Rc4Provider.java

package org.apache.kerberos.kerb.crypto.enc.provider;

import org.apache.kerberos.kerb.KrbException;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.security.GeneralSecurityException;

public class Rc4Provider extends AbstractEncryptProvider {

    public Rc4Provider() {
        super(1, 16, 16);
    }

    @Override
    protected void doEncrypt(byte[] data, byte[] key,
                             byte[] cipherState, boolean encrypt) throws KrbException {
        try {
            Cipher cipher = Cipher.getInstance("ARCFOUR");
            SecretKeySpec secretKey = new SecretKeySpec(key, "ARCFOUR");
            cipher.init(encrypt ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE, secretKey);
            byte[] output = cipher.doFinal(data);
            System.arraycopy(output, 0, data, 0, output.length);
        } catch (GeneralSecurityException e) {
            KrbException ke = new KrbException(e.getMessage());
            ke.initCause(e);
            throw ke;
        }
    }
}