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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.Security;
import java.security.Signature;
public class MainClass {
public static void main(String args[]) throws Exception {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
KeyPair keyPair = generateKeyPair(999);
byte[] data = { 65, 66, 67, 68, 69, 70, 71, 72, 73, 74 };
byte[] digitalSignature = signData(data, keyPair.getPrivate());
boolean verified;
verified = verifySig(data, keyPair.getPublic(), digitalSignature);
System.out.println(verified) ;
keyPair = generateKeyPair(888);
verified = verifySig(data, keyPair.getPublic(), digitalSignature);
System.out.println(verified);
}
public static byte[] signData(byte[] data, PrivateKey key) throws Exception {
Signature signer = Signature.getInstance("SHA1withDSA");
signer.initSign(key);
signer.update(data);
return (signer.sign());
}
public static boolean verifySig(byte[] data, PublicKey key, byte[] sig) throws Exception {
Signature signer = Signature.getInstance("SHA1withDSA");
signer.initVerify(key);
signer.update(data);
return (signer.verify(sig));
}
public static KeyPair generateKeyPair(long seed) throws Exception {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
KeyPairGenerator keyGenerator = KeyPairGenerator.getInstance("DSA");
SecureRandom rng = SecureRandom.getInstance("SHA1PRNG", "SUN");
rng.setSeed(seed);
keyGenerator.initialize(1024, rng);
return (keyGenerator.generateKeyPair());
}
}
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SignatureSignAndVerify.zip( 1,198 k)