if (blob != null) {
            System.arraycopy(blob, 0, dst, dstIndex, blob.length );
            dstIndex += blob.length;
        } else {
            System.arraycopy( lmHash, 0, dst, dstIndex, lmHash.length );
            dstIndex += lmHash.length;
            System.arraycopy( ntHash, 0, dst, dstIndex, ntHash.length );
            dstIndex += ntHash.length;
    

            System.arraycopy(this.blob, 0, dst, dstIndex, this.blob.length);
            dstIndex += this.blob.length;
        }
        else {
            System.arraycopy(this.lmHash, 0, dst, dstIndex, this.lmHash.length);
            dstIndex += this.lmHash.length;
            System.arraycopy(this.ntHash, 0, dst, dstIndex, this.ntHash.length);
            dstIndex += this.ntHash.length;

        case 1:
            dgst = Crypto.getSHA512();
            break;
        default:
            throw new SmbUnsupportedOperationException();
        }

        if ( oldHash != null ) {
            dgst.update(oldHash);
        }
        dgst.update(input, off, len);
        return dgst.digest();
    }


    Cipher createEncryptionCipher ( byte[] key ) throws CIFSException {