Josh Curry / Mbed 2 deprecated simple-demo-72

Simple LoRaWAN Demo (SX1272 Radio)

Dependencies:   mbed LoRaWAN-lib SX1272Lib

Fork of LoRaWAN-demo-72 by Semtech

system/crypto/aes.h@8:421371b1777a, 2017-10-19 (annotated)

Committer:
joshcurry
Date:
Thu Oct 19 13:26:21 2017 +0000
Revision:
8:421371b1777a
Parent:
0:45496a70a8a5 
Working as of 19th october.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mluis 0:45496a70a8a5 1 /*
mluis 0:45496a70a8a5 2 ---------------------------------------------------------------------------
mluis 0:45496a70a8a5 3 Copyright (c) 1998-2008, Brian Gladman, Worcester, UK. All rights reserved.
mluis 0:45496a70a8a5 4
mluis 0:45496a70a8a5 5 LICENSE TERMS
mluis 0:45496a70a8a5 6
mluis 0:45496a70a8a5 7 The redistribution and use of this software (with or without changes)
mluis 0:45496a70a8a5 8 is allowed without the payment of fees or royalties provided that:
mluis 0:45496a70a8a5 9
mluis 0:45496a70a8a5 10 1. source code distributions include the above copyright notice, this
mluis 0:45496a70a8a5 11 list of conditions and the following disclaimer;
mluis 0:45496a70a8a5 12
mluis 0:45496a70a8a5 13 2. binary distributions include the above copyright notice, this list
mluis 0:45496a70a8a5 14 of conditions and the following disclaimer in their documentation;
mluis 0:45496a70a8a5 15
mluis 0:45496a70a8a5 16 3. the name of the copyright holder is not used to endorse products
mluis 0:45496a70a8a5 17 built using this software without specific written permission.
mluis 0:45496a70a8a5 18
mluis 0:45496a70a8a5 19 DISCLAIMER
mluis 0:45496a70a8a5 20
mluis 0:45496a70a8a5 21 This software is provided 'as is' with no explicit or implied warranties
mluis 0:45496a70a8a5 22 in respect of its properties, including, but not limited to, correctness
mluis 0:45496a70a8a5 23 and/or fitness for purpose.
mluis 0:45496a70a8a5 24 ---------------------------------------------------------------------------
mluis 0:45496a70a8a5 25 Issue 09/09/2006
mluis 0:45496a70a8a5 26
mluis 0:45496a70a8a5 27 This is an AES implementation that uses only 8-bit byte operations on the
mluis 0:45496a70a8a5 28 cipher state.
mluis 0:45496a70a8a5 29 */
mluis 0:45496a70a8a5 30
mluis 0:45496a70a8a5 31 #ifndef AES_H
mluis 0:45496a70a8a5 32 #define AES_H
mluis 0:45496a70a8a5 33
mluis 0:45496a70a8a5 34 #if 1
mluis 0:45496a70a8a5 35 # define AES_ENC_PREKEYED /* AES encryption with a precomputed key schedule */
mluis 0:45496a70a8a5 36 #endif
mluis 0:45496a70a8a5 37 #if 0
mluis 0:45496a70a8a5 38 # define AES_DEC_PREKEYED /* AES decryption with a precomputed key schedule */
mluis 0:45496a70a8a5 39 #endif
mluis 0:45496a70a8a5 40 #if 0
mluis 0:45496a70a8a5 41 # define AES_ENC_128_OTFK /* AES encryption with 'on the fly' 128 bit keying */
mluis 0:45496a70a8a5 42 #endif
mluis 0:45496a70a8a5 43 #if 0
mluis 0:45496a70a8a5 44 # define AES_DEC_128_OTFK /* AES decryption with 'on the fly' 128 bit keying */
mluis 0:45496a70a8a5 45 #endif
mluis 0:45496a70a8a5 46 #if 0
mluis 0:45496a70a8a5 47 # define AES_ENC_256_OTFK /* AES encryption with 'on the fly' 256 bit keying */
mluis 0:45496a70a8a5 48 #endif
mluis 0:45496a70a8a5 49 #if 0
mluis 0:45496a70a8a5 50 # define AES_DEC_256_OTFK /* AES decryption with 'on the fly' 256 bit keying */
mluis 0:45496a70a8a5 51 #endif
mluis 0:45496a70a8a5 52
mluis 0:45496a70a8a5 53 #define N_ROW 4
mluis 0:45496a70a8a5 54 #define N_COL 4
mluis 0:45496a70a8a5 55 #define N_BLOCK (N_ROW * N_COL)
mluis 0:45496a70a8a5 56 #define N_MAX_ROUNDS 14
mluis 0:45496a70a8a5 57
mluis 0:45496a70a8a5 58 typedef uint8_t return_type;
mluis 0:45496a70a8a5 59
mluis 0:45496a70a8a5 60 /* Warning: The key length for 256 bit keys overflows a byte
mluis 0:45496a70a8a5 61 (see comment below)
mluis 0:45496a70a8a5 62 */
mluis 0:45496a70a8a5 63
mluis 0:45496a70a8a5 64 typedef uint8_t length_type;
mluis 0:45496a70a8a5 65
mluis 0:45496a70a8a5 66 typedef struct
mluis 0:45496a70a8a5 67 { uint8_t ksch[(N_MAX_ROUNDS + 1) * N_BLOCK];
mluis 0:45496a70a8a5 68 uint8_t rnd;
mluis 0:45496a70a8a5 69 } aes_context;
mluis 0:45496a70a8a5 70
mluis 0:45496a70a8a5 71 /* The following calls are for a precomputed key schedule
mluis 0:45496a70a8a5 72
mluis 0:45496a70a8a5 73 NOTE: If the length_type used for the key length is an
mluis 0:45496a70a8a5 74 unsigned 8-bit character, a key length of 256 bits must
mluis 0:45496a70a8a5 75 be entered as a length in bytes (valid inputs are hence
mluis 0:45496a70a8a5 76 128, 192, 16, 24 and 32).
mluis 0:45496a70a8a5 77 */
mluis 0:45496a70a8a5 78
mluis 0:45496a70a8a5 79 #if defined( AES_ENC_PREKEYED ) || defined( AES_DEC_PREKEYED )
mluis 0:45496a70a8a5 80
mluis 0:45496a70a8a5 81 return_type aes_set_key( const uint8_t key[],
mluis 0:45496a70a8a5 82 length_type keylen,
mluis 0:45496a70a8a5 83 aes_context ctx[1] );
mluis 0:45496a70a8a5 84 #endif
mluis 0:45496a70a8a5 85
mluis 0:45496a70a8a5 86 #if defined( AES_ENC_PREKEYED )
mluis 0:45496a70a8a5 87
mluis 0:45496a70a8a5 88 return_type aes_encrypt( const uint8_t in[N_BLOCK],
mluis 0:45496a70a8a5 89 uint8_t out[N_BLOCK],
mluis 0:45496a70a8a5 90 const aes_context ctx[1] );
mluis 0:45496a70a8a5 91
mluis 0:45496a70a8a5 92 return_type aes_cbc_encrypt( const uint8_t *in,
mluis 0:45496a70a8a5 93 uint8_t *out,
mluis 0:45496a70a8a5 94 int32_t n_block,
mluis 0:45496a70a8a5 95 uint8_t iv[N_BLOCK],
mluis 0:45496a70a8a5 96 const aes_context ctx[1] );
mluis 0:45496a70a8a5 97 #endif
mluis 0:45496a70a8a5 98
mluis 0:45496a70a8a5 99 #if defined( AES_DEC_PREKEYED )
mluis 0:45496a70a8a5 100
mluis 0:45496a70a8a5 101 return_type aes_decrypt( const uint8_t in[N_BLOCK],
mluis 0:45496a70a8a5 102 uint8_t out[N_BLOCK],
mluis 0:45496a70a8a5 103 const aes_context ctx[1] );
mluis 0:45496a70a8a5 104
mluis 0:45496a70a8a5 105 return_type aes_cbc_decrypt( const uint8_t *in,
mluis 0:45496a70a8a5 106 uint8_t *out,
mluis 0:45496a70a8a5 107 int32_t n_block,
mluis 0:45496a70a8a5 108 uint8_t iv[N_BLOCK],
mluis 0:45496a70a8a5 109 const aes_context ctx[1] );
mluis 0:45496a70a8a5 110 #endif
mluis 0:45496a70a8a5 111
mluis 0:45496a70a8a5 112 /* The following calls are for 'on the fly' keying. In this case the
mluis 0:45496a70a8a5 113 encryption and decryption keys are different.
mluis 0:45496a70a8a5 114
mluis 0:45496a70a8a5 115 The encryption subroutines take a key in an array of bytes in
mluis 0:45496a70a8a5 116 key[L] where L is 16, 24 or 32 bytes for key lengths of 128,
mluis 0:45496a70a8a5 117 192, and 256 bits respectively. They then encrypts the input
mluis 0:45496a70a8a5 118 data, in[] with this key and put the reult in the output array
mluis 0:45496a70a8a5 119 out[]. In addition, the second key array, o_key[L], is used
mluis 0:45496a70a8a5 120 to output the key that is needed by the decryption subroutine
mluis 0:45496a70a8a5 121 to reverse the encryption operation. The two key arrays can
mluis 0:45496a70a8a5 122 be the same array but in this case the original key will be
mluis 0:45496a70a8a5 123 overwritten.
mluis 0:45496a70a8a5 124
mluis 0:45496a70a8a5 125 In the same way, the decryption subroutines output keys that
mluis 0:45496a70a8a5 126 can be used to reverse their effect when used for encryption.
mluis 0:45496a70a8a5 127
mluis 0:45496a70a8a5 128 Only 128 and 256 bit keys are supported in these 'on the fly'
mluis 0:45496a70a8a5 129 modes.
mluis 0:45496a70a8a5 130 */
mluis 0:45496a70a8a5 131
mluis 0:45496a70a8a5 132 #if defined( AES_ENC_128_OTFK )
mluis 0:45496a70a8a5 133 void aes_encrypt_128( const uint8_t in[N_BLOCK],
mluis 0:45496a70a8a5 134 uint8_t out[N_BLOCK],
mluis 0:45496a70a8a5 135 const uint8_t key[N_BLOCK],
mluis 0:45496a70a8a5 136 uint8_t o_key[N_BLOCK] );
mluis 0:45496a70a8a5 137 #endif
mluis 0:45496a70a8a5 138
mluis 0:45496a70a8a5 139 #if defined( AES_DEC_128_OTFK )
mluis 0:45496a70a8a5 140 void aes_decrypt_128( const uint8_t in[N_BLOCK],
mluis 0:45496a70a8a5 141 uint8_t out[N_BLOCK],
mluis 0:45496a70a8a5 142 const uint8_t key[N_BLOCK],
mluis 0:45496a70a8a5 143 uint8_t o_key[N_BLOCK] );
mluis 0:45496a70a8a5 144 #endif
mluis 0:45496a70a8a5 145
mluis 0:45496a70a8a5 146 #if defined( AES_ENC_256_OTFK )
mluis 0:45496a70a8a5 147 void aes_encrypt_256( const uint8_t in[N_BLOCK],
mluis 0:45496a70a8a5 148 uint8_t out[N_BLOCK],
mluis 0:45496a70a8a5 149 const uint8_t key[2 * N_BLOCK],
mluis 0:45496a70a8a5 150 uint8_t o_key[2 * N_BLOCK] );
mluis 0:45496a70a8a5 151 #endif
mluis 0:45496a70a8a5 152
mluis 0:45496a70a8a5 153 #if defined( AES_DEC_256_OTFK )
mluis 0:45496a70a8a5 154 void aes_decrypt_256( const uint8_t in[N_BLOCK],
mluis 0:45496a70a8a5 155 uint8_t out[N_BLOCK],
mluis 0:45496a70a8a5 156 const uint8_t key[2 * N_BLOCK],
mluis 0:45496a70a8a5 157 uint8_t o_key[2 * N_BLOCK] );
mluis 0:45496a70a8a5 158 #endif
mluis 0:45496a70a8a5 159
mluis 0:45496a70a8a5 160 #endif