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Integration of Link Layer Security
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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); | ||
|
|
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| state[buf4] = state[buf4] ^ buf3 ^ buf1; | ||
|
|
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| buf3 = state[buf4 + 1] ^ state[buf4 + 2]; | ||
| buf3 = galois_mul2(buf3); | ||
| state[buf4 + 1] = state[buf4 + 1] ^ buf3 ^ buf1; | ||
|
|
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| buf3 = state[buf4 + 2] ^ state[buf4 + 3]; | ||
| buf3 = galois_mul2(buf3); | ||
| state[buf4 + 2] = state[buf4 + 2] ^ buf3 ^ buf1; | ||
|
|
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| 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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