import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;
import java.security.spec.RSAKeyGenParameterSpec;
import javax.crypto.Cipher;


public class teste2P1
{
    public static void main(
        String[]    args)
        throws Exception
    {
        // This is the plaintext message we wnat to encrypt

        byte[]input = new byte[] { 
	    (byte)0x00, (byte)0xAB, (byte)0xCD, (byte)0xEF ,
	    (byte)0x00, (byte)0xAB, (byte)0xCD, (byte)0xEF ,
	    (byte)0x00, (byte)0xAB, (byte)0xCD, (byte)0xEF ,
	    (byte)0x00, (byte)0xAB, (byte)0xCD, (byte)0xEF ,
	    (byte)0x00, (byte)0xAB, (byte)0xCD, (byte)0xEF ,
	    (byte)0x00, (byte)0xAB, (byte)0xCD, (byte)0xEF ,
	    (byte)0x00, (byte)0xAB, (byte)0xCD, (byte)0xEF ,
	    (byte)0x00, (byte)0xAB, (byte)0xCD, (byte)0xEF ,
	    (byte)0x00, (byte)0xAB, (byte)0xCD, (byte)0xEF ,
	    (byte)0x00, (byte)0xAB, (byte)0xCD, (byte)0xEF ,
            (byte)0x00, (byte)0xAB, (byte)0xCD, (byte)0xEF ,
            (byte)0x00, (byte)0xAB, (byte)0xCD, (byte)0xEF 
                      };


        Cipher cipher = Cipher.getInstance("RSA/NONE/PKCS1Padding", "BC");
        SecureRandom random = Utils3.createFixedRandom();
        
	// Create keypair
        KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "BC");
        
	generator.initialize(new RSAKeyGenParameterSpec(256,RSAKeyGenParameterSpec.F0),random);

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

	// This prints the input plaintext message
        System.out.println("input : " + Utils3.toHex(input));
        

	// Encrypt with the public key
        
        cipher.init(Cipher.ENCRYPT_MODE, pubKey, random);

        byte[] cipherText = cipher.doFinal(input);

	// This prints the ciphertext message

        System.out.println("cipher: " + Utils3.toHex(cipherText));
        

	// Decrypt with the private key

        cipher.init(Cipher.DECRYPT_MODE, privKey);

        byte[] plainText = cipher.doFinal(cipherText);
        
        // this prints the initial plaintext message 

        System.out.println("plain : " + Utils3.toHex(plainText));
    }
}