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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/*
* XSEC
*
* TXFMCipher := Class that performs encryption and decryption transforms
*
* $Id: TXFMCipher.cpp 1352681 2012-06-21 20:58:40Z scantor $
*
*/
// XSEC
#include <xsec/framework/XSECDefs.hpp>
#include <xsec/transformers/TXFMCipher.hpp>
#include <xsec/utils/XSECPlatformUtils.hpp>
#include <xsec/framework/XSECException.hpp>
XERCES_CPP_NAMESPACE_USE
TXFMCipher::TXFMCipher(DOMDocument *doc,
XSECCryptoKey * key,
bool encrypt,
XSECCryptoSymmetricKey::SymmetricKeyMode mode,
unsigned int taglen) :
TXFMBase(doc),
m_doEncrypt(encrypt),
m_taglen(taglen),
mp_cipher(NULL),
m_remaining(0) {
if (key && key->getKeyType() == XSECCryptoKey::KEY_SYMMETRIC)
mp_cipher = key->clone();
if (!mp_cipher) {
throw XSECException(XSECException::CryptoProviderError,
"Error cloning key, or not a symmetric key");
}
m_complete = false;
try {
if (m_doEncrypt)
((XSECCryptoSymmetricKey *) (mp_cipher))->encryptInit((mode != XSECCryptoSymmetricKey::MODE_GCM), mode);
else
((XSECCryptoSymmetricKey *) (mp_cipher))->decryptInit((mode != XSECCryptoSymmetricKey::MODE_GCM), mode);
}
catch (...) {
delete mp_cipher;
mp_cipher = NULL;
throw;
}
};
TXFMCipher::~TXFMCipher() {
delete mp_cipher;
};
// Methods to set the inputs
void TXFMCipher::setInput(TXFMBase *newInput) {
input = newInput;
// Set up for comments
keepComments = input->getCommentsStatus();
}
// Methods to get tranform output type and input requirement
TXFMBase::ioType TXFMCipher::getInputType(void) {
return TXFMBase::BYTE_STREAM;
}
TXFMBase::ioType TXFMCipher::getOutputType(void) {
return TXFMBase::BYTE_STREAM;
}
TXFMBase::nodeType TXFMCipher::getNodeType(void) {
return TXFMBase::DOM_NODE_NONE;
}
// Methods to get output data
unsigned int TXFMCipher::readBytes(XMLByte * const toFill, unsigned int maxToFill) {
unsigned int ret, fill, leftToFill;
ret = 0; // How much have we copied?
leftToFill = maxToFill; // Still have to copy in entire thing
while (ret != maxToFill && (m_complete == false || m_remaining > 0)) {
if (m_remaining != 0) {
// Copy anything remaining in the buffer to the output
fill = (leftToFill > m_remaining ? m_remaining : leftToFill);
memcpy(&toFill[ret], m_outputBuffer, fill);
if (fill < m_remaining)
memmove(m_outputBuffer, m_outputBuffer + fill, (m_remaining - fill));
m_remaining -= fill;
leftToFill -= fill;
ret += fill;
}
// Now do some crypting
if (m_complete == false && m_remaining == 0) {
unsigned int sz = input->readBytes(m_inputBuffer, 2048);
XSECCryptoSymmetricKey * symCipher =
(XSECCryptoSymmetricKey*) mp_cipher;
if (m_doEncrypt) {
if (sz == 0) {
m_complete = true;
m_remaining = symCipher->encryptFinish(m_outputBuffer, 3072, m_taglen);
}
else
m_remaining = symCipher->encrypt(m_inputBuffer, m_outputBuffer, sz, 3072);
}
else {
if (sz == 0) {
m_complete = true;
m_remaining = symCipher->decryptFinish(m_outputBuffer, 3072);
}
else
m_remaining = symCipher->decrypt(m_inputBuffer, m_outputBuffer, sz, 3072);
}
}
}
return ret;
}
DOMDocument *TXFMCipher::getDocument() {
return NULL;
}
DOMNode * TXFMCipher::getFragmentNode() {
return NULL; // Return a null node
}
const XMLCh * TXFMCipher::getFragmentId() {
return NULL; // Empty string
}
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