File indexing completed on 2024-06-16 03:53:04

 /*
     This file is part of the KDE project
     SPDX-FileCopyrightText: 2001 George Staikos <staikos@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "cbc.h"
 #include <string.h>
 
 CipherBlockChain::CipherBlockChain(BlockCipher *cipher) : _cipher(cipher)
 {
     _next = 0L;
     _register = 0L;
     _len = -1;
     _reader = _writer = 0L;
     if (cipher) {
         _blksz = cipher->blockSize();
     }
 }
 
 CipherBlockChain::~CipherBlockChain()
 {
     delete[](char *)_register;
     _register = 0L;
     delete[](char *)_next;
     _next = 0L;
 }
 
 bool CipherBlockChain::setKey(void *key, int bitlength)
 {
     if (_cipher) {
         return _cipher->setKey(key, bitlength);
     }
     return false;
 }
 
 int CipherBlockChain::keyLen() const
 {
     if (_cipher) {
         return _cipher->keyLen();
     }
     return -1;
 }
 
 bool CipherBlockChain::variableKeyLen() const
 {
     if (_cipher) {
         return _cipher->variableKeyLen();
     }
     return false;
 }
 
 bool CipherBlockChain::readyToGo() const
 {
     if (_cipher) {
         return _cipher->readyToGo();
     }
     return false;
 }
 
 int CipherBlockChain::encrypt(void *block, int len)
 {
     if (_cipher && !_reader) {
         int rc;
 
         _writer |= 1;
 
         if (!_register) {
             _register = new unsigned char[len];
             _len = len;
             memset(_register, 0, len);
         } else if (len > _len) {
             return -1;
         }
 
         // This might be optimizable
         char *tb = (char *)block;
         for (int i = 0; i < len; i++) {
             tb[i] ^= ((char *)_register)[i];
         }
 
         rc = _cipher->encrypt(block, len);
 
         if (rc != -1) {
             memcpy(_register, block, len);
         }
 
         return rc;
     }
     return -1;
 }
 
 int CipherBlockChain::decrypt(void *block, int len)
 {
     if (_cipher && !_writer) {
         int rc;
 
         _reader |= 1;
 
         if (!_register) {
             _register = new unsigned char[len];
             _len = len;
             memset(_register, 0, len);
         } else if (len > _len) {
             return -1;
         }
 
         if (!_next) {
             _next = new unsigned char[_len];
         }
         memcpy(_next, block, _len);
 
         rc = _cipher->decrypt(block, len);
 
         if (rc != -1) {
             // This might be optimizable
             char *tb = (char *)block;
             for (int i = 0; i < len; i++) {
                 tb[i] ^= ((char *)_register)[i];
             }
         }
 
         void *temp;
         temp = _next;
         _next = _register;
         _register = temp;
 
         return rc;
     }
     return -1;
 }