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