github.com/amazechain/amc@v0.1.3/common/crypto/blake2b/blake2b_generic.go (about)

     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 blake2b
     6  
     7  import (
     8  	"math/bits"
     9  )
    10  
    11  // the precomputed values for BLAKE2b
    12  // there are 10 16-byte arrays - one for each round
    13  // the entries are calculated from the sigma constants.
    14  var precomputed = [10][16]byte{
    15  	{0, 2, 4, 6, 1, 3, 5, 7, 8, 10, 12, 14, 9, 11, 13, 15},
    16  	{14, 4, 9, 13, 10, 8, 15, 6, 1, 0, 11, 5, 12, 2, 7, 3},
    17  	{11, 12, 5, 15, 8, 0, 2, 13, 10, 3, 7, 9, 14, 6, 1, 4},
    18  	{7, 3, 13, 11, 9, 1, 12, 14, 2, 5, 4, 15, 6, 10, 0, 8},
    19  	{9, 5, 2, 10, 0, 7, 4, 15, 14, 11, 6, 3, 1, 12, 8, 13},
    20  	{2, 6, 0, 8, 12, 10, 11, 3, 4, 7, 15, 1, 13, 5, 14, 9},
    21  	{12, 1, 14, 4, 5, 15, 13, 10, 0, 6, 9, 8, 7, 3, 2, 11},
    22  	{13, 7, 12, 3, 11, 14, 1, 9, 5, 15, 8, 2, 0, 4, 6, 10},
    23  	{6, 14, 11, 0, 15, 9, 3, 8, 12, 13, 1, 10, 2, 7, 4, 5},
    24  	{10, 8, 7, 1, 2, 4, 6, 5, 15, 9, 3, 13, 11, 14, 12, 0},
    25  }
    26  
    27  func fGeneric(h *[8]uint64, m *[16]uint64, c0, c1 uint64, flag uint64, rounds uint64) {
    28  	v0, v1, v2, v3, v4, v5, v6, v7 := h[0], h[1], h[2], h[3], h[4], h[5], h[6], h[7]
    29  	v8, v9, v10, v11, v12, v13, v14, v15 := iv[0], iv[1], iv[2], iv[3], iv[4], iv[5], iv[6], iv[7]
    30  	v12 ^= c0
    31  	v13 ^= c1
    32  	v14 ^= flag
    33  
    34  	for i := 0; i < int(rounds); i++ {
    35  		s := &(precomputed[i%10])
    36  
    37  		v0 += m[s[0]]
    38  		v0 += v4
    39  		v12 ^= v0
    40  		v12 = bits.RotateLeft64(v12, -32)
    41  		v8 += v12
    42  		v4 ^= v8
    43  		v4 = bits.RotateLeft64(v4, -24)
    44  		v1 += m[s[1]]
    45  		v1 += v5
    46  		v13 ^= v1
    47  		v13 = bits.RotateLeft64(v13, -32)
    48  		v9 += v13
    49  		v5 ^= v9
    50  		v5 = bits.RotateLeft64(v5, -24)
    51  		v2 += m[s[2]]
    52  		v2 += v6
    53  		v14 ^= v2
    54  		v14 = bits.RotateLeft64(v14, -32)
    55  		v10 += v14
    56  		v6 ^= v10
    57  		v6 = bits.RotateLeft64(v6, -24)
    58  		v3 += m[s[3]]
    59  		v3 += v7
    60  		v15 ^= v3
    61  		v15 = bits.RotateLeft64(v15, -32)
    62  		v11 += v15
    63  		v7 ^= v11
    64  		v7 = bits.RotateLeft64(v7, -24)
    65  
    66  		v0 += m[s[4]]
    67  		v0 += v4
    68  		v12 ^= v0
    69  		v12 = bits.RotateLeft64(v12, -16)
    70  		v8 += v12
    71  		v4 ^= v8
    72  		v4 = bits.RotateLeft64(v4, -63)
    73  		v1 += m[s[5]]
    74  		v1 += v5
    75  		v13 ^= v1
    76  		v13 = bits.RotateLeft64(v13, -16)
    77  		v9 += v13
    78  		v5 ^= v9
    79  		v5 = bits.RotateLeft64(v5, -63)
    80  		v2 += m[s[6]]
    81  		v2 += v6
    82  		v14 ^= v2
    83  		v14 = bits.RotateLeft64(v14, -16)
    84  		v10 += v14
    85  		v6 ^= v10
    86  		v6 = bits.RotateLeft64(v6, -63)
    87  		v3 += m[s[7]]
    88  		v3 += v7
    89  		v15 ^= v3
    90  		v15 = bits.RotateLeft64(v15, -16)
    91  		v11 += v15
    92  		v7 ^= v11
    93  		v7 = bits.RotateLeft64(v7, -63)
    94  
    95  		v0 += m[s[8]]
    96  		v0 += v5
    97  		v15 ^= v0
    98  		v15 = bits.RotateLeft64(v15, -32)
    99  		v10 += v15
   100  		v5 ^= v10
   101  		v5 = bits.RotateLeft64(v5, -24)
   102  		v1 += m[s[9]]
   103  		v1 += v6
   104  		v12 ^= v1
   105  		v12 = bits.RotateLeft64(v12, -32)
   106  		v11 += v12
   107  		v6 ^= v11
   108  		v6 = bits.RotateLeft64(v6, -24)
   109  		v2 += m[s[10]]
   110  		v2 += v7
   111  		v13 ^= v2
   112  		v13 = bits.RotateLeft64(v13, -32)
   113  		v8 += v13
   114  		v7 ^= v8
   115  		v7 = bits.RotateLeft64(v7, -24)
   116  		v3 += m[s[11]]
   117  		v3 += v4
   118  		v14 ^= v3
   119  		v14 = bits.RotateLeft64(v14, -32)
   120  		v9 += v14
   121  		v4 ^= v9
   122  		v4 = bits.RotateLeft64(v4, -24)
   123  
   124  		v0 += m[s[12]]
   125  		v0 += v5
   126  		v15 ^= v0
   127  		v15 = bits.RotateLeft64(v15, -16)
   128  		v10 += v15
   129  		v5 ^= v10
   130  		v5 = bits.RotateLeft64(v5, -63)
   131  		v1 += m[s[13]]
   132  		v1 += v6
   133  		v12 ^= v1
   134  		v12 = bits.RotateLeft64(v12, -16)
   135  		v11 += v12
   136  		v6 ^= v11
   137  		v6 = bits.RotateLeft64(v6, -63)
   138  		v2 += m[s[14]]
   139  		v2 += v7
   140  		v13 ^= v2
   141  		v13 = bits.RotateLeft64(v13, -16)
   142  		v8 += v13
   143  		v7 ^= v8
   144  		v7 = bits.RotateLeft64(v7, -63)
   145  		v3 += m[s[15]]
   146  		v3 += v4
   147  		v14 ^= v3
   148  		v14 = bits.RotateLeft64(v14, -16)
   149  		v9 += v14
   150  		v4 ^= v9
   151  		v4 = bits.RotateLeft64(v4, -63)
   152  	}
   153  	h[0] ^= v0 ^ v8
   154  	h[1] ^= v1 ^ v9
   155  	h[2] ^= v2 ^ v10
   156  	h[3] ^= v3 ^ v11
   157  	h[4] ^= v4 ^ v12
   158  	h[5] ^= v5 ^ v13
   159  	h[6] ^= v6 ^ v14
   160  	h[7] ^= v7 ^ v15
   161  }