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 static const uint32_t Rcon[] = {
28*0957b409SSimon J. Gerraty 0x01000000, 0x02000000, 0x04000000, 0x08000000, 0x10000000, 0x20000000,
29*0957b409SSimon J. Gerraty 0x40000000, 0x80000000, 0x1B000000, 0x36000000
30*0957b409SSimon J. Gerraty };
31*0957b409SSimon J. Gerraty
32*0957b409SSimon J. Gerraty #define S br_aes_S
33*0957b409SSimon J. Gerraty
34*0957b409SSimon J. Gerraty /* see inner.h */
35*0957b409SSimon J. Gerraty const unsigned char br_aes_S[] = {
36*0957b409SSimon J. Gerraty 0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B,
37*0957b409SSimon J. Gerraty 0xFE, 0xD7, 0xAB, 0x76, 0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0,
38*0957b409SSimon J. Gerraty 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0, 0xB7, 0xFD, 0x93, 0x26,
39*0957b409SSimon J. Gerraty 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
40*0957b409SSimon J. Gerraty 0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2,
41*0957b409SSimon J. Gerraty 0xEB, 0x27, 0xB2, 0x75, 0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0,
42*0957b409SSimon J. Gerraty 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84, 0x53, 0xD1, 0x00, 0xED,
43*0957b409SSimon J. Gerraty 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
44*0957b409SSimon J. Gerraty 0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F,
45*0957b409SSimon J. Gerraty 0x50, 0x3C, 0x9F, 0xA8, 0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5,
46*0957b409SSimon J. Gerraty 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2, 0xCD, 0x0C, 0x13, 0xEC,
47*0957b409SSimon J. Gerraty 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
48*0957b409SSimon J. Gerraty 0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14,
49*0957b409SSimon J. Gerraty 0xDE, 0x5E, 0x0B, 0xDB, 0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C,
50*0957b409SSimon J. Gerraty 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79, 0xE7, 0xC8, 0x37, 0x6D,
51*0957b409SSimon J. Gerraty 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
52*0957b409SSimon J. Gerraty 0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F,
53*0957b409SSimon J. Gerraty 0x4B, 0xBD, 0x8B, 0x8A, 0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E,
54*0957b409SSimon J. Gerraty 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E, 0xE1, 0xF8, 0x98, 0x11,
55*0957b409SSimon J. Gerraty 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
56*0957b409SSimon J. Gerraty 0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F,
57*0957b409SSimon J. Gerraty 0xB0, 0x54, 0xBB, 0x16
58*0957b409SSimon J. Gerraty };
59*0957b409SSimon J. Gerraty
60*0957b409SSimon J. Gerraty static uint32_t
SubWord(uint32_t x)61*0957b409SSimon J. Gerraty SubWord(uint32_t x)
62*0957b409SSimon J. Gerraty {
63*0957b409SSimon J. Gerraty return ((uint32_t)S[x >> 24] << 24)
64*0957b409SSimon J. Gerraty | ((uint32_t)S[(x >> 16) & 0xFF] << 16)
65*0957b409SSimon J. Gerraty | ((uint32_t)S[(x >> 8) & 0xFF] << 8)
66*0957b409SSimon J. Gerraty | (uint32_t)S[x & 0xFF];
67*0957b409SSimon J. Gerraty }
68*0957b409SSimon J. Gerraty
69*0957b409SSimon J. Gerraty /* see inner.h */
70*0957b409SSimon J. Gerraty unsigned
br_aes_keysched(uint32_t * skey,const void * key,size_t key_len)71*0957b409SSimon J. Gerraty br_aes_keysched(uint32_t *skey, const void *key, size_t key_len)
72*0957b409SSimon J. Gerraty {
73*0957b409SSimon J. Gerraty unsigned num_rounds;
74*0957b409SSimon J. Gerraty int i, j, k, nk, nkf;
75*0957b409SSimon J. Gerraty
76*0957b409SSimon J. Gerraty switch (key_len) {
77*0957b409SSimon J. Gerraty case 16:
78*0957b409SSimon J. Gerraty num_rounds = 10;
79*0957b409SSimon J. Gerraty break;
80*0957b409SSimon J. Gerraty case 24:
81*0957b409SSimon J. Gerraty num_rounds = 12;
82*0957b409SSimon J. Gerraty break;
83*0957b409SSimon J. Gerraty case 32:
84*0957b409SSimon J. Gerraty num_rounds = 14;
85*0957b409SSimon J. Gerraty break;
86*0957b409SSimon J. Gerraty default:
87*0957b409SSimon J. Gerraty /* abort(); */
88*0957b409SSimon J. Gerraty return 0;
89*0957b409SSimon J. Gerraty }
90*0957b409SSimon J. Gerraty nk = (int)(key_len >> 2);
91*0957b409SSimon J. Gerraty nkf = (int)((num_rounds + 1) << 2);
92*0957b409SSimon J. Gerraty for (i = 0; i < nk; i ++) {
93*0957b409SSimon J. Gerraty skey[i] = br_dec32be((const unsigned char *)key + (i << 2));
94*0957b409SSimon J. Gerraty }
95*0957b409SSimon J. Gerraty for (i = nk, j = 0, k = 0; i < nkf; i ++) {
96*0957b409SSimon J. Gerraty uint32_t tmp;
97*0957b409SSimon J. Gerraty
98*0957b409SSimon J. Gerraty tmp = skey[i - 1];
99*0957b409SSimon J. Gerraty if (j == 0) {
100*0957b409SSimon J. Gerraty tmp = (tmp << 8) | (tmp >> 24);
101*0957b409SSimon J. Gerraty tmp = SubWord(tmp) ^ Rcon[k];
102*0957b409SSimon J. Gerraty } else if (nk > 6 && j == 4) {
103*0957b409SSimon J. Gerraty tmp = SubWord(tmp);
104*0957b409SSimon J. Gerraty }
105*0957b409SSimon J. Gerraty skey[i] = skey[i - nk] ^ tmp;
106*0957b409SSimon J. Gerraty if (++ j == nk) {
107*0957b409SSimon J. Gerraty j = 0;
108*0957b409SSimon J. Gerraty k ++;
109*0957b409SSimon J. Gerraty }
110*0957b409SSimon J. Gerraty }
111*0957b409SSimon J. Gerraty return num_rounds;
112*0957b409SSimon J. Gerraty }
113