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
|
/*
* GOST 28147-89
* (C) 1999-2009,2011 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/gost_28147.h>
#include <botan/exceptn.h>
#include <botan/internal/loadstor.h>
#include <botan/internal/rotate.h>
namespace Botan {
uint8_t GOST_28147_89_Params::sbox_entry(size_t row, size_t col) const
{
const uint8_t x = m_sboxes[4 * col + (row / 2)];
return (row % 2 == 0) ? (x >> 4) : (x & 0x0F);
}
uint8_t GOST_28147_89_Params::sbox_pair(size_t row, size_t col) const
{
const uint8_t x = m_sboxes[4 * (col % 16) + row];
const uint8_t y = m_sboxes[4 * (col / 16) + row];
return (x >> 4) | (y << 4);
}
GOST_28147_89_Params::GOST_28147_89_Params(const std::string& n) : m_name(n)
{
// Encoded in the packed fromat from RFC 4357
// GostR3411_94_TestParamSet (OID 1.2.643.2.2.31.0)
static const uint8_t GOST_R_3411_TEST_PARAMS[64] = {
0x4E, 0x57, 0x64, 0xD1, 0xAB, 0x8D, 0xCB, 0xBF, 0x94, 0x1A, 0x7A,
0x4D, 0x2C, 0xD1, 0x10, 0x10, 0xD6, 0xA0, 0x57, 0x35, 0x8D, 0x38,
0xF2, 0xF7, 0x0F, 0x49, 0xD1, 0x5A, 0xEA, 0x2F, 0x8D, 0x94, 0x62,
0xEE, 0x43, 0x09, 0xB3, 0xF4, 0xA6, 0xA2, 0x18, 0xC6, 0x98, 0xE3,
0xC1, 0x7C, 0xE5, 0x7E, 0x70, 0x6B, 0x09, 0x66, 0xF7, 0x02, 0x3C,
0x8B, 0x55, 0x95, 0xBF, 0x28, 0x39, 0xB3, 0x2E, 0xCC };
// GostR3411-94-CryptoProParamSet (OID 1.2.643.2.2.31.1)
static const uint8_t GOST_R_3411_CRYPTOPRO_PARAMS[64] = {
0xA5, 0x74, 0x77, 0xD1, 0x4F, 0xFA, 0x66, 0xE3, 0x54, 0xC7, 0x42,
0x4A, 0x60, 0xEC, 0xB4, 0x19, 0x82, 0x90, 0x9D, 0x75, 0x1D, 0x4F,
0xC9, 0x0B, 0x3B, 0x12, 0x2F, 0x54, 0x79, 0x08, 0xA0, 0xAF, 0xD1,
0x3E, 0x1A, 0x38, 0xC7, 0xB1, 0x81, 0xC6, 0xE6, 0x56, 0x05, 0x87,
0x03, 0x25, 0xEB, 0xFE, 0x9C, 0x6D, 0xF8, 0x6D, 0x2E, 0xAB, 0xDE,
0x20, 0xBA, 0x89, 0x3C, 0x92, 0xF8, 0xD3, 0x53, 0xBC };
if(m_name == "R3411_94_TestParam")
m_sboxes = GOST_R_3411_TEST_PARAMS;
else if(m_name == "R3411_CryptoPro")
m_sboxes = GOST_R_3411_CRYPTOPRO_PARAMS;
else
throw Invalid_Argument("GOST_28147_89_Params: Unknown " + m_name);
}
/*
* GOST Constructor
*/
GOST_28147_89::GOST_28147_89(const GOST_28147_89_Params& param) :
m_SBOX(1024),
m_name("GOST-28147-89(" + param.param_name() + ")")
{
// Convert the parallel 4x4 sboxes into larger word-based sboxes
for(size_t i = 0; i != 256; ++i)
{
m_SBOX[i ] = rotl<11, uint32_t>(param.sbox_pair(0, i));
m_SBOX[i+256] = rotl<19, uint32_t>(param.sbox_pair(1, i));
m_SBOX[i+512] = rotl<27, uint32_t>(param.sbox_pair(2, i));
m_SBOX[i+768] = rotl< 3, uint32_t>(param.sbox_pair(3, i));
}
}
std::string GOST_28147_89::name() const
{
return m_name;
}
namespace {
/*
* Two rounds of GOST
*/
template<size_t R1, size_t R2>
void GOST_ROUND2(uint32_t& N1, uint32_t& N2,
const std::vector<uint32_t>& S,
const secure_vector<uint32_t>& EK)
{
const uint32_t T0 = N1 + EK[R1];
N2 ^= S[get_byte<3>(T0)] |
S[get_byte<2>(T0)+256] |
S[get_byte<1>(T0)+512] |
S[get_byte<0>(T0)+768];
const uint32_t T1 = N2 + EK[R2];
N1 ^= S[get_byte<3>(T1)] |
S[get_byte<2>(T1)+256] |
S[get_byte<1>(T1)+512] |
S[get_byte<0>(T1)+768];
}
}
/*
* GOST Encryption
*/
void GOST_28147_89::encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const
{
verify_key_set(m_EK.empty() == false);
for(size_t i = 0; i != blocks; ++i)
{
uint32_t N1 = load_le<uint32_t>(in, 0);
uint32_t N2 = load_le<uint32_t>(in, 1);
for(size_t j = 0; j != 3; ++j)
{
GOST_ROUND2<0, 1>(N1, N2, m_SBOX, m_EK);
GOST_ROUND2<2, 3>(N1, N2, m_SBOX, m_EK);
GOST_ROUND2<4, 5>(N1, N2, m_SBOX, m_EK);
GOST_ROUND2<6, 7>(N1, N2, m_SBOX, m_EK);
}
GOST_ROUND2<7, 6>(N1, N2, m_SBOX, m_EK);
GOST_ROUND2<5, 4>(N1, N2, m_SBOX, m_EK);
GOST_ROUND2<3, 2>(N1, N2, m_SBOX, m_EK);
GOST_ROUND2<1, 0>(N1, N2, m_SBOX, m_EK);
store_le(out, N2, N1);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/*
* GOST Decryption
*/
void GOST_28147_89::decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const
{
verify_key_set(m_EK.empty() == false);
for(size_t i = 0; i != blocks; ++i)
{
uint32_t N1 = load_le<uint32_t>(in, 0);
uint32_t N2 = load_le<uint32_t>(in, 1);
GOST_ROUND2<0, 1>(N1, N2, m_SBOX, m_EK);
GOST_ROUND2<2, 3>(N1, N2, m_SBOX, m_EK);
GOST_ROUND2<4, 5>(N1, N2, m_SBOX, m_EK);
GOST_ROUND2<6, 7>(N1, N2, m_SBOX, m_EK);
for(size_t j = 0; j != 3; ++j)
{
GOST_ROUND2<7, 6>(N1, N2, m_SBOX, m_EK);
GOST_ROUND2<5, 4>(N1, N2, m_SBOX, m_EK);
GOST_ROUND2<3, 2>(N1, N2, m_SBOX, m_EK);
GOST_ROUND2<1, 0>(N1, N2, m_SBOX, m_EK);
}
store_le(out, N2, N1);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/*
* GOST Key Schedule
*/
void GOST_28147_89::key_schedule(const uint8_t key[], size_t /*length*/)
{
m_EK.resize(8);
for(size_t i = 0; i != 8; ++i)
m_EK[i] = load_le<uint32_t>(key, i);
}
void GOST_28147_89::clear()
{
zap(m_EK);
}
}
|
