add bls mcl libs

bls/lib/mcl/ffi/java/elgamal_impl.hpp

@@ -0,0 +1,147 @@
+#pragma once
+//#define MCL_MAX_BIT_SIZE 521
+#include <iostream>
+#include <fstream>
+#include <cybozu/random_generator.hpp>
+#include <cybozu/crypto.hpp>
+#include <mcl/fp.hpp>
+#include <mcl/ecparam.hpp>
+#include <mcl/elgamal.hpp>
+
+typedef mcl::FpT<mcl::FpTag, 521> Fp;
+typedef mcl::FpT<mcl::ZnTag, 521> Zn;
+typedef mcl::EcT<Fp> Ec;
+typedef mcl::ElgamalT<Ec, Zn> Elgamal;
+
+/*
+	init system
+	@param param [in] string such as "ecParamName hashName"
+	@note NOT thread safe because setting global parameters of elliptic curve
+	ex1) "secp192k1 sha256" // 192bit security + sha256
+	ex2) "secp160k1 sha1" // 160bit security + sha1
+	hashName : sha1 sha224 sha256 sha384 sha512
+*/
+void SystemInit(const std::string& param) throw(std::exception)
+{
+	std::istringstream iss(param);
+	std::string ecParamStr;
+	std::string hashNameStr;
+	if (iss >> ecParamStr >> hashNameStr) {
+		Param& p = Param::getParam();
+		p.ecParam = mcl::getEcParam(ecParamStr);
+		Zn::init(p.ecParam->n);
+		Fp::init(p.ecParam->p);
+		Ec::init(p.ecParam->a, p.ecParam->b);
+		p.hashName = cybozu::crypto::Hash::getName(hashNameStr);
+		return;
+	}
+	throw cybozu::Exception("SystemInit:bad param") << param;
+}
+
+class CipherText {
+	Elgamal::CipherText self_;
+	friend class PublicKey;
+	friend class PrivateKey;
+public:
+	std::string toStr() const throw(std::exception) { return self_.toStr(); }
+	std::string toString() const throw(std::exception) { return toStr(); }
+	void fromStr(const std::string& str) throw(std::exception) { self_.fromStr(str); }
+
+	void add(const CipherText& c) throw(std::exception) { self_.add(c.self_); }
+	void mul(int m) throw(std::exception)
+	{
+		self_.mul(m);
+	}
+	void mul(const std::string& str) throw(std::exception)
+	{
+		Zn zn(str);
+		self_.mul(zn);
+	}
+};
+
+class PublicKey {
+	Elgamal::PublicKey self_;
+	friend class PrivateKey;
+public:
+	std::string toStr() const throw(std::exception) { return self_.toStr(); }
+	std::string toString() const throw(std::exception) { return toStr(); }
+	void fromStr(const std::string& str) throw(std::exception) { self_.fromStr(str); }
+
+	void save(const std::string& fileName) const throw(std::exception)
+	{
+		std::ofstream ofs(fileName.c_str(), std::ios::binary);
+		if (!(ofs << self_)) throw cybozu::Exception("PublicKey:save") << fileName;
+	}
+	void load(const std::string& fileName) throw(std::exception)
+	{
+		std::ifstream ifs(fileName.c_str(), std::ios::binary);
+		if (!(ifs >> self_)) throw cybozu::Exception("PublicKey:load") << fileName;
+	}
+	void enc(CipherText& c, int m) const throw(std::exception)
+	{
+		self_.enc(c.self_, m, Param::getParam().rg);
+	}
+	void enc(CipherText& c, const std::string& str) const throw(std::exception)
+	{
+		Zn zn(str);
+		self_.enc(c.self_, zn, Param::getParam().rg);
+	}
+	void rerandomize(CipherText& c) const throw(std::exception)
+	{
+		self_.rerandomize(c.self_, Param::getParam().rg);
+	}
+	void add(CipherText& c, int m) const throw(std::exception)
+	{
+		self_.add(c.self_, m);
+	}
+	void add(CipherText& c, const std::string& str) const throw(std::exception)
+	{
+		Zn zn(str);
+		self_.add(c.self_, zn);
+	}
+};
+
+class PrivateKey {
+	Elgamal::PrivateKey self_;
+public:
+	std::string toStr() const throw(std::exception) { return self_.toStr(); }
+	std::string toString() const throw(std::exception) { return toStr(); }
+	void fromStr(const std::string& str) throw(std::exception) { self_.fromStr(str); }
+
+	void save(const std::string& fileName) const throw(std::exception)
+	{
+		std::ofstream ofs(fileName.c_str(), std::ios::binary);
+		if (!(ofs << self_)) throw cybozu::Exception("PrivateKey:save") << fileName;
+	}
+	void load(const std::string& fileName) throw(std::exception)
+	{
+		std::ifstream ifs(fileName.c_str(), std::ios::binary);
+		if (!(ifs >> self_)) throw cybozu::Exception("PrivateKey:load") << fileName;
+	}
+	void init() throw(std::exception)
+	{
+		Param& p = Param::getParam();
+		const Fp x0(p.ecParam->gx);
+		const Fp y0(p.ecParam->gy);
+		Ec P(x0, y0);
+		self_.init(P, Zn::getBitSize(), p.rg);
+	}
+	PublicKey getPublicKey() const throw(std::exception)
+	{
+		PublicKey ret;
+		ret.self_ = self_.getPublicKey();
+		return ret;
+	}
+	int dec(const CipherText& c, bool *b = 0) const throw(std::exception)
+	{
+		return self_.dec(c.self_, b);
+	}
+	void setCache(int rangeMin, int rangeMax) throw(std::exception)
+	{
+		self_.setCache(rangeMin, rangeMax);
+	}
+	void clearCache() throw(std::exception)
+	{
+		self_.clearCache();
+	}
+};