etienne maillet / Mbed 2 deprecated LoRaWAN-demo-passag_texte

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Dependencies:   mbed LoRaWAN-lib SX1272Lib

system/crypto/cmac.cpp@0:45496a70a8a5, 2016-01-07 (annotated)

Committer:
mluis
Date:
Thu Jan 07 15:11:08 2016 +0000
Revision:
0:45496a70a8a5
Child:
3:3152aa75c58d
Initial commit

Who changed what in which revision?

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mluis 0:45496a70a8a5 1 /**************************************************************************
mluis 0:45496a70a8a5 2 Copyright (C) 2009 Lander Casado, Philippas Tsigas
mluis 0:45496a70a8a5 3
mluis 0:45496a70a8a5 4 All rights reserved.
mluis 0:45496a70a8a5 5
mluis 0:45496a70a8a5 6 Permission is hereby granted, free of charge, to any person obtaining
mluis 0:45496a70a8a5 7 a copy of this software and associated documentation files
mluis 0:45496a70a8a5 8 (the "Software"), to deal with the Software without restriction, including
mluis 0:45496a70a8a5 9 without limitation the rights to use, copy, modify, merge, publish,
mluis 0:45496a70a8a5 10 distribute, sublicense, and/or sell copies of the Software, and to
mluis 0:45496a70a8a5 11 permit persons to whom the Software is furnished to do so, subject to
mluis 0:45496a70a8a5 12 the following conditions:
mluis 0:45496a70a8a5 13
mluis 0:45496a70a8a5 14 Redistributions of source code must retain the above copyright notice,
mluis 0:45496a70a8a5 15 this list of conditions and the following disclaimers. Redistributions in
mluis 0:45496a70a8a5 16 binary form must reproduce the above copyright notice, this list of
mluis 0:45496a70a8a5 17 conditions and the following disclaimers in the documentation and/or
mluis 0:45496a70a8a5 18 other materials provided with the distribution.
mluis 0:45496a70a8a5 19
mluis 0:45496a70a8a5 20 In no event shall the authors or copyright holders be liable for any special,
mluis 0:45496a70a8a5 21 incidental, indirect or consequential damages of any kind, or any damages
mluis 0:45496a70a8a5 22 whatsoever resulting from loss of use, data or profits, whether or not
mluis 0:45496a70a8a5 23 advised of the possibility of damage, and on any theory of liability,
mluis 0:45496a70a8a5 24 arising out of or in connection with the use or performance of this software.
mluis 0:45496a70a8a5 25
mluis 0:45496a70a8a5 26 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
mluis 0:45496a70a8a5 27 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mluis 0:45496a70a8a5 28 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mluis 0:45496a70a8a5 29 CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mluis 0:45496a70a8a5 30 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
mluis 0:45496a70a8a5 31 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
mluis 0:45496a70a8a5 32 DEALINGS WITH THE SOFTWARE
mluis 0:45496a70a8a5 33
mluis 0:45496a70a8a5 34 *****************************************************************************/
mluis 0:45496a70a8a5 35 //#include <sys/param.h>
mluis 0:45496a70a8a5 36 //#include <sys/systm.h>
mluis 0:45496a70a8a5 37 #include <stdint.h>
mluis 0:45496a70a8a5 38 #include "aes.h"
mluis 0:45496a70a8a5 39 #include "cmac.h"
mluis 0:45496a70a8a5 40 #include "utilities.h"
mluis 0:45496a70a8a5 41
mluis 0:45496a70a8a5 42 #define LSHIFT(v, r) do { \
mluis 0:45496a70a8a5 43 int32_t i; \
mluis 0:45496a70a8a5 44 for (i = 0; i < 15; i++) \
mluis 0:45496a70a8a5 45 (r)[i] = (v)[i] << 1 | (v)[i + 1] >> 7; \
mluis 0:45496a70a8a5 46 (r)[15] = (v)[15] << 1; \
mluis 0:45496a70a8a5 47 } while (0)
mluis 0:45496a70a8a5 48
mluis 0:45496a70a8a5 49 #define XOR(v, r) do { \
mluis 0:45496a70a8a5 50 int32_t i; \
mluis 0:45496a70a8a5 51 for (i = 0; i < 16; i++) \
mluis 0:45496a70a8a5 52 { \
mluis 0:45496a70a8a5 53 (r)[i] = (r)[i] ^ (v)[i]; \
mluis 0:45496a70a8a5 54 } \
mluis 0:45496a70a8a5 55 } while (0) \
mluis 0:45496a70a8a5 56
mluis 0:45496a70a8a5 57
mluis 0:45496a70a8a5 58 void AES_CMAC_Init(AES_CMAC_CTX *ctx)
mluis 0:45496a70a8a5 59 {
mluis 0:45496a70a8a5 60 memset1(ctx->X, 0, sizeof ctx->X);
mluis 0:45496a70a8a5 61 ctx->M_n = 0;
mluis 0:45496a70a8a5 62 memset1(ctx->rijndael.ksch, '\0', 240);
mluis 0:45496a70a8a5 63 }
mluis 0:45496a70a8a5 64
mluis 0:45496a70a8a5 65 void AES_CMAC_SetKey(AES_CMAC_CTX *ctx, const uint8_t key[AES_CMAC_KEY_LENGTH])
mluis 0:45496a70a8a5 66 {
mluis 0:45496a70a8a5 67 //rijndael_set_key_enc_only(&ctx->rijndael, key, 128);
mluis 0:45496a70a8a5 68 aes_set_key( key, AES_CMAC_KEY_LENGTH, &ctx->rijndael);
mluis 0:45496a70a8a5 69 }
mluis 0:45496a70a8a5 70
mluis 0:45496a70a8a5 71 void AES_CMAC_Update(AES_CMAC_CTX *ctx, const uint8_t *data, uint32_t len)
mluis 0:45496a70a8a5 72 {
mluis 0:45496a70a8a5 73 uint32_t mlen;
mluis 0:45496a70a8a5 74 uint8_t in[16];
mluis 0:45496a70a8a5 75
mluis 0:45496a70a8a5 76 if (ctx->M_n > 0) {
mluis 0:45496a70a8a5 77 mlen = MIN(16 - ctx->M_n, len);
mluis 0:45496a70a8a5 78 memcpy1(ctx->M_last + ctx->M_n, data, mlen);
mluis 0:45496a70a8a5 79 ctx->M_n += mlen;
mluis 0:45496a70a8a5 80 if (ctx->M_n < 16 || len == mlen)
mluis 0:45496a70a8a5 81 return;
mluis 0:45496a70a8a5 82 XOR(ctx->M_last, ctx->X);
mluis 0:45496a70a8a5 83 //rijndael_encrypt(&ctx->rijndael, ctx->X, ctx->X);
mluis 0:45496a70a8a5 84 aes_encrypt( ctx->X, ctx->X, &ctx->rijndael);
mluis 0:45496a70a8a5 85 data += mlen;
mluis 0:45496a70a8a5 86 len -= mlen;
mluis 0:45496a70a8a5 87 }
mluis 0:45496a70a8a5 88 while (len > 16) { /* not last block */
mluis 0:45496a70a8a5 89
mluis 0:45496a70a8a5 90 XOR(data, ctx->X);
mluis 0:45496a70a8a5 91 //rijndael_encrypt(&ctx->rijndael, ctx->X, ctx->X);
mluis 0:45496a70a8a5 92
mluis 0:45496a70a8a5 93 memcpy1(in, &ctx->X[0], 16); //Bestela ez du ondo iten
mluis 0:45496a70a8a5 94 aes_encrypt( in, in, &ctx->rijndael);
mluis 0:45496a70a8a5 95 memcpy1(&ctx->X[0], in, 16);
mluis 0:45496a70a8a5 96
mluis 0:45496a70a8a5 97 data += 16;
mluis 0:45496a70a8a5 98 len -= 16;
mluis 0:45496a70a8a5 99 }
mluis 0:45496a70a8a5 100 /* potential last block, save it */
mluis 0:45496a70a8a5 101 memcpy1(ctx->M_last, data, len);
mluis 0:45496a70a8a5 102 ctx->M_n = len;
mluis 0:45496a70a8a5 103 }
mluis 0:45496a70a8a5 104
mluis 0:45496a70a8a5 105 void AES_CMAC_Final(uint8_t digest[AES_CMAC_DIGEST_LENGTH], AES_CMAC_CTX *ctx)
mluis 0:45496a70a8a5 106 {
mluis 0:45496a70a8a5 107 uint8_t K[16];
mluis 0:45496a70a8a5 108 uint8_t in[16];
mluis 0:45496a70a8a5 109 /* generate subkey K1 */
mluis 0:45496a70a8a5 110 memset1(K, '\0', 16);
mluis 0:45496a70a8a5 111
mluis 0:45496a70a8a5 112 //rijndael_encrypt(&ctx->rijndael, K, K);
mluis 0:45496a70a8a5 113
mluis 0:45496a70a8a5 114 aes_encrypt( K, K, &ctx->rijndael);
mluis 0:45496a70a8a5 115
mluis 0:45496a70a8a5 116 if (K[0] & 0x80) {
mluis 0:45496a70a8a5 117 LSHIFT(K, K);
mluis 0:45496a70a8a5 118 K[15] ^= 0x87;
mluis 0:45496a70a8a5 119 } else
mluis 0:45496a70a8a5 120 LSHIFT(K, K);
mluis 0:45496a70a8a5 121
mluis 0:45496a70a8a5 122
mluis 0:45496a70a8a5 123 if (ctx->M_n == 16) {
mluis 0:45496a70a8a5 124 /* last block was a complete block */
mluis 0:45496a70a8a5 125 XOR(K, ctx->M_last);
mluis 0:45496a70a8a5 126
mluis 0:45496a70a8a5 127 } else {
mluis 0:45496a70a8a5 128 /* generate subkey K2 */
mluis 0:45496a70a8a5 129 if (K[0] & 0x80) {
mluis 0:45496a70a8a5 130 LSHIFT(K, K);
mluis 0:45496a70a8a5 131 K[15] ^= 0x87;
mluis 0:45496a70a8a5 132 } else
mluis 0:45496a70a8a5 133 LSHIFT(K, K);
mluis 0:45496a70a8a5 134
mluis 0:45496a70a8a5 135 /* padding(M_last) */
mluis 0:45496a70a8a5 136 ctx->M_last[ctx->M_n] = 0x80;
mluis 0:45496a70a8a5 137 while (++ctx->M_n < 16)
mluis 0:45496a70a8a5 138 ctx->M_last[ctx->M_n] = 0;
mluis 0:45496a70a8a5 139
mluis 0:45496a70a8a5 140 XOR(K, ctx->M_last);
mluis 0:45496a70a8a5 141
mluis 0:45496a70a8a5 142
mluis 0:45496a70a8a5 143 }
mluis 0:45496a70a8a5 144 XOR(ctx->M_last, ctx->X);
mluis 0:45496a70a8a5 145
mluis 0:45496a70a8a5 146 //rijndael_encrypt(&ctx->rijndael, ctx->X, digest);
mluis 0:45496a70a8a5 147
mluis 0:45496a70a8a5 148 memcpy1(in, &ctx->X[0], 16); //Bestela ez du ondo iten
mluis 0:45496a70a8a5 149 aes_encrypt(in, digest, &ctx->rijndael);
mluis 0:45496a70a8a5 150 memset1(K, 0, sizeof K);
mluis 0:45496a70a8a5 151
mluis 0:45496a70a8a5 152 }
mluis 0:45496a70a8a5 153