MainClass.java Source code

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Here is the source code for MainClass.java

Source

import java.security.Key;
import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;

public class MainClass {
    public static void main(String[] args) throws Exception {
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
        KeyGenerator generator = KeyGenerator.getInstance("AES", "BC");
        generator.init(128);
        Key keyToBeWrapped = generator.generateKey();
        System.out.println("input    : " + new String(keyToBeWrapped.getEncoded()));

        // create a wrapper and do the wrapping
        Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding", "BC");
        KeyGenerator keyGen = KeyGenerator.getInstance("AES", "BC");
        keyGen.init(256);
        Key wrapKey = keyGen.generateKey();
        cipher.init(Cipher.ENCRYPT_MODE, wrapKey);
        byte[] wrappedKey = cipher.doFinal(keyToBeWrapped.getEncoded());
        System.out.println("wrapped  : " + new String(wrappedKey));

        // unwrap the wrapped key
        cipher.init(Cipher.DECRYPT_MODE, wrapKey);
        Key key = new SecretKeySpec(cipher.doFinal(wrappedKey), "AES");
        System.out.println("unwrapped: " + new String(key.getEncoded()));
    }
}