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
|
/*
* Tiger
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/tiger.h>
#include <botan/exceptn.h>
#include <botan/parsing.h>
namespace Botan {
namespace {
/*
* Tiger Mixing Function
*/
inline void mix(secure_vector<u64bit>& X)
{
X[0] -= X[7] ^ 0xA5A5A5A5A5A5A5A5;
X[1] ^= X[0];
X[2] += X[1];
X[3] -= X[2] ^ ((~X[1]) << 19);
X[4] ^= X[3];
X[5] += X[4];
X[6] -= X[5] ^ ((~X[4]) >> 23);
X[7] ^= X[6];
X[0] += X[7];
X[1] -= X[0] ^ ((~X[7]) << 19);
X[2] ^= X[1];
X[3] += X[2];
X[4] -= X[3] ^ ((~X[2]) >> 23);
X[5] ^= X[4];
X[6] += X[5];
X[7] -= X[6] ^ 0x0123456789ABCDEF;
}
}
/*
* Tiger Compression Function
*/
void Tiger::compress_n(const byte input[], size_t blocks)
{
u64bit A = digest[0], B = digest[1], C = digest[2];
for(size_t i = 0; i != blocks; ++i)
{
load_le(X.data(), input, X.size());
pass(A, B, C, X, 5); mix(X);
pass(C, A, B, X, 7); mix(X);
pass(B, C, A, X, 9);
for(size_t j = 3; j != passes; ++j)
{
mix(X);
pass(A, B, C, X, 9);
u64bit T = A; A = C; C = B; B = T;
}
A = (digest[0] ^= A);
B = digest[1] = B - digest[1];
C = (digest[2] += C);
input += hash_block_size();
}
}
/*
* Copy out the digest
*/
void Tiger::copy_out(byte output[])
{
copy_out_vec_le(output, output_length(), digest);
}
/*
* Tiger Pass
*/
void Tiger::pass(u64bit& A, u64bit& B, u64bit& C,
const secure_vector<u64bit>& X,
byte mul)
{
C ^= X[0];
A -= SBOX1[get_byte(7, C)] ^ SBOX2[get_byte(5, C)] ^
SBOX3[get_byte(3, C)] ^ SBOX4[get_byte(1, C)];
B += SBOX1[get_byte(0, C)] ^ SBOX2[get_byte(2, C)] ^
SBOX3[get_byte(4, C)] ^ SBOX4[get_byte(6, C)];
B *= mul;
A ^= X[1];
B -= SBOX1[get_byte(7, A)] ^ SBOX2[get_byte(5, A)] ^
SBOX3[get_byte(3, A)] ^ SBOX4[get_byte(1, A)];
C += SBOX1[get_byte(0, A)] ^ SBOX2[get_byte(2, A)] ^
SBOX3[get_byte(4, A)] ^ SBOX4[get_byte(6, A)];
C *= mul;
B ^= X[2];
C -= SBOX1[get_byte(7, B)] ^ SBOX2[get_byte(5, B)] ^
SBOX3[get_byte(3, B)] ^ SBOX4[get_byte(1, B)];
A += SBOX1[get_byte(0, B)] ^ SBOX2[get_byte(2, B)] ^
SBOX3[get_byte(4, B)] ^ SBOX4[get_byte(6, B)];
A *= mul;
C ^= X[3];
A -= SBOX1[get_byte(7, C)] ^ SBOX2[get_byte(5, C)] ^
SBOX3[get_byte(3, C)] ^ SBOX4[get_byte(1, C)];
B += SBOX1[get_byte(0, C)] ^ SBOX2[get_byte(2, C)] ^
SBOX3[get_byte(4, C)] ^ SBOX4[get_byte(6, C)];
B *= mul;
A ^= X[4];
B -= SBOX1[get_byte(7, A)] ^ SBOX2[get_byte(5, A)] ^
SBOX3[get_byte(3, A)] ^ SBOX4[get_byte(1, A)];
C += SBOX1[get_byte(0, A)] ^ SBOX2[get_byte(2, A)] ^
SBOX3[get_byte(4, A)] ^ SBOX4[get_byte(6, A)];
C *= mul;
B ^= X[5];
C -= SBOX1[get_byte(7, B)] ^ SBOX2[get_byte(5, B)] ^
SBOX3[get_byte(3, B)] ^ SBOX4[get_byte(1, B)];
A += SBOX1[get_byte(0, B)] ^ SBOX2[get_byte(2, B)] ^
SBOX3[get_byte(4, B)] ^ SBOX4[get_byte(6, B)];
A *= mul;
C ^= X[6];
A -= SBOX1[get_byte(7, C)] ^ SBOX2[get_byte(5, C)] ^
SBOX3[get_byte(3, C)] ^ SBOX4[get_byte(1, C)];
B += SBOX1[get_byte(0, C)] ^ SBOX2[get_byte(2, C)] ^
SBOX3[get_byte(4, C)] ^ SBOX4[get_byte(6, C)];
B *= mul;
A ^= X[7];
B -= SBOX1[get_byte(7, A)] ^ SBOX2[get_byte(5, A)] ^
SBOX3[get_byte(3, A)] ^ SBOX4[get_byte(1, A)];
C += SBOX1[get_byte(0, A)] ^ SBOX2[get_byte(2, A)] ^
SBOX3[get_byte(4, A)] ^ SBOX4[get_byte(6, A)];
C *= mul;
}
/*
* Clear memory of sensitive data
*/
void Tiger::clear()
{
MDx_HashFunction::clear();
zeroise(X);
digest[0] = 0x0123456789ABCDEF;
digest[1] = 0xFEDCBA9876543210;
digest[2] = 0xF096A5B4C3B2E187;
}
/*
* Return the name of this type
*/
std::string Tiger::name() const
{
return "Tiger(" + std::to_string(output_length()) + "," +
std::to_string(passes) + ")";
}
/*
* Tiger Constructor
*/
Tiger::Tiger(size_t hash_len, size_t passes) :
MDx_HashFunction(64, false, false),
X(8),
digest(3),
hash_len(hash_len),
passes(passes)
{
if(output_length() != 16 && output_length() != 20 && output_length() != 24)
throw Invalid_Argument("Tiger: Illegal hash output size: " +
std::to_string(output_length()));
if(passes < 3)
throw Invalid_Argument("Tiger: Invalid number of passes: "
+ std::to_string(passes));
clear();
}
}
|
