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llsec: Allow for sharing AES-128

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kkrentz 2014-04-21 01:41:27 -07:00
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commit 13d9510715
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198
core/lib/aes-128.c Normal file
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/* --COPYRIGHT--,BSD
* Copyright (c) 2011, Texas Instruments Incorporated
* 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 Texas Instruments Incorporated 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.
* --/COPYRIGHT--*/
/*
* TI_aes_128_encr_only.c
*
* Created on: Nov 3, 2011
* Author: Eric Peeters
*/
/**
* \file
* Wrapped AES-128 implementation from Texas Instruments.
* \author
* Konrad Krentz <konrad.krentz@gmail.com>
*/
#include "lib/aes-128.h"
#include <string.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 };
static uint8_t round_keys[11][AES_128_KEY_LENGTH];
/*---------------------------------------------------------------------------*/
/* multiplies by 2 in GF(2) */
static uint8_t
galois_mul2(uint8_t value)
{
if(value >> 7) {
value = value << 1;
return value ^ 0x1b;
} else {
return value << 1;
}
}
/*---------------------------------------------------------------------------*/
static void
set_key(uint8_t *key)
{
uint8_t i;
uint8_t j;
uint8_t rcon;
rcon = 0x01;
memcpy(round_keys[0], key, AES_128_KEY_LENGTH);
for(i = 1; i <= 10; i++) {
round_keys[i][0] = sbox[round_keys[i - 1][13]] ^ round_keys[i - 1][0] ^ rcon;
round_keys[i][1] = sbox[round_keys[i - 1][14]] ^ round_keys[i - 1][1];
round_keys[i][2] = sbox[round_keys[i - 1][15]] ^ round_keys[i - 1][2];
round_keys[i][3] = sbox[round_keys[i - 1][12]] ^ round_keys[i - 1][3];
for(j = 4; j < AES_128_BLOCK_SIZE; j++) {
round_keys[i][j] = round_keys[i - 1][j] ^ round_keys[i][j - 4];
}
rcon = galois_mul2(rcon);
}
}
/*---------------------------------------------------------------------------*/
static void
encrypt(uint8_t *state)
{
uint8_t buf1, buf2, buf3, buf4, round, i;
/* round 0 */
/* AddRoundKey */
for(i = 0; i < AES_128_BLOCK_SIZE; i++) {
state[i] = state[i] ^ round_keys[0][i];
}
for(round = 1; round <= 10; round++) {
/* ByteSub */
for(i = 0; i < AES_128_BLOCK_SIZE; i++) {
state[i] = sbox[state[i]];
}
/* ShiftRow */
buf1 = state[1];
state[1] = state[5];
state[5] = state[9];
state[9] = state[13];
state[13] = buf1;
buf1 = state[2];
buf2 = state[6];
state[2] = state[10];
state[6] = state[14];
state[10] = buf1;
state[14] = buf2;
buf1 = state[15];
state[15] = state[11];
state[11] = state[7];
state[7] = state[3];
state[3] = buf1;
/* last round skips MixColumn */
if(round < 10) {
/* MixColumn */
for(i = 0; i < 4; i++) {
buf4 = (i << 2);
buf1 = state[buf4] ^ state[buf4 + 1] ^ state[buf4 + 2] ^ state[buf4 + 3];
buf2 = state[buf4];
buf3 = state[buf4] ^ state[buf4 + 1];
buf3 = galois_mul2(buf3);
state[buf4] = state[buf4] ^ buf3 ^ buf1;
buf3 = state[buf4 + 1] ^ state[buf4 + 2];
buf3 = galois_mul2(buf3);
state[buf4 + 1] = state[buf4 + 1] ^ buf3 ^ buf1;
buf3 = state[buf4 + 2] ^ state[buf4 + 3];
buf3 = galois_mul2(buf3);
state[buf4 + 2] = state[buf4 + 2] ^ buf3 ^ buf1;
buf3 = state[buf4 + 3] ^ buf2;
buf3 = galois_mul2(buf3);
state[buf4 + 3] = state[buf4 + 3] ^ buf3 ^ buf1;
}
}
/* AddRoundKey */
for(i = 0; i < AES_128_BLOCK_SIZE; i++) {
state[i] = state[i] ^ round_keys[round][i];
}
}
}
/*---------------------------------------------------------------------------*/
void
aes_128_padded_encrypt(uint8_t *plaintext_and_result, uint8_t plaintext_len)
{
uint8_t block[AES_128_BLOCK_SIZE];
memset(block, 0, AES_128_BLOCK_SIZE);
memcpy(block, plaintext_and_result, plaintext_len);
AES_128.encrypt(block);
memcpy(plaintext_and_result, block, plaintext_len);
}
/*---------------------------------------------------------------------------*/
void
aes_128_set_padded_key(uint8_t *key, uint8_t key_len)
{
uint8_t block[AES_128_BLOCK_SIZE];
memset(block, 0, AES_128_BLOCK_SIZE);
memcpy(block, key, key_len);
AES_128.set_key(block);
}
/*---------------------------------------------------------------------------*/
const struct aes_128_driver aes_128_driver = {
set_key,
encrypt
};
/*---------------------------------------------------------------------------*/

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/*
* Copyright (c) 2013, Hasso-Plattner-Institut.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
* AES-128.
* \author
* Konrad Krentz <konrad.krentz@gmail.com>
*/
#ifndef AES_H_
#define AES_H_
#include "contiki.h"
#define AES_128_BLOCK_SIZE 16
#define AES_128_KEY_LENGTH 16
#ifdef AES_128_CONF
#define AES_128 AES_128_CONF
#else /* AES_128_CONF */
#define AES_128 aes_128_driver
#endif /* AES_128_CONF */
/**
* Structure of AES drivers.
*/
struct aes_128_driver {
/**
* \brief Sets the current key.
*/
void (* set_key)(uint8_t *key);
/**
* \brief Encrypts.
*/
void (* encrypt)(uint8_t *plaintext_and_result);
};
/**
* \brief Pads the plaintext with zeroes before calling AES_128.encrypt
*/
void aes_128_padded_encrypt(uint8_t *plaintext_and_result, uint8_t plaintext_len);
/**
* \brief Pads the key with zeroes before calling AES_128.set_key
*/
void aes_128_set_padded_key(uint8_t *key, uint8_t key_len);
extern const struct aes_128_driver AES_128;
#endif /* AES_H_ */