KeyPairGenerator genKeyPair() method in Java with Examples
The genKeyPair() method of java.security.KeyPairGenerator class is used to generate a key pair.
If this KeyPairGenerator has not been initialized explicitly, provider-specific defaults will be used for the size and other (algorithm-specific) values of the generated keys.
This will generate a new key pair every time it is called.
Syntax:
public final KeyPair genKeyPair()
Return Value: This method returns the generated key pair
Below are the examples to illustrate the genKeyPair() method
Note: These programs wont run in online IDE.
Example 1: With initialization
Java
// Java program to demonstrate // genKeyPair() method import java.security.*; import java.util.*; public class GFG1 { public static void main(String[] argv) throws Exception { try { // creating the object of KeyPairGenerator KeyPairGenerator kpg = KeyPairGenerator .getInstance( "RSA" ); // initializing with 1024 kpg.initialize( 1024 ); // getting key pairs // using genKeyPair() method KeyPair kp = kpg.genKeyPair(); // printing the Keypair System.out.println( "Keypair : " + kp); } catch (NoSuchAlgorithmException e) { System.out.println( "Exception thrown : " + e); } } } |
Output:
Keypair : java.security.KeyPair@12a3a380
Example 2: Without Initialization
Java
// Java program to demonstrate // genKeyPair() method import java.security.*; import java.util.*; public class GFG1 { public static void main(String[] argv) throws Exception { try { // creating the object of KeyPairGenerator KeyPairGenerator kpg = KeyPairGenerator .getInstance( "RSA" ); // getting key pairs // using genKeyPair() method KeyPair kp = kpg.genKeyPair(); // printing the number of byte System.out.println( "Keypair : " + kp); } catch (NoSuchAlgorithmException e) { System.out.println( "Exception thrown : " + e); } } } |
Output:
Keypair : java.security.KeyPair@12a3a380