1*0957b409SSimon J. Gerraty /*
2*0957b409SSimon J. Gerraty * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
3*0957b409SSimon J. Gerraty *
4*0957b409SSimon J. Gerraty * Permission is hereby granted, free of charge, to any person obtaining
5*0957b409SSimon J. Gerraty * a copy of this software and associated documentation files (the
6*0957b409SSimon J. Gerraty * "Software"), to deal in the Software without restriction, including
7*0957b409SSimon J. Gerraty * without limitation the rights to use, copy, modify, merge, publish,
8*0957b409SSimon J. Gerraty * distribute, sublicense, and/or sell copies of the Software, and to
9*0957b409SSimon J. Gerraty * permit persons to whom the Software is furnished to do so, subject to
10*0957b409SSimon J. Gerraty * the following conditions:
11*0957b409SSimon J. Gerraty *
12*0957b409SSimon J. Gerraty * The above copyright notice and this permission notice shall be
13*0957b409SSimon J. Gerraty * included in all copies or substantial portions of the Software.
14*0957b409SSimon J. Gerraty *
15*0957b409SSimon J. Gerraty * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16*0957b409SSimon J. Gerraty * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17*0957b409SSimon J. Gerraty * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18*0957b409SSimon J. Gerraty * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19*0957b409SSimon J. Gerraty * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20*0957b409SSimon J. Gerraty * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21*0957b409SSimon J. Gerraty * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22*0957b409SSimon J. Gerraty * SOFTWARE.
23*0957b409SSimon J. Gerraty */
24*0957b409SSimon J. Gerraty
25*0957b409SSimon J. Gerraty #include "inner.h"
26*0957b409SSimon J. Gerraty
27*0957b409SSimon J. Gerraty #define S br_aes_S
28*0957b409SSimon J. Gerraty
29*0957b409SSimon J. Gerraty static void
add_round_key(unsigned * state,const uint32_t * skeys)30*0957b409SSimon J. Gerraty add_round_key(unsigned *state, const uint32_t *skeys)
31*0957b409SSimon J. Gerraty {
32*0957b409SSimon J. Gerraty int i;
33*0957b409SSimon J. Gerraty
34*0957b409SSimon J. Gerraty for (i = 0; i < 16; i += 4) {
35*0957b409SSimon J. Gerraty uint32_t k;
36*0957b409SSimon J. Gerraty
37*0957b409SSimon J. Gerraty k = *skeys ++;
38*0957b409SSimon J. Gerraty state[i + 0] ^= (unsigned)(k >> 24);
39*0957b409SSimon J. Gerraty state[i + 1] ^= (unsigned)(k >> 16) & 0xFF;
40*0957b409SSimon J. Gerraty state[i + 2] ^= (unsigned)(k >> 8) & 0xFF;
41*0957b409SSimon J. Gerraty state[i + 3] ^= (unsigned)k & 0xFF;
42*0957b409SSimon J. Gerraty }
43*0957b409SSimon J. Gerraty }
44*0957b409SSimon J. Gerraty
45*0957b409SSimon J. Gerraty static void
sub_bytes(unsigned * state)46*0957b409SSimon J. Gerraty sub_bytes(unsigned *state)
47*0957b409SSimon J. Gerraty {
48*0957b409SSimon J. Gerraty int i;
49*0957b409SSimon J. Gerraty
50*0957b409SSimon J. Gerraty for (i = 0; i < 16; i ++) {
51*0957b409SSimon J. Gerraty state[i] = S[state[i]];
52*0957b409SSimon J. Gerraty }
53*0957b409SSimon J. Gerraty }
54*0957b409SSimon J. Gerraty
55*0957b409SSimon J. Gerraty static void
shift_rows(unsigned * state)56*0957b409SSimon J. Gerraty shift_rows(unsigned *state)
57*0957b409SSimon J. Gerraty {
58*0957b409SSimon J. Gerraty unsigned tmp;
59*0957b409SSimon J. Gerraty
60*0957b409SSimon J. Gerraty tmp = state[1];
61*0957b409SSimon J. Gerraty state[1] = state[5];
62*0957b409SSimon J. Gerraty state[5] = state[9];
63*0957b409SSimon J. Gerraty state[9] = state[13];
64*0957b409SSimon J. Gerraty state[13] = tmp;
65*0957b409SSimon J. Gerraty
66*0957b409SSimon J. Gerraty tmp = state[2];
67*0957b409SSimon J. Gerraty state[2] = state[10];
68*0957b409SSimon J. Gerraty state[10] = tmp;
69*0957b409SSimon J. Gerraty tmp = state[6];
70*0957b409SSimon J. Gerraty state[6] = state[14];
71*0957b409SSimon J. Gerraty state[14] = tmp;
72*0957b409SSimon J. Gerraty
73*0957b409SSimon J. Gerraty tmp = state[15];
74*0957b409SSimon J. Gerraty state[15] = state[11];
75*0957b409SSimon J. Gerraty state[11] = state[7];
76*0957b409SSimon J. Gerraty state[7] = state[3];
77*0957b409SSimon J. Gerraty state[3] = tmp;
78*0957b409SSimon J. Gerraty }
79*0957b409SSimon J. Gerraty
80*0957b409SSimon J. Gerraty static void
mix_columns(unsigned * state)81*0957b409SSimon J. Gerraty mix_columns(unsigned *state)
82*0957b409SSimon J. Gerraty {
83*0957b409SSimon J. Gerraty int i;
84*0957b409SSimon J. Gerraty
85*0957b409SSimon J. Gerraty for (i = 0; i < 16; i += 4) {
86*0957b409SSimon J. Gerraty unsigned s0, s1, s2, s3;
87*0957b409SSimon J. Gerraty unsigned t0, t1, t2, t3;
88*0957b409SSimon J. Gerraty
89*0957b409SSimon J. Gerraty s0 = state[i + 0];
90*0957b409SSimon J. Gerraty s1 = state[i + 1];
91*0957b409SSimon J. Gerraty s2 = state[i + 2];
92*0957b409SSimon J. Gerraty s3 = state[i + 3];
93*0957b409SSimon J. Gerraty t0 = (s0 << 1) ^ s1 ^ (s1 << 1) ^ s2 ^ s3;
94*0957b409SSimon J. Gerraty t1 = s0 ^ (s1 << 1) ^ s2 ^ (s2 << 1) ^ s3;
95*0957b409SSimon J. Gerraty t2 = s0 ^ s1 ^ (s2 << 1) ^ s3 ^ (s3 << 1);
96*0957b409SSimon J. Gerraty t3 = s0 ^ (s0 << 1) ^ s1 ^ s2 ^ (s3 << 1);
97*0957b409SSimon J. Gerraty state[i + 0] = t0 ^ ((unsigned)(-(int)(t0 >> 8)) & 0x11B);
98*0957b409SSimon J. Gerraty state[i + 1] = t1 ^ ((unsigned)(-(int)(t1 >> 8)) & 0x11B);
99*0957b409SSimon J. Gerraty state[i + 2] = t2 ^ ((unsigned)(-(int)(t2 >> 8)) & 0x11B);
100*0957b409SSimon J. Gerraty state[i + 3] = t3 ^ ((unsigned)(-(int)(t3 >> 8)) & 0x11B);
101*0957b409SSimon J. Gerraty }
102*0957b409SSimon J. Gerraty }
103*0957b409SSimon J. Gerraty
104*0957b409SSimon J. Gerraty /* see inner.h */
105*0957b409SSimon J. Gerraty void
br_aes_small_encrypt(unsigned num_rounds,const uint32_t * skey,void * data)106*0957b409SSimon J. Gerraty br_aes_small_encrypt(unsigned num_rounds, const uint32_t *skey, void *data)
107*0957b409SSimon J. Gerraty {
108*0957b409SSimon J. Gerraty unsigned char *buf;
109*0957b409SSimon J. Gerraty unsigned state[16];
110*0957b409SSimon J. Gerraty unsigned u;
111*0957b409SSimon J. Gerraty
112*0957b409SSimon J. Gerraty buf = data;
113*0957b409SSimon J. Gerraty for (u = 0; u < 16; u ++) {
114*0957b409SSimon J. Gerraty state[u] = buf[u];
115*0957b409SSimon J. Gerraty }
116*0957b409SSimon J. Gerraty add_round_key(state, skey);
117*0957b409SSimon J. Gerraty for (u = 1; u < num_rounds; u ++) {
118*0957b409SSimon J. Gerraty sub_bytes(state);
119*0957b409SSimon J. Gerraty shift_rows(state);
120*0957b409SSimon J. Gerraty mix_columns(state);
121*0957b409SSimon J. Gerraty add_round_key(state, skey + (u << 2));
122*0957b409SSimon J. Gerraty }
123*0957b409SSimon J. Gerraty sub_bytes(state);
124*0957b409SSimon J. Gerraty shift_rows(state);
125*0957b409SSimon J. Gerraty add_round_key(state, skey + (num_rounds << 2));
126*0957b409SSimon J. Gerraty for (u = 0; u < 16; u ++) {
127*0957b409SSimon J. Gerraty buf[u] = state[u];
128*0957b409SSimon J. Gerraty }
129*0957b409SSimon J. Gerraty }
130