1 files changed, 64 insertions, 0 deletions
diff --git a/vendor/github.com/byzantine-lab/mcl/sample/ecdh.cpp b/vendor/github.com/byzantine-lab/mcl/sample/ecdh.cpp
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index 000000000..d5c4a31b2
--- /dev/null
+++ b/vendor/github.com/byzantine-lab/mcl/sample/ecdh.cpp
@@ -0,0 +1,64 @@
+/*
+	sample of Elliptic Curve Diffie-Hellman key sharing
+*/
+#include <iostream>
+#include <fstream>
+#include <cybozu/random_generator.hpp>
+#include <mcl/fp.hpp>
+#include <mcl/ecparam.hpp>
+
+typedef mcl::FpT<> Fp;
+typedef mcl::FpT<mcl::ZnTag> Zn;
+typedef mcl::EcT<Fp> Ec;
+
+int main()
+{
+	cybozu::RandomGenerator rg;
+	/*
+		system setup with a parameter secp192k1 recommended by SECG
+		Ec is an elliptic curve over Fp
+		the cyclic group of <P> is isomorphic to Zn
+	*/
+	const mcl::EcParam& para = mcl::ecparam::secp192k1;
+	Zn::init(para.n);
+	Fp::init(para.p);
+	Ec::init(para.a, para.b);
+	const Ec P(Fp(para.gx), Fp(para.gy));
+
+	/*
+		Alice setups a private key a and public key aP
+	*/
+	Zn a;
+	Ec aP;
+
+	a.setRand(rg);
+	Ec::mul(aP, P, a); // aP = a * P;
+
+	std::cout << "aP=" << aP << std::endl;
+
+	/*
+		Bob setups a private key b and public key bP
+	*/
+	Zn b;
+	Ec bP;
+
+	b.setRand(rg);
+	Ec::mul(bP, P, b); // bP = b * P;
+
+	std::cout << "bP=" << bP << std::endl;
+
+	Ec abP, baP;
+
+	// Alice uses bP(B's public key) and a(A's priavte key)
+	Ec::mul(abP, bP, a); // abP = a * (bP)
+
+	// Bob uses aP(A's public key) and b(B's private key)
+	Ec::mul(baP, aP, b); // baP = b * (aP)
+
+	if (abP == baP) {
+		std::cout << "key sharing succeed:" << abP << std::endl;
+	} else {
+		std::cout << "ERR(not here)" << std::endl;
+	}
+}
+