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Java Signature initSign() method with Examples
The initSign() method initialize this object for signing. If this method is called again with a different argument, it negates the effect of this call.
Let us now see an example −
Example
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.Signature;
import java.util.Scanner;
public class Main {
public static void main(String args[]) throws Exception {
//Creating KeyPair generator object
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("DSA");
//Initializing the key pair generator
keyPairGen.initialize(2048);
//Generate the pair of keys
KeyPair pair = keyPairGen.generateKeyPair();
//Getting the privatekey from the key pair
PrivateKey privKey = pair.getPrivate();
//Creating a Signature object
Signature sign = Signature.getInstance("SHA256withDSA");
//Initializing the signature
sign.initSign(privKey);
byte[] bytes = "Hello how are you".getBytes();
//Adding data to the signature
sign.update(bytes);
//Calculating the signature
byte[] signature = sign.sign();
//Initializing the signature
sign.initVerify(pair.getPublic());
sign.update(bytes);
//Verifying the signature
boolean bool = sign.verify(signature);
if(bool) {
System.out.println("Signature verified");
} else {
System.out.println("Signature failed");
}
}
}Output
Signature verified
Updated on: 23-Sep-2019
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