ibrcommon/ibrcommon/ssl/RSASHA256Stream.h

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#ifndef RSASHA256STREAM_H_
#define RSASHA256STREAM_H_

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

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:
                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_ */