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
|
/* aes-invert-internal.c
Inverse key setup for the aes/rijndael block cipher.
Copyright (C) 2000, 2001, 2002 Rafael R. Sevilla, Niels Möller
Copyright (C) 2013 Niels Möller
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle 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
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
*/
/* Originally written by Rafael R. Sevilla <dido@pacific.net.ph> */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "aes-internal.h"
#include "macros.h"
/* NOTE: We don't include rotated versions of the table. */
static const uint32_t mtable[0x100] =
{
0x00000000,0x0b0d090e,0x161a121c,0x1d171b12,
0x2c342438,0x27392d36,0x3a2e3624,0x31233f2a,
0x58684870,0x5365417e,0x4e725a6c,0x457f5362,
0x745c6c48,0x7f516546,0x62467e54,0x694b775a,
0xb0d090e0,0xbbdd99ee,0xa6ca82fc,0xadc78bf2,
0x9ce4b4d8,0x97e9bdd6,0x8afea6c4,0x81f3afca,
0xe8b8d890,0xe3b5d19e,0xfea2ca8c,0xf5afc382,
0xc48cfca8,0xcf81f5a6,0xd296eeb4,0xd99be7ba,
0x7bbb3bdb,0x70b632d5,0x6da129c7,0x66ac20c9,
0x578f1fe3,0x5c8216ed,0x41950dff,0x4a9804f1,
0x23d373ab,0x28de7aa5,0x35c961b7,0x3ec468b9,
0x0fe75793,0x04ea5e9d,0x19fd458f,0x12f04c81,
0xcb6bab3b,0xc066a235,0xdd71b927,0xd67cb029,
0xe75f8f03,0xec52860d,0xf1459d1f,0xfa489411,
0x9303e34b,0x980eea45,0x8519f157,0x8e14f859,
0xbf37c773,0xb43ace7d,0xa92dd56f,0xa220dc61,
0xf66d76ad,0xfd607fa3,0xe07764b1,0xeb7a6dbf,
0xda595295,0xd1545b9b,0xcc434089,0xc74e4987,
0xae053edd,0xa50837d3,0xb81f2cc1,0xb31225cf,
0x82311ae5,0x893c13eb,0x942b08f9,0x9f2601f7,
0x46bde64d,0x4db0ef43,0x50a7f451,0x5baafd5f,
0x6a89c275,0x6184cb7b,0x7c93d069,0x779ed967,
0x1ed5ae3d,0x15d8a733,0x08cfbc21,0x03c2b52f,
0x32e18a05,0x39ec830b,0x24fb9819,0x2ff69117,
0x8dd64d76,0x86db4478,0x9bcc5f6a,0x90c15664,
0xa1e2694e,0xaaef6040,0xb7f87b52,0xbcf5725c,
0xd5be0506,0xdeb30c08,0xc3a4171a,0xc8a91e14,
0xf98a213e,0xf2872830,0xef903322,0xe49d3a2c,
0x3d06dd96,0x360bd498,0x2b1ccf8a,0x2011c684,
0x1132f9ae,0x1a3ff0a0,0x0728ebb2,0x0c25e2bc,
0x656e95e6,0x6e639ce8,0x737487fa,0x78798ef4,
0x495ab1de,0x4257b8d0,0x5f40a3c2,0x544daacc,
0xf7daec41,0xfcd7e54f,0xe1c0fe5d,0xeacdf753,
0xdbeec879,0xd0e3c177,0xcdf4da65,0xc6f9d36b,
0xafb2a431,0xa4bfad3f,0xb9a8b62d,0xb2a5bf23,
0x83868009,0x888b8907,0x959c9215,0x9e919b1b,
0x470a7ca1,0x4c0775af,0x51106ebd,0x5a1d67b3,
0x6b3e5899,0x60335197,0x7d244a85,0x7629438b,
0x1f6234d1,0x146f3ddf,0x097826cd,0x02752fc3,
0x335610e9,0x385b19e7,0x254c02f5,0x2e410bfb,
0x8c61d79a,0x876cde94,0x9a7bc586,0x9176cc88,
0xa055f3a2,0xab58faac,0xb64fe1be,0xbd42e8b0,
0xd4099fea,0xdf0496e4,0xc2138df6,0xc91e84f8,
0xf83dbbd2,0xf330b2dc,0xee27a9ce,0xe52aa0c0,
0x3cb1477a,0x37bc4e74,0x2aab5566,0x21a65c68,
0x10856342,0x1b886a4c,0x069f715e,0x0d927850,
0x64d90f0a,0x6fd40604,0x72c31d16,0x79ce1418,
0x48ed2b32,0x43e0223c,0x5ef7392e,0x55fa3020,
0x01b79aec,0x0aba93e2,0x17ad88f0,0x1ca081fe,
0x2d83bed4,0x268eb7da,0x3b99acc8,0x3094a5c6,
0x59dfd29c,0x52d2db92,0x4fc5c080,0x44c8c98e,
0x75ebf6a4,0x7ee6ffaa,0x63f1e4b8,0x68fcedb6,
0xb1670a0c,0xba6a0302,0xa77d1810,0xac70111e,
0x9d532e34,0x965e273a,0x8b493c28,0x80443526,
0xe90f427c,0xe2024b72,0xff155060,0xf418596e,
0xc53b6644,0xce366f4a,0xd3217458,0xd82c7d56,
0x7a0ca137,0x7101a839,0x6c16b32b,0x671bba25,
0x5638850f,0x5d358c01,0x40229713,0x4b2f9e1d,
0x2264e947,0x2969e049,0x347efb5b,0x3f73f255,
0x0e50cd7f,0x055dc471,0x184adf63,0x1347d66d,
0xcadc31d7,0xc1d138d9,0xdcc623cb,0xd7cb2ac5,
0xe6e815ef,0xede51ce1,0xf0f207f3,0xfbff0efd,
0x92b479a7,0x99b970a9,0x84ae6bbb,0x8fa362b5,
0xbe805d9f,0xb58d5491,0xa89a4f83,0xa397468d,
};
#define MIX_COLUMN(T, key) do { \
uint32_t _k, _nk, _t; \
_k = (key); \
_nk = T[_k & 0xff]; \
_k >>= 8; \
_t = T[_k & 0xff]; \
_nk ^= ROTL32(8, _t); \
_k >>= 8; \
_t = T[_k & 0xff]; \
_nk ^= ROTL32(16, _t); \
_k >>= 8; \
_t = T[_k & 0xff]; \
_nk ^= ROTL32(24, _t); \
(key) = _nk; \
} while(0)
#define SWAP(a, b) \
do { uint32_t t_swap = (a); (a) = (b); (b) = t_swap; } while(0)
void
_nettle_aes_invert(unsigned rounds, uint32_t *dst, const uint32_t *src)
{
unsigned i;
/* Reverse the order of subkeys, in groups of 4. */
/* FIXME: Instead of reordering the subkeys, change the access order
of aes_decrypt, since it's a separate function anyway? */
if (src == dst)
{
unsigned j, k;
for (i = 0, j = rounds * 4;
i < j;
i += 4, j -= 4)
for (k = 0; k<4; k++)
SWAP(dst[i+k], dst[j+k]);
}
else
{
unsigned k;
for (i = 0; i <= rounds * 4; i += 4)
for (k = 0; k < 4; k++)
dst[i+k] = src[rounds * 4 - i + k];
}
/* Transform all subkeys but the first and last. */
for (i = 4; i < 4 * rounds; i++)
MIX_COLUMN (mtable, dst[i]);
}
|
