65816-crypto/aes.h
2017-06-28 01:26:24 -05:00

53 lines
1.9 KiB
C

/*
* Copyright (c) 2017 Stephen Heumann
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
struct aes_context {
unsigned char data[16];
unsigned char reserved1[17];
unsigned char key[32];
unsigned char reserved2[16*13];
};
/*
* The context structure must be in bank 0, preferably page-aligned.
* Note that a 256-byte (one page) context structure is sufficient for
* AES-128 and AES-192. The full length is needed only for AES-256.
*/
/*
* AES key expansion functions
* The appropriate one of these must be called before encrypting or decrypting.
* The key must be in the first 16/24/32 bytes of context->key before the call.
*/
void aes128_expandkey(struct aes_context *context);
void aes192_expandkey(struct aes_context *context);
void aes256_expandkey(struct aes_context *context);
/*
* AES encryption function
* This performs AES-128, AES-192, or AES-256 encryption, depending on the key.
* The unencrypted input and encrypted output are in context->data.
*/
void aes_encrypt(struct aes_context *context);
/*
* AES decryption functions
* The encrypted input and unencrypted output are in context->data.
*/
void aes128_decrypt(struct aes_context *context);
void aes192_decrypt(struct aes_context *context);
void aes256_decrypt(struct aes_context *context);