catch ( NoSuchAlgorithmException e ) {
            throw new CIFSUnsupportedCryptoException(e);
        }
    }


    /**
     * @return SHA512 digest
     */
    public static MessageDigest getSHA512 () {
        try {
            return MessageDigest.getInstance("SHA-512");
        }
        catch ( NoSuchAlgorithmException e ) {
            throw new CIFSUnsupportedCryptoException(e);
        }
    }

            throw new SmbUnsupportedOperationException();
        }

        MessageDigest dgst;
        switch ( resp.getSelectedPreauthHash() ) {
        case 1:
            dgst = Crypto.getSHA512();
            break;
        default:
            throw new SmbUnsupportedOperationException();
        }

        if ( oldHash != null ) {
            dgst.update(oldHash);
        }