Terence Huang / LoRaWAN-SX1276-Light

light sensor

Dependencies:   X_NUCLEO_IKS01A1 LoRaWAN-lib SX1276Lib mbed

Fork of LoRaWAN-SX1276-Application-Demo by Uttam Bhat

system/crypto/cmac.cpp@6:25f847c99aa2, 2017-09-09 (annotated)

Committer:
ubhat
Date:
Sat Sep 09 00:26:19 2017 +0000
Revision:
6:25f847c99aa2
Parent:
0:42863a11464a 
Changed packet format to Senet Packet Format for numeric stream on M2X

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ubhat 0:42863a11464a 1 /**************************************************************************
ubhat 0:42863a11464a 2 Copyright (C) 2009 Lander Casado, Philippas Tsigas
ubhat 0:42863a11464a 3
ubhat 0:42863a11464a 4 All rights reserved.
ubhat 0:42863a11464a 5
ubhat 0:42863a11464a 6 Permission is hereby granted, free of charge, to any person obtaining
ubhat 0:42863a11464a 7 a copy of this software and associated documentation files
ubhat 0:42863a11464a 8 (the "Software"), to deal with the Software without restriction, including
ubhat 0:42863a11464a 9 without limitation the rights to use, copy, modify, merge, publish,
ubhat 0:42863a11464a 10 distribute, sublicense, and/or sell copies of the Software, and to
ubhat 0:42863a11464a 11 permit persons to whom the Software is furnished to do so, subject to
ubhat 0:42863a11464a 12 the following conditions:
ubhat 0:42863a11464a 13
ubhat 0:42863a11464a 14 Redistributions of source code must retain the above copyright notice,
ubhat 0:42863a11464a 15 this list of conditions and the following disclaimers. Redistributions in
ubhat 0:42863a11464a 16 binary form must reproduce the above copyright notice, this list of
ubhat 0:42863a11464a 17 conditions and the following disclaimers in the documentation and/or
ubhat 0:42863a11464a 18 other materials provided with the distribution.
ubhat 0:42863a11464a 19
ubhat 0:42863a11464a 20 In no event shall the authors or copyright holders be liable for any special,
ubhat 0:42863a11464a 21 incidental, indirect or consequential damages of any kind, or any damages
ubhat 0:42863a11464a 22 whatsoever resulting from loss of use, data or profits, whether or not
ubhat 0:42863a11464a 23 advised of the possibility of damage, and on any theory of liability,
ubhat 0:42863a11464a 24 arising out of or in connection with the use or performance of this software.
ubhat 0:42863a11464a 25
ubhat 0:42863a11464a 26 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
ubhat 0:42863a11464a 27 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
ubhat 0:42863a11464a 28 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
ubhat 0:42863a11464a 29 CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
ubhat 0:42863a11464a 30 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
ubhat 0:42863a11464a 31 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
ubhat 0:42863a11464a 32 DEALINGS WITH THE SOFTWARE
ubhat 0:42863a11464a 33
ubhat 0:42863a11464a 34 *****************************************************************************/
ubhat 0:42863a11464a 35 //#include <sys/param.h>
ubhat 0:42863a11464a 36 //#include <sys/systm.h>
ubhat 0:42863a11464a 37 #include <stdint.h>
ubhat 0:42863a11464a 38 #include "aes.h"
ubhat 0:42863a11464a 39 #include "cmac.h"
ubhat 0:42863a11464a 40 #include "utilities.h"
ubhat 0:42863a11464a 41
ubhat 0:42863a11464a 42 #define LSHIFT(v, r) do { \
ubhat 0:42863a11464a 43 int32_t i; \
ubhat 0:42863a11464a 44 for (i = 0; i < 15; i++) \
ubhat 0:42863a11464a 45 (r)[i] = (v)[i] << 1 | (v)[i + 1] >> 7; \
ubhat 0:42863a11464a 46 (r)[15] = (v)[15] << 1; \
ubhat 0:42863a11464a 47 } while (0)
ubhat 0:42863a11464a 48
ubhat 0:42863a11464a 49 #define XOR(v, r) do { \
ubhat 0:42863a11464a 50 int32_t i; \
ubhat 0:42863a11464a 51 for (i = 0; i < 16; i++) \
ubhat 0:42863a11464a 52 { \
ubhat 0:42863a11464a 53 (r)[i] = (r)[i] ^ (v)[i]; \
ubhat 0:42863a11464a 54 } \
ubhat 0:42863a11464a 55 } while (0) \
ubhat 0:42863a11464a 56
ubhat 0:42863a11464a 57
ubhat 0:42863a11464a 58 void AES_CMAC_Init(AES_CMAC_CTX *ctx)
ubhat 0:42863a11464a 59 {
ubhat 0:42863a11464a 60 memset1(ctx->X, 0, sizeof ctx->X);
ubhat 0:42863a11464a 61 ctx->M_n = 0;
ubhat 0:42863a11464a 62 memset1(ctx->rijndael.ksch, '\0', 240);
ubhat 0:42863a11464a 63 }
ubhat 0:42863a11464a 64
ubhat 0:42863a11464a 65 void AES_CMAC_SetKey(AES_CMAC_CTX *ctx, const uint8_t key[AES_CMAC_KEY_LENGTH])
ubhat 0:42863a11464a 66 {
ubhat 0:42863a11464a 67 //rijndael_set_key_enc_only(&ctx->rijndael, key, 128);
ubhat 0:42863a11464a 68 aes_set_key( key, AES_CMAC_KEY_LENGTH, &ctx->rijndael);
ubhat 0:42863a11464a 69 }
ubhat 0:42863a11464a 70
ubhat 0:42863a11464a 71 void AES_CMAC_Update(AES_CMAC_CTX *ctx, const uint8_t *data, uint32_t len)
ubhat 0:42863a11464a 72 {
ubhat 0:42863a11464a 73 uint32_t mlen;
ubhat 0:42863a11464a 74 uint8_t in[16];
ubhat 0:42863a11464a 75
ubhat 0:42863a11464a 76 if (ctx->M_n > 0) {
ubhat 0:42863a11464a 77 mlen = MIN(16 - ctx->M_n, len);
ubhat 0:42863a11464a 78 memcpy1(ctx->M_last + ctx->M_n, data, mlen);
ubhat 0:42863a11464a 79 ctx->M_n += mlen;
ubhat 0:42863a11464a 80 if (ctx->M_n < 16 || len == mlen)
ubhat 0:42863a11464a 81 return;
ubhat 0:42863a11464a 82 XOR(ctx->M_last, ctx->X);
ubhat 0:42863a11464a 83 //rijndael_encrypt(&ctx->rijndael, ctx->X, ctx->X);
ubhat 0:42863a11464a 84 aes_encrypt( ctx->X, ctx->X, &ctx->rijndael);
ubhat 0:42863a11464a 85 data += mlen;
ubhat 0:42863a11464a 86 len -= mlen;
ubhat 0:42863a11464a 87 }
ubhat 0:42863a11464a 88 while (len > 16) { /* not last block */
ubhat 0:42863a11464a 89
ubhat 0:42863a11464a 90 XOR(data, ctx->X);
ubhat 0:42863a11464a 91 //rijndael_encrypt(&ctx->rijndael, ctx->X, ctx->X);
ubhat 0:42863a11464a 92
ubhat 0:42863a11464a 93 memcpy1(in, &ctx->X[0], 16); //Bestela ez du ondo iten
ubhat 0:42863a11464a 94 aes_encrypt( in, in, &ctx->rijndael);
ubhat 0:42863a11464a 95 memcpy1(&ctx->X[0], in, 16);
ubhat 0:42863a11464a 96
ubhat 0:42863a11464a 97 data += 16;
ubhat 0:42863a11464a 98 len -= 16;
ubhat 0:42863a11464a 99 }
ubhat 0:42863a11464a 100 /* potential last block, save it */
ubhat 0:42863a11464a 101 memcpy1(ctx->M_last, data, len);
ubhat 0:42863a11464a 102 ctx->M_n = len;
ubhat 0:42863a11464a 103 }
ubhat 0:42863a11464a 104
ubhat 0:42863a11464a 105 void AES_CMAC_Final(uint8_t digest[AES_CMAC_DIGEST_LENGTH], AES_CMAC_CTX *ctx)
ubhat 0:42863a11464a 106 {
ubhat 0:42863a11464a 107 uint8_t K[16];
ubhat 0:42863a11464a 108 uint8_t in[16];
ubhat 0:42863a11464a 109 /* generate subkey K1 */
ubhat 0:42863a11464a 110 memset1(K, '\0', 16);
ubhat 0:42863a11464a 111
ubhat 0:42863a11464a 112 //rijndael_encrypt(&ctx->rijndael, K, K);
ubhat 0:42863a11464a 113
ubhat 0:42863a11464a 114 aes_encrypt( K, K, &ctx->rijndael);
ubhat 0:42863a11464a 115
ubhat 0:42863a11464a 116 if (K[0] & 0x80) {
ubhat 0:42863a11464a 117 LSHIFT(K, K);
ubhat 0:42863a11464a 118 K[15] ^= 0x87;
ubhat 0:42863a11464a 119 } else
ubhat 0:42863a11464a 120 LSHIFT(K, K);
ubhat 0:42863a11464a 121
ubhat 0:42863a11464a 122
ubhat 0:42863a11464a 123 if (ctx->M_n == 16) {
ubhat 0:42863a11464a 124 /* last block was a complete block */
ubhat 0:42863a11464a 125 XOR(K, ctx->M_last);
ubhat 0:42863a11464a 126
ubhat 0:42863a11464a 127 } else {
ubhat 0:42863a11464a 128 /* generate subkey K2 */
ubhat 0:42863a11464a 129 if (K[0] & 0x80) {
ubhat 0:42863a11464a 130 LSHIFT(K, K);
ubhat 0:42863a11464a 131 K[15] ^= 0x87;
ubhat 0:42863a11464a 132 } else
ubhat 0:42863a11464a 133 LSHIFT(K, K);
ubhat 0:42863a11464a 134
ubhat 0:42863a11464a 135 /* padding(M_last) */
ubhat 0:42863a11464a 136 ctx->M_last[ctx->M_n] = 0x80;
ubhat 0:42863a11464a 137 while (++ctx->M_n < 16)
ubhat 0:42863a11464a 138 ctx->M_last[ctx->M_n] = 0;
ubhat 0:42863a11464a 139
ubhat 0:42863a11464a 140 XOR(K, ctx->M_last);
ubhat 0:42863a11464a 141
ubhat 0:42863a11464a 142
ubhat 0:42863a11464a 143 }
ubhat 0:42863a11464a 144 XOR(ctx->M_last, ctx->X);
ubhat 0:42863a11464a 145
ubhat 0:42863a11464a 146 //rijndael_encrypt(&ctx->rijndael, ctx->X, digest);
ubhat 0:42863a11464a 147
ubhat 0:42863a11464a 148 memcpy1(in, &ctx->X[0], 16); //Bestela ez du ondo iten
ubhat 0:42863a11464a 149 aes_encrypt(in, digest, &ctx->rijndael);
ubhat 0:42863a11464a 150 memset1(K, 0, sizeof K);
ubhat 0:42863a11464a 151
ubhat 0:42863a11464a 152 }
ubhat 0:42863a11464a 153