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import java.math.BigInteger;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.security.Security;
import java.security.spec.ECFieldFp;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.EllipticCurve;
import javax.crypto.KeyAgreement;
public class MainClass {
public static void main(String[] args) throws Exception {
// Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ECDH", "BC");
EllipticCurve curve = new EllipticCurve(new ECFieldFp(new BigInteger(
"fffffffffffffffffffffffffffffffeffffffffffffffff", 16)), new BigInteger(
"fffffffffffffffffffffffffffffffefffffffffffffffc", 16), new BigInteger(
"fffffffffffffffffffffffffffffffefffffffffffffffc", 16));
ECParameterSpec ecSpec = new ECParameterSpec(curve, new ECPoint(new BigInteger(
"fffffffffffffffffffffffffffffffefffffffffffffffc", 16), new BigInteger(
"fffffffffffffffffffffffffffffffefffffffffffffffc", 16)), new BigInteger(
"fffffffffffffffffffffffffffffffefffffffffffffffc", 16), 1);
keyGen.initialize(ecSpec, new SecureRandom());
KeyAgreement aKeyAgree = KeyAgreement.getInstance("ECDH", "BC");
KeyPair aPair = keyGen.generateKeyPair();
KeyAgreement bKeyAgree = KeyAgreement.getInstance("ECDH", "BC");
KeyPair bPair = keyGen.generateKeyPair();
aKeyAgree.init(aPair.getPrivate());
bKeyAgree.init(bPair.getPrivate());
aKeyAgree.doPhase(bPair.getPublic(), true);
bKeyAgree.doPhase(aPair.getPublic(), true);
MessageDigest hash = MessageDigest.getInstance("SHA1", "BC");
System.out.println(new String(hash.digest(aKeyAgree.generateSecret())));
System.out.println(new String(hash.digest(bKeyAgree.generateSecret())));
}
}
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