ecdh/examples/ecdh.js

Native node.js module for ECDH and ECDSA

var ecdh = require("../index");

// Pick some curve
var curve = ecdh.getCurve("secp128r1"),
  // Generate random keys for Alice and Bob
  aliceKeys = ecdh.generateKeys(curve),
  bobKeys = ecdh.generateKeys(curve);

// Or you may get the keys from buffers:
//	aliceKeys = {
//		publicKey: ecdh.PublicKey.fromBuffer(curve, buf1),
//		privateKey: ecdh.PrivateKey.fromBuffer(curve, buf2)
//	};

console.log("Alice public key:", aliceKeys.publicKey.buffer.toString("hex"));
console.log("Alice private key:", aliceKeys.privateKey.buffer.toString("hex"));
console.log("Bob public key:", bobKeys.publicKey.buffer.toString("hex"));
console.log("Bob private key:", bobKeys.privateKey.buffer.toString("hex"));

// Alice generate the shared secret:
var aliceSharedSecret = aliceKeys.privateKey.deriveSharedSecret(
  bobKeys.publicKey
);
console.log("shared secret:", aliceSharedSecret.toString("hex"));

// Checking that Bob has the same secret:
var bobSharedSecret = bobKeys.privateKey.deriveSharedSecret(
    aliceKeys.publicKey
  ),
  equals =
    bobSharedSecret.toString("hex") === aliceSharedSecret.toString("hex");
console.log("Shared secrets are", equals ? "equal :)" : "not equal!!");