Java by API/java.security.spec/ECPoint

new ECPoint(BigInteger x, BigInteger y)

   <source lang="java">
 

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())));
 }

}

 </source>