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/* aes_encrypt.c - TinyCrypt implementation of AES encryption procedure */
/*
* Copyright (C) 2015 by Intel Corporation, All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* aes_encrypt.c -- An implementation of AES encryption procedure.
*
* See the corresponding header file for more information.
*
*/
#include "aes.h"
#include "utils.h"
static const uint8_t sbox[256] = {
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b,
0xfe, 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26,
0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2,
0xeb, 0x27, 0xb2, 0x75, 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed,
0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f,
0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, 0x13, 0xec,
0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14,
0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d,
0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f,
0x4b, 0xbd, 0x8b, 0x8a, 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11,
0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f,
0xb0, 0x54, 0xbb, 0x16
};
#define rotword(a) (((a)>>24)|((a)<<8))
#define subbyte(a,o) (sbox[((a)>>(o))&0xff]<<(o))
#define subword(a) (subbyte(a,24)|subbyte(a,16)|subbyte(a,8)|subbyte(a,0))
int32_t tc_aes128_set_encrypt_key (TCAesKeySched_t s, const uint8_t *k) {
const uint32_t rconst[11] = {
0x00000000, 0x01000000, 0x02000000, 0x04000000, 0x08000000, 0x10000000,
0x20000000, 0x40000000, 0x80000000, 0x1b000000, 0x36000000
};
uint32_t i;
uint32_t t;
if (s == (TCAesKeySched_t) 0) {
return 0;
} else if (k == (const uint8_t *) 0) {
return 0;
}
for (i = 0; i < Nk; ++i) {
s->words[i] = (k[Nb*i]<<24)|(k[Nb*i+1]<<16)|(k[Nb*i+2]<<8)|(k[Nb*i+3]);
}
for (; i < (Nb*(Nr+1)); ++i) {
t = s->words[i-1];
if ((i % Nk) == 0) {
t = subword (rotword (t)) ^ rconst[i/Nk];
}
s->words[i] = s->words[i-Nk] ^ t;
}
return 1;
}
static inline void add_round_key (uint8_t *s, const uint32_t *k) {
s[ 0] ^= (uint8_t)(k[0]>>24); s[ 1] ^= (uint8_t)(k[0]>>16);
s[ 2] ^= (uint8_t)(k[0]>> 8); s[ 3] ^= (uint8_t)(k[0]);
s[ 4] ^= (uint8_t)(k[1]>>24); s[ 5] ^= (uint8_t)(k[1]>>16);
s[ 6] ^= (uint8_t)(k[1]>> 8); s[ 7] ^= (uint8_t)(k[1]);
s[ 8] ^= (uint8_t)(k[2]>>24); s[ 9] ^= (uint8_t)(k[2]>>16);
s[10] ^= (uint8_t)(k[2]>> 8); s[11] ^= (uint8_t)(k[2]);
s[12] ^= (uint8_t)(k[3]>>24); s[13] ^= (uint8_t)(k[3]>>16);
s[14] ^= (uint8_t)(k[3]>> 8); s[15] ^= (uint8_t)(k[3]);
}
static inline void sub_bytes (uint8_t *s) {
uint32_t i;
for (i = 0; i < (Nb*Nk); ++i) {
s[i] = sbox[s[i]];
}
}
#define triple(a) (double_byte(a)^(a))
static inline void mult_row_column (
uint8_t *out, const uint8_t *in) {
out[0] = double_byte (in[0]) ^ triple (in[1]) ^ in[2] ^ in[3];
out[1] = in[0] ^ double_byte (in[1]) ^ triple (in[2]) ^ in[3];
out[2] = in[0] ^ in[1] ^ double_byte (in[2]) ^ triple (in[3]);
out[3] = triple (in[0]) ^ in[1] ^ in[2] ^ double_byte (in[3]);
}
static inline void mix_columns (uint8_t *s) {
uint8_t t[Nb*Nk];
mult_row_column (t, s);
mult_row_column (&t[Nb], s+Nb);
mult_row_column (&t[2*Nb], s+(2*Nb));
mult_row_column (&t[3*Nb], s+(3*Nb));
(void) copy (s, sizeof (t), t, sizeof (t));
}
/*
* This shift_rows also implements the matrix flip required for mix_columns, but
* performs it here to reduce the number of memory operations.
*/
static inline void shift_rows (uint8_t *s) {
uint8_t t[Nb*Nk];
t[0] = s[ 0]; t[ 1] = s[ 5]; t[ 2] = s[10]; t[ 3] = s[15];
t[4] = s[ 4]; t[ 5] = s[ 9]; t[ 6] = s[14]; t[ 7] = s[ 3];
t[8] = s[ 8]; t[ 9] = s[13]; t[10] = s[ 2]; t[11] = s[ 7];
t[12] = s[12]; t[13] = s[ 1]; t[14] = s[ 6]; t[15] = s[11];
(void) copy (s, sizeof (t), t, sizeof (t));
}
int32_t tc_aes_encrypt (
uint8_t *out, const uint8_t *in, const TCAesKeySched_t s) {
uint8_t state[Nk*Nb];
uint32_t i;
if (out == (uint8_t *) 0) {
return 0;
} else if (in == (const uint8_t *) 0) {
return 0;
} else if (s == (TCAesKeySched_t) 0) {
return 0;
}
(void) copy (state, sizeof (state), in, sizeof (state));
add_round_key (state, s->words);
for (i = 0; i < (Nr-1); ++i) {
sub_bytes (state);
shift_rows (state);
mix_columns (state);
add_round_key (state, s->words + Nb*(i+1));
}
sub_bytes (state);
shift_rows (state);
add_round_key (state, s->words + Nb*(i+1));
(void) copy (out, sizeof (state), state, sizeof (state));
set (state, 0x00, sizeof (state));
return 1;
}
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