HMacStream.cpp

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/*
 * HMacStream.cpp
 *
 * Copyright (C) 2011 IBR, TU Braunschweig
 *
 * Written-by: Johannes Morgenroth <morgenroth@ibr.cs.tu-bs.de>
 *
 * Licensed 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.
 *
 */

#include "ibrcommon/ssl/HMacStream.h"

namespace ibrcommon
{
        HMacStream::HMacStream(const unsigned char * const key, const int key_size)
         : HashStream(BUFF_SIZE, EVP_MAX_MD_SIZE), key_(key), key_size_(key_size)
        {
                HMAC_CTX_init(&ctx_);
                HMAC_Init_ex(&ctx_, key_, key_size_, EVP_sha1(), NULL);
        }

        HMacStream::~HMacStream()
        {
                HMAC_CTX_cleanup(&ctx_);
        }

        void HMacStream::update(char *buf, const size_t size)
        {
                // hashing
                HMAC_Update(&ctx_, (unsigned char*)buf, size);
        }

        void HMacStream::finalize(char * hash, unsigned int &size)
        {
                HMAC_Final(&ctx_, (unsigned char*)hash, &size);
        }
}