124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
/**
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* \file aes.h
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*
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* Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
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*
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* Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_AES_H
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#define POLARSSL_AES_H
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#define AES_ENCRYPT 1
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#define AES_DECRYPT 0
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/**
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* \brief AES context structure
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*/
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typedef struct
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{
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int nr; /*!< number of rounds */
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unsigned long *rk; /*!< AES round keys */
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unsigned long buf[68]; /*!< unaligned data */
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}
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aes_context;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief AES key schedule (encryption)
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*
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* \param ctx AES context to be initialized
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* \param key encryption key
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* \param keysize must be 128, 192 or 256
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*/
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void aes_setkey_enc( aes_context *ctx, unsigned char *key, int keysize );
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/**
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* \brief AES key schedule (decryption)
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*
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* \param ctx AES context to be initialized
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* \param key decryption key
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* \param keysize must be 128, 192 or 256
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*/
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void aes_setkey_dec( aes_context *ctx, unsigned char *key, int keysize );
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/**
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* \brief AES-ECB block encryption/decryption
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*
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* \param ctx AES context
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* \param mode AES_ENCRYPT or AES_DECRYPT
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* \param input 16-byte input block
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* \param output 16-byte output block
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*/
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void aes_crypt_ecb( aes_context *ctx,
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int mode,
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unsigned char input[16],
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unsigned char output[16] );
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/**
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* \brief AES-CBC buffer encryption/decryption
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* Length should be a multiple of the block
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* size (16 bytes)
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*
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* \param ctx AES context
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* \param mode AES_ENCRYPT or AES_DECRYPT
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* \param length length of the input data
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* \param iv initialization vector (updated after use)
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* \param input buffer holding the input data
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* \param output buffer holding the output data
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*/
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void aes_crypt_cbc( aes_context *ctx,
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int mode,
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int length,
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unsigned char iv[16],
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unsigned char *input,
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unsigned char *output );
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/**
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* \brief AES-CFB128 buffer encryption/decryption.
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*
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* \param ctx AES context
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* \param mode AES_ENCRYPT or AES_DECRYPT
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* \param length length of the input data
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* \param iv_off offset in IV (updated after use)
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* \param iv initialization vector (updated after use)
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* \param input buffer holding the input data
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* \param output buffer holding the output data
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*/
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void aes_crypt_cfb128( aes_context *ctx,
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int mode,
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int length,
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int *iv_off,
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unsigned char iv[16],
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unsigned char *input,
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unsigned char *output );
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/**
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* \brief Checkup routine
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*
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* \return 0 if successful, or 1 if the test failed
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*/
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int aes_self_test( int verbose );
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#ifdef __cplusplus
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}
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#endif
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#endif /* aes.h */
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