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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
*
* TXFMHash := Class that performs a hash/HMAC transform
*
* $Id$
*
*/
#include <xsec/framework/XSECException.hpp>
#include <xsec/transformers/TXFMHash.hpp>
#include <xsec/utils/XSECPlatformUtils.hpp>
XERCES_CPP_NAMESPACE_USE
TXFMHash::TXFMHash(DOMDocument* doc, XSECCryptoHash::HashType type, const XSECCryptoKey* key) :
TXFMBase(doc), mp_h(NULL), md_value(NULL), md_len(0), toOutput(0) {
if (key == NULL) {
// Get a hash worker
mp_h = XSECPlatformUtils::g_cryptoProvider->hash(type);
if (!mp_h) {
throw XSECException(XSECException::CryptoProviderError,
"Error requesting hash object from Crypto Provider");
}
}
else {
// Get an HMAC worker
mp_h = XSECPlatformUtils::g_cryptoProvider->HMAC(type);
if (!mp_h) {
throw XSECException(XSECException::CryptoProviderError,
"Error requesting HMAC object from Crypto Provider");
}
mp_h->setKey(key);
}
md_value = new unsigned char[XSECPlatformUtils::g_cryptoProvider->getMaxHashSize()];
if (!md_value) {
delete mp_h;
}
};
TXFMHash::~TXFMHash() {
// Clean up
if (mp_h)
delete mp_h;
if (md_value)
delete[] md_value;
};
// Methods to set the inputs
//void TXFMHash::setInput(TXFMBase *input);
// Methods to get tranform output type and input requirement
TXFMBase::ioType TXFMHash::getInputType() const {
return TXFMBase::BYTE_STREAM;
}
TXFMBase::ioType TXFMHash::getOutputType() const {
return TXFMBase::BYTE_STREAM;
}
TXFMBase::nodeType TXFMHash::getNodeType() const {
return TXFMBase::DOM_NODE_NONE;
}
// Methods to set input data
void TXFMHash::setInput(TXFMBase* inputT) {
input = inputT;
keepComments = input->getCommentsStatus();
// Now run through the data
unsigned char buffer[1024];
unsigned int size;
while ((size = input->readBytes((XMLByte *) buffer, 1024)) != 0) {
mp_h->hash(buffer, size);
}
// Finalise
md_len = mp_h->finish(md_value, XSECPlatformUtils::g_cryptoProvider->getMaxHashSize());
toOutput = md_len;
}
unsigned int TXFMHash::readBytes(XMLByte * const toFill, unsigned int maxToFill) {
unsigned int ret;
if (toOutput == 0)
return 0;
// Check if we can just output everything left
if (toOutput <= maxToFill) {
memcpy((char *) toFill, &md_value[md_len - toOutput], toOutput);
ret = toOutput;
toOutput = 0;
return ret;
}
// Output just some
memcpy((char *) toFill, &md_value[md_len - toOutput], maxToFill);
ret = maxToFill;
toOutput -= maxToFill;
return ret;
}
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