library/amiga_acrypt.c
/*
* $Id: amiga_acrypt.c,v 1.5 2006-09-25 15:12:47 obarthel Exp $
*
* :ts=4
*
* Portable ISO 'C' (1994) runtime library for the Amiga computer
* Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Neither the name of Olaf Barthel nor the names of contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#define ACrypt __ACrypt
#include <exec/types.h>
#include <string.h>
#include <clib/alib_protos.h>
#undef ACrypt
/****************************************************************************/
#include "debug.h"
/****************************************************************************/
#define OSIZE 12
/****************************************************************************/
UBYTE * ACrypt(UBYTE * buffer, const UBYTE * password, const UBYTE * user);
/****************************************************************************/
UBYTE *
ACrypt(UBYTE * buffer, const UBYTE * password, const UBYTE * user)
{
UBYTE * result = NULL;
LONG buf[OSIZE];
LONG i,d,k;
ENTER();
assert( buffer != NULL && password != NULL && user != NULL );
SHOWPOINTER(buffer);
SHOWSTRING(password);
SHOWSTRING(user);
if(buffer == NULL || password == NULL || user == NULL)
{
SHOWMSG("invalid parameters");
goto out;
}
for(i = 0 ; i < OSIZE ; i++)
{
if((*password) != '\0')
d = (*password++);
else
d = i;
if((*user) != '\0')
d += (*user++);
else
d += i;
buf[i] = 'A' + d;
}
for(i = 0 ; i < OSIZE ; i++)
{
for(k = 0 ; k < OSIZE ; k++)
buf[i] = (buf[i] + buf[OSIZE - k - 1]) % 53;
buffer[i] = buf[i] + 'A';
}
buffer[OSIZE-1] = '\0';
SHOWSTRING(buffer);
result = buffer;
out:
RETURN(result);
return(result);
}