162 lines
5.5 KiB
C
162 lines
5.5 KiB
C
/*
|
|
---------------------------------------------------------------------------
|
|
Copyright (c) 1998-2008, Brian Gladman, Worcester, UK. All rights reserved.
|
|
|
|
LICENSE TERMS
|
|
|
|
The redistribution and use of this software (with or without changes)
|
|
is allowed without the payment of fees or royalties provided that:
|
|
|
|
1. source code distributions include the above copyright notice, this
|
|
list of conditions and the following disclaimer;
|
|
|
|
2. binary distributions include the above copyright notice, this list
|
|
of conditions and the following disclaimer in their documentation;
|
|
|
|
3. the name of the copyright holder is not used to endorse products
|
|
built using this software without specific written permission.
|
|
|
|
DISCLAIMER
|
|
|
|
This software is provided 'as is' with no explicit or implied warranties
|
|
in respect of its properties, including, but not limited to, correctness
|
|
and/or fitness for purpose.
|
|
---------------------------------------------------------------------------
|
|
Issue 09/09/2006
|
|
|
|
This is an AES implementation that uses only 8-bit byte operations on the
|
|
cipher state.
|
|
*/
|
|
|
|
#ifndef AES_H
|
|
#define AES_H
|
|
|
|
#if 1
|
|
# define AES_ENC_PREKEYED /* AES encryption with a precomputed key schedule */
|
|
#endif
|
|
#if 1
|
|
# define AES_DEC_PREKEYED /* AES decryption with a precomputed key schedule */
|
|
#endif
|
|
#if 1
|
|
# define AES_ENC_128_OTFK /* AES encryption with 'on the fly' 128 bit keying */
|
|
#endif
|
|
#if 1
|
|
# define AES_DEC_128_OTFK /* AES decryption with 'on the fly' 128 bit keying */
|
|
#endif
|
|
#if 1
|
|
# define AES_ENC_256_OTFK /* AES encryption with 'on the fly' 256 bit keying */
|
|
#endif
|
|
#if 1
|
|
# define AES_DEC_256_OTFK /* AES decryption with 'on the fly' 256 bit keying */
|
|
#endif
|
|
|
|
#define N_ROW 4
|
|
#define N_COL 4
|
|
#define N_BLOCK (N_ROW * N_COL)
|
|
#define N_MAX_ROUNDS 14
|
|
|
|
typedef unsigned char uint_8t;
|
|
|
|
typedef uint_8t return_type;
|
|
|
|
/* Warning: The key length for 256 bit keys overflows a byte
|
|
(see comment below)
|
|
*/
|
|
|
|
typedef uint_8t length_type;
|
|
|
|
typedef struct {
|
|
uint_8t ksch[(N_MAX_ROUNDS + 1) * N_BLOCK];
|
|
uint_8t rnd;
|
|
} aes_context;
|
|
|
|
/* The following calls are for a precomputed key schedule
|
|
|
|
NOTE: If the length_type used for the key length is an
|
|
unsigned 8-bit character, a key length of 256 bits must
|
|
be entered as a length in bytes (valid inputs are hence
|
|
128, 192, 16, 24 and 32).
|
|
*/
|
|
|
|
#if defined( AES_ENC_PREKEYED ) || defined( AES_DEC_PREKEYED )
|
|
|
|
return_type aes_set_key( const unsigned char key[],
|
|
length_type keylen,
|
|
aes_context ctx[1] );
|
|
#endif
|
|
|
|
#if defined( AES_ENC_PREKEYED )
|
|
|
|
return_type bluedroid_aes_encrypt( const unsigned char in[N_BLOCK],
|
|
unsigned char out[N_BLOCK],
|
|
const aes_context ctx[1] );
|
|
|
|
return_type aes_cbc_encrypt( const unsigned char *in,
|
|
unsigned char *out,
|
|
int n_block,
|
|
unsigned char iv[N_BLOCK],
|
|
const aes_context ctx[1] );
|
|
#endif
|
|
|
|
#if defined( AES_DEC_PREKEYED )
|
|
|
|
return_type bluedroid_aes_decrypt( const unsigned char in[N_BLOCK],
|
|
unsigned char out[N_BLOCK],
|
|
const aes_context ctx[1] );
|
|
|
|
return_type aes_cbc_decrypt( const unsigned char *in,
|
|
unsigned char *out,
|
|
int n_block,
|
|
unsigned char iv[N_BLOCK],
|
|
const aes_context ctx[1] );
|
|
#endif
|
|
|
|
/* The following calls are for 'on the fly' keying. In this case the
|
|
encryption and decryption keys are different.
|
|
|
|
The encryption subroutines take a key in an array of bytes in
|
|
key[L] where L is 16, 24 or 32 bytes for key lengths of 128,
|
|
192, and 256 bits respectively. They then encrypts the input
|
|
data, in[] with this key and put the reult in the output array
|
|
out[]. In addition, the second key array, o_key[L], is used
|
|
to output the key that is needed by the decryption subroutine
|
|
to reverse the encryption operation. The two key arrays can
|
|
be the same array but in this case the original key will be
|
|
overwritten.
|
|
|
|
In the same way, the decryption subroutines output keys that
|
|
can be used to reverse their effect when used for encryption.
|
|
|
|
Only 128 and 256 bit keys are supported in these 'on the fly'
|
|
modes.
|
|
*/
|
|
|
|
#if defined( AES_ENC_128_OTFK )
|
|
void bluedroid_aes_encrypt_128( const unsigned char in[N_BLOCK],
|
|
unsigned char out[N_BLOCK],
|
|
const unsigned char key[N_BLOCK],
|
|
uint_8t o_key[N_BLOCK] );
|
|
#endif
|
|
|
|
#if defined( AES_DEC_128_OTFK )
|
|
void bluedroid_aes_decrypt_128( const unsigned char in[N_BLOCK],
|
|
unsigned char out[N_BLOCK],
|
|
const unsigned char key[N_BLOCK],
|
|
unsigned char o_key[N_BLOCK] );
|
|
#endif
|
|
|
|
#if defined( AES_ENC_256_OTFK )
|
|
void bluedroid_aes_encrypt_256( const unsigned char in[N_BLOCK],
|
|
unsigned char out[N_BLOCK],
|
|
const unsigned char key[2 * N_BLOCK],
|
|
unsigned char o_key[2 * N_BLOCK] );
|
|
#endif
|
|
|
|
#if defined( AES_DEC_256_OTFK )
|
|
void bluedroid_aes_decrypt_256( const unsigned char in[N_BLOCK],
|
|
unsigned char out[N_BLOCK],
|
|
const unsigned char key[2 * N_BLOCK],
|
|
unsigned char o_key[2 * N_BLOCK] );
|
|
#endif
|
|
|
|
#endif
|