github.com/graybobo/golang.org-package-offline-cache@v0.0.0-20200626051047-6608995c132f/x/crypto/ripemd160/ripemd160block.go (about) 1 // Copyright 2010 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 // RIPEMD-160 block step. 6 // In its own file so that a faster assembly or C version 7 // can be substituted easily. 8 9 package ripemd160 10 11 // work buffer indices and roll amounts for one line 12 var _n = [80]uint{ 13 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 14 7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8, 15 3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12, 16 1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2, 17 4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13, 18 } 19 20 var _r = [80]uint{ 21 11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8, 22 7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12, 23 11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5, 24 11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12, 25 9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6, 26 } 27 28 // same for the other parallel one 29 var n_ = [80]uint{ 30 5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12, 31 6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2, 32 15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13, 33 8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14, 34 12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11, 35 } 36 37 var r_ = [80]uint{ 38 8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6, 39 9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11, 40 9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5, 41 15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8, 42 8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11, 43 } 44 45 func _Block(md *digest, p []byte) int { 46 n := 0 47 var x [16]uint32 48 var alpha, beta uint32 49 for len(p) >= BlockSize { 50 a, b, c, d, e := md.s[0], md.s[1], md.s[2], md.s[3], md.s[4] 51 aa, bb, cc, dd, ee := a, b, c, d, e 52 j := 0 53 for i := 0; i < 16; i++ { 54 x[i] = uint32(p[j]) | uint32(p[j+1])<<8 | uint32(p[j+2])<<16 | uint32(p[j+3])<<24 55 j += 4 56 } 57 58 // round 1 59 i := 0 60 for i < 16 { 61 alpha = a + (b ^ c ^ d) + x[_n[i]] 62 s := _r[i] 63 alpha = (alpha<<s | alpha>>(32-s)) + e 64 beta = c<<10 | c>>22 65 a, b, c, d, e = e, alpha, b, beta, d 66 67 // parallel line 68 alpha = aa + (bb ^ (cc | ^dd)) + x[n_[i]] + 0x50a28be6 69 s = r_[i] 70 alpha = (alpha<<s | alpha>>(32-s)) + ee 71 beta = cc<<10 | cc>>22 72 aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd 73 74 i++ 75 } 76 77 // round 2 78 for i < 32 { 79 alpha = a + (b&c | ^b&d) + x[_n[i]] + 0x5a827999 80 s := _r[i] 81 alpha = (alpha<<s | alpha>>(32-s)) + e 82 beta = c<<10 | c>>22 83 a, b, c, d, e = e, alpha, b, beta, d 84 85 // parallel line 86 alpha = aa + (bb&dd | cc&^dd) + x[n_[i]] + 0x5c4dd124 87 s = r_[i] 88 alpha = (alpha<<s | alpha>>(32-s)) + ee 89 beta = cc<<10 | cc>>22 90 aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd 91 92 i++ 93 } 94 95 // round 3 96 for i < 48 { 97 alpha = a + (b | ^c ^ d) + x[_n[i]] + 0x6ed9eba1 98 s := _r[i] 99 alpha = (alpha<<s | alpha>>(32-s)) + e 100 beta = c<<10 | c>>22 101 a, b, c, d, e = e, alpha, b, beta, d 102 103 // parallel line 104 alpha = aa + (bb | ^cc ^ dd) + x[n_[i]] + 0x6d703ef3 105 s = r_[i] 106 alpha = (alpha<<s | alpha>>(32-s)) + ee 107 beta = cc<<10 | cc>>22 108 aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd 109 110 i++ 111 } 112 113 // round 4 114 for i < 64 { 115 alpha = a + (b&d | c&^d) + x[_n[i]] + 0x8f1bbcdc 116 s := _r[i] 117 alpha = (alpha<<s | alpha>>(32-s)) + e 118 beta = c<<10 | c>>22 119 a, b, c, d, e = e, alpha, b, beta, d 120 121 // parallel line 122 alpha = aa + (bb&cc | ^bb&dd) + x[n_[i]] + 0x7a6d76e9 123 s = r_[i] 124 alpha = (alpha<<s | alpha>>(32-s)) + ee 125 beta = cc<<10 | cc>>22 126 aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd 127 128 i++ 129 } 130 131 // round 5 132 for i < 80 { 133 alpha = a + (b ^ (c | ^d)) + x[_n[i]] + 0xa953fd4e 134 s := _r[i] 135 alpha = (alpha<<s | alpha>>(32-s)) + e 136 beta = c<<10 | c>>22 137 a, b, c, d, e = e, alpha, b, beta, d 138 139 // parallel line 140 alpha = aa + (bb ^ cc ^ dd) + x[n_[i]] 141 s = r_[i] 142 alpha = (alpha<<s | alpha>>(32-s)) + ee 143 beta = cc<<10 | cc>>22 144 aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd 145 146 i++ 147 } 148 149 // combine results 150 dd += c + md.s[1] 151 md.s[1] = md.s[2] + d + ee 152 md.s[2] = md.s[3] + e + aa 153 md.s[3] = md.s[4] + a + bb 154 md.s[4] = md.s[0] + b + cc 155 md.s[0] = dd 156 157 p = p[BlockSize:] 158 n += BlockSize 159 } 160 return n 161 }