libgo/go/crypto/md5/md5block.go

   1 // Copyright 2013 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 // DO NOT EDIT.
   6 // Generate with: go run gen.go -full | gofmt >md5block.go
   7
   8 // +build !amd64,!386,!arm
   9
  10 package md5
  11
  12 import (
  13         "runtime"
  14         "unsafe"
  15 )
  16
  17 const x86 = runtime.GOARCH == "amd64" || runtime.GOARCH == "386"
  18
  19 var littleEndian bool
  20
  21 func init() {
  22         x := uint32(0x04030201)
  23         y := [4]byte{0x1, 0x2, 0x3, 0x4}
  24         littleEndian = *(*[4]byte)(unsafe.Pointer(&x)) == y
  25 }
  26
  27 func block(dig *digest, p []byte) {
  28         a := dig.s[0]
  29         b := dig.s[1]
  30         c := dig.s[2]
  31         d := dig.s[3]
  32         var X *[16]uint32
  33         var xbuf [16]uint32
  34         for len(p) >= chunk {
  35                 aa, bb, cc, dd := a, b, c, d
  36
  37                 // This is a constant condition - it is not evaluated on each iteration.
  38                 if x86 {
  39                         // MD5 was designed so that x86 processors can just iterate
  40                         // over the block data directly as uint32s, and we generate
  41                         // less code and run 1.3x faster if we take advantage of that.
  42                         // My apologies.
  43                         X = (*[16]uint32)(unsafe.Pointer(&p[0]))
  44                 } else if littleEndian && uintptr(unsafe.Pointer(&p[0]))&(unsafe.Alignof(uint32(0))-1) == 0 {
  45                         X = (*[16]uint32)(unsafe.Pointer(&p[0]))
  46                 } else {
  47                         X = &xbuf
  48                         j := 0
  49                         for i := 0; i < 16; i++ {
  50                                 X[i&15] = uint32(p[j]) | uint32(p[j+1])<<8 | uint32(p[j+2])<<16 | uint32(p[j+3])<<24
  51                                 j += 4
  52                         }
  53                 }
  54
  55                 // Round 1.
  56
  57                 a += (((c ^ d) & b) ^ d) + X[0] + 3614090360
  58                 a = a<<7 | a>>(32-7) + b
  59
  60                 d += (((b ^ c) & a) ^ c) + X[1] + 3905402710
  61                 d = d<<12 | d>>(32-12) + a
  62
  63                 c += (((a ^ b) & d) ^ b) + X[2] + 606105819
  64                 c = c<<17 | c>>(32-17) + d
  65
  66                 b += (((d ^ a) & c) ^ a) + X[3] + 3250441966
  67                 b = b<<22 | b>>(32-22) + c
  68
  69                 a += (((c ^ d) & b) ^ d) + X[4] + 4118548399
  70                 a = a<<7 | a>>(32-7) + b
  71
  72                 d += (((b ^ c) & a) ^ c) + X[5] + 1200080426
  73                 d = d<<12 | d>>(32-12) + a
  74
  75                 c += (((a ^ b) & d) ^ b) + X[6] + 2821735955
  76                 c = c<<17 | c>>(32-17) + d
  77
  78                 b += (((d ^ a) & c) ^ a) + X[7] + 4249261313
  79                 b = b<<22 | b>>(32-22) + c
  80
  81                 a += (((c ^ d) & b) ^ d) + X[8] + 1770035416
  82                 a = a<<7 | a>>(32-7) + b
  83
  84                 d += (((b ^ c) & a) ^ c) + X[9] + 2336552879
  85                 d = d<<12 | d>>(32-12) + a
  86
  87                 c += (((a ^ b) & d) ^ b) + X[10] + 4294925233
  88                 c = c<<17 | c>>(32-17) + d
  89
  90                 b += (((d ^ a) & c) ^ a) + X[11] + 2304563134
  91                 b = b<<22 | b>>(32-22) + c
  92
  93                 a += (((c ^ d) & b) ^ d) + X[12] + 1804603682
  94                 a = a<<7 | a>>(32-7) + b
  95
  96                 d += (((b ^ c) & a) ^ c) + X[13] + 4254626195
  97                 d = d<<12 | d>>(32-12) + a
  98
  99                 c += (((a ^ b) & d) ^ b) + X[14] + 2792965006
 100                 c = c<<17 | c>>(32-17) + d
 101
 102                 b += (((d ^ a) & c) ^ a) + X[15] + 1236535329
 103                 b = b<<22 | b>>(32-22) + c
 104
 105                 // Round 2.
 106
 107                 a += (((b ^ c) & d) ^ c) + X[(1+5*0)&15] + 4129170786
 108                 a = a<<5 | a>>(32-5) + b
 109
 110                 d += (((a ^ b) & c) ^ b) + X[(1+5*1)&15] + 3225465664
 111                 d = d<<9 | d>>(32-9) + a
 112
 113                 c += (((d ^ a) & b) ^ a) + X[(1+5*2)&15] + 643717713
 114                 c = c<<14 | c>>(32-14) + d
 115
 116                 b += (((c ^ d) & a) ^ d) + X[(1+5*3)&15] + 3921069994
 117                 b = b<<20 | b>>(32-20) + c
 118
 119                 a += (((b ^ c) & d) ^ c) + X[(1+5*4)&15] + 3593408605
 120                 a = a<<5 | a>>(32-5) + b
 121
 122                 d += (((a ^ b) & c) ^ b) + X[(1+5*5)&15] + 38016083
 123                 d = d<<9 | d>>(32-9) + a
 124
 125                 c += (((d ^ a) & b) ^ a) + X[(1+5*6)&15] + 3634488961
 126                 c = c<<14 | c>>(32-14) + d
 127
 128                 b += (((c ^ d) & a) ^ d) + X[(1+5*7)&15] + 3889429448
 129                 b = b<<20 | b>>(32-20) + c
 130
 131                 a += (((b ^ c) & d) ^ c) + X[(1+5*8)&15] + 568446438
 132                 a = a<<5 | a>>(32-5) + b
 133
 134                 d += (((a ^ b) & c) ^ b) + X[(1+5*9)&15] + 3275163606
 135                 d = d<<9 | d>>(32-9) + a
 136
 137                 c += (((d ^ a) & b) ^ a) + X[(1+5*10)&15] + 4107603335
 138                 c = c<<14 | c>>(32-14) + d
 139
 140                 b += (((c ^ d) & a) ^ d) + X[(1+5*11)&15] + 1163531501
 141                 b = b<<20 | b>>(32-20) + c
 142
 143                 a += (((b ^ c) & d) ^ c) + X[(1+5*12)&15] + 2850285829
 144                 a = a<<5 | a>>(32-5) + b
 145
 146                 d += (((a ^ b) & c) ^ b) + X[(1+5*13)&15] + 4243563512
 147                 d = d<<9 | d>>(32-9) + a
 148
 149                 c += (((d ^ a) & b) ^ a) + X[(1+5*14)&15] + 1735328473
 150                 c = c<<14 | c>>(32-14) + d
 151
 152                 b += (((c ^ d) & a) ^ d) + X[(1+5*15)&15] + 2368359562
 153                 b = b<<20 | b>>(32-20) + c
 154
 155                 // Round 3.
 156
 157                 a += (b ^ c ^ d) + X[(5+3*0)&15] + 4294588738
 158                 a = a<<4 | a>>(32-4) + b
 159
 160                 d += (a ^ b ^ c) + X[(5+3*1)&15] + 2272392833
 161                 d = d<<11 | d>>(32-11) + a
 162
 163                 c += (d ^ a ^ b) + X[(5+3*2)&15] + 1839030562
 164                 c = c<<16 | c>>(32-16) + d
 165
 166                 b += (c ^ d ^ a) + X[(5+3*3)&15] + 4259657740
 167                 b = b<<23 | b>>(32-23) + c
 168
 169                 a += (b ^ c ^ d) + X[(5+3*4)&15] + 2763975236
 170                 a = a<<4 | a>>(32-4) + b
 171
 172                 d += (a ^ b ^ c) + X[(5+3*5)&15] + 1272893353
 173                 d = d<<11 | d>>(32-11) + a
 174
 175                 c += (d ^ a ^ b) + X[(5+3*6)&15] + 4139469664
 176                 c = c<<16 | c>>(32-16) + d
 177
 178                 b += (c ^ d ^ a) + X[(5+3*7)&15] + 3200236656
 179                 b = b<<23 | b>>(32-23) + c
 180
 181                 a += (b ^ c ^ d) + X[(5+3*8)&15] + 681279174
 182                 a = a<<4 | a>>(32-4) + b
 183
 184                 d += (a ^ b ^ c) + X[(5+3*9)&15] + 3936430074
 185                 d = d<<11 | d>>(32-11) + a
 186
 187                 c += (d ^ a ^ b) + X[(5+3*10)&15] + 3572445317
 188                 c = c<<16 | c>>(32-16) + d
 189
 190                 b += (c ^ d ^ a) + X[(5+3*11)&15] + 76029189
 191                 b = b<<23 | b>>(32-23) + c
 192
 193                 a += (b ^ c ^ d) + X[(5+3*12)&15] + 3654602809
 194                 a = a<<4 | a>>(32-4) + b
 195
 196                 d += (a ^ b ^ c) + X[(5+3*13)&15] + 3873151461
 197                 d = d<<11 | d>>(32-11) + a
 198
 199                 c += (d ^ a ^ b) + X[(5+3*14)&15] + 530742520
 200                 c = c<<16 | c>>(32-16) + d
 201
 202                 b += (c ^ d ^ a) + X[(5+3*15)&15] + 3299628645
 203                 b = b<<23 | b>>(32-23) + c
 204
 205                 // Round 4.
 206
 207                 a += (c ^ (b | ^d)) + X[(7*0)&15] + 4096336452
 208                 a = a<<6 | a>>(32-6) + b
 209
 210                 d += (b ^ (a | ^c)) + X[(7*1)&15] + 1126891415
 211                 d = d<<10 | d>>(32-10) + a
 212
 213                 c += (a ^ (d | ^b)) + X[(7*2)&15] + 2878612391
 214                 c = c<<15 | c>>(32-15) + d
 215
 216                 b += (d ^ (c | ^a)) + X[(7*3)&15] + 4237533241
 217                 b = b<<21 | b>>(32-21) + c
 218
 219                 a += (c ^ (b | ^d)) + X[(7*4)&15] + 1700485571
 220                 a = a<<6 | a>>(32-6) + b
 221
 222                 d += (b ^ (a | ^c)) + X[(7*5)&15] + 2399980690
 223                 d = d<<10 | d>>(32-10) + a
 224
 225                 c += (a ^ (d | ^b)) + X[(7*6)&15] + 4293915773
 226                 c = c<<15 | c>>(32-15) + d
 227
 228                 b += (d ^ (c | ^a)) + X[(7*7)&15] + 2240044497
 229                 b = b<<21 | b>>(32-21) + c
 230
 231                 a += (c ^ (b | ^d)) + X[(7*8)&15] + 1873313359
 232                 a = a<<6 | a>>(32-6) + b
 233
 234                 d += (b ^ (a | ^c)) + X[(7*9)&15] + 4264355552
 235                 d = d<<10 | d>>(32-10) + a
 236
 237                 c += (a ^ (d | ^b)) + X[(7*10)&15] + 2734768916
 238                 c = c<<15 | c>>(32-15) + d
 239
 240                 b += (d ^ (c | ^a)) + X[(7*11)&15] + 1309151649
 241                 b = b<<21 | b>>(32-21) + c
 242
 243                 a += (c ^ (b | ^d)) + X[(7*12)&15] + 4149444226
 244                 a = a<<6 | a>>(32-6) + b
 245
 246                 d += (b ^ (a | ^c)) + X[(7*13)&15] + 3174756917
 247                 d = d<<10 | d>>(32-10) + a
 248
 249                 c += (a ^ (d | ^b)) + X[(7*14)&15] + 718787259
 250                 c = c<<15 | c>>(32-15) + d
 251
 252                 b += (d ^ (c | ^a)) + X[(7*15)&15] + 3951481745
 253                 b = b<<21 | b>>(32-21) + c
 254
 255                 a += aa
 256                 b += bb
 257                 c += cc
 258                 d += dd
 259
 260                 p = p[chunk:]
 261         }
 262
 263         dig.s[0] = a
 264         dig.s[1] = b
 265         dig.s[2] = c
 266         dig.s[3] = d
 267 }