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#ifndef INCLUDED_DECRYPTBUF_
#define INCLUDED_DECRYPTBUF_

#include <iosfwd>
#include <streambuf>
#include <openssl/ossl_typ.h>

namespace FBB
{

struct DecryptBufImp;

class DecryptBuf: public std::streambuf
{
    DecryptBufImp *d_pimpl;
    static bool s_completed;

    public:
        DecryptBuf(std::ostream &outStream, char const *type, 
                            std::string key, std::string iv,
                            size_t bufsize = 1024);
        virtual ~DecryptBuf();

        void setIv(std::string iv);
        bool setRounds(size_t nRounds);             // RC5 8, 12 or 16

        void done();
        static bool lastOK();                       // .f

    protected:
        EVP_CIPHER_CTX *cipherCtx();

    private:
        void update();
        void open();
        void installKey(std::string const &key, size_t length);
        virtual int overflow(int c);
};

inline bool DecryptBuf::lastOK()
{
    return s_completed;
}

}   // FBB
        
#endif