KeyPairGenerator generateKeyPair() method in Java with Examples
Last Updated :
06 Jun, 2021
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
import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
try {
KeyPairGenerator kpg = KeyPairGenerator
.getInstance( "RSA" );
kpg.initialize( 1024 );
KeyPair kp = kpg.generateKeyPair();
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
import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
try {
KeyPairGenerator kpg = KeyPairGenerator.getInstance( "RSA" );
KeyPair kp = kpg.generateKeyPair();
System.out.println( "Keypair : " + kp);
}
catch (NoSuchAlgorithmException e) {
System.out.println( "Exception thrown : " + e);
}
}
}
|
Output:
Keypair : java.security.KeyPair@12a3a380
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