PolarSSL v1.1.4
Data Structures | Defines | Functions
aes.h File Reference

AES block cipher. More...

#include <string.h>
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Data Structures

struct  aes_context
 AES context structure. More...

Defines

#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.

Functions

int aes_setkey_enc (aes_context *ctx, const unsigned char *key, unsigned int keysize)
 AES key schedule (encryption)
int aes_setkey_dec (aes_context *ctx, const unsigned char *key, unsigned int keysize)
 AES key schedule (decryption)
int aes_crypt_ecb (aes_context *ctx, int mode, const unsigned char input[16], unsigned char output[16])
 AES-ECB block encryption/decryption.
int aes_crypt_cbc (aes_context *ctx, int mode, size_t length, unsigned char iv[16], const unsigned char *input, unsigned char *output)
 AES-CBC buffer encryption/decryption Length should be a multiple of the block size (16 bytes)
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)
 AES-CFB128 buffer encryption/decryption.
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)
int aes_self_test (int verbose)
 Checkup routine.

Detailed Description

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.

Definition in file aes.h.


Define Documentation

#define AES_DECRYPT   0

Definition at line 33 of file aes.h.

#define AES_ENCRYPT   1

Definition at line 32 of file aes.h.

Invalid data input length.

Definition at line 36 of file aes.h.

Invalid key length.

Definition at line 35 of file aes.h.


Function Documentation

int aes_crypt_cbc ( aes_context ctx,
int  mode,
size_t  length,
unsigned char  iv[16],
const unsigned char *  input,
unsigned char *  output 
)

AES-CBC buffer encryption/decryption Length should be a multiple of the block size (16 bytes)

Parameters:
ctxAES context
modeAES_ENCRYPT or AES_DECRYPT
lengthlength of the input data
ivinitialization vector (updated after use)
inputbuffer holding the input data
outputbuffer holding the output data
Returns:
0 if successful, or POLARSSL_ERR_AES_INVALID_INPUT_LENGTH
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 
)

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

Parameters:
ctxAES context
modeAES_ENCRYPT or AES_DECRYPT
lengthlength of the input data
iv_offoffset in IV (updated after use)
ivinitialization vector (updated after use)
inputbuffer holding the input data
outputbuffer holding the output data
Returns:
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 
)
int aes_crypt_ecb ( aes_context ctx,
int  mode,
const unsigned char  input[16],
unsigned char  output[16] 
)

AES-ECB block encryption/decryption.

Parameters:
ctxAES context
modeAES_ENCRYPT or AES_DECRYPT
input16-byte input block
output16-byte output block
Returns:
0 if successful
int aes_self_test ( int  verbose)

Checkup routine.

Returns:
0 if successful, or 1 if the test failed
int aes_setkey_dec ( aes_context ctx,
const unsigned char *  key,
unsigned int  keysize 
)

AES key schedule (decryption)

Parameters:
ctxAES context to be initialized
keydecryption key
keysizemust be 128, 192 or 256
Returns:
0 if successful, or POLARSSL_ERR_AES_INVALID_KEY_LENGTH
int aes_setkey_enc ( aes_context ctx,
const unsigned char *  key,
unsigned int  keysize 
)

AES key schedule (encryption)

Parameters:
ctxAES context to be initialized
keyencryption key
keysizemust be 128, 192 or 256
Returns:
0 if successful, or POLARSSL_ERR_AES_INVALID_KEY_LENGTH