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iText, a free Java-PDF library
/*
* $Id: PdfEncryptor.java 5075 2012-02-27 16:36:18Z blowagie $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2012 1T3XT BVBA
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
* 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text.pdf;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import com.itextpdf.text.DocumentException;
/** This class takes any PDF and returns exactly the same but
* encrypted. All the content, links, outlines, etc, are kept.
* It is also possible to change the info dictionary.
*/
public final class PdfEncryptor {
private PdfEncryptor(){
}
/** Entry point to encrypt a PDF document. The encryption parameters are the same as in
* PdfWriter. The userPassword and the
* ownerPassword can be null or have zero length. In this case the ownerPassword
* is replaced by a random string. The open permissions for the document can be
* AllowPrinting, AllowModifyContents, AllowCopy, AllowModifyAnnotations,
* AllowFillIn, AllowScreenReaders, AllowAssembly and AllowDegradedPrinting.
* The permissions can be combined by ORing them.
* @param reader the read PDF
* @param os the output destination
* @param userPassword the user password. Can be null or empty
* @param ownerPassword the owner password. Can be null or empty
* @param permissions the user permissions
* @param strength128Bits true for 128 bit key length, false for 40 bit key length
* @throws DocumentException on error
* @throws IOException on error */
public static void encrypt(PdfReader reader, OutputStream os, byte userPassword[], byte ownerPassword[], int permissions, boolean strength128Bits) throws DocumentException, IOException {
PdfStamper stamper = new PdfStamper(reader, os);
stamper.setEncryption(userPassword, ownerPassword, permissions, strength128Bits);
stamper.close();
}
/** Entry point to encrypt a PDF document. The encryption parameters are the same as in
* PdfWriter. The userPassword and the
* ownerPassword can be null or have zero length. In this case the ownerPassword
* is replaced by a random string. The open permissions for the document can be
* AllowPrinting, AllowModifyContents, AllowCopy, AllowModifyAnnotations,
* AllowFillIn, AllowScreenReaders, AllowAssembly and AllowDegradedPrinting.
* The permissions can be combined by ORing them.
* @param reader the read PDF
* @param os the output destination
* @param userPassword the user password. Can be null or empty
* @param ownerPassword the owner password. Can be null or empty
* @param permissions the user permissions
* @param strength128Bits true for 128 bit key length, false for 40 bit key length
* @param newInfo an optional String map to add or change
* the info dictionary. Entries with null
* values delete the key in the original info dictionary
* @throws DocumentException on error
* @throws IOException on error
* @since 5.0.1 (generic type in signature)
*/
public static void encrypt(PdfReader reader, OutputStream os, byte userPassword[], byte ownerPassword[], int permissions, boolean strength128Bits, HashMap newInfo) throws DocumentException, IOException {
PdfStamper stamper = new PdfStamper(reader, os);
stamper.setEncryption(userPassword, ownerPassword, permissions, strength128Bits);
stamper.setMoreInfo(newInfo);
stamper.close();
}
/** Entry point to encrypt a PDF document. The encryption parameters are the same as in
* PdfWriter. The userPassword and the
* ownerPassword can be null or have zero length. In this case the ownerPassword
* is replaced by a random string. The open permissions for the document can be
* AllowPrinting, AllowModifyContents, AllowCopy, AllowModifyAnnotations,
* AllowFillIn, AllowScreenReaders, AllowAssembly and AllowDegradedPrinting.
* The permissions can be combined by ORing them.
* @param reader the read PDF
* @param os the output destination
* @param strength true for 128 bit key length, false for 40 bit key length
* @param userPassword the user password. Can be null or empty
* @param ownerPassword the owner password. Can be null or empty
* @param permissions the user permissions
* @throws DocumentException on error
* @throws IOException on error */
public static void encrypt(PdfReader reader, OutputStream os, boolean strength, String userPassword, String ownerPassword, int permissions) throws DocumentException, IOException {
PdfStamper stamper = new PdfStamper(reader, os);
stamper.setEncryption(strength, userPassword, ownerPassword, permissions);
stamper.close();
}
/** Entry point to encrypt a PDF document. The encryption parameters are the same as in
* PdfWriter. The userPassword and the
* ownerPassword can be null or have zero length. In this case the ownerPassword
* is replaced by a random string. The open permissions for the document can be
* AllowPrinting, AllowModifyContents, AllowCopy, AllowModifyAnnotations,
* AllowFillIn, AllowScreenReaders, AllowAssembly and AllowDegradedPrinting.
* The permissions can be combined by ORing them.
* @param reader the read PDF
* @param os the output destination
* @param strength true for 128 bit key length, false for 40 bit key length
* @param userPassword the user password. Can be null or empty
* @param ownerPassword the owner password. Can be null or empty
* @param permissions the user permissions
* @param newInfo an optional String map to add or change
* the info dictionary. Entries with null
* values delete the key in the original info dictionary
* @throws DocumentException on error
* @throws IOException on error
* @since 5.0.1 (generic type in signature)
*/
public static void encrypt(PdfReader reader, OutputStream os, boolean strength, String userPassword, String ownerPassword, int permissions, HashMap newInfo) throws DocumentException, IOException {
PdfStamper stamper = new PdfStamper(reader, os);
stamper.setEncryption(strength, userPassword, ownerPassword, permissions);
stamper.setMoreInfo(newInfo);
stamper.close();
}
/** Entry point to encrypt a PDF document. The encryption parameters are the same as in
* PdfWriter. The userPassword and the
* ownerPassword can be null or have zero length. In this case the ownerPassword
* is replaced by a random string. The open permissions for the document can be
* AllowPrinting, AllowModifyContents, AllowCopy, AllowModifyAnnotations,
* AllowFillIn, AllowScreenReaders, AllowAssembly and AllowDegradedPrinting.
* The permissions can be combined by ORing them.
* @param reader the read PDF
* @param os the output destination
* @param type the type of encryption. It can be one of STANDARD_ENCRYPTION_40, STANDARD_ENCRYPTION_128 or ENCRYPTION_AES128.
* Optionally DO_NOT_ENCRYPT_METADATA can be ored to output the metadata in cleartext
* @param userPassword the user password. Can be null or empty
* @param ownerPassword the owner password. Can be null or empty
* @param permissions the user permissions
* @param newInfo an optional String map to add or change
* the info dictionary. Entries with null
* values delete the key in the original info dictionary
* @throws DocumentException on error
* @throws IOException on error
* @since 5.0.1 (generic type in signature)
*/
public static void encrypt(PdfReader reader, OutputStream os, int type, String userPassword, String ownerPassword, int permissions, HashMap newInfo) throws DocumentException, IOException {
PdfStamper stamper = new PdfStamper(reader, os);
stamper.setEncryption(type, userPassword, ownerPassword, permissions);
stamper.setMoreInfo(newInfo);
stamper.close();
}
/** Entry point to encrypt a PDF document. The encryption parameters are the same as in
* PdfWriter. The userPassword and the
* ownerPassword can be null or have zero length. In this case the ownerPassword
* is replaced by a random string. The open permissions for the document can be
* AllowPrinting, AllowModifyContents, AllowCopy, AllowModifyAnnotations,
* AllowFillIn, AllowScreenReaders, AllowAssembly and AllowDegradedPrinting.
* The permissions can be combined by ORing them.
* @param reader the read PDF
* @param os the output destination
* @param type the type of encryption. It can be one of STANDARD_ENCRYPTION_40, STANDARD_ENCRYPTION_128 or ENCRYPTION_AES128.
* Optionally DO_NOT_ENCRYPT_METADATA can be ored to output the metadata in cleartext
* @param userPassword the user password. Can be null or empty
* @param ownerPassword the owner password. Can be null or empty
* @param permissions the user permissions
* values delete the key in the original info dictionary
* @throws DocumentException on error
* @throws IOException on error
*/
public static void encrypt(PdfReader reader, OutputStream os, int type, String userPassword, String ownerPassword, int permissions) throws DocumentException, IOException {
PdfStamper stamper = new PdfStamper(reader, os);
stamper.setEncryption(type, userPassword, ownerPassword, permissions);
stamper.close();
}
/**
* Give you a verbose analysis of the permissions.
* @param permissions the permissions value of a PDF file
* @return a String that explains the meaning of the permissions value
*/
public static String getPermissionsVerbose(int permissions) {
StringBuffer buf = new StringBuffer("Allowed:");
if ((PdfWriter.ALLOW_PRINTING & permissions) == PdfWriter.ALLOW_PRINTING) buf.append(" Printing");
if ((PdfWriter.ALLOW_MODIFY_CONTENTS & permissions) == PdfWriter.ALLOW_MODIFY_CONTENTS) buf.append(" Modify contents");
if ((PdfWriter.ALLOW_COPY & permissions) == PdfWriter.ALLOW_COPY) buf.append(" Copy");
if ((PdfWriter.ALLOW_MODIFY_ANNOTATIONS & permissions) == PdfWriter.ALLOW_MODIFY_ANNOTATIONS) buf.append(" Modify annotations");
if ((PdfWriter.ALLOW_FILL_IN & permissions) == PdfWriter.ALLOW_FILL_IN) buf.append(" Fill in");
if ((PdfWriter.ALLOW_SCREENREADERS & permissions) == PdfWriter.ALLOW_SCREENREADERS) buf.append(" Screen readers");
if ((PdfWriter.ALLOW_ASSEMBLY & permissions) == PdfWriter.ALLOW_ASSEMBLY) buf.append(" Assembly");
if ((PdfWriter.ALLOW_DEGRADED_PRINTING & permissions) == PdfWriter.ALLOW_DEGRADED_PRINTING) buf.append(" Degraded printing");
return buf.toString();
}
/**
* Tells you if printing is allowed.
* @param permissions the permissions value of a PDF file
* @return true if printing is allowed
*
* @since 2.0.7
*/
public static boolean isPrintingAllowed(int permissions) {
return (PdfWriter.ALLOW_PRINTING & permissions) == PdfWriter.ALLOW_PRINTING;
}
/**
* Tells you if modifying content is allowed.
* @param permissions the permissions value of a PDF file
* @return true if modifying content is allowed
*
* @since 2.0.7
*/
public static boolean isModifyContentsAllowed(int permissions) {
return (PdfWriter.ALLOW_MODIFY_CONTENTS & permissions) == PdfWriter.ALLOW_MODIFY_CONTENTS;
}
/**
* Tells you if copying is allowed.
* @param permissions the permissions value of a PDF file
* @return true if copying is allowed
*
* @since 2.0.7
*/
public static boolean isCopyAllowed(int permissions) {
return (PdfWriter.ALLOW_COPY & permissions) == PdfWriter.ALLOW_COPY;
}
/**
* Tells you if modifying annotations is allowed.
* @param permissions the permissions value of a PDF file
* @return true if modifying annotations is allowed
*
* @since 2.0.7
*/
public static boolean isModifyAnnotationsAllowed(int permissions) {
return (PdfWriter.ALLOW_MODIFY_ANNOTATIONS & permissions) == PdfWriter.ALLOW_MODIFY_ANNOTATIONS;
}
/**
* Tells you if filling in fields is allowed.
* @param permissions the permissions value of a PDF file
* @return true if filling in fields is allowed
*
* @since 2.0.7
*/
public static boolean isFillInAllowed(int permissions) {
return (PdfWriter.ALLOW_FILL_IN & permissions) == PdfWriter.ALLOW_FILL_IN;
}
/**
* Tells you if repurposing for screenreaders is allowed.
* @param permissions the permissions value of a PDF file
* @return true if repurposing for screenreaders is allowed
*
* @since 2.0.7
*/
public static boolean isScreenReadersAllowed(int permissions) {
return (PdfWriter.ALLOW_SCREENREADERS & permissions) == PdfWriter.ALLOW_SCREENREADERS;
}
/**
* Tells you if document assembly is allowed.
* @param permissions the permissions value of a PDF file
* @return true if document assembly is allowed
*
* @since 2.0.7
*/
public static boolean isAssemblyAllowed(int permissions) {
return (PdfWriter.ALLOW_ASSEMBLY & permissions) == PdfWriter.ALLOW_ASSEMBLY;
}
/**
* Tells you if degraded printing is allowed.
* @param permissions the permissions value of a PDF file
* @return true if degraded printing is allowed
*
* @since 2.0.7
*/
public static boolean isDegradedPrintingAllowed(int permissions) {
return (PdfWriter.ALLOW_DEGRADED_PRINTING & permissions) == PdfWriter.ALLOW_DEGRADED_PRINTING;
}
}
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