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#ifndef INCLUDED_BOBCAT_DIFFIEHELLMAN_
#define INCLUDED_BOBCAT_DIFFIEHELLMAN_

#include <memory>
#include <iosfwd>

#include <bobcat/bigint>
#include <openssl/dh.h>

namespace FBB
{

class DiffieHellman
{
    std::shared_ptr<DH> d_dh;
    std::shared_ptr<BIGNUM> d_otherPubKey;  // public key of the other party

    static char const *s_header;

    public:
        enum SecretKey
        {
            DONT_SAVE_SECRET_KEY,
            SAVE_SECRET_KEY
        };

        enum
        {
            CHECK_FAILS = 
                ~(DH_CHECK_P_NOT_PRIME | DH_CHECK_P_NOT_SAFE_PRIME | 
                  DH_NOT_SUITABLE_GENERATOR | DH_UNABLE_TO_CHECK_GENERATOR)
        };

            // The initiator calls this constructor, which computes the common
            // DH parameters
        DiffieHellman(size_t primeLength = 1024, size_t generator = 5,
                      bool progress = false);

            // The initiator saves the public info on basename.pub
            // and, by providing 'SAVE_SECRET_KEY, the secret info on
            // basename.sec 
        void save(std::string const &basename, SecretKey action = 
                                                DONT_SAVE_SECRET_KEY) const;

            // The initiator sends basename.pub to the peer, who reads
            // basename.pub using this constructor:
        DiffieHellman(std::string const &initiatorPublicFileName);
            // Alternatively, use this constructor expecting an istream:
        DiffieHellman(std::istream &initiatorPublicStream);

            // The peer now saves *his/her* public and (optionally) private
            // info: by calling save, providing a basename and optionally a
            // SecretKey argument.  Next, the peer sends his/her public info
            // to the initiator. 

            // The peer can already now determine the symmetric encryption
            // key, since he/she has 
            //  - The DH prime and generator;
            //  - The initiator's public key;
            //  - His/her own secret key.
            // The key is obtained by calling
        std::string key() const;

            // The initiator has two options: - After calling save and
            // transmitting the public data to the peer the DiffieHellman
            // object is kept, and the initiator waits for the peer's public
            // key to become available. In that case the initiator's private
            // key doesn't have to be saved, and ephemeral DH is
            // obtained. After receiving the peer's public parameters the
            // initiator calls either of these overloaded versions of key to
            // obtain the symmetric key:
        std::string key(std::string const &peerPublicFileName);
        std::string key(std::istream &peerPublicStream);

            // Otherwise the initiator creates another DiffieHellman object, 
            // using the 4th or 5th constructor, and then calls either of the
            // last two key members to obtain the symmetric key.

        DiffieHellman(std::string const &initiatorPublicFileName,
                      std::string const &initiatorPrivateFileName);
            // Alternatively, use this constructor expecting istreams:
        DiffieHellman(std::istream &initiatorPublicStream,
                      std::istream &initiatorPrivateStream);


    private:
        void checkDHparameters();
        bool load(std::istream &publicData);
        void write(std::ostream &out, BIGNUM const *bn, char *buffer, 
                                                    uint32_t nBytes) const;

        bool read(std::istream &in, BIGNUM **dest);

        static void skip(std::istream &in, size_t count);
        static void callback(int, int, void *);

//        std::string publicKey() const;
//        std::string sharedKey(BigInt const &peersPublicKey
//    private:
//
//        DH *newDH();
};
} // FBB        
#endif