The generateKeyPair() method of java.security.KeyPairGenerator class is used to Generates 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 KeyPair generateKeyPair()
Return Value: This method returns the generated key pair.
Below are the examples to illustrate the generateKeyPair() method
Note: The following program will not run on online IDE.
Example 1: With initialization
Java
// Java program to demonstrate// generateKeyPair() methodimport 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 generateKeyPair() method KeyPair kp = kpg.generateKeyPair(); // 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
Example 2: Without Initialization
Java
// Java program to demonstrate// generateKeyPair() methodimport 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 generateKeyPair() method KeyPair kp = kpg.generateKeyPair(); // 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
