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136 lines
4.3 KiB
C
136 lines
4.3 KiB
C
/*
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* Harbour Project source code:
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* PRG functions for MD5 encryption/decryption using
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* CFB (cipher feedback) mode
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*
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* Copyright 2012 Przemyslaw Czerpak <druzus / at / priv.onet.pl>
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* www - http://harbour-project.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, or (at your option)
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* 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
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* along with this software; see the file COPYING.txt. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
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*
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* As a special exception, the Harbour Project gives permission for
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* additional uses of the text contained in its release of Harbour.
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*
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* The exception is that, if you link the Harbour libraries with other
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* files to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the Harbour library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the Harbour
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* Project under the name Harbour. If you copy code from other
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* Harbour Project or Free Software Foundation releases into a copy of
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* Harbour, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for Harbour, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*
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*/
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#include "hbapi.h"
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#include "hbapiitm.h"
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#include "hbchksum.h"
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static void hb_md5_init_seed( char * vect, const char * pszKey, int iLen )
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{
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hb_md5( pszKey, iLen, vect );
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}
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static void hb_md5_next_seed( char * vect, const char * pszKey, int iLen )
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{
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int i;
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for( i = 0; i < 16; ++i )
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vect[ i ] ^= pszKey[ i % iLen ];
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hb_md5( vect, 16, vect );
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}
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/* hb_MD5Encrypt( <cText>, <cPasswd> ) -> <cCipher>
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*/
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HB_FUNC( HB_MD5ENCRYPT )
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{
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PHB_ITEM pData = hb_param( 1, HB_IT_STRING );
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if( pData && hb_parclen( 2 ) > 0 )
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{
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HB_SIZE nLen = hb_itemGetCLen( pData ), n;
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if( nLen )
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{
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const char * pszSource = hb_itemGetCPtr( pData );
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char * pszData = ( char * ) hb_xgrab( nLen + 1 );
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const char * pszKey = hb_parc( 2 );
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int iLen = ( int ) hb_parclen( 2 );
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char vect[ 16 ];
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hb_md5_init_seed( vect, pszKey, iLen );
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for( n = 0; n < nLen; ++n )
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{
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int i = ( int ) ( n & 0x0F );
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if( i == 0 )
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hb_md5_next_seed( vect, pszKey, iLen );
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pszData[ n ] = ( vect[ i ] ^= pszSource[ n ] );
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}
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hb_retclen_buffer( pszData, nLen );
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}
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else
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hb_retc_null();
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}
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}
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/* hb_MD5Decrypt( <cCipher>, <cPasswd> ] ) -> <cText>
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*/
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HB_FUNC( HB_MD5DECRYPT )
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{
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PHB_ITEM pData = hb_param( 1, HB_IT_STRING );
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if( pData && hb_parclen( 2 ) > 0 )
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{
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HB_SIZE nLen = hb_itemGetCLen( pData ), n;
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if( nLen )
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{
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const char * pszSource = hb_itemGetCPtr( pData );
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char * pszData = ( char * ) hb_xgrab( nLen + 1 );
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const char * pszKey = hb_parc( 2 );
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int iLen = ( int ) hb_parclen( 2 );
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char vect[ 16 ];
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hb_md5_init_seed( vect, pszKey, iLen );
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for( n = 0; n < nLen; ++n )
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{
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int i = ( int ) ( n & 0x0F );
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if( i == 0 )
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hb_md5_next_seed( vect, pszKey, iLen );
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pszData[ n ] = ( vect[ i ] ^ pszSource[ n ] );
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vect[ i ] = pszSource[ n ];
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}
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hb_retclen_buffer( pszData, nLen );
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}
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else
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hb_retc_null();
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}
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}
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