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
|
/* sha3-permute.c
*
* The sha3 permutation function (aka Keccak).
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2012 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "sha3.h"
#include "macros.h"
#define SHA3_ROUNDS 24
void
sha3_permute (struct sha3_state *state)
{
static const uint64_t rc[SHA3_ROUNDS] = {
0x0000000000000001ULL, 0X0000000000008082ULL,
0X800000000000808AULL, 0X8000000080008000ULL,
0X000000000000808BULL, 0X0000000080000001ULL,
0X8000000080008081ULL, 0X8000000000008009ULL,
0X000000000000008AULL, 0X0000000000000088ULL,
0X0000000080008009ULL, 0X000000008000000AULL,
0X000000008000808BULL, 0X800000000000008BULL,
0X8000000000008089ULL, 0X8000000000008003ULL,
0X8000000000008002ULL, 0X8000000000000080ULL,
0X000000000000800AULL, 0X800000008000000AULL,
0X8000000080008081ULL, 0X8000000000008080ULL,
0X0000000080000001ULL, 0X8000000080008008ULL,
};
/* Original permutation:
0,10,20, 5,15,
16, 1,11,21, 6,
7,17, 2,12,22,
23, 8,18, 3,13,
14,24, 9,19, 4
Rotation counts:
0, 1, 62, 28, 27,
36, 44, 6, 55, 20,
3, 10, 43, 25, 39,
41, 45, 15, 21, 8,
18, 2, 61, 56, 14,
*/
/* In-place implementation. Permutation done as a long sequence of
25 moves "following" the permutation.
T <-- 1
1 <-- 6
6 <-- 9
9 <-- 22
22 <-- 14
14 <-- 20
20 <-- 2
2 <-- 12
12 <-- 13
13 <-- 19
19 <-- 23
23 <-- 15
15 <-- 4
4 <-- 24
24 <-- 21
21 <-- 8
8 <-- 16
16 <-- 5
5 <-- 3
3 <-- 18
18 <-- 17
17 <-- 11
11 <-- 7
7 <-- 10
10 <-- T
*/
uint64_t C[5], D[5], T, X;
unsigned i, y;
#define A state->a
C[0] = A[0] ^ A[5+0] ^ A[10+0] ^ A[15+0] ^ A[20+0];
C[1] = A[1] ^ A[5+1] ^ A[10+1] ^ A[15+1] ^ A[20+1];
C[2] = A[2] ^ A[5+2] ^ A[10+2] ^ A[15+2] ^ A[20+2];
C[3] = A[3] ^ A[5+3] ^ A[10+3] ^ A[15+3] ^ A[20+3];
C[4] = A[4] ^ A[5+4] ^ A[10+4] ^ A[15+4] ^ A[20+4];
for (i = 0; i < SHA3_ROUNDS; i++)
{
D[0] = C[4] ^ ROTL64(1, C[1]);
D[1] = C[0] ^ ROTL64(1, C[2]);
D[2] = C[1] ^ ROTL64(1, C[3]);
D[3] = C[2] ^ ROTL64(1, C[4]);
D[4] = C[3] ^ ROTL64(1, C[0]);
A[0] ^= D[0];
X = A[ 1] ^ D[1]; T = ROTL64(1, X);
X = A[ 6] ^ D[1]; A[ 1] = ROTL64 (44, X);
X = A[ 9] ^ D[4]; A[ 6] = ROTL64 (20, X);
X = A[22] ^ D[2]; A[ 9] = ROTL64 (61, X);
X = A[14] ^ D[4]; A[22] = ROTL64 (39, X);
X = A[20] ^ D[0]; A[14] = ROTL64 (18, X);
X = A[ 2] ^ D[2]; A[20] = ROTL64 (62, X);
X = A[12] ^ D[2]; A[ 2] = ROTL64 (43, X);
X = A[13] ^ D[3]; A[12] = ROTL64 (25, X);
X = A[19] ^ D[4]; A[13] = ROTL64 ( 8, X);
X = A[23] ^ D[3]; A[19] = ROTL64 (56, X);
X = A[15] ^ D[0]; A[23] = ROTL64 (41, X);
X = A[ 4] ^ D[4]; A[15] = ROTL64 (27, X);
X = A[24] ^ D[4]; A[ 4] = ROTL64 (14, X);
X = A[21] ^ D[1]; A[24] = ROTL64 ( 2, X);
X = A[ 8] ^ D[3]; A[21] = ROTL64 (55, X); /* row 4 done */
X = A[16] ^ D[1]; A[ 8] = ROTL64 (45, X);
X = A[ 5] ^ D[0]; A[16] = ROTL64 (36, X);
X = A[ 3] ^ D[3]; A[ 5] = ROTL64 (28, X);
X = A[18] ^ D[3]; A[ 3] = ROTL64 (21, X); /* row 0 done */
X = A[17] ^ D[2]; A[18] = ROTL64 (15, X);
X = A[11] ^ D[1]; A[17] = ROTL64 (10, X); /* row 3 done */
X = A[ 7] ^ D[2]; A[11] = ROTL64 ( 6, X); /* row 1 done */
X = A[10] ^ D[0]; A[ 7] = ROTL64 ( 3, X);
A[10] = T; /* row 2 done */
D[0] = ~A[1] & A[2];
D[1] = ~A[2] & A[3];
D[2] = ~A[3] & A[4];
D[3] = ~A[4] & A[0];
D[4] = ~A[0] & A[1];
A[0] ^= D[0] ^ rc[i]; C[0] = A[0];
A[1] ^= D[1]; C[1] = A[1];
A[2] ^= D[2]; C[2] = A[2];
A[3] ^= D[3]; C[3] = A[3];
A[4] ^= D[4]; C[4] = A[4];
for (y = 5; y < 25; y+= 5)
{
D[0] = ~A[y+1] & A[y+2];
D[1] = ~A[y+2] & A[y+3];
D[2] = ~A[y+3] & A[y+4];
D[3] = ~A[y+4] & A[y+0];
D[4] = ~A[y+0] & A[y+1];
A[y+0] ^= D[0]; C[0] ^= A[y+0];
A[y+1] ^= D[1]; C[1] ^= A[y+1];
A[y+2] ^= D[2]; C[2] ^= A[y+2];
A[y+3] ^= D[3]; C[3] ^= A[y+3];
A[y+4] ^= D[4]; C[4] ^= A[y+4];
}
}
#undef A
}
|