/* * irc-crypt.c - IRC crypt routines * * Copyright (C) 2000 Stefan Jahn <stefan@lkcc.org> * * This 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, or (at your option) * any later version. *  * This software 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 package; see the file COPYING.  If not, write to * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA.   * * $Id: irc-crypt.c,v 1.8 2001/08/01 10:16:22 ela Exp $ * */#if HAVE_CONFIG_H# include <config.h>#endif#if ENABLE_IRC_PROTO#define _GNU_SOURCE#include <string.h>#ifdef __MINGW32__# include <winsock2.h>#endif#include "libserveez.h"#include "irc-proto.h"#include "irc-crypt.h"/* * Generate a key for the de- and encryption routine. */svz_uint8_tirc_gen_key (char *pass){  svz_uint8_t *p;  int n;  svz_uint8_t key;  key = 0;  n = 0;  p = (svz_uint8_t *) pass;  while (*p)    {      key += (svz_uint8_t) ((*p + n) ^ IRC_CRYPT_BYTE);      n++;      p++;    }  return key;}/* * Encrypt a string by a given key. */voidirc_encrypt_text (char *text, svz_uint8_t key){  char crypt[MAX_MSG_LEN];  char *t, *c;  svz_uint8_t code;  memset (crypt, 0, MAX_MSG_LEN);  t = text;  c = crypt;  while (*t)    {      code = (svz_uint8_t) (*t ^ key);      if (code < (svz_uint8_t) 0x20 || code == IRC_CRYPT_PREFIX)	{	  *c++ = IRC_CRYPT_PREFIX;	  *c++ = (char) (code + IRC_CRYPT_PREFIX);	}      else	{	  *c++ = code;	}      t++;    }  strcpy (text, crypt);}/* * Decrypt a string by a given key. */char *irc_decrypt_text (char *crypt, svz_uint8_t key){  static char text[MAX_MSG_LEN];  char *t, *c;  memset (text, 0, MAX_MSG_LEN);  t = text;  c = crypt;  while (*c)    {      if (*c == IRC_CRYPT_PREFIX)	{	  c++;	  *t++ = (char) ((*c - IRC_CRYPT_PREFIX) ^ key);	}      else	{	  *t++ = (char) (*c ^ key);	}      c++;    }  return text;}#else /* ENABLE_IRC_PROTO */int irc_crypt_dummy; /* Shut up compiler. */#endif /* ENABLE_IRC_PROTO */