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.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

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

        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
        SecureRandom random = new SecureRandom();

        KeyPairGenerator fact = KeyPairGenerator.getInstance("RSA", "BC");
        fact.initialize(1024, random);

        KeyPair keyPair = fact.generateKeyPair();
        Key wrapKey = createKeyForAES(256, random);
        cipher.init(Cipher.WRAP_MODE, wrapKey);

        byte[] wrappedKey = cipher.wrap(keyPair.getPrivate());
        cipher.init(Cipher.UNWRAP_MODE, wrapKey);
        Key key = cipher.unwrap(wrappedKey, "RSA", Cipher.PRIVATE_KEY);
        System.out.println(keyPair.getPrivate().equals(key));

    }

    public static SecretKey createKeyForAES(int bitLength, SecureRandom random)
            throws NoSuchAlgorithmException, NoSuchProviderException {
        KeyGenerator generator = KeyGenerator.getInstance("AES", "BC");
        generator.init(128, random);
        return generator.generateKey();
    }
}