MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

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

import javax.crypto.Cipher;

public class MainClass {
    public static void main(String[] args) throws Exception {
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

        byte[] input = "abc".getBytes();
        Cipher cipher = Cipher.getInstance("RSA/None/PKCS1Padding", "BC");
        SecureRandom random = new SecureRandom();
        KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "BC");

        generator.initialize(256, random);

        KeyPair pair = generator.generateKeyPair();
        Key pubKey = pair.getPublic();
        Key privKey = pair.getPrivate();

        cipher.init(Cipher.ENCRYPT_MODE, pubKey, random);
        byte[] cipherText = cipher.doFinal(input);
        System.out.println("cipher: " + new String(cipherText));

        cipher.init(Cipher.DECRYPT_MODE, privKey);
        byte[] plainText = cipher.doFinal(cipherText);
        System.out.println("plain : " + new String(plainText));
    }
}