Source Code : Wrap And Unwrap Key

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Wrap And Unwrap Key

   
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()));
  }
}

           
         
    
    
  

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