Generate key from bouncy castle for ECDH - Java Security

Java examples for Security:Key

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Description

Generate key from bouncy castle for ECDH

Demo Code

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Arrays;
import java.util.Date;
import java.sql.Timestamp;

import javax.crypto.KeyAgreement;

import org.bouncycastle.jce.ECNamedCurveTable;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.spec.ECParameterSpec;

public class trial {

    public static void GetTimestamp(String info) {
        System.out.println(info + new Timestamp((new Date()).getTime()));
    }//  ww  w .  ja va  2s  .  com

    public static boolean GenerateAgreement()
            throws NoSuchAlgorithmException, NoSuchProviderException,
            InvalidAlgorithmParameterException, InvalidKeyException {
        ECParameterSpec ecSpec = ECNamedCurveTable
                .getParameterSpec("B-571");

        KeyPairGenerator g = KeyPairGenerator.getInstance("ECDH", "BC");

        g.initialize(ecSpec, new SecureRandom());

        KeyPair aKeyPair = g.generateKeyPair();

        KeyAgreement aKeyAgree = KeyAgreement.getInstance("ECDH", "BC");

        aKeyAgree.init(aKeyPair.getPrivate());

        KeyPair bKeyPair = g.generateKeyPair();

        KeyAgreement bKeyAgree = KeyAgreement.getInstance("ECDH", "BC");

        bKeyAgree.init(bKeyPair.getPrivate());

        aKeyAgree.doPhase(bKeyPair.getPublic(), true);
        bKeyAgree.doPhase(aKeyPair.getPublic(), true);

        byte[] aSecret = aKeyAgree.generateSecret();
        byte[] bSecret = bKeyAgree.generateSecret();

        System.out.println(Arrays.toString(aSecret));
        System.out.println(Arrays.toString(bSecret));

        return MessageDigest.isEqual(aSecret, bSecret);
    }

    public static void main(String[] args) throws Exception {

        Security.addProvider(new BouncyCastleProvider());

        GetTimestamp("Key Generation started: ");
        System.out.println(GenerateAgreement());
        System.out.println(keys.getPublic().toString());
        System.out.println(keys.getPrivate().toString());
        GetTimestamp("Key Generation ended: ");

    }

}

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