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import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Signature;
public class SignatureTest {
public static void main(String[] args) {
try {
KeyPairGenerator keygen = KeyPairGenerator.getInstance("DSA");
SecureRandom secrand = new SecureRandom();
keygen.initialize(512, secrand);
KeyPair keys1 = keygen.generateKeyPair();
PublicKey pubkey1 = keys1.getPublic();
PrivateKey privkey1 = keys1.getPrivate();
KeyPair keys2 = keygen.generateKeyPair();
PublicKey pubkey2 = keys2.getPublic();
PrivateKey privkey2 = keys2.getPrivate();
Signature signalg = Signature.getInstance("DSA");
signalg.initSign(privkey1);
String message = "Pay authors a bonus of $20,000.";
signalg.update(message.getBytes());
byte[] signature = signalg.sign();
Signature verifyalg = Signature.getInstance("DSA");
verifyalg.initVerify(pubkey1);
verifyalg.update(message.getBytes());
if (!verifyalg.verify(signature))
System.out.print("not ");
System.out.println("signed with private key 1");
verifyalg.initVerify(pubkey2);
verifyalg.update(message.getBytes());
if (!verifyalg.verify(signature))
System.out.print("not ");
System.out.println("signed with private key 2");
} catch (Exception e) {
System.out.println("Error " + e);
}
}
}
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