| // Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import 'dart:typed_data'; |
| |
| import 'digest.dart'; |
| import 'hash_sink.dart'; |
| |
| abstract class _Sha64BitSink extends HashSink { |
| int get digestBytes; |
| |
| @override |
| Uint32List get digest { |
| var unordered = _digest.buffer.asUint32List(); |
| var ordered = Uint32List(digestBytes); |
| for (var i = 0; i < digestBytes; i++) { |
| ordered[i] = unordered[i + (i.isEven ? 1 : -1)]; |
| } |
| return ordered; |
| } |
| |
| // Initial value of the hash parts. First 64 bits of the fractional parts |
| // of the square roots of the ninth through sixteenth prime numbers. |
| final Uint64List _digest; |
| |
| /// The sixteen words from the original chunk, extended to 64 words. |
| /// |
| /// This is an instance variable to avoid re-allocating, but its data isn't |
| /// used across invocations of [updateHash]. |
| final _extended = Uint64List(80); |
| |
| _Sha64BitSink(Sink<Digest> sink, this._digest) |
| : super(sink, 32, signatureBytes: 16); |
| // The following helper functions are taken directly from |
| // http://tools.ietf.org/html/rfc6234. |
| |
| static int _rotr64(int n, int x) => _shr64(n, x) | (x << (64 - n)); |
| static int _shr64(int n, int x) => (x >> n) & ~(-1 << (64 - n)); |
| |
| static int _ch(int x, int y, int z) => (x & y) ^ (~x & z); |
| static int _maj(int x, int y, int z) => (x & y) ^ (x & z) ^ (y & z); |
| static int _bsig0(int x) => _rotr64(28, x) ^ _rotr64(34, x) ^ _rotr64(39, x); |
| static int _bsig1(int x) => _rotr64(14, x) ^ _rotr64(18, x) ^ _rotr64(41, x); |
| static int _ssig0(int x) => _rotr64(1, x) ^ _rotr64(8, x) ^ _shr64(7, x); |
| static int _ssig1(int x) => _rotr64(19, x) ^ _rotr64(61, x) ^ _shr64(6, x); |
| |
| @override |
| void updateHash(Uint32List chunk) { |
| assert(chunk.length == 32); |
| |
| // Prepare message schedule. |
| for (var i = 0, x = 0; i < 32; i += 2, x++) { |
| _extended[x] = (chunk[i] << 32) | chunk[i + 1]; |
| } |
| |
| for (var t = 16; t < 80; t++) { |
| _extended[t] = _ssig1(_extended[t - 2]) + |
| _extended[t - 7] + |
| _ssig0(_extended[t - 15]) + |
| _extended[t - 16]; |
| } |
| |
| // Shuffle around the bits. |
| var a = _digest[0]; |
| var b = _digest[1]; |
| var c = _digest[2]; |
| var d = _digest[3]; |
| var e = _digest[4]; |
| var f = _digest[5]; |
| var g = _digest[6]; |
| var h = _digest[7]; |
| |
| for (var i = 0; i < 80; i++) { |
| var temp1 = h + _bsig1(e) + _ch(e, f, g) + _noise64[i] + _extended[i]; |
| var temp2 = _bsig0(a) + _maj(a, b, c); |
| h = g; |
| g = f; |
| f = e; |
| e = d + temp1; |
| d = c; |
| c = b; |
| b = a; |
| a = temp1 + temp2; |
| } |
| |
| // Update hash values after iteration. |
| _digest[0] += a; |
| _digest[1] += b; |
| _digest[2] += c; |
| _digest[3] += d; |
| _digest[4] += e; |
| _digest[5] += f; |
| _digest[6] += g; |
| _digest[7] += h; |
| } |
| } |
| |
| /// The concrete implementation of [Sha384]. |
| /// |
| /// This is separate so that it can extend [HashSink] without leaking additional |
| /// public members. |
| class Sha384Sink extends _Sha64BitSink { |
| @override |
| final digestBytes = 12; |
| |
| Sha384Sink(Sink<Digest> sink) |
| : super( |
| sink, |
| Uint64List.fromList([ |
| 0xcbbb9d5dc1059ed8, |
| 0x629a292a367cd507, |
| 0x9159015a3070dd17, |
| 0x152fecd8f70e5939, |
| 0x67332667ffc00b31, |
| 0x8eb44a8768581511, |
| 0xdb0c2e0d64f98fa7, |
| 0x47b5481dbefa4fa4, |
| ])); |
| } |
| |
| /// The concrete implementation of [Sha512]. |
| /// |
| /// This is separate so that it can extend [HashSink] without leaking additional |
| /// public members. |
| class Sha512Sink extends _Sha64BitSink { |
| @override |
| final digestBytes = 16; |
| |
| Sha512Sink(Sink<Digest> sink) |
| : super( |
| sink, |
| Uint64List.fromList([ |
| // Initial value of the hash parts. First 64 bits of the fractional |
| // parts of the square roots of the first eight prime numbers. |
| 0x6a09e667f3bcc908, |
| 0xbb67ae8584caa73b, |
| 0x3c6ef372fe94f82b, |
| 0xa54ff53a5f1d36f1, |
| 0x510e527fade682d1, |
| 0x9b05688c2b3e6c1f, |
| 0x1f83d9abfb41bd6b, |
| 0x5be0cd19137e2179, |
| ])); |
| } |
| |
| final _noise64 = Uint64List.fromList([ |
| 0x428a2f98d728ae22, |
| 0x7137449123ef65cd, |
| 0xb5c0fbcfec4d3b2f, |
| 0xe9b5dba58189dbbc, |
| 0x3956c25bf348b538, |
| 0x59f111f1b605d019, |
| 0x923f82a4af194f9b, |
| 0xab1c5ed5da6d8118, |
| 0xd807aa98a3030242, |
| 0x12835b0145706fbe, |
| 0x243185be4ee4b28c, |
| 0x550c7dc3d5ffb4e2, |
| 0x72be5d74f27b896f, |
| 0x80deb1fe3b1696b1, |
| 0x9bdc06a725c71235, |
| 0xc19bf174cf692694, |
| 0xe49b69c19ef14ad2, |
| 0xefbe4786384f25e3, |
| 0x0fc19dc68b8cd5b5, |
| 0x240ca1cc77ac9c65, |
| 0x2de92c6f592b0275, |
| 0x4a7484aa6ea6e483, |
| 0x5cb0a9dcbd41fbd4, |
| 0x76f988da831153b5, |
| 0x983e5152ee66dfab, |
| 0xa831c66d2db43210, |
| 0xb00327c898fb213f, |
| 0xbf597fc7beef0ee4, |
| 0xc6e00bf33da88fc2, |
| 0xd5a79147930aa725, |
| 0x06ca6351e003826f, |
| 0x142929670a0e6e70, |
| 0x27b70a8546d22ffc, |
| 0x2e1b21385c26c926, |
| 0x4d2c6dfc5ac42aed, |
| 0x53380d139d95b3df, |
| 0x650a73548baf63de, |
| 0x766a0abb3c77b2a8, |
| 0x81c2c92e47edaee6, |
| 0x92722c851482353b, |
| 0xa2bfe8a14cf10364, |
| 0xa81a664bbc423001, |
| 0xc24b8b70d0f89791, |
| 0xc76c51a30654be30, |
| 0xd192e819d6ef5218, |
| 0xd69906245565a910, |
| 0xf40e35855771202a, |
| 0x106aa07032bbd1b8, |
| 0x19a4c116b8d2d0c8, |
| 0x1e376c085141ab53, |
| 0x2748774cdf8eeb99, |
| 0x34b0bcb5e19b48a8, |
| 0x391c0cb3c5c95a63, |
| 0x4ed8aa4ae3418acb, |
| 0x5b9cca4f7763e373, |
| 0x682e6ff3d6b2b8a3, |
| 0x748f82ee5defb2fc, |
| 0x78a5636f43172f60, |
| 0x84c87814a1f0ab72, |
| 0x8cc702081a6439ec, |
| 0x90befffa23631e28, |
| 0xa4506cebde82bde9, |
| 0xbef9a3f7b2c67915, |
| 0xc67178f2e372532b, |
| 0xca273eceea26619c, |
| 0xd186b8c721c0c207, |
| 0xeada7dd6cde0eb1e, |
| 0xf57d4f7fee6ed178, |
| 0x06f067aa72176fba, |
| 0x0a637dc5a2c898a6, |
| 0x113f9804bef90dae, |
| 0x1b710b35131c471b, |
| 0x28db77f523047d84, |
| 0x32caab7b40c72493, |
| 0x3c9ebe0a15c9bebc, |
| 0x431d67c49c100d4c, |
| 0x4cc5d4becb3e42b6, |
| 0x597f299cfc657e2a, |
| 0x5fcb6fab3ad6faec, |
| 0x6c44198c4a475817, |
| ]); |