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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/*************************************************
* Serpent Source File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#include <botan/serpent.h>
#include <botan/bit_ops.h>
namespace Botan {
namespace {
/*************************************************
* Serpent Encryption S-Box 1 *
*************************************************/
inline void SBoxE1(u32bit& B0, u32bit& B1, u32bit& B2, u32bit& B3)
{
u32bit T0 = B0, T1 = B1, T2 = B2, T3 = B3, T4;
T3 ^= T0; T4 = T1; T1 &= T3; T4 ^= T2; T1 ^= T0; T0 |= T3; T0 ^= T4;
T4 ^= T3; T3 ^= T2; T2 |= T1; T2 ^= T4; T4 = ~T4; T4 |= T1; T1 ^= T3;
T1 ^= T4; T3 |= T0; T1 ^= T3; T4 ^= T3;
B0 = T1; B1 = T4; B2 = T2; B3 = T0;
}
/*************************************************
* Serpent Encryption S-Box 2 *
*************************************************/
inline void SBoxE2(u32bit& B0, u32bit& B1, u32bit& B2, u32bit& B3)
{
u32bit T0 = B0, T1 = B1, T2 = B2, T3 = B3, T4;
T0 = ~T0; T2 = ~T2; T4 = T0; T0 &= T1; T2 ^= T0; T0 |= T3; T3 ^= T2;
T1 ^= T0; T0 ^= T4; T4 |= T1; T1 ^= T3; T2 |= T0; T2 &= T4; T0 ^= T1;
T1 &= T2; T1 ^= T0; T0 &= T2; T0 ^= T4;
B0 = T2; B1 = T0; B2 = T3; B3 = T1;
}
/*************************************************
* Serpent Encryption S-Box 3 *
*************************************************/
inline void SBoxE3(u32bit& B0, u32bit& B1, u32bit& B2, u32bit& B3)
{
u32bit T0 = B0, T1 = B1, T2 = B2, T3 = B3, T4;
T4 = T0; T0 &= T2; T0 ^= T3; T2 ^= T1; T2 ^= T0; T3 |= T4; T3 ^= T1;
T4 ^= T2; T1 = T3; T3 |= T4; T3 ^= T0; T0 &= T1; T4 ^= T0; T1 ^= T3;
T1 ^= T4; T4 = ~T4;
B0 = T2; B1 = T3; B2 = T1; B3 = T4;
}
/*************************************************
* Serpent Encryption S-Box 4 *
*************************************************/
inline void SBoxE4(u32bit& B0, u32bit& B1, u32bit& B2, u32bit& B3)
{
u32bit T0 = B0, T1 = B1, T2 = B2, T3 = B3, T4;
T4 = T0; T0 |= T3; T3 ^= T1; T1 &= T4; T4 ^= T2; T2 ^= T3; T3 &= T0;
T4 |= T1; T3 ^= T4; T0 ^= T1; T4 &= T0; T1 ^= T3; T4 ^= T2; T1 |= T0;
T1 ^= T2; T0 ^= T3; T2 = T1; T1 |= T3; T1 ^= T0;
B0 = T1; B1 = T2; B2 = T3; B3 = T4;
}
/*************************************************
* Serpent Encryption S-Box 5 *
*************************************************/
inline void SBoxE5(u32bit& B0, u32bit& B1, u32bit& B2, u32bit& B3)
{
u32bit T0 = B0, T1 = B1, T2 = B2, T3 = B3, T4;
T1 ^= T3; T3 = ~T3; T2 ^= T3; T3 ^= T0; T4 = T1; T1 &= T3; T1 ^= T2;
T4 ^= T3; T0 ^= T4; T2 &= T4; T2 ^= T0; T0 &= T1; T3 ^= T0; T4 |= T1;
T4 ^= T0; T0 |= T3; T0 ^= T2; T2 &= T3; T0 = ~T0; T4 ^= T2;
B0 = T1; B1 = T4; B2 = T0; B3 = T3;
}
/*************************************************
* Serpent Encryption S-Box 6 *
*************************************************/
inline void SBoxE6(u32bit& B0, u32bit& B1, u32bit& B2, u32bit& B3)
{
u32bit T0 = B0, T1 = B1, T2 = B2, T3 = B3, T4;
T0 ^= T1; T1 ^= T3; T3 = ~T3; T4 = T1; T1 &= T0; T2 ^= T3; T1 ^= T2;
T2 |= T4; T4 ^= T3; T3 &= T1; T3 ^= T0; T4 ^= T1; T4 ^= T2; T2 ^= T0;
T0 &= T3; T2 = ~T2; T0 ^= T4; T4 |= T3; T2 ^= T4;
B0 = T1; B1 = T3; B2 = T0; B3 = T2;
}
/*************************************************
* Serpent Encryption S-Box 7 *
*************************************************/
inline void SBoxE7(u32bit& B0, u32bit& B1, u32bit& B2, u32bit& B3)
{
u32bit T0 = B0, T1 = B1, T2 = B2, T3 = B3, T4;
T2 = ~T2; T4 = T3; T3 &= T0; T0 ^= T4; T3 ^= T2; T2 |= T4; T1 ^= T3;
T2 ^= T0; T0 |= T1; T2 ^= T1; T4 ^= T0; T0 |= T3; T0 ^= T2; T4 ^= T3;
T4 ^= T0; T3 = ~T3; T2 &= T4; T2 ^= T3;
B0 = T0; B1 = T1; B2 = T4; B3 = T2;
}
/*************************************************
* Serpent Encryption S-Box 8 *
*************************************************/
inline void SBoxE8(u32bit& B0, u32bit& B1, u32bit& B2, u32bit& B3)
{
u32bit T0 = B0, T1 = B1, T2 = B2, T3 = B3, T4;
T4 = T1; T1 |= T2; T1 ^= T3; T4 ^= T2; T2 ^= T1; T3 |= T4; T3 &= T0;
T4 ^= T2; T3 ^= T1; T1 |= T4; T1 ^= T0; T0 |= T4; T0 ^= T2; T1 ^= T4;
T2 ^= T1; T1 &= T0; T1 ^= T4; T2 = ~T2; T2 |= T0; T4 ^= T2;
B0 = T4; B1 = T3; B2 = T1; B3 = T0;
}
}
extern "C" void serpent_encrypt(const byte[16], byte[16], const u32bit[132]);
extern "C" void serpent_decrypt(const byte[16], byte[16], const u32bit[132]);
/*************************************************
* Serpent Encryption *
*************************************************/
void Serpent::enc(const byte in[], byte out[]) const
{
serpent_encrypt(in, out, round_key);
}
/*************************************************
* Serpent Decryption *
*************************************************/
void Serpent::dec(const byte in[], byte out[]) const
{
serpent_decrypt(in, out, round_key);
}
/*************************************************
* Serpent Key Schedule *
*************************************************/
void Serpent::key(const byte key[], u32bit length)
{
const u32bit PHI = 0x9E3779B9;
SecureBuffer<u32bit, 140> W;
for(u32bit j = 0; j != length / 4; ++j)
W[j] = make_u32bit(key[4*j+3], key[4*j+2], key[4*j+1], key[4*j]);
W[length / 4] |= u32bit(1) << ((length%4)*8);
for(u32bit j = 8; j != 140; ++j)
W[j] = rotate_left(W[j-8] ^ W[j-5] ^ W[j-3] ^ W[j-1] ^ PHI ^ (j-8), 11);
SBoxE4(W[ 8],W[ 9],W[ 10],W[ 11]); SBoxE3(W[ 12],W[ 13],W[ 14],W[ 15]);
SBoxE2(W[ 16],W[ 17],W[ 18],W[ 19]); SBoxE1(W[ 20],W[ 21],W[ 22],W[ 23]);
SBoxE8(W[ 24],W[ 25],W[ 26],W[ 27]); SBoxE7(W[ 28],W[ 29],W[ 30],W[ 31]);
SBoxE6(W[ 32],W[ 33],W[ 34],W[ 35]); SBoxE5(W[ 36],W[ 37],W[ 38],W[ 39]);
SBoxE4(W[ 40],W[ 41],W[ 42],W[ 43]); SBoxE3(W[ 44],W[ 45],W[ 46],W[ 47]);
SBoxE2(W[ 48],W[ 49],W[ 50],W[ 51]); SBoxE1(W[ 52],W[ 53],W[ 54],W[ 55]);
SBoxE8(W[ 56],W[ 57],W[ 58],W[ 59]); SBoxE7(W[ 60],W[ 61],W[ 62],W[ 63]);
SBoxE6(W[ 64],W[ 65],W[ 66],W[ 67]); SBoxE5(W[ 68],W[ 69],W[ 70],W[ 71]);
SBoxE4(W[ 72],W[ 73],W[ 74],W[ 75]); SBoxE3(W[ 76],W[ 77],W[ 78],W[ 79]);
SBoxE2(W[ 80],W[ 81],W[ 82],W[ 83]); SBoxE1(W[ 84],W[ 85],W[ 86],W[ 87]);
SBoxE8(W[ 88],W[ 89],W[ 90],W[ 91]); SBoxE7(W[ 92],W[ 93],W[ 94],W[ 95]);
SBoxE6(W[ 96],W[ 97],W[ 98],W[ 99]); SBoxE5(W[100],W[101],W[102],W[103]);
SBoxE4(W[104],W[105],W[106],W[107]); SBoxE3(W[108],W[109],W[110],W[111]);
SBoxE2(W[112],W[113],W[114],W[115]); SBoxE1(W[116],W[117],W[118],W[119]);
SBoxE8(W[120],W[121],W[122],W[123]); SBoxE7(W[124],W[125],W[126],W[127]);
SBoxE6(W[128],W[129],W[130],W[131]); SBoxE5(W[132],W[133],W[134],W[135]);
SBoxE4(W[136],W[137],W[138],W[139]);
round_key.copy(W + 8, 132);
}
}
|
