compiler/alib/acrypt.c

   1 /*
   2  * $Id$
   3  *
   4  * :ts=4
   5  *
   6  * Portable ISO 'C' (1994) runtime library for the Amiga computer
   7  * Copyright (c) 2002-2006 by Olaf Barthel <olsen (at) sourcery.han.de>
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  *
  14  *   - Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *
  17  *   - Neither the name of Olaf Barthel nor the names of contributors
  18  *     may be used to endorse or promote products derived from this
  19  *     software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #define ACrypt __ACrypt
  35
  36 #include <exec/types.h>
  37 #include <clib/alib_protos.h>
  38
  39 #undef ACrypt
  40
  41 /****************************************************************************/
  42
  43 #include <aros/debug.h>
  44
  45 /****************************************************************************/
  46
  47 #define OSIZE 12
  48
  49 /****************************************************************************/
  50
  51 UBYTE * ACrypt(UBYTE * buffer, const UBYTE * password, const UBYTE * user);
  52
  53 /****************************************************************************/
  54
  55 UBYTE *
  56 ACrypt(UBYTE * buffer, const UBYTE * password, const UBYTE * user)
  57 {
  58         UBYTE * result = NULL;
  59         LONG buf[OSIZE];
  60         LONG i,d,k;
  61
  62         //ENTER();
  63         //ALIVE
  64
  65         //assert( buffer != NULL && password != NULL && user != NULL );
  66
  67         //SHOWPOINTER(buffer);
  68         //SHOWSTRING(password);
  69         //SHOWSTRING(user);
  70         D(bug("[ACrypt] buffer %p password %s user %s\n", buffer, password, user));
  71
  72         if(buffer == NULL || password == NULL || user == NULL)
  73         {
  74                 //SHOWMSG("invalid parameters");
  75                 D(bug("[ACrypt] invalid parameters\n"));
  76                 goto out;
  77         }
  78
  79         for(i = 0 ; i < OSIZE ; i++)
  80         {
  81                 if((*password) != '\0')
  82                         d = (*password++);
  83                 else
  84                         d = i;
  85
  86                 if((*user) != '\0')
  87                         d += (*user++);
  88                 else
  89                         d += i;
  90
  91                 buf[i] = 'A' + d;
  92         }
  93
  94         for(i = 0 ; i < OSIZE ; i++)
  95         {
  96                 for(k = 0 ; k < OSIZE ; k++)
  97                         buf[i] = (buf[i] + buf[OSIZE - k - 1]) % 53;
  98
  99                 buffer[i] = buf[i] + 'A';
 100         }
 101
 102         buffer[OSIZE-1] = '\0';
 103
 104         //SHOWSTRING(buffer);
 105         D(bug("[ACrypt] buffer %s\n", buffer));
 106
 107         result = buffer;
 108
 109  out:
 110
 111         //RETURN(result);
 112         D(bug("[ACrypt] return value %s\n", result));
 113         return(result);
 114 }