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- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
- /* $Id$ */
-
- package org.apache.fop.pdf;
-
- /**
- * This interface defines the contract for classes implementing PDF encryption.
- */
- public interface PDFEncryption {
-
- /**
- * Adds a PDFFilter to the PDFStream object
- * @param stream the stream to add an encryption filter to
- */
- void applyFilter(AbstractPDFStream stream);
-
- /**
- * Encrypt an array of bytes using a reference PDFObject for calculating
- * the encryption key.
- * @param data data to encrypt
- * @param refObj reference PDFObject
- * @return byte[] the encrypted data
- */
- byte[] encrypt(byte[] data, PDFObject refObj);
-
- /**
- * Returns the /Encrypt entry in the file trailer dictionary.
- *
- * @return the string "/Encrypt n g R\n" where n and g are the number and generation
- * of the document's encryption dictionary
- */
- String getTrailerEntry();
-
- /**
- * Returns the PDF version required by the current encryption algorithm.
- * @return the PDF Version
- */
- Version getPDFVersion();
- }
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