project-code

Elliptic curve time codeexecution

package encryptionalgorithms;

import gui.DisplayTextPanel;

import java.math.BigInteger; import java.security.; import java.security.spec.;

import javax.crypto.KeyAgreement;

public class ECDH { KeyPairGenerator keyPairGenerator; DisplayTextPanel display; String ecCurve;

public ECDH(DisplayTextPanel display) {
	this.display = display;
}

public void setEcCurve(String ecCurve) {
	this.ecCurve = ecCurve;
}

public void generateKeys() {

	long startTime = System.currentTimeMillis();
	if (ecCurve == null)
		display.addText("Please  select a key size in the File menu.....");
	else {
		try {
			keyPairGenerator = KeyPairGenerator.getInstance("EC", "SunEC");
			ECGenParameterSpec ecsp;
			display.addText("ECDH Key Exchange scheme.....\n");
			ecsp = new ECGenParameterSpec(ecCurve);
			keyPairGenerator.initialize(ecsp);

			KeyPair keyPairAlice = keyPairGenerator.genKeyPair();
			PrivateKey privKeyAlice = keyPairAlice.getPrivate();
			PublicKey pubKeyAlice = keyPairAlice.getPublic();
			display.addText("Alice: " + privKeyAlice.toString());
			display.addText("Alice: " + pubKeyAlice.toString());

			KeyPair keyPairBob = keyPairGenerator.genKeyPair();
			PrivateKey privKeyBob = keyPairBob.getPrivate();
			PublicKey pubKeyBob = keyPairBob.getPublic();
			display.addText("\nBob: " + privKeyBob.toString());
			display.addText("Bob: " + pubKeyBob.toString());

			KeyAgreement ecdhAlice = KeyAgreement.getInstance("ECDH");
			ecdhAlice.init(privKeyAlice);
			ecdhAlice.doPhase(pubKeyBob, true);

			KeyAgreement ecdhBob = KeyAgreement.getInstance("ECDH");
			ecdhBob.init(privKeyBob);
			ecdhBob.doPhase(pubKeyAlice, true);

			display.addText("\nSecret computed by Alice: 0x"
					+ (new BigInteger(1, ecdhAlice.generateSecret())
							.toString(16)).toUpperCase());
			display.addText("\nSecret computed by Bob: 0x"
					+ (new BigInteger(1, ecdhBob.generateSecret())
							.toString(16)).toUpperCase());
			long endTime = System.currentTimeMillis();
			display.addText("\n Time to generate keys:"
					+ (endTime - startTime) + " Milli Seconds\n");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

}