github.com/devops-filetransfer/sshego@v7.0.4+incompatible/_vendor/golang.org/x/crypto/blake2s/blake2s_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 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  }