RSASHA256Stream.h

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/*
 * RSASHA256Stream.h
 *
 * 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.
 *
 */

#ifndef RSASHA256STREAM_H_
#define RSASHA256STREAM_H_

#include "ibrcommon/Exceptions.h"
#include <openssl/evp.h>
#include <streambuf>
#include <iostream>
#include <vector>

namespace ibrcommon
{
        class RSASHA256Stream : public std::basic_streambuf<char, std::char_traits<char> >, public std::ostream
        {
        public:
                typedef std::char_traits<char> traits;

                static const size_t BUFF_SIZE = 2048;

                RSASHA256Stream(EVP_PKEY * const pkey, bool verfiy = false);

                virtual ~RSASHA256Stream();

                void reset();

                const std::pair<const int, const std::string> getSign();

                int getVerification(const std::string& their_sign);

        protected:
                virtual int sync();

                virtual traits::int_type overflow(traits::int_type = traits::eof());

        private:
                std::vector<char> out_buf_;

                EVP_PKEY * const _pkey;

                const bool _verify;

                EVP_MD_CTX _ctx;

                bool _sign_valid;
                int _return_code;
                std::string _sign;
        };
}
#endif /* RSASHA256STREAM_H_ */