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150 lines
2.8 KiB
150 lines
2.8 KiB
/* This file is part of the KDE project
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Copyright (C) 2001 George Staikos <staikos@kde.org>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "cbc.h"
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#include <string.h>
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CipherBlockChain::CipherBlockChain(BlockCipher *cipher) : _cipher(cipher) {
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_next = 0L;
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_register = 0L;
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_len = -1;
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_reader = _writer = 0L;
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if (cipher) {
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_blksz = cipher->blockSize();
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}
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}
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CipherBlockChain::~CipherBlockChain() {
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delete[] (char *)_register;
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_register = 0L;
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delete[] (char *)_next;
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_next = 0L;
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}
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bool CipherBlockChain::setKey(void *key, int bitlength) {
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if (_cipher) {
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return _cipher->setKey(key, bitlength);
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}
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return false;
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}
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int CipherBlockChain::keyLen() const {
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if (_cipher) {
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return _cipher->keyLen();
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}
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return -1;
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}
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bool CipherBlockChain::variableKeyLen() const {
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if (_cipher) {
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return _cipher->variableKeyLen();
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}
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return false;
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}
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bool CipherBlockChain::readyToGo() const {
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if (_cipher) {
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return _cipher->readyToGo();
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}
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return false;
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}
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int CipherBlockChain::encrypt(void *block, int len) {
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if (_cipher && !_reader) {
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int rc;
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_writer |= 1;
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if (!_register) {
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_register = new unsigned char[len];
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_len = len;
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memset(_register, 0, len);
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} else if (len > _len) {
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return -1;
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}
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// This might be optimizable
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char *tb = (char *)block;
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for (int i = 0; i < len; i++) {
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tb[i] ^= ((char *)_register)[i];
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}
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rc = _cipher->encrypt(block, len);
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if (rc != -1) {
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memcpy(_register, block, len);
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}
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return rc;
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}
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return -1;
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}
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int CipherBlockChain::decrypt(void *block, int len) {
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if (_cipher && !_writer) {
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int rc;
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_reader |= 1;
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if (!_register) {
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_register = new unsigned char[len];
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_len = len;
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memset(_register, 0, len);
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} else if (len > _len) {
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return -1;
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}
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if (!_next)
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_next = new unsigned char[_len];
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memcpy(_next, block, _len);
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rc = _cipher->decrypt(block, len);
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if (rc != -1) {
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// This might be optimizable
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char *tb = (char *)block;
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for (int i = 0; i < len; i++) {
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tb[i] ^= ((char *)_register)[i];
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}
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}
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void *temp;
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temp = _next;
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_next = _register;
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_register = temp;
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return rc;
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}
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return -1;
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}
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