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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.
*/
package org.sejda.sambox.pdmodel.encryption;
/**
* This class represents the protection policy to apply to a document.
*
* Objects implementing this abstract class can be passed to the protect method of PDDocument
* to protect a document.
*
*
* @author Benoit Guillon (benoit.guillon@snv.jussieu.fr)
*/
public abstract class ProtectionPolicy
{
private static final int DEFAULT_KEY_LENGTH = 40;
private int encryptionKeyLength = DEFAULT_KEY_LENGTH;
/**
* set the length in (bits) of the secret key that will be
* used to encrypt document data.
* The default value is 40 bits, which provides a low security level
* but is compatible with old versions of Acrobat Reader.
*
* @param l the length in bits (must be 40, 128 or 256)
*/
public void setEncryptionKeyLength(int l)
{
if(l!=40 && l!=128 && l!=256)
{
throw new IllegalArgumentException("Invalid key length '" + l + "' value must be 40, 128 or 256!");
}
encryptionKeyLength = l;
}
/**
* Get the length of the secrete key that will be used to encrypt
* document data.
*
* @return The length (in bits) of the encryption key.
*/
public int getEncryptionKeyLength()
{
return encryptionKeyLength;
}
}
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