2 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 add_round_key(unsigned *state
, const uint32_t *skeys
)
34 for (i
= 0; i
< 16; i
+= 4) {
38 state
[i
+ 0] ^= (unsigned)(k
>> 24);
39 state
[i
+ 1] ^= (unsigned)(k
>> 16) & 0xFF;
40 state
[i
+ 2] ^= (unsigned)(k
>> 8) & 0xFF;
41 state
[i
+ 3] ^= (unsigned)k
& 0xFF;
46 sub_bytes(unsigned *state
)
50 for (i
= 0; i
< 16; i
++) {
51 state
[i
] = S
[state
[i
]];
56 shift_rows(unsigned *state
)
74 state
[15] = state
[11];
81 mix_columns(unsigned *state
)
85 for (i
= 0; i
< 16; i
+= 4) {
86 unsigned s0
, s1
, s2
, s3
;
87 unsigned t0
, t1
, t2
, t3
;
93 t0
= (s0
<< 1) ^ s1
^ (s1
<< 1) ^ s2
^ s3
;
94 t1
= s0
^ (s1
<< 1) ^ s2
^ (s2
<< 1) ^ s3
;
95 t2
= s0
^ s1
^ (s2
<< 1) ^ s3
^ (s3
<< 1);
96 t3
= s0
^ (s0
<< 1) ^ s1
^ s2
^ (s3
<< 1);
97 state
[i
+ 0] = t0
^ ((unsigned)(-(int)(t0
>> 8)) & 0x11B);
98 state
[i
+ 1] = t1
^ ((unsigned)(-(int)(t1
>> 8)) & 0x11B);
99 state
[i
+ 2] = t2
^ ((unsigned)(-(int)(t2
>> 8)) & 0x11B);
100 state
[i
+ 3] = t3
^ ((unsigned)(-(int)(t3
>> 8)) & 0x11B);
106 br_aes_small_encrypt(unsigned num_rounds
, const uint32_t *skey
, void *data
)
113 for (u
= 0; u
< 16; u
++) {
116 add_round_key(state
, skey
);
117 for (u
= 1; u
< num_rounds
; u
++) {
121 add_round_key(state
, skey
+ (u
<< 2));
125 add_round_key(state
, skey
+ (num_rounds
<< 2));
126 for (u
= 0; u
< 16; u
++) {