Christopher De Bank / Mbed 2 deprecated simple-demo-76_revised_20171208

20171208

Dependencies:   mbed simple-demo-76 LoRaWAN-lib_20171208 SX1276Lib_20171208

Fork of simple-demo-76 by Josh Curry

system/crypto/cmac.cpp@11:6fdaaa5dc69a, 2017-12-08 (annotated)

Committer:
cdebank
Date:
Fri Dec 08 14:23:38 2017 +0000
Revision:
11:6fdaaa5dc69a
Parent:
5:1e9f6a365854 
20171208

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mluis 1:352f608c3337 1 /**************************************************************************
mluis 1:352f608c3337 2 Copyright (C) 2009 Lander Casado, Philippas Tsigas
mluis 1:352f608c3337 3
mluis 1:352f608c3337 4 All rights reserved.
mluis 1:352f608c3337 5
mluis 1:352f608c3337 6 Permission is hereby granted, free of charge, to any person obtaining
mluis 1:352f608c3337 7 a copy of this software and associated documentation files
mluis 1:352f608c3337 8 (the "Software"), to deal with the Software without restriction, including
mluis 1:352f608c3337 9 without limitation the rights to use, copy, modify, merge, publish,
mluis 1:352f608c3337 10 distribute, sublicense, and/or sell copies of the Software, and to
mluis 1:352f608c3337 11 permit persons to whom the Software is furnished to do so, subject to
mluis 1:352f608c3337 12 the following conditions:
mluis 1:352f608c3337 13
mluis 1:352f608c3337 14 Redistributions of source code must retain the above copyright notice,
mluis 1:352f608c3337 15 this list of conditions and the following disclaimers. Redistributions in
mluis 1:352f608c3337 16 binary form must reproduce the above copyright notice, this list of
mluis 1:352f608c3337 17 conditions and the following disclaimers in the documentation and/or
mluis 1:352f608c3337 18 other materials provided with the distribution.
mluis 1:352f608c3337 19
mluis 1:352f608c3337 20 In no event shall the authors or copyright holders be liable for any special,
mluis 1:352f608c3337 21 incidental, indirect or consequential damages of any kind, or any damages
mluis 1:352f608c3337 22 whatsoever resulting from loss of use, data or profits, whether or not
mluis 1:352f608c3337 23 advised of the possibility of damage, and on any theory of liability,
mluis 1:352f608c3337 24 arising out of or in connection with the use or performance of this software.
mluis 1:352f608c3337 25
mluis 1:352f608c3337 26 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
mluis 1:352f608c3337 27 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mluis 1:352f608c3337 28 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mluis 1:352f608c3337 29 CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mluis 1:352f608c3337 30 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
mluis 1:352f608c3337 31 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
mluis 1:352f608c3337 32 DEALINGS WITH THE SOFTWARE
mluis 1:352f608c3337 33
mluis 1:352f608c3337 34 *****************************************************************************/
mluis 1:352f608c3337 35 //#include <sys/param.h>
mluis 1:352f608c3337 36 //#include <sys/systm.h>
mluis 1:352f608c3337 37 #include <stdint.h>
mluis 1:352f608c3337 38 #include "aes.h"
mluis 1:352f608c3337 39 #include "cmac.h"
mluis 1:352f608c3337 40 #include "utilities.h"
mluis 1:352f608c3337 41
mluis 1:352f608c3337 42 #define LSHIFT(v, r) do { \
mluis 1:352f608c3337 43 int32_t i; \
mluis 1:352f608c3337 44 for (i = 0; i < 15; i++) \
mluis 1:352f608c3337 45 (r)[i] = (v)[i] << 1 | (v)[i + 1] >> 7; \
mluis 1:352f608c3337 46 (r)[15] = (v)[15] << 1; \
mluis 1:352f608c3337 47 } while (0)
mluis 1:352f608c3337 48
mluis 1:352f608c3337 49 #define XOR(v, r) do { \
mluis 1:352f608c3337 50 int32_t i; \
mluis 1:352f608c3337 51 for (i = 0; i < 16; i++) \
mluis 1:352f608c3337 52 { \
mluis 1:352f608c3337 53 (r)[i] = (r)[i] ^ (v)[i]; \
mluis 1:352f608c3337 54 } \
mluis 1:352f608c3337 55 } while (0) \
mluis 1:352f608c3337 56
mluis 1:352f608c3337 57
mluis 1:352f608c3337 58 void AES_CMAC_Init(AES_CMAC_CTX *ctx)
mluis 1:352f608c3337 59 {
mluis 1:352f608c3337 60 memset1(ctx->X, 0, sizeof ctx->X);
mluis 1:352f608c3337 61 ctx->M_n = 0;
mluis 1:352f608c3337 62 memset1(ctx->rijndael.ksch, '\0', 240);
mluis 1:352f608c3337 63 }
mluis 1:352f608c3337 64
mluis 1:352f608c3337 65 void AES_CMAC_SetKey(AES_CMAC_CTX *ctx, const uint8_t key[AES_CMAC_KEY_LENGTH])
mluis 1:352f608c3337 66 {
mluis 1:352f608c3337 67 //rijndael_set_key_enc_only(&ctx->rijndael, key, 128);
mluis 1:352f608c3337 68 aes_set_key( key, AES_CMAC_KEY_LENGTH, &ctx->rijndael);
mluis 1:352f608c3337 69 }
mluis 1:352f608c3337 70
mluis 1:352f608c3337 71 void AES_CMAC_Update(AES_CMAC_CTX *ctx, const uint8_t *data, uint32_t len)
mluis 1:352f608c3337 72 {
mluis 1:352f608c3337 73 uint32_t mlen;
mluis 1:352f608c3337 74 uint8_t in[16];
mluis 1:352f608c3337 75
mluis 1:352f608c3337 76 if (ctx->M_n > 0) {
mluis 1:352f608c3337 77 mlen = MIN(16 - ctx->M_n, len);
mluis 1:352f608c3337 78 memcpy1(ctx->M_last + ctx->M_n, data, mlen);
mluis 1:352f608c3337 79 ctx->M_n += mlen;
mluis 1:352f608c3337 80 if (ctx->M_n < 16 || len == mlen)
mluis 1:352f608c3337 81 return;
mluis 1:352f608c3337 82 XOR(ctx->M_last, ctx->X);
mluis 1:352f608c3337 83 //rijndael_encrypt(&ctx->rijndael, ctx->X, ctx->X);
mluis 1:352f608c3337 84 aes_encrypt( ctx->X, ctx->X, &ctx->rijndael);
mluis 1:352f608c3337 85 data += mlen;
mluis 1:352f608c3337 86 len -= mlen;
mluis 1:352f608c3337 87 }
mluis 1:352f608c3337 88 while (len > 16) { /* not last block */
mluis 5:1e9f6a365854 89
mluis 1:352f608c3337 90 XOR(data, ctx->X);
mluis 1:352f608c3337 91 //rijndael_encrypt(&ctx->rijndael, ctx->X, ctx->X);
mluis 1:352f608c3337 92
mluis 1:352f608c3337 93 memcpy1(in, &ctx->X[0], 16); //Bestela ez du ondo iten
mluis 1:352f608c3337 94 aes_encrypt( in, in, &ctx->rijndael);
mluis 1:352f608c3337 95 memcpy1(&ctx->X[0], in, 16);
mluis 1:352f608c3337 96
mluis 1:352f608c3337 97 data += 16;
mluis 1:352f608c3337 98 len -= 16;
mluis 1:352f608c3337 99 }
mluis 1:352f608c3337 100 /* potential last block, save it */
mluis 1:352f608c3337 101 memcpy1(ctx->M_last, data, len);
mluis 1:352f608c3337 102 ctx->M_n = len;
mluis 1:352f608c3337 103 }
mluis 1:352f608c3337 104
mluis 1:352f608c3337 105 void AES_CMAC_Final(uint8_t digest[AES_CMAC_DIGEST_LENGTH], AES_CMAC_CTX *ctx)
mluis 1:352f608c3337 106 {
mluis 1:352f608c3337 107 uint8_t K[16];
mluis 1:352f608c3337 108 uint8_t in[16];
mluis 1:352f608c3337 109 /* generate subkey K1 */
mluis 1:352f608c3337 110 memset1(K, '\0', 16);
mluis 1:352f608c3337 111
mluis 1:352f608c3337 112 //rijndael_encrypt(&ctx->rijndael, K, K);
mluis 1:352f608c3337 113
mluis 1:352f608c3337 114 aes_encrypt( K, K, &ctx->rijndael);
mluis 1:352f608c3337 115
mluis 1:352f608c3337 116 if (K[0] & 0x80) {
mluis 1:352f608c3337 117 LSHIFT(K, K);
mluis 1:352f608c3337 118 K[15] ^= 0x87;
mluis 1:352f608c3337 119 } else
mluis 1:352f608c3337 120 LSHIFT(K, K);
mluis 1:352f608c3337 121
mluis 5:1e9f6a365854 122
mluis 1:352f608c3337 123 if (ctx->M_n == 16) {
mluis 1:352f608c3337 124 /* last block was a complete block */
mluis 1:352f608c3337 125 XOR(K, ctx->M_last);
mluis 1:352f608c3337 126
mluis 1:352f608c3337 127 } else {
mluis 1:352f608c3337 128 /* generate subkey K2 */
mluis 1:352f608c3337 129 if (K[0] & 0x80) {
mluis 1:352f608c3337 130 LSHIFT(K, K);
mluis 1:352f608c3337 131 K[15] ^= 0x87;
mluis 1:352f608c3337 132 } else
mluis 1:352f608c3337 133 LSHIFT(K, K);
mluis 1:352f608c3337 134
mluis 1:352f608c3337 135 /* padding(M_last) */
mluis 1:352f608c3337 136 ctx->M_last[ctx->M_n] = 0x80;
mluis 1:352f608c3337 137 while (++ctx->M_n < 16)
mluis 1:352f608c3337 138 ctx->M_last[ctx->M_n] = 0;
mluis 1:352f608c3337 139
mluis 1:352f608c3337 140 XOR(K, ctx->M_last);
mluis 5:1e9f6a365854 141
mluis 5:1e9f6a365854 142
mluis 1:352f608c3337 143 }
mluis 1:352f608c3337 144 XOR(ctx->M_last, ctx->X);
mluis 5:1e9f6a365854 145
mluis 1:352f608c3337 146 //rijndael_encrypt(&ctx->rijndael, ctx->X, digest);
mluis 5:1e9f6a365854 147
mluis 1:352f608c3337 148 memcpy1(in, &ctx->X[0], 16); //Bestela ez du ondo iten
mluis 1:352f608c3337 149 aes_encrypt(in, digest, &ctx->rijndael);
mluis 1:352f608c3337 150 memset1(K, 0, sizeof K);
mluis 1:352f608c3337 151
mluis 1:352f608c3337 152 }
mluis 1:352f608c3337 153