aes.h
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/*
* Copyright (c) 2011 The Chromium OS Authors.
* (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef _AES_REF_H_
#define _AES_REF_H_
/*
* AES encryption library, with small code size, supporting only 128-bit AES
*
* AES is a stream cipher which works a block at a time, with each block
* in this case being AES_KEY_LENGTH bytes.
*/
enum {
AES_STATECOLS = 4, /* columns in the state & expanded key */
AES_KEYCOLS = 4, /* columns in a key */
AES_ROUNDS = 10, /* rounds in encryption */
AES_KEY_LENGTH = 128 / 8,
AES_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES_ROUNDS + 1),
};
/**
* Expand a key into a key schedule, which is then used for the other
* operations.
*
* \param key Key, of length AES_KEY_LENGTH bytes
* \param expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH
*/
void aes_expand_key(u8 *key, u8 *expkey);
/**
* Encrypt a single block of data
*
* in Input data
* expkey Expanded key to use for encryption (from aes_expand_key())
* out Output data
*/
void aes_encrypt(u8 *in, u8 *expkey, u8 *out);
/**
* Decrypt a single block of data
*
* in Input data
* expkey Expanded key to use for decryption (from aes_expand_key())
* out Output data
*/
void aes_decrypt(u8 *in, u8 *expkey, u8 *out);
#endif /* _AES_REF_H_ */