VirgilOperationDH.h

#ifndef VIRGIL_CRYPTO_VIRGIL_DH_H
#define VIRGIL_CRYPTO_VIRGIL_DH_H

#include "../VirgilByteArray.h"

#include <memory>

namespace virgil { namespace crypto { inline namespace primitive {

class VirgilOperationDH {
private:
    template<class Impl>
    struct Model;

public:
    template<class Impl>
    VirgilOperationDH(Impl impl) : self_(std::make_shared<Model<Impl>>(std::move(impl))) {}

    VirgilByteArray calculate(
            const VirgilByteArray& publicKey, const VirgilByteArray& privateKey,
            const VirgilByteArray& privateKeyPassword = VirgilByteArray()) const {
        return self_->doCalculate(publicKey, privateKey, privateKeyPassword);
    }

    static VirgilOperationDH getDefault();

private:
    struct Concept {

        virtual VirgilByteArray doCalculate(
                const VirgilByteArray& publicKey, const VirgilByteArray& privateKey,
                const VirgilByteArray& privateKeyPassword) const = 0;

        virtual ~Concept() noexcept = default;
    };

    template<class Impl>
    struct Model : Concept {

        explicit Model(Impl impl) : impl_(std::move(impl)) {}

        VirgilByteArray doCalculate(
                const VirgilByteArray& publicKey, const VirgilByteArray& privateKey,
                const VirgilByteArray& privateKeyPassword) const override {

            return impl_.calculate(publicKey, privateKey, privateKeyPassword);
        }

    private:
        Impl impl_;
    };

private:
    std::shared_ptr<const Concept> self_;
};

}}}

#endif //VIRGIL_CRYPTO_VIRGIL_DH_H