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/**************************************************************************
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* *
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* Copyright (C) 2007 by Tarek Saidi <tarek.saidi@arcor.de> *
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* Copyright (c) 2003 Dr Brian Gladman, Worcester, UK *
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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; version 2 of the License. *
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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 *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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/*
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This file contains the definitions required to use AES in C. See aesopt.h
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for optimisation details.
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*/
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#ifndef _AES_H
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#define _AES_H
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#include <stdlib.h>
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/* This include is used to find 8 & 32 bit unsigned integer types */
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#include "aes_tdefs.h"
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#if defined(__cplusplus)
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extern "C"
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{
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#endif
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#define AES_128 /* define if AES with 128 bit keys is needed */
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#define AES_192 /* define if AES with 192 bit keys is needed */
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#define AES_256 /* define if AES with 256 bit keys is needed */
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#define AES_VAR /* define if a variable key size is needed */
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#define AES_MODES /* define if support is needed for modes */
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/* The following must also be set in assembler files if being used */
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#define AES_ENCRYPT /* if support for encryption is needed */
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#define AES_DECRYPT /* if support for decryption is needed */
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#define AES_ERR_CHK /* for parameter checks & error return codes */
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#define AES_REV_DKS /* define to reverse decryption key schedule */
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#define AES_BLOCK_SIZE 16 /* the AES block size in bytes */
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#define N_COLS 4 /* the number of columns in the state */
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/* The key schedule length is 11, 13 or 15 16-byte blocks for 128, */
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/* 192 or 256-bit keys respectively. That is 176, 208 or 240 bytes */
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/* or 44, 52 or 60 32-bit words. */
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#if defined( AES_VAR ) || defined( AES_256 )
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#define KS_LENGTH 60
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#elif defined( AES_192 )
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#define KS_LENGTH 52
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#else
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#define KS_LENGTH 44
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#endif
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#if defined( AES_ERR_CHK )
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#define aes_rval int_ret
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#else
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#define aes_rval void_ret
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#endif
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/* the character array 'inf' in the following structures is used */
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/* to hold AES context information. This AES code uses cx->inf.b[0] */
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/* to hold the number of rounds multiplied by 16. The other three */
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/* elements can be used by code that implements additional modes */
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typedef union
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{ uint_32t l;
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uint_8t b[4];
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} aes_inf;
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typedef struct
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{ uint_32t ks[KS_LENGTH];
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aes_inf inf;
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} aes_encrypt_ctx;
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typedef struct
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{ uint_32t ks[KS_LENGTH];
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aes_inf inf;
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} aes_decrypt_ctx;
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/* This routine must be called before first use if non-static */
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/* tables are being used */
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aes_rval gen_tabs(void);
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/* Key lengths in the range 16 <= key_len <= 32 are given in bytes, */
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/* those in the range 128 <= key_len <= 256 are given in bits */
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#if defined( AES_ENCRYPT )
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#if defined(AES_128) || defined(AES_VAR)
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aes_rval aes_encrypt_key128(const unsigned char *key, aes_encrypt_ctx cx[1]);
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#endif
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#if defined(AES_192) || defined(AES_VAR)
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aes_rval aes_encrypt_key192(const unsigned char *key, aes_encrypt_ctx cx[1]);
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#endif
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#if defined(AES_256) || defined(AES_VAR)
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aes_rval aes_encrypt_key256(const unsigned char *key, aes_encrypt_ctx cx[1]);
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#endif
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#if defined(AES_VAR)
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aes_rval aes_encrypt_key(const unsigned char *key, int key_len, aes_encrypt_ctx cx[1]);
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#endif
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aes_rval aes_encrypt(const unsigned char *in, unsigned char *out, const aes_encrypt_ctx cx[1]);
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#endif
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#if defined( AES_DECRYPT )
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#if defined(AES_128) || defined(AES_VAR)
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aes_rval aes_decrypt_key128(const unsigned char *key, aes_decrypt_ctx cx[1]);
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#endif
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#if defined(AES_192) || defined(AES_VAR)
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aes_rval aes_decrypt_key192(const unsigned char *key, aes_decrypt_ctx cx[1]);
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#endif
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#if defined(AES_256) || defined(AES_VAR)
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aes_rval aes_decrypt_key256(const unsigned char *key, aes_decrypt_ctx cx[1]);
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#endif
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#if defined(AES_VAR)
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aes_rval aes_decrypt_key(const unsigned char *key, int key_len, aes_decrypt_ctx cx[1]);
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#endif
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aes_rval aes_decrypt(const unsigned char *in, unsigned char *out, const aes_decrypt_ctx cx[1]);
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#endif
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#if defined(AES_MODES)
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aes_rval aes_ecb_encrypt(const unsigned char *ibuf, unsigned char *obuf,
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int len, const aes_encrypt_ctx cx[1]);
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aes_rval aes_ecb_decrypt(const unsigned char *ibuf, unsigned char *obuf,
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int len, const aes_decrypt_ctx cx[1]);
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aes_rval aes_cbc_encrypt(const unsigned char *ibuf, unsigned char *obuf,
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int len, unsigned char *iv, const aes_encrypt_ctx cx[1]);
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aes_rval aes_cbc_decrypt(const unsigned char *ibuf, unsigned char *obuf,
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int len, unsigned char *iv, const aes_decrypt_ctx cx[1]);
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aes_rval aes_mode_reset(aes_encrypt_ctx cx[1]);
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aes_rval aes_cfb_encrypt(const unsigned char *ibuf, unsigned char *obuf,
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int len, unsigned char *iv, aes_encrypt_ctx cx[1]);
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aes_rval aes_cfb_decrypt(const unsigned char *ibuf, unsigned char *obuf,
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int len, unsigned char *iv, aes_encrypt_ctx cx[1]);
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#define aes_ofb_encrypt aes_ofb_crypt
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#define aes_ofb_decrypt aes_ofb_crypt
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aes_rval aes_ofb_crypt(const unsigned char *ibuf, unsigned char *obuf,
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int len, unsigned char *iv, aes_encrypt_ctx cx[1]);
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typedef void cbuf_inc(unsigned char *cbuf);
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#define aes_ctr_encrypt aes_ctr_crypt
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#define aes_ctr_decrypt aes_ctr_crypt
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aes_rval aes_ctr_crypt(const unsigned char *ibuf, unsigned char *obuf,
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int len, unsigned char *cbuf, cbuf_inc ctr_inc, aes_encrypt_ctx cx[1]);
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#endif
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#if defined(__cplusplus)
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}
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#endif
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#endif
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