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