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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/*
* Threefish-512
* (C) 2013,2014 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/threefish.h>
#include <botan/loadstor.h>
namespace Botan {
#define THREEFISH_ROUND(X0,X1,X2,X3,X4,X5,X6,X7,ROT1,ROT2,ROT3,ROT4) \
do { \
X0 += X4; \
X1 += X5; \
X2 += X6; \
X3 += X7; \
X4 = rotate_left(X4, ROT1); \
X5 = rotate_left(X5, ROT2); \
X6 = rotate_left(X6, ROT3); \
X7 = rotate_left(X7, ROT4); \
X4 ^= X0; \
X5 ^= X1; \
X6 ^= X2; \
X7 ^= X3; \
} while(0)
#define THREEFISH_INJECT_KEY(r) \
do { \
X0 += m_K[(r ) % 9]; \
X1 += m_K[(r+1) % 9]; \
X2 += m_K[(r+2) % 9]; \
X3 += m_K[(r+3) % 9]; \
X4 += m_K[(r+4) % 9]; \
X5 += m_K[(r+5) % 9] + m_T[(r ) % 3]; \
X6 += m_K[(r+6) % 9] + m_T[(r+1) % 3]; \
X7 += m_K[(r+7) % 9] + (r); \
} while(0)
#define THREEFISH_ENC_8_ROUNDS(R1,R2) \
do { \
THREEFISH_ROUND(X0,X2,X4,X6, X1,X3,X5,X7, 46,36,19,37); \
THREEFISH_ROUND(X2,X4,X6,X0, X1,X7,X5,X3, 33,27,14,42); \
THREEFISH_ROUND(X4,X6,X0,X2, X1,X3,X5,X7, 17,49,36,39); \
THREEFISH_ROUND(X6,X0,X2,X4, X1,X7,X5,X3, 44, 9,54,56); \
THREEFISH_INJECT_KEY(R1); \
\
THREEFISH_ROUND(X0,X2,X4,X6, X1,X3,X5,X7, 39,30,34,24); \
THREEFISH_ROUND(X2,X4,X6,X0, X1,X7,X5,X3, 13,50,10,17); \
THREEFISH_ROUND(X4,X6,X0,X2, X1,X3,X5,X7, 25,29,39,43); \
THREEFISH_ROUND(X6,X0,X2,X4, X1,X7,X5,X3, 8,35,56,22); \
THREEFISH_INJECT_KEY(R2); \
} while(0)
void Threefish_512::skein_feedfwd(const secure_vector<u64bit>& M,
const secure_vector<u64bit>& T)
{
BOTAN_ASSERT(m_K.size() == 9, "Key was set");
BOTAN_ASSERT(M.size() == 8, "Single block");
m_T[0] = T[0];
m_T[1] = T[1];
m_T[2] = T[0] ^ T[1];
u64bit X0 = M[0];
u64bit X1 = M[1];
u64bit X2 = M[2];
u64bit X3 = M[3];
u64bit X4 = M[4];
u64bit X5 = M[5];
u64bit X6 = M[6];
u64bit X7 = M[7];
THREEFISH_INJECT_KEY(0);
THREEFISH_ENC_8_ROUNDS(1,2);
THREEFISH_ENC_8_ROUNDS(3,4);
THREEFISH_ENC_8_ROUNDS(5,6);
THREEFISH_ENC_8_ROUNDS(7,8);
THREEFISH_ENC_8_ROUNDS(9,10);
THREEFISH_ENC_8_ROUNDS(11,12);
THREEFISH_ENC_8_ROUNDS(13,14);
THREEFISH_ENC_8_ROUNDS(15,16);
THREEFISH_ENC_8_ROUNDS(17,18);
m_K[0] = M[0] ^ X0;
m_K[1] = M[1] ^ X1;
m_K[2] = M[2] ^ X2;
m_K[3] = M[3] ^ X3;
m_K[4] = M[4] ^ X4;
m_K[5] = M[5] ^ X5;
m_K[6] = M[6] ^ X6;
m_K[7] = M[7] ^ X7;
m_K[8] = m_K[0] ^ m_K[1] ^ m_K[2] ^ m_K[3] ^
m_K[4] ^ m_K[5] ^ m_K[6] ^ m_K[7] ^ 0x1BD11BDAA9FC1A22;
}
void Threefish_512::encrypt_n(const byte in[], byte out[], size_t blocks) const
{
BOTAN_ASSERT(m_K.size() == 9, "Key was set");
BOTAN_ASSERT(m_T.size() == 3, "Tweak was set");
for(size_t i = 0; i != blocks; ++i)
{
u64bit X0 = load_le<u64bit>(in, 0);
u64bit X1 = load_le<u64bit>(in, 1);
u64bit X2 = load_le<u64bit>(in, 2);
u64bit X3 = load_le<u64bit>(in, 3);
u64bit X4 = load_le<u64bit>(in, 4);
u64bit X5 = load_le<u64bit>(in, 5);
u64bit X6 = load_le<u64bit>(in, 6);
u64bit X7 = load_le<u64bit>(in, 7);
THREEFISH_INJECT_KEY(0);
THREEFISH_ENC_8_ROUNDS(1,2);
THREEFISH_ENC_8_ROUNDS(3,4);
THREEFISH_ENC_8_ROUNDS(5,6);
THREEFISH_ENC_8_ROUNDS(7,8);
THREEFISH_ENC_8_ROUNDS(9,10);
THREEFISH_ENC_8_ROUNDS(11,12);
THREEFISH_ENC_8_ROUNDS(13,14);
THREEFISH_ENC_8_ROUNDS(15,16);
THREEFISH_ENC_8_ROUNDS(17,18);
store_le(out, X0, X1, X2, X3, X4, X5, X6, X7);
in += 64;
out += 64;
}
}
#undef THREEFISH_ENC_8_ROUNDS
#undef THREEFISH_INJECT_KEY
#undef THREEFISH_ROUND
void Threefish_512::decrypt_n(const byte in[], byte out[], size_t blocks) const
{
BOTAN_ASSERT(m_K.size() == 9, "Key was set");
BOTAN_ASSERT(m_T.size() == 3, "Tweak was set");
#define THREEFISH_ROUND(X0,X1,X2,X3,X4,X5,X6,X7,ROT1,ROT2,ROT3,ROT4) \
do { \
X4 ^= X0; \
X5 ^= X1; \
X6 ^= X2; \
X7 ^= X3; \
X4 = rotate_right(X4, ROT1); \
X5 = rotate_right(X5, ROT2); \
X6 = rotate_right(X6, ROT3); \
X7 = rotate_right(X7, ROT4); \
X0 -= X4; \
X1 -= X5; \
X2 -= X6; \
X3 -= X7; \
} while(0)
#define THREEFISH_INJECT_KEY(r) \
do { \
X0 -= m_K[(r ) % 9]; \
X1 -= m_K[(r+1) % 9]; \
X2 -= m_K[(r+2) % 9]; \
X3 -= m_K[(r+3) % 9]; \
X4 -= m_K[(r+4) % 9]; \
X5 -= m_K[(r+5) % 9] + m_T[(r ) % 3]; \
X6 -= m_K[(r+6) % 9] + m_T[(r+1) % 3]; \
X7 -= m_K[(r+7) % 9] + (r); \
} while(0)
#define THREEFISH_DEC_8_ROUNDS(R1,R2) \
do { \
THREEFISH_ROUND(X6,X0,X2,X4, X1,X7,X5,X3, 8,35,56,22); \
THREEFISH_ROUND(X4,X6,X0,X2, X1,X3,X5,X7, 25,29,39,43); \
THREEFISH_ROUND(X2,X4,X6,X0, X1,X7,X5,X3, 13,50,10,17); \
THREEFISH_ROUND(X0,X2,X4,X6, X1,X3,X5,X7, 39,30,34,24); \
THREEFISH_INJECT_KEY(R1); \
\
THREEFISH_ROUND(X6,X0,X2,X4, X1,X7,X5,X3, 44, 9,54,56); \
THREEFISH_ROUND(X4,X6,X0,X2, X1,X3,X5,X7, 17,49,36,39); \
THREEFISH_ROUND(X2,X4,X6,X0, X1,X7,X5,X3, 33,27,14,42); \
THREEFISH_ROUND(X0,X2,X4,X6, X1,X3,X5,X7, 46,36,19,37); \
THREEFISH_INJECT_KEY(R2); \
} while(0)
for(size_t i = 0; i != blocks; ++i)
{
u64bit X0 = load_le<u64bit>(in, 0);
u64bit X1 = load_le<u64bit>(in, 1);
u64bit X2 = load_le<u64bit>(in, 2);
u64bit X3 = load_le<u64bit>(in, 3);
u64bit X4 = load_le<u64bit>(in, 4);
u64bit X5 = load_le<u64bit>(in, 5);
u64bit X6 = load_le<u64bit>(in, 6);
u64bit X7 = load_le<u64bit>(in, 7);
THREEFISH_INJECT_KEY(18);
THREEFISH_DEC_8_ROUNDS(17,16);
THREEFISH_DEC_8_ROUNDS(15,14);
THREEFISH_DEC_8_ROUNDS(13,12);
THREEFISH_DEC_8_ROUNDS(11,10);
THREEFISH_DEC_8_ROUNDS(9,8);
THREEFISH_DEC_8_ROUNDS(7,6);
THREEFISH_DEC_8_ROUNDS(5,4);
THREEFISH_DEC_8_ROUNDS(3,2);
THREEFISH_DEC_8_ROUNDS(1,0);
store_le(out, X0, X1, X2, X3, X4, X5, X6, X7);
in += 64;
out += 64;
}
#undef THREEFISH_DEC_8_ROUNDS
#undef THREEFISH_INJECT_KEY
#undef THREEFISH_ROUND
}
void Threefish_512::set_tweak(const byte tweak[], size_t len)
{
if(len != 16)
throw Exception("Unsupported twofish tweak length");
m_T.resize(3);
m_T[0] = load_le<u64bit>(tweak, 0);
m_T[1] = load_le<u64bit>(tweak, 1);
m_T[2] = m_T[0] ^ m_T[1];
}
void Threefish_512::key_schedule(const byte key[], size_t)
{
// todo: define key schedule for smaller keys
m_K.resize(9);
for(size_t i = 0; i != 8; ++i)
m_K[i] = load_le<u64bit>(key, i);
m_K[8] = m_K[0] ^ m_K[1] ^ m_K[2] ^ m_K[3] ^
m_K[4] ^ m_K[5] ^ m_K[6] ^ m_K[7] ^ 0x1BD11BDAA9FC1A22;
// Reset tweak to all zeros on key reset
m_T.resize(3);
zeroise(m_T);
}
void Threefish_512::clear()
{
zeroise(m_K);
zeroise(m_T);
}
}
|
