184 lines
5.8 KiB
C
184 lines
5.8 KiB
C
/**
|
|
* \file aes.h
|
|
*
|
|
* \brief AES block cipher
|
|
*
|
|
* Copyright (C) 2006-2010, Brainspark B.V.
|
|
*
|
|
* This file is part of PolarSSL (http://www.polarssl.org)
|
|
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* 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.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
#ifndef POLARSSL_AES_H
|
|
#define POLARSSL_AES_H
|
|
|
|
#include <string.h>
|
|
|
|
#ifdef _MSC_VER
|
|
#include <basetsd.h>
|
|
typedef UINT32 uint32_t;
|
|
#else
|
|
#include <inttypes.h>
|
|
#endif
|
|
|
|
#define AES_ENCRYPT 1
|
|
#define AES_DECRYPT 0
|
|
|
|
#define POLARSSL_ERR_AES_INVALID_KEY_LENGTH -0x0020 /**< Invalid key length. */
|
|
#define POLARSSL_ERR_AES_INVALID_INPUT_LENGTH -0x0022 /**< Invalid data input length. */
|
|
|
|
/**
|
|
* \brief AES context structure
|
|
*/
|
|
typedef struct
|
|
{
|
|
int nr; /*!< number of rounds */
|
|
uint32_t *rk; /*!< AES round keys */
|
|
uint32_t buf[68]; /*!< unaligned data */
|
|
}
|
|
aes_context;
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* \brief AES key schedule (encryption)
|
|
*
|
|
* \param ctx AES context to be initialized
|
|
* \param key encryption key
|
|
* \param keysize must be 128, 192 or 256
|
|
*
|
|
* \return 0 if successful, or POLARSSL_ERR_AES_INVALID_KEY_LENGTH
|
|
*/
|
|
int aes_setkey_enc( aes_context *ctx, const unsigned char *key, unsigned int keysize );
|
|
|
|
/**
|
|
* \brief AES key schedule (decryption)
|
|
*
|
|
* \param ctx AES context to be initialized
|
|
* \param key decryption key
|
|
* \param keysize must be 128, 192 or 256
|
|
*
|
|
* \return 0 if successful, or POLARSSL_ERR_AES_INVALID_KEY_LENGTH
|
|
*/
|
|
int aes_setkey_dec( aes_context *ctx, const unsigned char *key, unsigned int keysize );
|
|
|
|
/**
|
|
* \brief AES-ECB block encryption/decryption
|
|
*
|
|
* \param ctx AES context
|
|
* \param mode AES_ENCRYPT or AES_DECRYPT
|
|
* \param input 16-byte input block
|
|
* \param output 16-byte output block
|
|
*
|
|
* \return 0 if successful
|
|
*/
|
|
int aes_crypt_ecb( aes_context *ctx,
|
|
int mode,
|
|
const unsigned char input[16],
|
|
unsigned char output[16] );
|
|
|
|
/**
|
|
* \brief AES-CBC buffer encryption/decryption
|
|
* Length should be a multiple of the block
|
|
* size (16 bytes)
|
|
*
|
|
* \param ctx AES context
|
|
* \param mode AES_ENCRYPT or AES_DECRYPT
|
|
* \param length length of the input data
|
|
* \param iv initialization vector (updated after use)
|
|
* \param input buffer holding the input data
|
|
* \param output buffer holding the output data
|
|
*
|
|
* \return 0 if successful, or POLARSSL_ERR_AES_INVALID_INPUT_LENGTH
|
|
*/
|
|
int aes_crypt_cbc( aes_context *ctx,
|
|
int mode,
|
|
size_t length,
|
|
unsigned char iv[16],
|
|
const unsigned char *input,
|
|
unsigned char *output );
|
|
|
|
/**
|
|
* \brief AES-CFB128 buffer encryption/decryption.
|
|
*
|
|
* Note: Due to the nature of CFB you should use the same key schedule for
|
|
* both encryption and decryption. So a context initialized with
|
|
* aes_setkey_enc() for both AES_ENCRYPT and AES_DECRYPT.
|
|
*
|
|
* both
|
|
* \param ctx AES context
|
|
* \param mode AES_ENCRYPT or AES_DECRYPT
|
|
* \param length length of the input data
|
|
* \param iv_off offset in IV (updated after use)
|
|
* \param iv initialization vector (updated after use)
|
|
* \param input buffer holding the input data
|
|
* \param output buffer holding the output data
|
|
*
|
|
* \return 0 if successful
|
|
*/
|
|
int aes_crypt_cfb128( aes_context *ctx,
|
|
int mode,
|
|
size_t length,
|
|
size_t *iv_off,
|
|
unsigned char iv[16],
|
|
const unsigned char *input,
|
|
unsigned char *output );
|
|
|
|
/**
|
|
* \brief AES-CTR buffer encryption/decryption
|
|
*
|
|
* Warning: You have to keep the maximum use of your counter in mind!
|
|
*
|
|
* Note: Due to the nature of CTR you should use the same key schedule for
|
|
* both encryption and decryption. So a context initialized with
|
|
* aes_setkey_enc() for both AES_ENCRYPT and AES_DECRYPT.
|
|
*
|
|
* \param length The length of the data
|
|
* \param nc_off The offset in the current stream_block (for resuming
|
|
* within current cipher stream). The offset pointer to
|
|
* should be 0 at the start of a stream.
|
|
* \param nonce_counter The 128-bit nonce and counter.
|
|
* \param stream_block The saved stream-block for resuming. Is overwritten
|
|
* by the function.
|
|
* \param input The input data stream
|
|
* \param output The output data stream
|
|
*
|
|
* \return 0 if successful
|
|
*/
|
|
int aes_crypt_ctr( aes_context *ctx,
|
|
size_t length,
|
|
size_t *nc_off,
|
|
unsigned char nonce_counter[16],
|
|
unsigned char stream_block[16],
|
|
const unsigned char *input,
|
|
unsigned char *output );
|
|
/**
|
|
* \brief Checkup routine
|
|
*
|
|
* \return 0 if successful, or 1 if the test failed
|
|
*/
|
|
int aes_self_test( int verbose );
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* aes.h */
|