}
    }

    protected Cipher pollEncryptoCipher() {
        Cipher cipher = encryptoQueue.poll();
        if (cipher == null) {
            final SecretKeySpec sksSpec = new SecretKeySpec(key.getBytes(), algorithm);
            try {
                cipher = Cipher.getInstance(algorithm);
                cipher.init(Cipher.ENCRYPT_MODE, sksSpec);

import java.security.MessageDigest;
import java.util.Arrays;
import java.util.Map;

import javax.crypto.Cipher;
import javax.crypto.Mac;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import javax.security.auth.kerberos.KerberosKey;


@SuppressWarnings ( "javadoc" )
public class PacMac {

    /**
     * 
     */
    private static final String HMAC_KEY = "HMAC";

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;

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

import org.bouncycastle.jce.provider.BouncyCastleProvider;

import jcifs.CIFSUnsupportedCryptoException;


/**
 * @author mbechler
 *
 */
public final class Crypto {

 */
package jcifs.internal.smb2;


import java.security.GeneralSecurityException;
import java.security.MessageDigest;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import jcifs.util.Crypto;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import jcifs.internal.CommonServerMessageBlock;
import jcifs.internal.SMBSigningDigest;
import jcifs.internal.util.SMBUtil;