BGN2/bgn2/inc/PublicKey.hpp

#ifndef __PUBLICKEY_HPP
#define __PUBLICKEY_HPP

#include "Scalar.hpp"
#include "Bipoint.hpp"
#include "Quadripoint.hpp"
#include "pairing.hpp"

class PublicKey
{
	public:
		void encrypt(Bipoint<curvepoint_fp_t>& G_element, const Scalar& cleartext) const;
		void encrypt(Bipoint<twistpoint_fp2_t>& H_element, const Scalar& cleartext) const;
		void encrypt(Bipoint<curvepoint_fp_t>& G_element, Bipoint<twistpoint_fp2_t>& H_element, const Scalar& cleartext) const;

		Bipoint<curvepoint_fp_t> homomorphic_addition(const Bipoint<curvepoint_fp_t>& a, const Bipoint<curvepoint_fp_t>& b) const;
		Bipoint<twistpoint_fp2_t> homomorphic_addition(const Bipoint<twistpoint_fp2_t>& a, const Bipoint<twistpoint_fp2_t>& b) const;
		Quadripoint homomorphic_addition(const Quadripoint& a, const Quadripoint& b) const;
		Quadripoint homomorphic_multiplication(const Bipoint<curvepoint_fp_t>& a, const Bipoint<twistpoint_fp2_t>& b) const;
		
		Bipoint<curvepoint_fp_t> get_bipoint_curvegen() const;
		Bipoint<twistpoint_fp2_t> get_bipoint_twistgen() const;	
		Bipoint<curvepoint_fp_t> get_bipoint_curve_subgroup_gen() const;
		Bipoint<twistpoint_fp2_t> get_bipoint_twist_subgroup_gen() const;	
		
	private:
		PublicKey();
		void set(const Bipoint<curvepoint_fp_t>& g, const Bipoint<twistpoint_fp2_t>& h, const Bipoint<curvepoint_fp_t>& g1, const Bipoint<twistpoint_fp2_t>& h1);
		friend class BGN;

		Bipoint<curvepoint_fp_t> bipoint_curvegen; // g
		Bipoint<twistpoint_fp2_t> bipoint_twistgen; // h
		Bipoint<curvepoint_fp_t> bipoint_curve_subgroup_gen; // (g^(a1), g^(b1))
		Bipoint<twistpoint_fp2_t> bipoint_twist_subgroup_gen; // (h^(a2), h^(b2))
};

#endif