/****************************************************************************** * swcipher.cpp - code for class 'SWCipher'- a driver class that provides * cipher utilities. * * * Copyright 2009 CrossWire Bible Society (http://www.crosswire.org) * CrossWire Bible Society * P. O. Box 2528 * Tempe, AZ 85280-2528 * * This program 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 version 2. * * This program 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. * */ #include #include #include SWORD_NAMESPACE_START /****************************************************************************** * SWCipher Constructor - Initializes data for instance of SWCipher * */ SWCipher::SWCipher(unsigned char *key) { master.initialize(key, strlen((char *)key)); buf = 0; } /****************************************************************************** * SWCipher Destructor - Cleans up instance of SWCipher */ SWCipher::~SWCipher() { if (buf) free(buf); } char *SWCipher::Buf(const char *ibuf, unsigned long ilen) { if (ibuf) { if (buf) free(buf); if (!ilen) { len = strlen(buf); ilen = len + 1; } else len = ilen; buf = (char *) malloc(ilen); memcpy(buf, ibuf, ilen); cipher = false; } Decode(); return buf; } char *SWCipher::cipherBuf(unsigned long *ilen, const char *ibuf) { if (ibuf) { if (buf) free(buf); buf = (char *) malloc(*ilen+1); memcpy(buf, ibuf, *ilen); len = *ilen; cipher = true; } Encode(); *ilen = len; return buf; } /****************************************************************************** * SWCipher::Encode - This function "encodes" the input stream into the * output stream. * The GetChars() and SendChars() functions are * used to separate this method from the actual * i/o. */ void SWCipher::Encode(void) { if (!cipher) { work = master; for (unsigned long i = 0; i < len; i++) buf[i] = work.encrypt(buf[i]); cipher = true; } } /****************************************************************************** * SWCipher::Decode - This function "decodes" the input stream into the * output stream. * The GetChars() and SendChars() functions are * used to separate this method from the actual * i/o. */ void SWCipher::Decode(void) { if (cipher) { work = master; unsigned long i; for (i = 0; i < len; i++) buf[i] = work.decrypt(buf[i]); buf[i] = 0; cipher = false; } } /****************************************************************************** * SWCipher::setCipherKey - setter for a new CipherKey * */ void SWCipher::setCipherKey(const char *ikey) { unsigned char *key = (unsigned char *)ikey; master.initialize(key, strlen((char *)key)); } SWORD_NAMESPACE_END