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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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