Semtech / LoRaWAN-lib

LoRaWAN MAC layer implementation

Dependents:   LoRaWAN-demo-72_tjm LoRaWAN-demo-72_jlc LoRaWAN-demo-elmo frdm_LoRa_Connect_Woodstream_Demo_tjm ... more

LoRAWAN-lib is a port of the GitHub LoRaMac-node LoRaWAN MAC layer implementation.

This library depends on the SX1276Lib or SX1272Lib radio drivers depending on the used mbed component shield.

This library depends also on some cryptographic helper functions as well as helper functions for the timers management. These can be found on the example projects under the system directory.

The example projects are:

  1. LoRaWAN-demo-72
  2. LoRaWAN-demo-76
  3. LoRaWAN-demo-NAMote72

The LoRaWAN specification specifies different ISM bands operating parameters. These are all implemented under the LoRaMac-board.h file.

In order to select which band to use, please change line 24 of board.h file provided on the examples projects as follows:


EU868

board.h

#define USE_BAND_868


US915

board.h

#define USE_BAND_915


US915 - Hybrid

board.h

#define USE_BAND_915_HYBRID


CN780

board.h

#define USE_BAND_780


EU433

board.h

#define USE_BAND_433

crypto/cmac.cpp@0:91d1a7783bb9, 2015-10-20 (annotated)

Committer:
mluis
Date:
Tue Oct 20 13:21:26 2015 +0000
Revision:
0:91d1a7783bb9
Library creation synchronized with GitHub LoRaMac-node v3.4 (https://github.com/Lora-net/LoRaMac-node)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mluis 0:91d1a7783bb9 1 /**************************************************************************
mluis 0:91d1a7783bb9 2 Copyright (C) 2009 Lander Casado, Philippas Tsigas
mluis 0:91d1a7783bb9 3
mluis 0:91d1a7783bb9 4 All rights reserved.
mluis 0:91d1a7783bb9 5
mluis 0:91d1a7783bb9 6 Permission is hereby granted, free of charge, to any person obtaining
mluis 0:91d1a7783bb9 7 a copy of this software and associated documentation files
mluis 0:91d1a7783bb9 8 (the "Software"), to deal with the Software without restriction, including
mluis 0:91d1a7783bb9 9 without limitation the rights to use, copy, modify, merge, publish,
mluis 0:91d1a7783bb9 10 distribute, sublicense, and/or sell copies of the Software, and to
mluis 0:91d1a7783bb9 11 permit persons to whom the Software is furnished to do so, subject to
mluis 0:91d1a7783bb9 12 the following conditions:
mluis 0:91d1a7783bb9 13
mluis 0:91d1a7783bb9 14 Redistributions of source code must retain the above copyright notice,
mluis 0:91d1a7783bb9 15 this list of conditions and the following disclaimers. Redistributions in
mluis 0:91d1a7783bb9 16 binary form must reproduce the above copyright notice, this list of
mluis 0:91d1a7783bb9 17 conditions and the following disclaimers in the documentation and/or
mluis 0:91d1a7783bb9 18 other materials provided with the distribution.
mluis 0:91d1a7783bb9 19
mluis 0:91d1a7783bb9 20 In no event shall the authors or copyright holders be liable for any special,
mluis 0:91d1a7783bb9 21 incidental, indirect or consequential damages of any kind, or any damages
mluis 0:91d1a7783bb9 22 whatsoever resulting from loss of use, data or profits, whether or not
mluis 0:91d1a7783bb9 23 advised of the possibility of damage, and on any theory of liability,
mluis 0:91d1a7783bb9 24 arising out of or in connection with the use or performance of this software.
mluis 0:91d1a7783bb9 25
mluis 0:91d1a7783bb9 26 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
mluis 0:91d1a7783bb9 27 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mluis 0:91d1a7783bb9 28 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mluis 0:91d1a7783bb9 29 CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mluis 0:91d1a7783bb9 30 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
mluis 0:91d1a7783bb9 31 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
mluis 0:91d1a7783bb9 32 DEALINGS WITH THE SOFTWARE
mluis 0:91d1a7783bb9 33
mluis 0:91d1a7783bb9 34 *****************************************************************************/
mluis 0:91d1a7783bb9 35 //#include <sys/param.h>
mluis 0:91d1a7783bb9 36 //#include <sys/systm.h>
mluis 0:91d1a7783bb9 37 #include "mbed.h"
mluis 0:91d1a7783bb9 38 #include "aes.h"
mluis 0:91d1a7783bb9 39 #include "cmac.h"
mluis 0:91d1a7783bb9 40 #include "utilities.h"
mluis 0:91d1a7783bb9 41
mluis 0:91d1a7783bb9 42 #define LSHIFT(v, r) do { \
mluis 0:91d1a7783bb9 43 int i; \
mluis 0:91d1a7783bb9 44 for (i = 0; i < 15; i++) \
mluis 0:91d1a7783bb9 45 (r)[i] = (v)[i] << 1 | (v)[i + 1] >> 7; \
mluis 0:91d1a7783bb9 46 (r)[15] = (v)[15] << 1; \
mluis 0:91d1a7783bb9 47 } while (0)
mluis 0:91d1a7783bb9 48
mluis 0:91d1a7783bb9 49 #define XOR(v, r) do { \
mluis 0:91d1a7783bb9 50 int i; \
mluis 0:91d1a7783bb9 51 for (i = 0; i < 16; i++) \
mluis 0:91d1a7783bb9 52 { \
mluis 0:91d1a7783bb9 53 (r)[i] = (r)[i] ^ (v)[i]; \
mluis 0:91d1a7783bb9 54 } \
mluis 0:91d1a7783bb9 55 } while (0) \
mluis 0:91d1a7783bb9 56
mluis 0:91d1a7783bb9 57
mluis 0:91d1a7783bb9 58 //#define MIN(a,b) (((a)<(b))?(a):(b))
mluis 0:91d1a7783bb9 59
mluis 0:91d1a7783bb9 60 /*
mluis 0:91d1a7783bb9 61 void memcpy1( u_int8_t *dst, const u_int8_t *src, u_int size );
mluis 0:91d1a7783bb9 62 void memset1( u_int8_t *dst, u_int8_t value, u_int size );
mluis 0:91d1a7783bb9 63 */
mluis 0:91d1a7783bb9 64
mluis 0:91d1a7783bb9 65 /*
mluis 0:91d1a7783bb9 66 static void memcpy1( uint_8t * d, const uint_8t *s, uint_8t nn )
mluis 0:91d1a7783bb9 67 {
mluis 0:91d1a7783bb9 68 while( nn-- )
mluis 0:91d1a7783bb9 69 // *((uint_8t*)d)++ = *((uint_8t*)s)++;
mluis 0:91d1a7783bb9 70 *d++ = *s++;
mluis 0:91d1a7783bb9 71 }
mluis 0:91d1a7783bb9 72
mluis 0:91d1a7783bb9 73 static void memset1( uint_8t * d, uint_8t a, uint_8t nn )
mluis 0:91d1a7783bb9 74 {
mluis 0:91d1a7783bb9 75 while( nn-- )
mluis 0:91d1a7783bb9 76 // *((uint_8t*)d)++ = *((uint_8t*)s)++;
mluis 0:91d1a7783bb9 77 *d++ = a;
mluis 0:91d1a7783bb9 78 }
mluis 0:91d1a7783bb9 79 */
mluis 0:91d1a7783bb9 80
mluis 0:91d1a7783bb9 81 void AES_CMAC_Init(AES_CMAC_CTX *ctx)
mluis 0:91d1a7783bb9 82 {
mluis 0:91d1a7783bb9 83 memset1(ctx->X, 0, sizeof ctx->X);
mluis 0:91d1a7783bb9 84 ctx->M_n = 0;
mluis 0:91d1a7783bb9 85 memset1(ctx->rijndael.ksch, '\0', 240);
mluis 0:91d1a7783bb9 86 }
mluis 0:91d1a7783bb9 87
mluis 0:91d1a7783bb9 88 void AES_CMAC_SetKey(AES_CMAC_CTX *ctx, const u_int8_t key[AES_CMAC_KEY_LENGTH])
mluis 0:91d1a7783bb9 89 {
mluis 0:91d1a7783bb9 90 //rijndael_set_key_enc_only(&ctx->rijndael, key, 128);
mluis 0:91d1a7783bb9 91 aes_set_key( key, AES_CMAC_KEY_LENGTH, &ctx->rijndael);
mluis 0:91d1a7783bb9 92 }
mluis 0:91d1a7783bb9 93
mluis 0:91d1a7783bb9 94 void AES_CMAC_Update(AES_CMAC_CTX *ctx, const u_int8_t *data, u_int len)
mluis 0:91d1a7783bb9 95 {
mluis 0:91d1a7783bb9 96 u_int mlen;
mluis 0:91d1a7783bb9 97 unsigned char in[16];
mluis 0:91d1a7783bb9 98
mluis 0:91d1a7783bb9 99 if (ctx->M_n > 0) {
mluis 0:91d1a7783bb9 100 mlen = MIN(16 - ctx->M_n, len);
mluis 0:91d1a7783bb9 101 memcpy1(ctx->M_last + ctx->M_n, ( uint8_t* )data, mlen);
mluis 0:91d1a7783bb9 102 ctx->M_n += mlen;
mluis 0:91d1a7783bb9 103 if (ctx->M_n < 16 || len == mlen)
mluis 0:91d1a7783bb9 104 return;
mluis 0:91d1a7783bb9 105 XOR(ctx->M_last, ctx->X);
mluis 0:91d1a7783bb9 106 //rijndael_encrypt(&ctx->rijndael, ctx->X, ctx->X);
mluis 0:91d1a7783bb9 107 aes_encrypt( ctx->X, ctx->X, &ctx->rijndael);
mluis 0:91d1a7783bb9 108 data += mlen;
mluis 0:91d1a7783bb9 109 len -= mlen;
mluis 0:91d1a7783bb9 110 }
mluis 0:91d1a7783bb9 111 while (len > 16) { /* not last block */
mluis 0:91d1a7783bb9 112
mluis 0:91d1a7783bb9 113 XOR(data, ctx->X);
mluis 0:91d1a7783bb9 114 //rijndael_encrypt(&ctx->rijndael, ctx->X, ctx->X);
mluis 0:91d1a7783bb9 115
mluis 0:91d1a7783bb9 116 memcpy1(in, &ctx->X[0], 16); //Bestela ez du ondo iten
mluis 0:91d1a7783bb9 117 aes_encrypt( in, in, &ctx->rijndael);
mluis 0:91d1a7783bb9 118 memcpy1(&ctx->X[0], in, 16);
mluis 0:91d1a7783bb9 119
mluis 0:91d1a7783bb9 120 data += 16;
mluis 0:91d1a7783bb9 121 len -= 16;
mluis 0:91d1a7783bb9 122 }
mluis 0:91d1a7783bb9 123 /* potential last block, save it */
mluis 0:91d1a7783bb9 124 memcpy1(ctx->M_last, ( uint8_t* )data, len);
mluis 0:91d1a7783bb9 125 ctx->M_n = len;
mluis 0:91d1a7783bb9 126 }
mluis 0:91d1a7783bb9 127
mluis 0:91d1a7783bb9 128 void AES_CMAC_Final(u_int8_t digest[AES_CMAC_DIGEST_LENGTH], AES_CMAC_CTX *ctx)
mluis 0:91d1a7783bb9 129 {
mluis 0:91d1a7783bb9 130 u_int8_t K[16];
mluis 0:91d1a7783bb9 131 unsigned char in[16];
mluis 0:91d1a7783bb9 132 /* generate subkey K1 */
mluis 0:91d1a7783bb9 133 memset1(K, '\0', 16);
mluis 0:91d1a7783bb9 134
mluis 0:91d1a7783bb9 135 //rijndael_encrypt(&ctx->rijndael, K, K);
mluis 0:91d1a7783bb9 136
mluis 0:91d1a7783bb9 137 aes_encrypt( K, K, &ctx->rijndael);
mluis 0:91d1a7783bb9 138
mluis 0:91d1a7783bb9 139 if (K[0] & 0x80) {
mluis 0:91d1a7783bb9 140 LSHIFT(K, K);
mluis 0:91d1a7783bb9 141 K[15] ^= 0x87;
mluis 0:91d1a7783bb9 142 } else
mluis 0:91d1a7783bb9 143 LSHIFT(K, K);
mluis 0:91d1a7783bb9 144
mluis 0:91d1a7783bb9 145
mluis 0:91d1a7783bb9 146 if (ctx->M_n == 16) {
mluis 0:91d1a7783bb9 147 /* last block was a complete block */
mluis 0:91d1a7783bb9 148 XOR(K, ctx->M_last);
mluis 0:91d1a7783bb9 149
mluis 0:91d1a7783bb9 150 } else {
mluis 0:91d1a7783bb9 151 /* generate subkey K2 */
mluis 0:91d1a7783bb9 152 if (K[0] & 0x80) {
mluis 0:91d1a7783bb9 153 LSHIFT(K, K);
mluis 0:91d1a7783bb9 154 K[15] ^= 0x87;
mluis 0:91d1a7783bb9 155 } else
mluis 0:91d1a7783bb9 156 LSHIFT(K, K);
mluis 0:91d1a7783bb9 157
mluis 0:91d1a7783bb9 158 /* padding(M_last) */
mluis 0:91d1a7783bb9 159 ctx->M_last[ctx->M_n] = 0x80;
mluis 0:91d1a7783bb9 160 while (++ctx->M_n < 16)
mluis 0:91d1a7783bb9 161 ctx->M_last[ctx->M_n] = 0;
mluis 0:91d1a7783bb9 162
mluis 0:91d1a7783bb9 163 XOR(K, ctx->M_last);
mluis 0:91d1a7783bb9 164
mluis 0:91d1a7783bb9 165
mluis 0:91d1a7783bb9 166 }
mluis 0:91d1a7783bb9 167 XOR(ctx->M_last, ctx->X);
mluis 0:91d1a7783bb9 168
mluis 0:91d1a7783bb9 169 //rijndael_encrypt(&ctx->rijndael, ctx->X, digest);
mluis 0:91d1a7783bb9 170
mluis 0:91d1a7783bb9 171 memcpy1(in, &ctx->X[0], 16); //Bestela ez du ondo iten
mluis 0:91d1a7783bb9 172 aes_encrypt(in, digest, &ctx->rijndael);
mluis 0:91d1a7783bb9 173 memset1(K, 0, sizeof K);
mluis 0:91d1a7783bb9 174
mluis 0:91d1a7783bb9 175 }
mluis 0:91d1a7783bb9 176