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/**

 * \file openssl.h

 *

 * \brief OpenSSL wrapper (definitions, inline functions).

 *

 *  Copyright (C) 2006-2010, Brainspark B.V.

 *

 *  This file is part of PolarSSL (http://www.polarssl.org)

 *  Lead Maintainer: Paul Bakker 

 *

 *  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.

 */

/*

 * OpenSSL wrapper contributed by David Barett

 */

#ifndef POLARSSL_OPENSSL_H

#define POLARSSL_OPENSSL_H

#include "aes.h"

#include "md5.h"

#include "rsa.h"

#include "sha1.h"

#define AES_SIZE                16

#define AES_BLOCK_SIZE          16

#define AES_KEY                 aes_context

#define MD5_CTX                 md5_context

#define SHA_CTX                 sha1_context

#define SHA1_Init( CTX ) \

        sha1_starts( (CTX) )

#define SHA1_Update(  CTX, BUF, LEN ) \

        sha1_update( (CTX), (unsigned char *)(BUF), (LEN) )

#define SHA1_Final( OUT, CTX ) \

        sha1_finish( (CTX), (OUT) )

#define MD5_Init( CTX ) \

        md5_starts( (CTX) )

#define MD5_Update( CTX, BUF, LEN ) \

        md5_update( (CTX), (unsigned char *)(BUF), (LEN) )

#define MD5_Final( OUT, CTX ) \

        md5_finish( (CTX), (OUT) )

#define AES_set_encrypt_key( KEY, KEYSIZE, CTX ) \

        aes_setkey_enc( (CTX), (KEY), (KEYSIZE) )

#define AES_set_decrypt_key( KEY, KEYSIZE, CTX ) \

        aes_setkey_dec( (CTX), (KEY), (KEYSIZE) )

#define AES_cbc_encrypt( INPUT, OUTPUT, LEN, CTX, IV, MODE ) \

        aes_crypt_cbc( (CTX), (MODE), (LEN), (IV), (INPUT), (OUTPUT) )

/*

 * RSA stuff follows. TODO: needs cleanup

 */

inline int __RSA_Passthrough( void *output, void *input, int size )

{

    memcpy( output, input, size );

    return size;

}

inline rsa_context* d2i_RSA_PUBKEY( void *ignore, unsigned char **bufptr,

                                    int len )

{

    unsigned char *buffer = *(unsigned char **) bufptr;

    rsa_context *rsa;

    /*

     * Not a general-purpose parser: only parses public key from *exactly*

     *   openssl genrsa -out privkey.pem 512 (or 1024)

     *   openssl rsa -in privkey.pem -out privatekey.der -outform der

     *   openssl rsa -in privkey.pem -out pubkey.der -outform der -pubout

     *

     * TODO: make a general-purpose parse

     */

    if( ignore != 0 || ( len != 94 && len != 162 ) )

        return( 0 );

    rsa = (rsa_context *) malloc( sizeof( rsa_rsa ) );

    if( rsa == NULL )

        return( 0 );

    memset( rsa, 0, sizeof( rsa_context ) );

    if( ( len ==  94 &&

          mpi_read_binary( &rsa->N, &buffer[ 25],  64 ) == 0 &&

          mpi_read_binary( &rsa->E, &buffer[ 91],   3 ) == 0 ) ||

        ( len == 162 &&

          mpi_read_binary( &rsa->N, &buffer[ 29], 128 ) == 0 ) &&

          mpi_read_binary( &rsa->E, &buffer[159],   3 ) == 0 )

    {

        /*

         * key read successfully

         */

        rsa->len = ( mpi_msb( &rsa->N ) + 7 ) >> 3;

        return( rsa );

    }

    else

    {

        memset( rsa, 0, sizeof( rsa_context ) );

        free( rsa );

        return( 0 );

    }

}

#define RSA                     rsa_context

#define RSA_PKCS1_PADDING       1 /* ignored; always encrypt with this */

#define RSA_size( CTX )         (CTX)->len

#define RSA_free( CTX )         rsa_free( CTX )

#define ERR_get_error( )        "ERR_get_error() not supported"

#define RSA_blinding_off( IGNORE )

#define d2i_RSAPrivateKey( a, b, c ) new rsa_context /* TODO: C++ bleh */

inline int RSA_public_decrypt ( int size, unsigned char* input, unsigned char* output, RSA* key, int ignore ) { int outsize=size; if( !rsa_pkcs1_decrypt( key, RSA_PUBLIC,  &outsize, input, output ) ) return outsize; else return -1; }

inline int RSA_private_decrypt( int size, unsigned char* input, unsigned char* output, RSA* key, int ignore ) { int outsize=size; if( !rsa_pkcs1_decrypt( key, RSA_PRIVATE, &outsize, input, output ) ) return outsize; else return -1; }

inline int RSA_public_encrypt ( int size, unsigned char* input, unsigned char* output, RSA* key, int ignore ) { if( !rsa_pkcs1_encrypt( key, RSA_PUBLIC,  size, input, output ) ) return RSA_size(key); else return -1; }

inline int RSA_private_encrypt( int size, unsigned char* input, unsigned char* output, RSA* key, int ignore ) { if( !rsa_pkcs1_encrypt( key, RSA_PRIVATE, size, input, output ) ) return RSA_size(key); else return -1; }

#ifdef __cplusplus

}

#endif

#endif /* openssl.h */