github.com/bir3/gocompiler@v0.9.2202/src/cmd/internal/notsha256/sha256block.go (about) 1 // Copyright 2009 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // SHA256 block step. 6 // In its own file so that a faster assembly or C version 7 // can be substituted easily. 8 9 package notsha256 10 11 import "math/bits" 12 13 var _K = []uint32{ 14 0x428a2f98, 15 0x71374491, 16 0xb5c0fbcf, 17 0xe9b5dba5, 18 0x3956c25b, 19 0x59f111f1, 20 0x923f82a4, 21 0xab1c5ed5, 22 0xd807aa98, 23 0x12835b01, 24 0x243185be, 25 0x550c7dc3, 26 0x72be5d74, 27 0x80deb1fe, 28 0x9bdc06a7, 29 0xc19bf174, 30 0xe49b69c1, 31 0xefbe4786, 32 0x0fc19dc6, 33 0x240ca1cc, 34 0x2de92c6f, 35 0x4a7484aa, 36 0x5cb0a9dc, 37 0x76f988da, 38 0x983e5152, 39 0xa831c66d, 40 0xb00327c8, 41 0xbf597fc7, 42 0xc6e00bf3, 43 0xd5a79147, 44 0x06ca6351, 45 0x14292967, 46 0x27b70a85, 47 0x2e1b2138, 48 0x4d2c6dfc, 49 0x53380d13, 50 0x650a7354, 51 0x766a0abb, 52 0x81c2c92e, 53 0x92722c85, 54 0xa2bfe8a1, 55 0xa81a664b, 56 0xc24b8b70, 57 0xc76c51a3, 58 0xd192e819, 59 0xd6990624, 60 0xf40e3585, 61 0x106aa070, 62 0x19a4c116, 63 0x1e376c08, 64 0x2748774c, 65 0x34b0bcb5, 66 0x391c0cb3, 67 0x4ed8aa4a, 68 0x5b9cca4f, 69 0x682e6ff3, 70 0x748f82ee, 71 0x78a5636f, 72 0x84c87814, 73 0x8cc70208, 74 0x90befffa, 75 0xa4506ceb, 76 0xbef9a3f7, 77 0xc67178f2, 78 } 79 80 func blockGeneric(dig *digest, p []byte) { 81 var w [64]uint32 82 h0, h1, h2, h3, h4, h5, h6, h7 := dig.h[0], dig.h[1], dig.h[2], dig.h[3], dig.h[4], dig.h[5], dig.h[6], dig.h[7] 83 for len(p) >= chunk { 84 // Can interlace the computation of w with the 85 // rounds below if needed for speed. 86 for i := 0; i < 16; i++ { 87 j := i * 4 88 w[i] = uint32(p[j])<<24 | uint32(p[j+1])<<16 | uint32(p[j+2])<<8 | uint32(p[j+3]) 89 } 90 for i := 16; i < 64; i++ { 91 v1 := w[i-2] 92 t1 := (bits.RotateLeft32(v1, -17)) ^ (bits.RotateLeft32(v1, -19)) ^ (v1 >> 10) 93 v2 := w[i-15] 94 t2 := (bits.RotateLeft32(v2, -7)) ^ (bits.RotateLeft32(v2, -18)) ^ (v2 >> 3) 95 w[i] = t1 + w[i-7] + t2 + w[i-16] 96 } 97 98 a, b, c, d, e, f, g, h := h0, h1, h2, h3, h4, h5, h6, h7 99 100 for i := 0; i < 64; i++ { 101 t1 := h + ((bits.RotateLeft32(e, -6)) ^ (bits.RotateLeft32(e, -11)) ^ (bits.RotateLeft32(e, -25))) + ((e & f) ^ (^e & g)) + _K[i] + w[i] 102 103 t2 := ((bits.RotateLeft32(a, -2)) ^ (bits.RotateLeft32(a, -13)) ^ (bits.RotateLeft32(a, -22))) + ((a & b) ^ (a & c) ^ (b & c)) 104 105 h = g 106 g = f 107 f = e 108 e = d + t1 109 d = c 110 c = b 111 b = a 112 a = t1 + t2 113 } 114 115 h0 += a 116 h1 += b 117 h2 += c 118 h3 += d 119 h4 += e 120 h5 += f 121 h6 += g 122 h7 += h 123 124 p = p[chunk:] 125 } 126 127 dig.h[0], dig.h[1], dig.h[2], dig.h[3], dig.h[4], dig.h[5], dig.h[6], dig.h[7] = h0, h1, h2, h3, h4, h5, h6, h7 128 }