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/* This file is part of the KDE project
Copyright (C) 2001 George Staikos <[email protected]>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#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;
}
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