/**
 * 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
 *
 * TXFMSHA1 := Class that performs a hash or HMAC transform
 *
 * $Id: TXFMSHA1.hpp 1817135 2017-12-04 22:24:05Z scantor $
 *
 */

// XSEC Includes

#include <xsec/transformers/TXFMBase.hpp>
#include <xsec/enc/XSECCryptoProvider.hpp>

/**
 * \brief Transformer to handle create a hash or HMAC from a chain
 * @ingroup internal
 */

class XSEC_EXPORT TXFMHash : public TXFMBase {

private:
    XSECCryptoHash* mp_h; 		// To hold the hash
    unsigned char* md_value;    // Final output
    unsigned int md_len;        // Length of digest

    unsigned int toOutput;      // Amount still to output

public:
    TXFMHash(XERCES_CPP_NAMESPACE_QUALIFIER DOMDocument *doc, XSECCryptoHash::HashType type, const XSECCryptoKey * key = NULL);
    virtual ~TXFMHash();

    // Methods to get tranform output type and input requirement

    virtual TXFMBase::ioType getInputType() const;
    virtual TXFMBase::ioType getOutputType() const;
    virtual nodeType getNodeType() const;

    // Methods to set input data

    virtual void setInput(TXFMBase * inputT);

    // Methods to get output data

    virtual unsigned int readBytes(XMLByte * const toFill, const unsigned int maxToFill);
};