sizedesc[8];
172 10915900 : WriteBE64(sizedesc, bytes << 3);
173 10915900 : Write(pad, 1 + ((119 - (bytes % 64)) % 64));
174 10913610 : Write(sizedesc, 8);
175 10921020 : FinalizeNoPadding(hash, false);
176 10920720 : }
177 :
178 10921010 : void CSHA256::FinalizeNoPadding(unsigned char hash[OUTPUT_SIZE], bool enforce_compression)
179 : {
180 10921010 : if (enforce_compression && bytes != 64) {
181 1 : throw std::length_error("SHA256Compress should be invoked with a 512-bit block");
182 : }
183 :
184 10921010 : WriteBE32(hash, s[0]);
185 10921010 : WriteBE32(hash + 4, s[1]);
186 10921010 : WriteBE32(hash + 8, s[2]);
187 10921010 : WriteBE32(hash + 12, s[3]);
188 10921010 : WriteBE32(hash + 16, s[4]);
189 10921010 : WriteBE32(hash + 20, s[5]);
190 10921010 : WriteBE32(hash + 24, s[6]);
191 10921010 : WriteBE32(hash + 28, s[7]);
192 10921010 : }
193 :
194 4872530 : CSHA256& CSHA256::Reset()
195 : {
196 4872530 : bytes = 0;
197 4872530 : sha256::Initialize(s);
198 4872530 : return *this;
199 : }
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