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
|
namespace Org.BouncyCastle.Pqc.Crypto.Cmce
{
class Benes13
: Benes
{
public Benes13(int n, int t, int m)
: base(n, t, m)
{
}
/* middle layers of the benes network */
static void LayerIn(ulong[] data, ulong[] bits, int lgs)
{
int i, j, s;
int bit_ptr = 0;
ulong d;
s = 1 << lgs;
for (i = 0; i < 64; i += s * 2)
{
for (j = i; j < i + s; j++)
{
d = (data[j + 0] ^ data[j + s]);
d &= bits[bit_ptr++];
data[j + 0] ^= d;
data[j + s] ^= d;
d = (data[64 + j + 0] ^ data[64 + j + s]);
d &= bits[bit_ptr++];
data[64 + j + 0] ^= d;
data[64 + j + s] ^= d;
}
}
}
/* first and last layers of the benes network */
static void LayerEx(ulong[] data, ulong[] bits, int lgs)
{
int i, j, s;
int bit_ptr = 0;
ulong d;
s = 1 << lgs;
for (i = 0; i < 128; i += s * 2)
{
for (j = i; j < i + s; j++)
{
d = (data[j + 0] ^ data[j + s]);
d &= bits[bit_ptr++];
data[j + 0] ^= d;
data[j + s] ^= d;
}
}
}
/* input: r, sequence of bits to be permuted */
/* bits, condition bits of the Benes network */
/* rev, 0 for normal application; !0 for inverse */
/* output: r, permuted bits */
void ApplyBenes(byte[] r, byte[] bits, int rev)
{
int i, iter, inc;
int r_ptr = 0;
int bits_ptr = 0;
ulong[] r_int_v = new ulong[128];
ulong[] r_int_h = new ulong[128];
ulong[] b_int_v = new ulong[64];
ulong[] b_int_h = new ulong[64];
//
if (rev == 0)
{
bits_ptr = SYS_T * 2 + 40;
inc = 0;
}
else
{
bits_ptr = SYS_T * 2 + 40 + 12288;
inc = -1024;
}
for (i = 0; i < 64; i++) //TODO use load8
{
r_int_v[i + 0] = Utils.Load8(r, r_ptr + i * 16 + 0);
r_int_v[i + 64] = Utils.Load8(r, r_ptr + i * 16 + 8);
}
Transpose64x64(r_int_h, r_int_v, 0);
Transpose64x64(r_int_h, r_int_v, 64);
for (iter = 0; iter <= 6; iter++)
{
for (i = 0; i < 64; i++) //TODO use load8
{
b_int_v[i] = Utils.Load8(bits, bits_ptr);
bits_ptr += 8;
}
bits_ptr += inc;
Transpose64x64(b_int_h, b_int_v);
LayerEx(r_int_h, b_int_h, iter);
}
Transpose64x64(r_int_v, r_int_h, 0);
Transpose64x64(r_int_v, r_int_h, 64);
for (iter = 0; iter <= 5; iter++)
{
for (i = 0; i < 64; i++) //TODO use load8
{
b_int_v[i] = Utils.Load8(bits, bits_ptr);
bits_ptr += 8;
}
bits_ptr += inc;
LayerIn(r_int_v, b_int_v, iter);
}
for (iter = 4; iter >= 0; iter--)
{
for (i = 0; i < 64; i++) //TODO use load8
{
b_int_v[i] = Utils.Load8(bits, bits_ptr);
bits_ptr += 8;
}
bits_ptr += inc;
LayerIn(r_int_v, b_int_v, iter);
}
Transpose64x64(r_int_h, r_int_v, 0);
Transpose64x64(r_int_h, r_int_v, 64);
for (iter = 6; iter >= 0; iter--)
{
for (i = 0; i < 64; i++) //TODO use load8
{
b_int_v[i] = Utils.Load8(bits, bits_ptr);
bits_ptr += 8;
}
bits_ptr += inc;
Transpose64x64(b_int_h, b_int_v);
LayerEx(r_int_h, b_int_h, iter);
}
Transpose64x64(r_int_v, r_int_h, 0);
Transpose64x64(r_int_v, r_int_h, 64);
for (i = 0; i < 64; i++) //TODO use store8
{
Utils.Store8(r, r_ptr + i * 16 + 0, r_int_v[0 + i]);
Utils.Store8(r, r_ptr + i * 16 + 8, r_int_v[64 + i]);
}
}
/* input: condition bits c */
/* output: support s */
protected internal override void SupportGen(ushort[] s, byte[] c)
{
ushort a;
int i, j;
byte[][] L = new byte[GFBITS][];
for (i = 0; i < GFBITS; i++)
{
for (j = 0; j < (1 << GFBITS) / 8; j++)
{
L[i] = new byte[(1 << GFBITS) / 8];
}
}
for (i = 0; i < (1 << GFBITS); i++)
{
a = Utils.Bitrev((ushort) i, GFBITS);
for (j = 0; j < GFBITS; j++)
{
L[j][i / 8] |= (byte) (((a >> j) & 1) << (i % 8));
}
}
for (j = 0; j < GFBITS; j++)
{
ApplyBenes(L[j], c, 0);
}
for (i = 0; i < SYS_N; i++)
{
s[i] = 0;
for (j = GFBITS - 1; j >= 0; j--)
{
s[i] <<= 1;
s[i] |= (ushort) ((L[j][i / 8] >> (i % 8)) & 1);
}
}
}
}
}
|
