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 <string.h>
  38 #include <clib/alib_protos.h>
  39
  40 #undef ACrypt
  41
  42 /****************************************************************************/
  43
  44 //#include "debug.h"
  45 #include <aros/debug.h>
  46
  47 /****************************************************************************/
  48
  49 #define OSIZE 12
  50
  51 /****************************************************************************/
  52
  53 UBYTE * ACrypt(UBYTE * buffer, const UBYTE * password, const UBYTE * user);
  54
  55 /****************************************************************************/
  56
  57 UBYTE *
  58 ACrypt(UBYTE * buffer, const UBYTE * password, const UBYTE * user)
  59 {
  60         UBYTE * result = NULL;
  61         LONG buf[OSIZE];
  62         LONG i,d,k;
  63
  64         //ENTER();
  65         ALIVE
  66
  67         //assert( buffer != NULL && password != NULL && user != NULL );
  68
  69         //SHOWPOINTER(buffer);
  70         //SHOWSTRING(password);
  71         //SHOWSTRING(user);
  72         D(bug("[ACrypt] buffer %p password %s user %s\n", buffer, password, user));
  73
  74         if(buffer == NULL || password == NULL || user == NULL)
  75         {
  76                 //SHOWMSG("invalid parameters");
  77                 D(bug("[ACrypt] invalid parameters\n"));
  78                 goto out;
  79         }
  80
  81         for(i = 0 ; i < OSIZE ; i++)
  82         {
  83                 if((*password) != '\0')
  84                         d = (*password++);
  85                 else
  86                         d = i;
  87
  88                 if((*user) != '\0')
  89                         d += (*user++);
  90                 else
  91                         d += i;
  92
  93                 buf[i] = 'A' + d;
  94         }
  95
  96         for(i = 0 ; i < OSIZE ; i++)
  97         {
  98                 for(k = 0 ; k < OSIZE ; k++)
  99                         buf[i] = (buf[i] + buf[OSIZE - k - 1]) % 53;
 100
 101                 buffer[i] = buf[i] + 'A';
 102         }
 103
 104         buffer[OSIZE-1] = '\0';
 105
 106         //SHOWSTRING(buffer);
 107         D(bug("[ACrypt] buffer %s\n", buffer));
 108
 109         result = buffer;
 110
 111  out:
 112
 113         //RETURN(result);
 114         D(bug("[ACrypt] return value %s\n", result));
 115         return(result);
 116 }