Uttam Bhat / LoRaWAN-NAMote72-Application-Demo-Test

Test Fork

Dependencies:   LoRaWAN-lib SX1272Lib lib_gps lib_mma8451q lib_mpl3115a2 mbed

Fork of LoRaWAN-NAMote72-Application-Demo by Semtech

system/crypto/cmac.cpp@12:504203733f11, 2016-08-05 (annotated)

Committer:
ubhat
Date:
Fri Aug 05 20:45:12 2016 +0000
Revision:
12:504203733f11
Parent:
2:d119a85c793c 
Revert to Revision 9

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ubhat 2:d119a85c793c 1 /**************************************************************************
ubhat 2:d119a85c793c 2 Copyright (C) 2009 Lander Casado, Philippas Tsigas
ubhat 2:d119a85c793c 3
ubhat 2:d119a85c793c 4 All rights reserved.
ubhat 2:d119a85c793c 5
ubhat 2:d119a85c793c 6 Permission is hereby granted, free of charge, to any person obtaining
ubhat 2:d119a85c793c 7 a copy of this software and associated documentation files
ubhat 2:d119a85c793c 8 (the "Software"), to deal with the Software without restriction, including
ubhat 2:d119a85c793c 9 without limitation the rights to use, copy, modify, merge, publish,
ubhat 2:d119a85c793c 10 distribute, sublicense, and/or sell copies of the Software, and to
ubhat 2:d119a85c793c 11 permit persons to whom the Software is furnished to do so, subject to
ubhat 2:d119a85c793c 12 the following conditions:
ubhat 2:d119a85c793c 13
ubhat 2:d119a85c793c 14 Redistributions of source code must retain the above copyright notice,
ubhat 2:d119a85c793c 15 this list of conditions and the following disclaimers. Redistributions in
ubhat 2:d119a85c793c 16 binary form must reproduce the above copyright notice, this list of
ubhat 2:d119a85c793c 17 conditions and the following disclaimers in the documentation and/or
ubhat 2:d119a85c793c 18 other materials provided with the distribution.
ubhat 2:d119a85c793c 19
ubhat 2:d119a85c793c 20 In no event shall the authors or copyright holders be liable for any special,
ubhat 2:d119a85c793c 21 incidental, indirect or consequential damages of any kind, or any damages
ubhat 2:d119a85c793c 22 whatsoever resulting from loss of use, data or profits, whether or not
ubhat 2:d119a85c793c 23 advised of the possibility of damage, and on any theory of liability,
ubhat 2:d119a85c793c 24 arising out of or in connection with the use or performance of this software.
ubhat 2:d119a85c793c 25
ubhat 2:d119a85c793c 26 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
ubhat 2:d119a85c793c 27 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
ubhat 2:d119a85c793c 28 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
ubhat 2:d119a85c793c 29 CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
ubhat 2:d119a85c793c 30 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
ubhat 2:d119a85c793c 31 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
ubhat 2:d119a85c793c 32 DEALINGS WITH THE SOFTWARE
ubhat 2:d119a85c793c 33
ubhat 2:d119a85c793c 34 *****************************************************************************/
ubhat 2:d119a85c793c 35 //#include <sys/param.h>
ubhat 2:d119a85c793c 36 //#include <sys/systm.h>
ubhat 2:d119a85c793c 37 #include <stdint.h>
ubhat 2:d119a85c793c 38 #include "aes.h"
ubhat 2:d119a85c793c 39 #include "cmac.h"
ubhat 2:d119a85c793c 40 #include "utilities.h"
ubhat 2:d119a85c793c 41
ubhat 2:d119a85c793c 42 #define LSHIFT(v, r) do { \
ubhat 2:d119a85c793c 43 int32_t i; \
ubhat 2:d119a85c793c 44 for (i = 0; i < 15; i++) \
ubhat 2:d119a85c793c 45 (r)[i] = (v)[i] << 1 | (v)[i + 1] >> 7; \
ubhat 2:d119a85c793c 46 (r)[15] = (v)[15] << 1; \
ubhat 2:d119a85c793c 47 } while (0)
ubhat 2:d119a85c793c 48
ubhat 2:d119a85c793c 49 #define XOR(v, r) do { \
ubhat 2:d119a85c793c 50 int32_t i; \
ubhat 2:d119a85c793c 51 for (i = 0; i < 16; i++) \
ubhat 2:d119a85c793c 52 { \
ubhat 2:d119a85c793c 53 (r)[i] = (r)[i] ^ (v)[i]; \
ubhat 2:d119a85c793c 54 } \
ubhat 2:d119a85c793c 55 } while (0) \
ubhat 2:d119a85c793c 56
ubhat 2:d119a85c793c 57
ubhat 2:d119a85c793c 58 void AES_CMAC_Init(AES_CMAC_CTX *ctx)
ubhat 2:d119a85c793c 59 {
ubhat 2:d119a85c793c 60 memset1(ctx->X, 0, sizeof ctx->X);
ubhat 2:d119a85c793c 61 ctx->M_n = 0;
ubhat 2:d119a85c793c 62 memset1(ctx->rijndael.ksch, '\0', 240);
ubhat 2:d119a85c793c 63 }
ubhat 2:d119a85c793c 64
ubhat 2:d119a85c793c 65 void AES_CMAC_SetKey(AES_CMAC_CTX *ctx, const uint8_t key[AES_CMAC_KEY_LENGTH])
ubhat 2:d119a85c793c 66 {
ubhat 2:d119a85c793c 67 //rijndael_set_key_enc_only(&ctx->rijndael, key, 128);
ubhat 2:d119a85c793c 68 aes_set_key( key, AES_CMAC_KEY_LENGTH, &ctx->rijndael);
ubhat 2:d119a85c793c 69 }
ubhat 2:d119a85c793c 70
ubhat 2:d119a85c793c 71 void AES_CMAC_Update(AES_CMAC_CTX *ctx, const uint8_t *data, uint32_t len)
ubhat 2:d119a85c793c 72 {
ubhat 2:d119a85c793c 73 uint32_t mlen;
ubhat 2:d119a85c793c 74 uint8_t in[16];
ubhat 2:d119a85c793c 75
ubhat 2:d119a85c793c 76 if (ctx->M_n > 0) {
ubhat 2:d119a85c793c 77 mlen = MIN(16 - ctx->M_n, len);
ubhat 2:d119a85c793c 78 memcpy1(ctx->M_last + ctx->M_n, data, mlen);
ubhat 2:d119a85c793c 79 ctx->M_n += mlen;
ubhat 2:d119a85c793c 80 if (ctx->M_n < 16 || len == mlen)
ubhat 2:d119a85c793c 81 return;
ubhat 2:d119a85c793c 82 XOR(ctx->M_last, ctx->X);
ubhat 2:d119a85c793c 83 //rijndael_encrypt(&ctx->rijndael, ctx->X, ctx->X);
ubhat 2:d119a85c793c 84 aes_encrypt( ctx->X, ctx->X, &ctx->rijndael);
ubhat 2:d119a85c793c 85 data += mlen;
ubhat 2:d119a85c793c 86 len -= mlen;
ubhat 2:d119a85c793c 87 }
ubhat 2:d119a85c793c 88 while (len > 16) { /* not last block */
ubhat 2:d119a85c793c 89
ubhat 2:d119a85c793c 90 XOR(data, ctx->X);
ubhat 2:d119a85c793c 91 //rijndael_encrypt(&ctx->rijndael, ctx->X, ctx->X);
ubhat 2:d119a85c793c 92
ubhat 2:d119a85c793c 93 memcpy1(in, &ctx->X[0], 16); //Bestela ez du ondo iten
ubhat 2:d119a85c793c 94 aes_encrypt( in, in, &ctx->rijndael);
ubhat 2:d119a85c793c 95 memcpy1(&ctx->X[0], in, 16);
ubhat 2:d119a85c793c 96
ubhat 2:d119a85c793c 97 data += 16;
ubhat 2:d119a85c793c 98 len -= 16;
ubhat 2:d119a85c793c 99 }
ubhat 2:d119a85c793c 100 /* potential last block, save it */
ubhat 2:d119a85c793c 101 memcpy1(ctx->M_last, data, len);
ubhat 2:d119a85c793c 102 ctx->M_n = len;
ubhat 2:d119a85c793c 103 }
ubhat 2:d119a85c793c 104
ubhat 2:d119a85c793c 105 void AES_CMAC_Final(uint8_t digest[AES_CMAC_DIGEST_LENGTH], AES_CMAC_CTX *ctx)
ubhat 2:d119a85c793c 106 {
ubhat 2:d119a85c793c 107 uint8_t K[16];
ubhat 2:d119a85c793c 108 uint8_t in[16];
ubhat 2:d119a85c793c 109 /* generate subkey K1 */
ubhat 2:d119a85c793c 110 memset1(K, '\0', 16);
ubhat 2:d119a85c793c 111
ubhat 2:d119a85c793c 112 //rijndael_encrypt(&ctx->rijndael, K, K);
ubhat 2:d119a85c793c 113
ubhat 2:d119a85c793c 114 aes_encrypt( K, K, &ctx->rijndael);
ubhat 2:d119a85c793c 115
ubhat 2:d119a85c793c 116 if (K[0] & 0x80) {
ubhat 2:d119a85c793c 117 LSHIFT(K, K);
ubhat 2:d119a85c793c 118 K[15] ^= 0x87;
ubhat 2:d119a85c793c 119 } else
ubhat 2:d119a85c793c 120 LSHIFT(K, K);
ubhat 2:d119a85c793c 121
ubhat 2:d119a85c793c 122
ubhat 2:d119a85c793c 123 if (ctx->M_n == 16) {
ubhat 2:d119a85c793c 124 /* last block was a complete block */
ubhat 2:d119a85c793c 125 XOR(K, ctx->M_last);
ubhat 2:d119a85c793c 126
ubhat 2:d119a85c793c 127 } else {
ubhat 2:d119a85c793c 128 /* generate subkey K2 */
ubhat 2:d119a85c793c 129 if (K[0] & 0x80) {
ubhat 2:d119a85c793c 130 LSHIFT(K, K);
ubhat 2:d119a85c793c 131 K[15] ^= 0x87;
ubhat 2:d119a85c793c 132 } else
ubhat 2:d119a85c793c 133 LSHIFT(K, K);
ubhat 2:d119a85c793c 134
ubhat 2:d119a85c793c 135 /* padding(M_last) */
ubhat 2:d119a85c793c 136 ctx->M_last[ctx->M_n] = 0x80;
ubhat 2:d119a85c793c 137 while (++ctx->M_n < 16)
ubhat 2:d119a85c793c 138 ctx->M_last[ctx->M_n] = 0;
ubhat 2:d119a85c793c 139
ubhat 2:d119a85c793c 140 XOR(K, ctx->M_last);
ubhat 2:d119a85c793c 141
ubhat 2:d119a85c793c 142
ubhat 2:d119a85c793c 143 }
ubhat 2:d119a85c793c 144 XOR(ctx->M_last, ctx->X);
ubhat 2:d119a85c793c 145
ubhat 2:d119a85c793c 146 //rijndael_encrypt(&ctx->rijndael, ctx->X, digest);
ubhat 2:d119a85c793c 147
ubhat 2:d119a85c793c 148 memcpy1(in, &ctx->X[0], 16); //Bestela ez du ondo iten
ubhat 2:d119a85c793c 149 aes_encrypt(in, digest, &ctx->rijndael);
ubhat 2:d119a85c793c 150 memset1(K, 0, sizeof K);
ubhat 2:d119a85c793c 151
ubhat 2:d119a85c793c 152 }
ubhat 2:d119a85c793c 153