aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/go/_std_1.22/src/crypto/des/const.go
blob: a20879d57412da256a0bc737a484ba7488ee498a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package des implements the Data Encryption Standard (DES) and the
// Triple Data Encryption Algorithm (TDEA) as defined
// in U.S. Federal Information Processing Standards Publication 46-3.
//
// DES is cryptographically broken and should not be used for secure
// applications.
package des

// Used to perform an initial permutation of a 64-bit input block.
var initialPermutation = [64]byte{
	6, 14, 22, 30, 38, 46, 54, 62,
	4, 12, 20, 28, 36, 44, 52, 60,
	2, 10, 18, 26, 34, 42, 50, 58,
	0, 8, 16, 24, 32, 40, 48, 56,
	7, 15, 23, 31, 39, 47, 55, 63,
	5, 13, 21, 29, 37, 45, 53, 61,
	3, 11, 19, 27, 35, 43, 51, 59,
	1, 9, 17, 25, 33, 41, 49, 57,
}

// Used to perform a final permutation of a 4-bit preoutput block. This is the
// inverse of initialPermutation
var finalPermutation = [64]byte{
	24, 56, 16, 48, 8, 40, 0, 32,
	25, 57, 17, 49, 9, 41, 1, 33,
	26, 58, 18, 50, 10, 42, 2, 34,
	27, 59, 19, 51, 11, 43, 3, 35,
	28, 60, 20, 52, 12, 44, 4, 36,
	29, 61, 21, 53, 13, 45, 5, 37,
	30, 62, 22, 54, 14, 46, 6, 38,
	31, 63, 23, 55, 15, 47, 7, 39,
}

// Used to expand an input block of 32 bits, producing an output block of 48
// bits.
var expansionFunction = [48]byte{
	0, 31, 30, 29, 28, 27, 28, 27,
	26, 25, 24, 23, 24, 23, 22, 21,
	20, 19, 20, 19, 18, 17, 16, 15,
	16, 15, 14, 13, 12, 11, 12, 11,
	10, 9, 8, 7, 8, 7, 6, 5,
	4, 3, 4, 3, 2, 1, 0, 31,
}

// Yields a 32-bit output from a 32-bit input
var permutationFunction = [32]byte{
	16, 25, 12, 11, 3, 20, 4, 15,
	31, 17, 9, 6, 27, 14, 1, 22,
	30, 24, 8, 18, 0, 5, 29, 23,
	13, 19, 2, 26, 10, 21, 28, 7,
}

// Used in the key schedule to select 56 bits
// from a 64-bit input.
var permutedChoice1 = [56]byte{
	7, 15, 23, 31, 39, 47, 55, 63,
	6, 14, 22, 30, 38, 46, 54, 62,
	5, 13, 21, 29, 37, 45, 53, 61,
	4, 12, 20, 28, 1, 9, 17, 25,
	33, 41, 49, 57, 2, 10, 18, 26,
	34, 42, 50, 58, 3, 11, 19, 27,
	35, 43, 51, 59, 36, 44, 52, 60,
}

// Used in the key schedule to produce each subkey by selecting 48 bits from
// the 56-bit input
var permutedChoice2 = [48]byte{
	42, 39, 45, 32, 55, 51, 53, 28,
	41, 50, 35, 46, 33, 37, 44, 52,
	30, 48, 40, 49, 29, 36, 43, 54,
	15, 4, 25, 19, 9, 1, 26, 16,
	5, 11, 23, 8, 12, 7, 17, 0,
	22, 3, 10, 14, 6, 20, 27, 24,
}

// 8 S-boxes composed of 4 rows and 16 columns
// Used in the DES cipher function
var sBoxes = [8][4][16]uint8{
	// S-box 1
	{
		{14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7},
		{0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8},
		{4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0},
		{15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13},
	},
	// S-box 2
	{
		{15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10},
		{3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5},
		{0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15},
		{13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9},
	},
	// S-box 3
	{
		{10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8},
		{13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1},
		{13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7},
		{1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12},
	},
	// S-box 4
	{
		{7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15},
		{13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9},
		{10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4},
		{3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14},
	},
	// S-box 5
	{
		{2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9},
		{14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6},
		{4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14},
		{11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3},
	},
	// S-box 6
	{
		{12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11},
		{10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8},
		{9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6},
		{4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13},
	},
	// S-box 7
	{
		{4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1},
		{13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6},
		{1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2},
		{6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12},
	},
	// S-box 8
	{
		{13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7},
		{1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2},
		{7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8},
		{2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11},
	},
}

// Size of left rotation per round in each half of the key schedule
var ksRotations = [16]uint8{1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1}