/*
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/*
 * XSEC
 *
 * TXFMSHA1 := Class that performs a SHA1 transform
 *
 * Author(s): Berin Lautenbach
 *
 * $Id: TXFMSHA1.cpp,v 1.3 2003/02/21 11:53:08 blautenb Exp $
 *
 */

// XSEC

#include <xsec/transformers/TXFMSHA1.hpp>
#include <xsec/utils/XSECPlatformUtils.hpp>
#include <xsec/framework/XSECException.hpp>

// Standarad includes 

TXFMSHA1::TXFMSHA1(DOMDocument *doc,
									 XSECCryptoKey * key) : TXFMBase (doc) {

	toOutput = 0;					// Nothing yet to output

	if (key == NULL)
		// Get a SHA1 worker
		mp_h = XSECPlatformUtils::g_cryptoProvider->hashSHA1();
	else {
		// Get an HMAC Sha1
		
		mp_h = XSECPlatformUtils::g_cryptoProvider->hashHMACSHA1();
		mp_h->setKey(key);

	}

	
	if (!mp_h) {

		throw XSECException(XSECException::CryptoProviderError, 
				"Error requesting SHA1 object from Crypto Provider");

	}
									
};

TXFMSHA1::~TXFMSHA1() {

	// Clean up
	if (mp_h)
		delete mp_h;

};

	// Methods to set the inputs

//void TXFMSHA1::setInput(TXFMBase *input);

	// Methods to get tranform output type and input requirement

TXFMBase::ioType TXFMSHA1::getInputType(void) {

	return TXFMBase::BYTE_STREAM;

}
TXFMBase::ioType TXFMSHA1::getOutputType(void) {

	return TXFMBase::BYTE_STREAM;

}


TXFMBase::nodeType TXFMSHA1::getNodeType(void) {

	return TXFMBase::DOM_NODE_NONE;

}

	// Methods to set input data

void TXFMSHA1::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, CRYPTO_MAX_HASH_SIZE);

	toOutput = md_len;

}


unsigned int TXFMSHA1::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;

}

DOMDocument * TXFMSHA1::getDocument() {

	return NULL;

}

DOMNode * TXFMSHA1::getFragmentNode() {

	return NULL;		// Return a null node

};

const XMLCh * TXFMSHA1::getFragmentId() {

	return NULL;	// Empty string

}