Line data Source code
1 : // Copyright (c) 2014 The Bitcoin Core 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 :
11 : // Internal implementation code.
12 : namespace
13 : {
14 : /// Internal SHA-256 implementation.
15 : namespace sha256
16 : {
17 352474240 : uint32_t inline Ch(uint32_t x, uint32_t y, uint32_t z) { return z ^ (x & (y ^ z)); }
18 352474240 : uint32_t inline Maj(uint32_t x, uint32_t y, uint32_t z) { return (x & y) | (z & (x | y)); }
19 352474240 : uint32_t inline Sigma0(uint32_t x) { return (x >> 2 | x << 30) ^ (x >> 13 | x << 19) ^ (x >> 22 | x << 10); }
20 352474240 : uint32_t inline Sigma1(uint32_t x) { return (x >> 6 | x << 26) ^ (x >> 11 | x << 21) ^ (x >> 25 | x << 7); }
21 264356006 : uint32_t inline sigma0(uint32_t x) { return (x >> 7 | x << 25) ^ (x >> 18 | x << 14) ^ (x >> 3); }
22 264356006 : uint32_t inline sigma1(uint32_t x) { return (x >> 17 | x << 15) ^ (x >> 19 | x << 13) ^ (x >> 10); }
23 :
24 : /** One round of SHA-256. */
25 352474240 : 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)
26 : {
27 1057422720 : uint32_t t1 = h + Sigma1(e) + Ch(e, f, g) + k + w;
28 704948480 : uint32_t t2 = Sigma0(a) + Maj(a, b, c);
29 352474240 : d += t1;
30 352474240 : h = t1 + t2;
31 352474240 : }
32 :
33 : /** Initialize SHA-256 state. */
34 : void inline Initialize(uint32_t* s)
35 : {
36 2214626 : s[0] = 0x6a09e667ul;
37 2214626 : s[1] = 0xbb67ae85ul;
38 2214626 : s[2] = 0x3c6ef372ul;
39 2214626 : s[3] = 0xa54ff53aul;
40 2214626 : s[4] = 0x510e527ful;
41 2214626 : s[5] = 0x9b05688cul;
42 2214626 : s[6] = 0x1f83d9abul;
43 2214626 : s[7] = 0x5be0cd19ul;
44 : }
45 :
46 : /** Perform one SHA-256 transformation, processing a 64-byte chunk. */
47 5507043 : void Transform(uint32_t* s, const unsigned char* chunk)
48 : {
49 5507043 : 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];
50 : uint32_t w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13, w14, w15;
51 :
52 5507043 : Round(a, b, c, d, e, f, g, h, 0x428a2f98, w0 = ReadBE32(chunk + 0));
53 11014100 : Round(h, a, b, c, d, e, f, g, 0x71374491, w1 = ReadBE32(chunk + 4));
54 11014222 : Round(g, h, a, b, c, d, e, f, 0xb5c0fbcf, w2 = ReadBE32(chunk + 8));
55 11014304 : Round(f, g, h, a, b, c, d, e, 0xe9b5dba5, w3 = ReadBE32(chunk + 12));
56 11014378 : Round(e, f, g, h, a, b, c, d, 0x3956c25b, w4 = ReadBE32(chunk + 16));
57 11014510 : Round(d, e, f, g, h, a, b, c, 0x59f111f1, w5 = ReadBE32(chunk + 20));
58 11014548 : Round(c, d, e, f, g, h, a, b, 0x923f82a4, w6 = ReadBE32(chunk + 24));
59 11014600 : Round(b, c, d, e, f, g, h, a, 0xab1c5ed5, w7 = ReadBE32(chunk + 28));
60 11014606 : Round(a, b, c, d, e, f, g, h, 0xd807aa98, w8 = ReadBE32(chunk + 32));
61 11014616 : Round(h, a, b, c, d, e, f, g, 0x12835b01, w9 = ReadBE32(chunk + 36));
62 11014634 : Round(g, h, a, b, c, d, e, f, 0x243185be, w10 = ReadBE32(chunk + 40));
63 11014636 : Round(f, g, h, a, b, c, d, e, 0x550c7dc3, w11 = ReadBE32(chunk + 44));
64 11014656 : Round(e, f, g, h, a, b, c, d, 0x72be5d74, w12 = ReadBE32(chunk + 48));
65 11014652 : Round(d, e, f, g, h, a, b, c, 0x80deb1fe, w13 = ReadBE32(chunk + 52));
66 11014676 : Round(c, d, e, f, g, h, a, b, 0x9bdc06a7, w14 = ReadBE32(chunk + 56));
67 11014708 : Round(b, c, d, e, f, g, h, a, 0xc19bf174, w15 = ReadBE32(chunk + 60));
68 :
69 11014712 : Round(a, b, c, d, e, f, g, h, 0xe49b69c1, w0 += sigma1(w14) + w9 + sigma0(w1));
70 11014750 : Round(h, a, b, c, d, e, f, g, 0xefbe4786, w1 += sigma1(w15) + w10 + sigma0(w2));
71 11014780 : Round(g, h, a, b, c, d, e, f, 0x0fc19dc6, w2 += sigma1(w0) + w11 + sigma0(w3));
72 11014784 : Round(f, g, h, a, b, c, d, e, 0x240ca1cc, w3 += sigma1(w1) + w12 + sigma0(w4));
73 11014808 : Round(e, f, g, h, a, b, c, d, 0x2de92c6f, w4 += sigma1(w2) + w13 + sigma0(w5));
74 11014814 : Round(d, e, f, g, h, a, b, c, 0x4a7484aa, w5 += sigma1(w3) + w14 + sigma0(w6));
75 11014826 : Round(c, d, e, f, g, h, a, b, 0x5cb0a9dc, w6 += sigma1(w4) + w15 + sigma0(w7));
76 11014830 : Round(b, c, d, e, f, g, h, a, 0x76f988da, w7 += sigma1(w5) + w0 + sigma0(w8));
77 11014830 : Round(a, b, c, d, e, f, g, h, 0x983e5152, w8 += sigma1(w6) + w1 + sigma0(w9));
78 11014830 : Round(h, a, b, c, d, e, f, g, 0xa831c66d, w9 += sigma1(w7) + w2 + sigma0(w10));
79 11014832 : Round(g, h, a, b, c, d, e, f, 0xb00327c8, w10 += sigma1(w8) + w3 + sigma0(w11));
80 11014830 : Round(f, g, h, a, b, c, d, e, 0xbf597fc7, w11 += sigma1(w9) + w4 + sigma0(w12));
81 11014836 : Round(e, f, g, h, a, b, c, d, 0xc6e00bf3, w12 += sigma1(w10) + w5 + sigma0(w13));
82 11014836 : Round(d, e, f, g, h, a, b, c, 0xd5a79147, w13 += sigma1(w11) + w6 + sigma0(w14));
83 11014834 : Round(c, d, e, f, g, h, a, b, 0x06ca6351, w14 += sigma1(w12) + w7 + sigma0(w15));
84 11014840 : Round(b, c, d, e, f, g, h, a, 0x14292967, w15 += sigma1(w13) + w8 + sigma0(w0));
85 :
86 11014834 : Round(a, b, c, d, e, f, g, h, 0x27b70a85, w0 += sigma1(w14) + w9 + sigma0(w1));
87 11014838 : Round(h, a, b, c, d, e, f, g, 0x2e1b2138, w1 += sigma1(w15) + w10 + sigma0(w2));
88 11014840 : Round(g, h, a, b, c, d, e, f, 0x4d2c6dfc, w2 += sigma1(w0) + w11 + sigma0(w3));
89 11014840 : Round(f, g, h, a, b, c, d, e, 0x53380d13, w3 += sigma1(w1) + w12 + sigma0(w4));
90 11014838 : Round(e, f, g, h, a, b, c, d, 0x650a7354, w4 += sigma1(w2) + w13 + sigma0(w5));
91 11014838 : Round(d, e, f, g, h, a, b, c, 0x766a0abb, w5 += sigma1(w3) + w14 + sigma0(w6));
92 11014842 : Round(c, d, e, f, g, h, a, b, 0x81c2c92e, w6 += sigma1(w4) + w15 + sigma0(w7));
93 11014844 : Round(b, c, d, e, f, g, h, a, 0x92722c85, w7 += sigma1(w5) + w0 + sigma0(w8));
94 11014840 : Round(a, b, c, d, e, f, g, h, 0xa2bfe8a1, w8 += sigma1(w6) + w1 + sigma0(w9));
95 11014840 : Round(h, a, b, c, d, e, f, g, 0xa81a664b, w9 += sigma1(w7) + w2 + sigma0(w10));
96 11014846 : Round(g, h, a, b, c, d, e, f, 0xc24b8b70, w10 += sigma1(w8) + w3 + sigma0(w11));
97 11014844 : Round(f, g, h, a, b, c, d, e, 0xc76c51a3, w11 += sigma1(w9) + w4 + sigma0(w12));
98 11014846 : Round(e, f, g, h, a, b, c, d, 0xd192e819, w12 += sigma1(w10) + w5 + sigma0(w13));
99 11014848 : Round(d, e, f, g, h, a, b, c, 0xd6990624, w13 += sigma1(w11) + w6 + sigma0(w14));
100 11014848 : Round(c, d, e, f, g, h, a, b, 0xf40e3585, w14 += sigma1(w12) + w7 + sigma0(w15));
101 11014848 : Round(b, c, d, e, f, g, h, a, 0x106aa070, w15 += sigma1(w13) + w8 + sigma0(w0));
102 :
103 11014836 : Round(a, b, c, d, e, f, g, h, 0x19a4c116, w0 += sigma1(w14) + w9 + sigma0(w1));
104 11014842 : Round(h, a, b, c, d, e, f, g, 0x1e376c08, w1 += sigma1(w15) + w10 + sigma0(w2));
105 11014844 : Round(g, h, a, b, c, d, e, f, 0x2748774c, w2 += sigma1(w0) + w11 + sigma0(w3));
106 11014848 : Round(f, g, h, a, b, c, d, e, 0x34b0bcb5, w3 += sigma1(w1) + w12 + sigma0(w4));
107 11014850 : Round(e, f, g, h, a, b, c, d, 0x391c0cb3, w4 += sigma1(w2) + w13 + sigma0(w5));
108 11014846 : Round(d, e, f, g, h, a, b, c, 0x4ed8aa4a, w5 += sigma1(w3) + w14 + sigma0(w6));
109 11014850 : Round(c, d, e, f, g, h, a, b, 0x5b9cca4f, w6 += sigma1(w4) + w15 + sigma0(w7));
110 11014850 : Round(b, c, d, e, f, g, h, a, 0x682e6ff3, w7 += sigma1(w5) + w0 + sigma0(w8));
111 11014850 : Round(a, b, c, d, e, f, g, h, 0x748f82ee, w8 += sigma1(w6) + w1 + sigma0(w9));
112 11014850 : Round(h, a, b, c, d, e, f, g, 0x78a5636f, w9 += sigma1(w7) + w2 + sigma0(w10));
113 11014852 : Round(g, h, a, b, c, d, e, f, 0x84c87814, w10 += sigma1(w8) + w3 + sigma0(w11));
114 11014852 : Round(f, g, h, a, b, c, d, e, 0x8cc70208, w11 += sigma1(w9) + w4 + sigma0(w12));
115 11014852 : Round(e, f, g, h, a, b, c, d, 0x90befffa, w12 += sigma1(w10) + w5 + sigma0(w13));
116 11014852 : Round(d, e, f, g, h, a, b, c, 0xa4506ceb, w13 += sigma1(w11) + w6 + sigma0(w14));
117 11014852 : Round(c, d, e, f, g, h, a, b, 0xbef9a3f7, w14 + sigma1(w12) + w7 + sigma0(w15));
118 11014840 : Round(b, c, d, e, f, g, h, a, 0xc67178f2, w15 + sigma1(w13) + w8 + sigma0(w0));
119 :
120 5507419 : s[0] += a;
121 5507419 : s[1] += b;
122 5507419 : s[2] += c;
123 5507419 : s[3] += d;
124 5507419 : s[4] += e;
125 5507419 : s[5] += f;
126 5507419 : s[6] += g;
127 5507419 : s[7] += h;
128 5507419 : }
129 :
130 : } // namespace sha256
131 : } // namespace
132 :
133 :
134 : ////// SHA-256
135 :
136 1125589 : CSHA256::CSHA256() : bytes(0)
137 : {
138 1125589 : sha256::Initialize(s);
139 1125589 : }
140 :
141 14636941 : CSHA256& CSHA256::Write(const unsigned char* data, size_t len)
142 : {
143 14636941 : const unsigned char* end = data + len;
144 14636941 : size_t bufsize = bytes % 64;
145 14636941 : if (bufsize && bufsize + len >= 64) {
146 : // Fill the buffer, and process it.
147 3487307 : memcpy(buf + bufsize, data, 64 - bufsize);
148 3487307 : bytes += 64 - bufsize;
149 3487307 : data += 64 - bufsize;
150 3487307 : sha256::Transform(s, buf);
151 3487307 : bufsize = 0;
152 : }
153 16657119 : while (end >= data + 64) {
154 : // Process full chunks directly from the source.
155 2019707 : sha256::Transform(s, data);
156 2019707 : bytes += 64;
157 2019707 : data += 64;
158 : }
159 14637412 : if (end > data) {
160 : // Fill the buffer with what remains.
161 12081700 : memcpy(buf + bufsize, data, end - data);
162 12081700 : bytes += end - data;
163 : }
164 14637412 : return *this;
165 : }
166 :
167 2222942 : void CSHA256::Finalize(unsigned char hash[OUTPUT_SIZE])
168 : {
169 : static const unsigned char pad[64] = {0x80};
170 : unsigned char sizedesc[8];
171 2222942 : WriteBE64(sizedesc, bytes << 3);
172 2222942 : Write(pad, 1 + ((119 - (bytes % 64)) % 64));
173 2222945 : Write(sizedesc, 8);
174 2222953 : WriteBE32(hash, s[0]);
175 2222953 : WriteBE32(hash + 4, s[1]);
176 2222953 : WriteBE32(hash + 8, s[2]);
177 2222953 : WriteBE32(hash + 12, s[3]);
178 2222953 : WriteBE32(hash + 16, s[4]);
179 2222953 : WriteBE32(hash + 20, s[5]);
180 2222953 : WriteBE32(hash + 24, s[6]);
181 2222953 : WriteBE32(hash + 28, s[7]);
182 2222953 : }
183 :
184 1089037 : CSHA256& CSHA256::Reset()
185 : {
186 1089037 : bytes = 0;
187 1089037 : sha256::Initialize(s);
188 1089037 : return *this;
189 : }
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