vendor/golang.org/x/crypto/blake2s/blake2s_generic.go

   1 // Copyright 2016 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 package blake2s
   6
   7 // the precomputed values for BLAKE2s
   8 // there are 10 16-byte arrays - one for each round
   9 // the entries are calculated from the sigma constants.
  10 var precomputed = [10][16]byte{
  11         {0, 2, 4, 6, 1, 3, 5, 7, 8, 10, 12, 14, 9, 11, 13, 15},
  12         {14, 4, 9, 13, 10, 8, 15, 6, 1, 0, 11, 5, 12, 2, 7, 3},
  13         {11, 12, 5, 15, 8, 0, 2, 13, 10, 3, 7, 9, 14, 6, 1, 4},
  14         {7, 3, 13, 11, 9, 1, 12, 14, 2, 5, 4, 15, 6, 10, 0, 8},
  15         {9, 5, 2, 10, 0, 7, 4, 15, 14, 11, 6, 3, 1, 12, 8, 13},
  16         {2, 6, 0, 8, 12, 10, 11, 3, 4, 7, 15, 1, 13, 5, 14, 9},
  17         {12, 1, 14, 4, 5, 15, 13, 10, 0, 6, 9, 8, 7, 3, 2, 11},
  18         {13, 7, 12, 3, 11, 14, 1, 9, 5, 15, 8, 2, 0, 4, 6, 10},
  19         {6, 14, 11, 0, 15, 9, 3, 8, 12, 13, 1, 10, 2, 7, 4, 5},
  20         {10, 8, 7, 1, 2, 4, 6, 5, 15, 9, 3, 13, 11, 14, 12, 0},
  21 }
  22
  23 func hashBlocksGeneric(h *[8]uint32, c *[2]uint32, flag uint32, blocks []byte) {
  24         var m [16]uint32
  25         c0, c1 := c[0], c[1]
  26
  27         for i := 0; i < len(blocks); {
  28                 c0 += BlockSize
  29                 if c0 < BlockSize {
  30                         c1++
  31                 }
  32
  33                 v0, v1, v2, v3, v4, v5, v6, v7 := h[0], h[1], h[2], h[3], h[4], h[5], h[6], h[7]
  34                 v8, v9, v10, v11, v12, v13, v14, v15 := iv[0], iv[1], iv[2], iv[3], iv[4], iv[5], iv[6], iv[7]
  35                 v12 ^= c0
  36                 v13 ^= c1
  37                 v14 ^= flag
  38
  39                 for j := range m {
  40                         m[j] = uint32(blocks[i]) | uint32(blocks[i+1])<<8 | uint32(blocks[i+2])<<16 | uint32(blocks[i+3])<<24
  41                         i += 4
  42                 }
  43
  44                 for k := range precomputed {
  45                         s := &(precomputed[k])
  46
  47                         v0 += m[s[0]]
  48                         v0 += v4
  49                         v12 ^= v0
  50                         v12 = v12<<(32-16) | v12>>16
  51                         v8 += v12
  52                         v4 ^= v8
  53                         v4 = v4<<(32-12) | v4>>12
  54                         v1 += m[s[1]]
  55                         v1 += v5
  56                         v13 ^= v1
  57                         v13 = v13<<(32-16) | v13>>16
  58                         v9 += v13
  59                         v5 ^= v9
  60                         v5 = v5<<(32-12) | v5>>12
  61                         v2 += m[s[2]]
  62                         v2 += v6
  63                         v14 ^= v2
  64                         v14 = v14<<(32-16) | v14>>16
  65                         v10 += v14
  66                         v6 ^= v10
  67                         v6 = v6<<(32-12) | v6>>12
  68                         v3 += m[s[3]]
  69                         v3 += v7
  70                         v15 ^= v3
  71                         v15 = v15<<(32-16) | v15>>16
  72                         v11 += v15
  73                         v7 ^= v11
  74                         v7 = v7<<(32-12) | v7>>12
  75
  76                         v0 += m[s[4]]
  77                         v0 += v4
  78                         v12 ^= v0
  79                         v12 = v12<<(32-8) | v12>>8
  80                         v8 += v12
  81                         v4 ^= v8
  82                         v4 = v4<<(32-7) | v4>>7
  83                         v1 += m[s[5]]
  84                         v1 += v5
  85                         v13 ^= v1
  86                         v13 = v13<<(32-8) | v13>>8
  87                         v9 += v13
  88                         v5 ^= v9
  89                         v5 = v5<<(32-7) | v5>>7
  90                         v2 += m[s[6]]
  91                         v2 += v6
  92                         v14 ^= v2
  93                         v14 = v14<<(32-8) | v14>>8
  94                         v10 += v14
  95                         v6 ^= v10
  96                         v6 = v6<<(32-7) | v6>>7
  97                         v3 += m[s[7]]
  98                         v3 += v7
  99                         v15 ^= v3
 100                         v15 = v15<<(32-8) | v15>>8
 101                         v11 += v15
 102                         v7 ^= v11
 103                         v7 = v7<<(32-7) | v7>>7
 104
 105                         v0 += m[s[8]]
 106                         v0 += v5
 107                         v15 ^= v0
 108                         v15 = v15<<(32-16) | v15>>16
 109                         v10 += v15
 110                         v5 ^= v10
 111                         v5 = v5<<(32-12) | v5>>12
 112                         v1 += m[s[9]]
 113                         v1 += v6
 114                         v12 ^= v1
 115                         v12 = v12<<(32-16) | v12>>16
 116                         v11 += v12
 117                         v6 ^= v11
 118                         v6 = v6<<(32-12) | v6>>12
 119                         v2 += m[s[10]]
 120                         v2 += v7
 121                         v13 ^= v2
 122                         v13 = v13<<(32-16) | v13>>16
 123                         v8 += v13
 124                         v7 ^= v8
 125                         v7 = v7<<(32-12) | v7>>12
 126                         v3 += m[s[11]]
 127                         v3 += v4
 128                         v14 ^= v3
 129                         v14 = v14<<(32-16) | v14>>16
 130                         v9 += v14
 131                         v4 ^= v9
 132                         v4 = v4<<(32-12) | v4>>12
 133
 134                         v0 += m[s[12]]
 135                         v0 += v5
 136                         v15 ^= v0
 137                         v15 = v15<<(32-8) | v15>>8
 138                         v10 += v15
 139                         v5 ^= v10
 140                         v5 = v5<<(32-7) | v5>>7
 141                         v1 += m[s[13]]
 142                         v1 += v6
 143                         v12 ^= v1
 144                         v12 = v12<<(32-8) | v12>>8
 145                         v11 += v12
 146                         v6 ^= v11
 147                         v6 = v6<<(32-7) | v6>>7
 148                         v2 += m[s[14]]
 149                         v2 += v7
 150                         v13 ^= v2
 151                         v13 = v13<<(32-8) | v13>>8
 152                         v8 += v13
 153                         v7 ^= v8
 154                         v7 = v7<<(32-7) | v7>>7
 155                         v3 += m[s[15]]
 156                         v3 += v4
 157                         v14 ^= v3
 158                         v14 = v14<<(32-8) | v14>>8
 159                         v9 += v14
 160                         v4 ^= v9
 161                         v4 = v4<<(32-7) | v4>>7
 162                 }
 163
 164                 h[0] ^= v0 ^ v8
 165                 h[1] ^= v1 ^ v9
 166                 h[2] ^= v2 ^ v10
 167                 h[3] ^= v3 ^ v11
 168                 h[4] ^= v4 ^ v12
 169                 h[5] ^= v5 ^ v13
 170                 h[6] ^= v6 ^ v14
 171                 h[7] ^= v7 ^ v15
 172         }
 173         c[0], c[1] = c0, c1
 174 }