Java Key Pair Create generateKeyPair()

Description

generate Key Pair

License

Apache License

Declaration

public static void generateKeyPair() 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;

import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;

public class Main {
    public static void generateKeyPair() {
        try {/*ww  w  . j av a 2 s  .  co m*/
            KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");

            SecureRandom random = new SecureRandom();
            random.setSeed(System.currentTimeMillis());
            generator.initialize(1024, random);
            KeyPair keyPair = generator.generateKeyPair();
            RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
            RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();

            //            System.out.println(publicKey.getModulus());
            //            System.out.println(publicKey.getPublicExponent());
            //            System.out.println();
            //            System.out.println(publicKey.getModulus().toString(16));
            //            System.out.println(publicKey.getPublicExponent().toString(16));
            //            System.out.println();
            //            System.out.println(privateKey.getPrivateExponent());
            //            
            //            System.out.println();

            System.out.println("Public:\r\n" + bytes2Hex(publicKey.getEncoded()));
            System.out.println();
            System.out.println("Private:\r\n" + bytes2Hex(privateKey.getEncoded()));

        } catch (Exception e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }

    private static String bytes2Hex(byte[] bytes) {
        StringBuilder buff = new StringBuilder();
        for (byte b : bytes) {
            String hex = Integer.toHexString(0xff & b);
            if (hex.length() < 2) {
                buff.append('0');
            }
            buff.append(hex);
        }
        return buff.toString();
    }
}

Related

1. generateKeyPair()
2. generateKeyPair()
3. generateKeyPair()
4. generateKeyPair()
5. generateKeyPair()
6. generateKeyPair()
7. generateKeyPair()
8. generateKeyPair()
9. generateKeyPair()