Campbell Scientific Australia / Mbed 2 deprecated mDot_Semtech_LoRaWAN_Stack

This code uses Semtech's open source LoRaWAN stack ported to mbed environment.

Dependencies:   mbed LoRaWAN-lib SX1272Lib

system/crypto/aes.h@1:7da3f0db0d82, 2016-06-10 (annotated)

Committer:
Mehrad
Date:
Fri Jun 10 00:01:00 2016 +0000
Revision:
1:7da3f0db0d82
Parent:
0:6155544d38b1 
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Mehrad 0:6155544d38b1 1 /*
Mehrad 0:6155544d38b1 2 ---------------------------------------------------------------------------
Mehrad 0:6155544d38b1 3 Copyright (c) 1998-2008, Brian Gladman, Worcester, UK. All rights reserved.
Mehrad 0:6155544d38b1 4
Mehrad 0:6155544d38b1 5 LICENSE TERMS
Mehrad 0:6155544d38b1 6
Mehrad 0:6155544d38b1 7 The redistribution and use of this software (with or without changes)
Mehrad 0:6155544d38b1 8 is allowed without the payment of fees or royalties provided that:
Mehrad 0:6155544d38b1 9
Mehrad 0:6155544d38b1 10 1. source code distributions include the above copyright notice, this
Mehrad 0:6155544d38b1 11 list of conditions and the following disclaimer;
Mehrad 0:6155544d38b1 12
Mehrad 0:6155544d38b1 13 2. binary distributions include the above copyright notice, this list
Mehrad 0:6155544d38b1 14 of conditions and the following disclaimer in their documentation;
Mehrad 0:6155544d38b1 15
Mehrad 0:6155544d38b1 16 3. the name of the copyright holder is not used to endorse products
Mehrad 0:6155544d38b1 17 built using this software without specific written permission.
Mehrad 0:6155544d38b1 18
Mehrad 0:6155544d38b1 19 DISCLAIMER
Mehrad 0:6155544d38b1 20
Mehrad 0:6155544d38b1 21 This software is provided 'as is' with no explicit or implied warranties
Mehrad 0:6155544d38b1 22 in respect of its properties, including, but not limited to, correctness
Mehrad 0:6155544d38b1 23 and/or fitness for purpose.
Mehrad 0:6155544d38b1 24 ---------------------------------------------------------------------------
Mehrad 0:6155544d38b1 25 Issue 09/09/2006
Mehrad 0:6155544d38b1 26
Mehrad 0:6155544d38b1 27 This is an AES implementation that uses only 8-bit byte operations on the
Mehrad 0:6155544d38b1 28 cipher state.
Mehrad 0:6155544d38b1 29 */
Mehrad 0:6155544d38b1 30
Mehrad 0:6155544d38b1 31 #ifndef AES_H
Mehrad 0:6155544d38b1 32 #define AES_H
Mehrad 0:6155544d38b1 33
Mehrad 0:6155544d38b1 34 #if 1
Mehrad 0:6155544d38b1 35 # define AES_ENC_PREKEYED /* AES encryption with a precomputed key schedule */
Mehrad 0:6155544d38b1 36 #endif
Mehrad 0:6155544d38b1 37 #if 0
Mehrad 0:6155544d38b1 38 # define AES_DEC_PREKEYED /* AES decryption with a precomputed key schedule */
Mehrad 0:6155544d38b1 39 #endif
Mehrad 0:6155544d38b1 40 #if 0
Mehrad 0:6155544d38b1 41 # define AES_ENC_128_OTFK /* AES encryption with 'on the fly' 128 bit keying */
Mehrad 0:6155544d38b1 42 #endif
Mehrad 0:6155544d38b1 43 #if 0
Mehrad 0:6155544d38b1 44 # define AES_DEC_128_OTFK /* AES decryption with 'on the fly' 128 bit keying */
Mehrad 0:6155544d38b1 45 #endif
Mehrad 0:6155544d38b1 46 #if 0
Mehrad 0:6155544d38b1 47 # define AES_ENC_256_OTFK /* AES encryption with 'on the fly' 256 bit keying */
Mehrad 0:6155544d38b1 48 #endif
Mehrad 0:6155544d38b1 49 #if 0
Mehrad 0:6155544d38b1 50 # define AES_DEC_256_OTFK /* AES decryption with 'on the fly' 256 bit keying */
Mehrad 0:6155544d38b1 51 #endif
Mehrad 0:6155544d38b1 52
Mehrad 0:6155544d38b1 53 #define N_ROW 4
Mehrad 0:6155544d38b1 54 #define N_COL 4
Mehrad 0:6155544d38b1 55 #define N_BLOCK (N_ROW * N_COL)
Mehrad 0:6155544d38b1 56 #define N_MAX_ROUNDS 14
Mehrad 0:6155544d38b1 57
Mehrad 0:6155544d38b1 58 typedef uint8_t return_type;
Mehrad 0:6155544d38b1 59
Mehrad 0:6155544d38b1 60 /* Warning: The key length for 256 bit keys overflows a byte
Mehrad 0:6155544d38b1 61 (see comment below)
Mehrad 0:6155544d38b1 62 */
Mehrad 0:6155544d38b1 63
Mehrad 0:6155544d38b1 64 typedef uint8_t length_type;
Mehrad 0:6155544d38b1 65
Mehrad 0:6155544d38b1 66 typedef struct
Mehrad 0:6155544d38b1 67 { uint8_t ksch[(N_MAX_ROUNDS + 1) * N_BLOCK];
Mehrad 0:6155544d38b1 68 uint8_t rnd;
Mehrad 0:6155544d38b1 69 } aes_context;
Mehrad 0:6155544d38b1 70
Mehrad 0:6155544d38b1 71 /* The following calls are for a precomputed key schedule
Mehrad 0:6155544d38b1 72
Mehrad 0:6155544d38b1 73 NOTE: If the length_type used for the key length is an
Mehrad 0:6155544d38b1 74 unsigned 8-bit character, a key length of 256 bits must
Mehrad 0:6155544d38b1 75 be entered as a length in bytes (valid inputs are hence
Mehrad 0:6155544d38b1 76 128, 192, 16, 24 and 32).
Mehrad 0:6155544d38b1 77 */
Mehrad 0:6155544d38b1 78
Mehrad 0:6155544d38b1 79 #if defined( AES_ENC_PREKEYED ) || defined( AES_DEC_PREKEYED )
Mehrad 0:6155544d38b1 80
Mehrad 0:6155544d38b1 81 return_type aes_set_key( const uint8_t key[],
Mehrad 0:6155544d38b1 82 length_type keylen,
Mehrad 0:6155544d38b1 83 aes_context ctx[1] );
Mehrad 0:6155544d38b1 84 #endif
Mehrad 0:6155544d38b1 85
Mehrad 0:6155544d38b1 86 #if defined( AES_ENC_PREKEYED )
Mehrad 0:6155544d38b1 87
Mehrad 0:6155544d38b1 88 return_type aes_encrypt( const uint8_t in[N_BLOCK],
Mehrad 0:6155544d38b1 89 uint8_t out[N_BLOCK],
Mehrad 0:6155544d38b1 90 const aes_context ctx[1] );
Mehrad 0:6155544d38b1 91
Mehrad 0:6155544d38b1 92 return_type aes_cbc_encrypt( const uint8_t *in,
Mehrad 0:6155544d38b1 93 uint8_t *out,
Mehrad 0:6155544d38b1 94 int32_t n_block,
Mehrad 0:6155544d38b1 95 uint8_t iv[N_BLOCK],
Mehrad 0:6155544d38b1 96 const aes_context ctx[1] );
Mehrad 0:6155544d38b1 97 #endif
Mehrad 0:6155544d38b1 98
Mehrad 0:6155544d38b1 99 #if defined( AES_DEC_PREKEYED )
Mehrad 0:6155544d38b1 100
Mehrad 0:6155544d38b1 101 return_type aes_decrypt( const uint8_t in[N_BLOCK],
Mehrad 0:6155544d38b1 102 uint8_t out[N_BLOCK],
Mehrad 0:6155544d38b1 103 const aes_context ctx[1] );
Mehrad 0:6155544d38b1 104
Mehrad 0:6155544d38b1 105 return_type aes_cbc_decrypt( const uint8_t *in,
Mehrad 0:6155544d38b1 106 uint8_t *out,
Mehrad 0:6155544d38b1 107 int32_t n_block,
Mehrad 0:6155544d38b1 108 uint8_t iv[N_BLOCK],
Mehrad 0:6155544d38b1 109 const aes_context ctx[1] );
Mehrad 0:6155544d38b1 110 #endif
Mehrad 0:6155544d38b1 111
Mehrad 0:6155544d38b1 112 /* The following calls are for 'on the fly' keying. In this case the
Mehrad 0:6155544d38b1 113 encryption and decryption keys are different.
Mehrad 0:6155544d38b1 114
Mehrad 0:6155544d38b1 115 The encryption subroutines take a key in an array of bytes in
Mehrad 0:6155544d38b1 116 key[L] where L is 16, 24 or 32 bytes for key lengths of 128,
Mehrad 0:6155544d38b1 117 192, and 256 bits respectively. They then encrypts the input
Mehrad 0:6155544d38b1 118 data, in[] with this key and put the reult in the output array
Mehrad 0:6155544d38b1 119 out[]. In addition, the second key array, o_key[L], is used
Mehrad 0:6155544d38b1 120 to output the key that is needed by the decryption subroutine
Mehrad 0:6155544d38b1 121 to reverse the encryption operation. The two key arrays can
Mehrad 0:6155544d38b1 122 be the same array but in this case the original key will be
Mehrad 0:6155544d38b1 123 overwritten.
Mehrad 0:6155544d38b1 124
Mehrad 0:6155544d38b1 125 In the same way, the decryption subroutines output keys that
Mehrad 0:6155544d38b1 126 can be used to reverse their effect when used for encryption.
Mehrad 0:6155544d38b1 127
Mehrad 0:6155544d38b1 128 Only 128 and 256 bit keys are supported in these 'on the fly'
Mehrad 0:6155544d38b1 129 modes.
Mehrad 0:6155544d38b1 130 */
Mehrad 0:6155544d38b1 131
Mehrad 0:6155544d38b1 132 #if defined( AES_ENC_128_OTFK )
Mehrad 0:6155544d38b1 133 void aes_encrypt_128( const uint8_t in[N_BLOCK],
Mehrad 0:6155544d38b1 134 uint8_t out[N_BLOCK],
Mehrad 0:6155544d38b1 135 const uint8_t key[N_BLOCK],
Mehrad 0:6155544d38b1 136 uint8_t o_key[N_BLOCK] );
Mehrad 0:6155544d38b1 137 #endif
Mehrad 0:6155544d38b1 138
Mehrad 0:6155544d38b1 139 #if defined( AES_DEC_128_OTFK )
Mehrad 0:6155544d38b1 140 void aes_decrypt_128( const uint8_t in[N_BLOCK],
Mehrad 0:6155544d38b1 141 uint8_t out[N_BLOCK],
Mehrad 0:6155544d38b1 142 const uint8_t key[N_BLOCK],
Mehrad 0:6155544d38b1 143 uint8_t o_key[N_BLOCK] );
Mehrad 0:6155544d38b1 144 #endif
Mehrad 0:6155544d38b1 145
Mehrad 0:6155544d38b1 146 #if defined( AES_ENC_256_OTFK )
Mehrad 0:6155544d38b1 147 void aes_encrypt_256( const uint8_t in[N_BLOCK],
Mehrad 0:6155544d38b1 148 uint8_t out[N_BLOCK],
Mehrad 0:6155544d38b1 149 const uint8_t key[2 * N_BLOCK],
Mehrad 0:6155544d38b1 150 uint8_t o_key[2 * N_BLOCK] );
Mehrad 0:6155544d38b1 151 #endif
Mehrad 0:6155544d38b1 152
Mehrad 0:6155544d38b1 153 #if defined( AES_DEC_256_OTFK )
Mehrad 0:6155544d38b1 154 void aes_decrypt_256( const uint8_t in[N_BLOCK],
Mehrad 0:6155544d38b1 155 uint8_t out[N_BLOCK],
Mehrad 0:6155544d38b1 156 const uint8_t key[2 * N_BLOCK],
Mehrad 0:6155544d38b1 157 uint8_t o_key[2 * N_BLOCK] );
Mehrad 0:6155544d38b1 158 #endif
Mehrad 0:6155544d38b1 159
Mehrad 0:6155544d38b1 160 #endif