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Side by Side Diff: lib/src/sha256.dart

Issue 1350913002: Run the formatter over crypto. (Closed) Base URL: git@github.com:dart-lang/crypto.git@master
Patch Set: Fix a missing value. Created 5 years, 3 months ago
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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 part of crypto; 5 part of crypto;
6 6
7 /** 7 /**
8 * SHA256 hash function implementation. 8 * SHA256 hash function implementation.
9 */ 9 */
10 class SHA256 extends _HashBase { 10 class SHA256 extends _HashBase {
11 final Uint32List _w; 11 final Uint32List _w;
12 12
13 // Construct a SHA256 hasher object. 13 // Construct a SHA256 hasher object.
14 SHA256() : _w = new Uint32List(64), super(16, 8, true) { 14 SHA256()
15 : _w = new Uint32List(64),
16 super(16, 8, true) {
15 // Initial value of the hash parts. First 32 bits of the fractional parts 17 // Initial value of the hash parts. First 32 bits of the fractional parts
16 // of the square roots of the first 8 prime numbers. 18 // of the square roots of the first 8 prime numbers.
17 _h[0] = 0x6a09e667; 19 _h[0] = 0x6a09e667;
18 _h[1] = 0xbb67ae85; 20 _h[1] = 0xbb67ae85;
19 _h[2] = 0x3c6ef372; 21 _h[2] = 0x3c6ef372;
20 _h[3] = 0xa54ff53a; 22 _h[3] = 0xa54ff53a;
21 _h[4] = 0x510e527f; 23 _h[4] = 0x510e527f;
22 _h[5] = 0x9b05688c; 24 _h[5] = 0x9b05688c;
23 _h[6] = 0x1f83d9ab; 25 _h[6] = 0x1f83d9ab;
24 _h[7] = 0x5be0cd19; 26 _h[7] = 0x5be0cd19;
25 } 27 }
26 28
27 // Returns a new instance of this Hash. 29 // Returns a new instance of this Hash.
28 SHA256 newInstance() { 30 SHA256 newInstance() {
29 return new SHA256(); 31 return new SHA256();
30 } 32 }
31 33
32 // Table of round constants. First 32 bits of the fractional 34 // Table of round constants. First 32 bits of the fractional
33 // parts of the cube roots of the first 64 prime numbers. 35 // parts of the cube roots of the first 64 prime numbers.
34 static const List<int> _K = 36 static const List<int> _K = const [
35 const [ 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 37 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
36 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 38 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
37 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 39 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
38 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 40 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
39 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 41 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
40 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 42 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
41 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 43 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
42 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 44 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
43 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 45 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
44 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 46 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
45 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 47 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
46 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 48 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
47 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 ]; 49 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
50 ];
48 51
49 // Helper functions as defined in http://tools.ietf.org/html/rfc6234 52 // Helper functions as defined in http://tools.ietf.org/html/rfc6234
50 _rotr32(n, x) => (x >> n) | ((x << (32 - n)) & _MASK_32); 53 _rotr32(n, x) => (x >> n) | ((x << (32 - n)) & _MASK_32);
51 _ch(x, y, z) => (x & y) ^ ((~x & _MASK_32) & z); 54 _ch(x, y, z) => (x & y) ^ ((~x & _MASK_32) & z);
52 _maj(x, y, z) => (x & y) ^ (x & z) ^ (y & z); 55 _maj(x, y, z) => (x & y) ^ (x & z) ^ (y & z);
53 _bsig0(x) => _rotr32(2, x) ^ _rotr32(13, x) ^ _rotr32(22, x); 56 _bsig0(x) => _rotr32(2, x) ^ _rotr32(13, x) ^ _rotr32(22, x);
54 _bsig1(x) => _rotr32(6, x) ^ _rotr32(11, x) ^ _rotr32(25, x); 57 _bsig1(x) => _rotr32(6, x) ^ _rotr32(11, x) ^ _rotr32(25, x);
55 _ssig0(x) => _rotr32(7, x) ^ _rotr32(18, x) ^ (x >> 3); 58 _ssig0(x) => _rotr32(7, x) ^ _rotr32(18, x) ^ (x >> 3);
56 _ssig1(x) => _rotr32(17, x) ^ _rotr32(19, x) ^ (x >> 10); 59 _ssig1(x) => _rotr32(17, x) ^ _rotr32(19, x) ^ (x >> 10);
57 60
58 // Compute one iteration of the SHA256 algorithm with a chunk of 61 // Compute one iteration of the SHA256 algorithm with a chunk of
59 // 16 32-bit pieces. 62 // 16 32-bit pieces.
60 void _updateHash(Uint32List M) { 63 void _updateHash(Uint32List M) {
61 assert(M.length == 16); 64 assert(M.length == 16);
62 65
63 // Prepare message schedule. 66 // Prepare message schedule.
64 var i = 0; 67 var i = 0;
65 for (; i < 16; i++) { 68 for (; i < 16; i++) {
66 _w[i] = M[i]; 69 _w[i] = M[i];
67 } 70 }
68 for (; i < 64; i++) { 71 for (; i < 64; i++) {
69 _w[i] = _add32(_add32(_ssig1(_w[i - 2]), _w[i - 7]), 72 _w[i] = _add32(_add32(_ssig1(_w[i - 2]), _w[i - 7]),
70 _add32(_ssig0(_w[i - 15]), _w[i - 16])); 73 _add32(_ssig0(_w[i - 15]), _w[i - 16]));
71 } 74 }
72 75
73 // Shuffle around the bits. 76 // Shuffle around the bits.
74 var a = _h[0]; 77 var a = _h[0];
75 var b = _h[1]; 78 var b = _h[1];
76 var c = _h[2]; 79 var c = _h[2];
77 var d = _h[3]; 80 var d = _h[3];
78 var e = _h[4]; 81 var e = _h[4];
79 var f = _h[5]; 82 var f = _h[5];
80 var g = _h[6]; 83 var g = _h[6];
81 var h = _h[7]; 84 var h = _h[7];
82 85
83 for (var t = 0; t < 64; t++) { 86 for (var t = 0; t < 64; t++) {
84 var t1 = _add32(_add32(h, _bsig1(e)), 87 var t1 = _add32(
85 _add32(_ch(e, f, g), _add32(_K[t], _w[t]))); 88 _add32(h, _bsig1(e)), _add32(_ch(e, f, g), _add32(_K[t], _w[t])));
86 var t2 = _add32(_bsig0(a), _maj(a, b, c)); 89 var t2 = _add32(_bsig0(a), _maj(a, b, c));
87 h = g; 90 h = g;
88 g = f; 91 g = f;
89 f = e; 92 f = e;
90 e = _add32(d, t1); 93 e = _add32(d, t1);
91 d = c; 94 d = c;
92 c = b; 95 c = b;
93 b = a; 96 b = a;
94 a = _add32(t1, t2); 97 a = _add32(t1, t2);
95 } 98 }
96 99
97 // Update hash values after iteration. 100 // Update hash values after iteration.
98 _h[0] = _add32(a, _h[0]); 101 _h[0] = _add32(a, _h[0]);
99 _h[1] = _add32(b, _h[1]); 102 _h[1] = _add32(b, _h[1]);
100 _h[2] = _add32(c, _h[2]); 103 _h[2] = _add32(c, _h[2]);
101 _h[3] = _add32(d, _h[3]); 104 _h[3] = _add32(d, _h[3]);
102 _h[4] = _add32(e, _h[4]); 105 _h[4] = _add32(e, _h[4]);
103 _h[5] = _add32(f, _h[5]); 106 _h[5] = _add32(f, _h[5]);
104 _h[6] = _add32(g, _h[6]); 107 _h[6] = _add32(g, _h[6]);
105 _h[7] = _add32(h, _h[7]); 108 _h[7] = _add32(h, _h[7]);
106 } 109 }
107 } 110 }
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