Uttam Bhat / LoRaWAN-NAMote72-Application-Demo-Test

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Dependencies:   LoRaWAN-lib SX1272Lib lib_gps lib_mma8451q lib_mpl3115a2 mbed

Fork of LoRaWAN-NAMote72-Application-Demo by Semtech

system/crypto/aes.h@0:69f2e28d12c1, 2016-05-17 (annotated)

Committer:
ubhat
Date:
Tue May 17 00:21:55 2016 +0000
Revision:
0:69f2e28d12c1
Project for LoRa Bootcamp

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ubhat 0:69f2e28d12c1 1 /*
ubhat 0:69f2e28d12c1 2 ---------------------------------------------------------------------------
ubhat 0:69f2e28d12c1 3 Copyright (c) 1998-2008, Brian Gladman, Worcester, UK. All rights reserved.
ubhat 0:69f2e28d12c1 4
ubhat 0:69f2e28d12c1 5 LICENSE TERMS
ubhat 0:69f2e28d12c1 6
ubhat 0:69f2e28d12c1 7 The redistribution and use of this software (with or without changes)
ubhat 0:69f2e28d12c1 8 is allowed without the payment of fees or royalties provided that:
ubhat 0:69f2e28d12c1 9
ubhat 0:69f2e28d12c1 10 1. source code distributions include the above copyright notice, this
ubhat 0:69f2e28d12c1 11 list of conditions and the following disclaimer;
ubhat 0:69f2e28d12c1 12
ubhat 0:69f2e28d12c1 13 2. binary distributions include the above copyright notice, this list
ubhat 0:69f2e28d12c1 14 of conditions and the following disclaimer in their documentation;
ubhat 0:69f2e28d12c1 15
ubhat 0:69f2e28d12c1 16 3. the name of the copyright holder is not used to endorse products
ubhat 0:69f2e28d12c1 17 built using this software without specific written permission.
ubhat 0:69f2e28d12c1 18
ubhat 0:69f2e28d12c1 19 DISCLAIMER
ubhat 0:69f2e28d12c1 20
ubhat 0:69f2e28d12c1 21 This software is provided 'as is' with no explicit or implied warranties
ubhat 0:69f2e28d12c1 22 in respect of its properties, including, but not limited to, correctness
ubhat 0:69f2e28d12c1 23 and/or fitness for purpose.
ubhat 0:69f2e28d12c1 24 ---------------------------------------------------------------------------
ubhat 0:69f2e28d12c1 25 Issue 09/09/2006
ubhat 0:69f2e28d12c1 26
ubhat 0:69f2e28d12c1 27 This is an AES implementation that uses only 8-bit byte operations on the
ubhat 0:69f2e28d12c1 28 cipher state.
ubhat 0:69f2e28d12c1 29 */
ubhat 0:69f2e28d12c1 30
ubhat 0:69f2e28d12c1 31 #ifndef AES_H
ubhat 0:69f2e28d12c1 32 #define AES_H
ubhat 0:69f2e28d12c1 33
ubhat 0:69f2e28d12c1 34 #if 1
ubhat 0:69f2e28d12c1 35 # define AES_ENC_PREKEYED /* AES encryption with a precomputed key schedule */
ubhat 0:69f2e28d12c1 36 #endif
ubhat 0:69f2e28d12c1 37 #if 0
ubhat 0:69f2e28d12c1 38 # define AES_DEC_PREKEYED /* AES decryption with a precomputed key schedule */
ubhat 0:69f2e28d12c1 39 #endif
ubhat 0:69f2e28d12c1 40 #if 0
ubhat 0:69f2e28d12c1 41 # define AES_ENC_128_OTFK /* AES encryption with 'on the fly' 128 bit keying */
ubhat 0:69f2e28d12c1 42 #endif
ubhat 0:69f2e28d12c1 43 #if 0
ubhat 0:69f2e28d12c1 44 # define AES_DEC_128_OTFK /* AES decryption with 'on the fly' 128 bit keying */
ubhat 0:69f2e28d12c1 45 #endif
ubhat 0:69f2e28d12c1 46 #if 0
ubhat 0:69f2e28d12c1 47 # define AES_ENC_256_OTFK /* AES encryption with 'on the fly' 256 bit keying */
ubhat 0:69f2e28d12c1 48 #endif
ubhat 0:69f2e28d12c1 49 #if 0
ubhat 0:69f2e28d12c1 50 # define AES_DEC_256_OTFK /* AES decryption with 'on the fly' 256 bit keying */
ubhat 0:69f2e28d12c1 51 #endif
ubhat 0:69f2e28d12c1 52
ubhat 0:69f2e28d12c1 53 #define N_ROW 4
ubhat 0:69f2e28d12c1 54 #define N_COL 4
ubhat 0:69f2e28d12c1 55 #define N_BLOCK (N_ROW * N_COL)
ubhat 0:69f2e28d12c1 56 #define N_MAX_ROUNDS 14
ubhat 0:69f2e28d12c1 57
ubhat 0:69f2e28d12c1 58 typedef uint8_t return_type;
ubhat 0:69f2e28d12c1 59
ubhat 0:69f2e28d12c1 60 /* Warning: The key length for 256 bit keys overflows a byte
ubhat 0:69f2e28d12c1 61 (see comment below)
ubhat 0:69f2e28d12c1 62 */
ubhat 0:69f2e28d12c1 63
ubhat 0:69f2e28d12c1 64 typedef uint8_t length_type;
ubhat 0:69f2e28d12c1 65
ubhat 0:69f2e28d12c1 66 typedef struct
ubhat 0:69f2e28d12c1 67 { uint8_t ksch[(N_MAX_ROUNDS + 1) * N_BLOCK];
ubhat 0:69f2e28d12c1 68 uint8_t rnd;
ubhat 0:69f2e28d12c1 69 } aes_context;
ubhat 0:69f2e28d12c1 70
ubhat 0:69f2e28d12c1 71 /* The following calls are for a precomputed key schedule
ubhat 0:69f2e28d12c1 72
ubhat 0:69f2e28d12c1 73 NOTE: If the length_type used for the key length is an
ubhat 0:69f2e28d12c1 74 unsigned 8-bit character, a key length of 256 bits must
ubhat 0:69f2e28d12c1 75 be entered as a length in bytes (valid inputs are hence
ubhat 0:69f2e28d12c1 76 128, 192, 16, 24 and 32).
ubhat 0:69f2e28d12c1 77 */
ubhat 0:69f2e28d12c1 78
ubhat 0:69f2e28d12c1 79 #if defined( AES_ENC_PREKEYED ) || defined( AES_DEC_PREKEYED )
ubhat 0:69f2e28d12c1 80
ubhat 0:69f2e28d12c1 81 return_type aes_set_key( const uint8_t key[],
ubhat 0:69f2e28d12c1 82 length_type keylen,
ubhat 0:69f2e28d12c1 83 aes_context ctx[1] );
ubhat 0:69f2e28d12c1 84 #endif
ubhat 0:69f2e28d12c1 85
ubhat 0:69f2e28d12c1 86 #if defined( AES_ENC_PREKEYED )
ubhat 0:69f2e28d12c1 87
ubhat 0:69f2e28d12c1 88 return_type aes_encrypt( const uint8_t in[N_BLOCK],
ubhat 0:69f2e28d12c1 89 uint8_t out[N_BLOCK],
ubhat 0:69f2e28d12c1 90 const aes_context ctx[1] );
ubhat 0:69f2e28d12c1 91
ubhat 0:69f2e28d12c1 92 return_type aes_cbc_encrypt( const uint8_t *in,
ubhat 0:69f2e28d12c1 93 uint8_t *out,
ubhat 0:69f2e28d12c1 94 int32_t n_block,
ubhat 0:69f2e28d12c1 95 uint8_t iv[N_BLOCK],
ubhat 0:69f2e28d12c1 96 const aes_context ctx[1] );
ubhat 0:69f2e28d12c1 97 #endif
ubhat 0:69f2e28d12c1 98
ubhat 0:69f2e28d12c1 99 #if defined( AES_DEC_PREKEYED )
ubhat 0:69f2e28d12c1 100
ubhat 0:69f2e28d12c1 101 return_type aes_decrypt( const uint8_t in[N_BLOCK],
ubhat 0:69f2e28d12c1 102 uint8_t out[N_BLOCK],
ubhat 0:69f2e28d12c1 103 const aes_context ctx[1] );
ubhat 0:69f2e28d12c1 104
ubhat 0:69f2e28d12c1 105 return_type aes_cbc_decrypt( const uint8_t *in,
ubhat 0:69f2e28d12c1 106 uint8_t *out,
ubhat 0:69f2e28d12c1 107 int32_t n_block,
ubhat 0:69f2e28d12c1 108 uint8_t iv[N_BLOCK],
ubhat 0:69f2e28d12c1 109 const aes_context ctx[1] );
ubhat 0:69f2e28d12c1 110 #endif
ubhat 0:69f2e28d12c1 111
ubhat 0:69f2e28d12c1 112 /* The following calls are for 'on the fly' keying. In this case the
ubhat 0:69f2e28d12c1 113 encryption and decryption keys are different.
ubhat 0:69f2e28d12c1 114
ubhat 0:69f2e28d12c1 115 The encryption subroutines take a key in an array of bytes in
ubhat 0:69f2e28d12c1 116 key[L] where L is 16, 24 or 32 bytes for key lengths of 128,
ubhat 0:69f2e28d12c1 117 192, and 256 bits respectively. They then encrypts the input
ubhat 0:69f2e28d12c1 118 data, in[] with this key and put the reult in the output array
ubhat 0:69f2e28d12c1 119 out[]. In addition, the second key array, o_key[L], is used
ubhat 0:69f2e28d12c1 120 to output the key that is needed by the decryption subroutine
ubhat 0:69f2e28d12c1 121 to reverse the encryption operation. The two key arrays can
ubhat 0:69f2e28d12c1 122 be the same array but in this case the original key will be
ubhat 0:69f2e28d12c1 123 overwritten.
ubhat 0:69f2e28d12c1 124
ubhat 0:69f2e28d12c1 125 In the same way, the decryption subroutines output keys that
ubhat 0:69f2e28d12c1 126 can be used to reverse their effect when used for encryption.
ubhat 0:69f2e28d12c1 127
ubhat 0:69f2e28d12c1 128 Only 128 and 256 bit keys are supported in these 'on the fly'
ubhat 0:69f2e28d12c1 129 modes.
ubhat 0:69f2e28d12c1 130 */
ubhat 0:69f2e28d12c1 131
ubhat 0:69f2e28d12c1 132 #if defined( AES_ENC_128_OTFK )
ubhat 0:69f2e28d12c1 133 void aes_encrypt_128( const uint8_t in[N_BLOCK],
ubhat 0:69f2e28d12c1 134 uint8_t out[N_BLOCK],
ubhat 0:69f2e28d12c1 135 const uint8_t key[N_BLOCK],
ubhat 0:69f2e28d12c1 136 uint8_t o_key[N_BLOCK] );
ubhat 0:69f2e28d12c1 137 #endif
ubhat 0:69f2e28d12c1 138
ubhat 0:69f2e28d12c1 139 #if defined( AES_DEC_128_OTFK )
ubhat 0:69f2e28d12c1 140 void aes_decrypt_128( const uint8_t in[N_BLOCK],
ubhat 0:69f2e28d12c1 141 uint8_t out[N_BLOCK],
ubhat 0:69f2e28d12c1 142 const uint8_t key[N_BLOCK],
ubhat 0:69f2e28d12c1 143 uint8_t o_key[N_BLOCK] );
ubhat 0:69f2e28d12c1 144 #endif
ubhat 0:69f2e28d12c1 145
ubhat 0:69f2e28d12c1 146 #if defined( AES_ENC_256_OTFK )
ubhat 0:69f2e28d12c1 147 void aes_encrypt_256( const uint8_t in[N_BLOCK],
ubhat 0:69f2e28d12c1 148 uint8_t out[N_BLOCK],
ubhat 0:69f2e28d12c1 149 const uint8_t key[2 * N_BLOCK],
ubhat 0:69f2e28d12c1 150 uint8_t o_key[2 * N_BLOCK] );
ubhat 0:69f2e28d12c1 151 #endif
ubhat 0:69f2e28d12c1 152
ubhat 0:69f2e28d12c1 153 #if defined( AES_DEC_256_OTFK )
ubhat 0:69f2e28d12c1 154 void aes_decrypt_256( const uint8_t in[N_BLOCK],
ubhat 0:69f2e28d12c1 155 uint8_t out[N_BLOCK],
ubhat 0:69f2e28d12c1 156 const uint8_t key[2 * N_BLOCK],
ubhat 0:69f2e28d12c1 157 uint8_t o_key[2 * N_BLOCK] );
ubhat 0:69f2e28d12c1 158 #endif
ubhat 0:69f2e28d12c1 159
ubhat 0:69f2e28d12c1 160 #endif