diff options
Diffstat (limited to 'src/main/java/org/pdfbox/encryption/DocumentEncryption.java')
| -rw-r--r-- | src/main/java/org/pdfbox/encryption/DocumentEncryption.java | 427 |
1 files changed, 0 insertions, 427 deletions
diff --git a/src/main/java/org/pdfbox/encryption/DocumentEncryption.java b/src/main/java/org/pdfbox/encryption/DocumentEncryption.java deleted file mode 100644 index 9ae6936..0000000 --- a/src/main/java/org/pdfbox/encryption/DocumentEncryption.java +++ /dev/null @@ -1,427 +0,0 @@ -/**
- * Copyright (c) 2003-2004, www.pdfbox.org
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. Neither the name of pdfbox; nor the names of its
- * contributors may be used to endorse or promote products derived from this
- * software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * http://www.pdfbox.org
- *
- */
-package org.pdfbox.encryption;
-
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.InputStream;
-import java.io.IOException;
-
-import java.math.BigInteger;
-
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Set;
-
-import org.pdfbox.exceptions.CryptographyException;
-import org.pdfbox.exceptions.InvalidPasswordException;
-
-import org.pdfbox.cos.COSArray;
-import org.pdfbox.cos.COSBase;
-import org.pdfbox.cos.COSDictionary;
-import org.pdfbox.cos.COSDocument;
-import org.pdfbox.cos.COSName;
-import org.pdfbox.cos.COSObject;
-import org.pdfbox.cos.COSStream;
-import org.pdfbox.cos.COSString;
-
-import org.pdfbox.pdmodel.PDDocument;
-
-import org.pdfbox.pdmodel.encryption.PDStandardEncryption;
-
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-
-/**
- * This class will deal with encrypting/decrypting a document.
- *
- * @author Ben Litchfield (ben@benlitchfield.com)
- * @version $Revision: 1.10 $
- */
-public class DocumentEncryption
-{
- private PDDocument pdDocument = null;
- private COSDocument document = null;
-
- private byte[] encryptionKey = null;
- private PDFEncryption encryption = new PDFEncryption();
-
- private Set objects = new HashSet();
-
- /**
- * A set that contains potential signature dictionaries. This is used
- * because the Contents entry of the signature is not encrypted.
- */
- private Set potentialSignatures = new HashSet();
-
- /**
- * Constructor.
- *
- * @param doc The document to decrypt.
- */
- public DocumentEncryption( PDDocument doc )
- {
- pdDocument = doc;
- document = doc.getDocument();
- }
-
- /**
- * Constructor.
- *
- * @param doc The document to decrypt.
- */
- public DocumentEncryption( COSDocument doc )
- {
- pdDocument = new PDDocument( doc );
- document = doc;
- }
-
- /**
- * This will encrypt the given document, given the owner password and user password.
- * The encryption method used is the standard filter.
- *
- * @throws CryptographyException If an error occurs during encryption.
- * @throws IOException If there is an error accessing the data.
- */
- public void initForEncryption()
- throws CryptographyException, IOException
- {
- String ownerPassword = pdDocument.getOwnerPasswordForEncryption();
- String userPassword = pdDocument.getUserPasswordForEncryption();
- if( ownerPassword == null )
- {
- ownerPassword = "";
- }
- if( userPassword == null )
- {
- userPassword = "";
- }
- PDStandardEncryption encParameters = (PDStandardEncryption)pdDocument.getEncryptionDictionary();
- int permissionInt = encParameters.getPermissions();
- int revision = encParameters.getRevision();
- int length = encParameters.getLength()/8;
- COSArray idArray = document.getDocumentID();
-
- //check if the document has an id yet. If it does not then
- //generate one
- if( idArray == null || idArray.size() < 2 )
- {
- idArray = new COSArray();
- try
- {
- MessageDigest md = MessageDigest.getInstance( "MD5" );
- BigInteger time = BigInteger.valueOf( System.currentTimeMillis() );
- md.update( time.toByteArray() );
- md.update( ownerPassword.getBytes() );
- md.update( userPassword.getBytes() );
- md.update( document.toString().getBytes() );
- byte[] id = md.digest( this.toString().getBytes() );
- COSString idString = new COSString();
- idString.append( id );
- idArray.add( idString );
- idArray.add( idString );
- document.setDocumentID( idArray );
- }
- catch( NoSuchAlgorithmException e )
- {
- throw new CryptographyException( e );
- }
-
- }
- COSString id = (COSString)idArray.getObject( 0 );
- encryption = new PDFEncryption();
-
- byte[] o = encryption.computeOwnerPassword(
- ownerPassword.getBytes("ISO-8859-1"),
- userPassword.getBytes("ISO-8859-1"), revision, length);
-
- byte[] u = encryption.computeUserPassword(
- userPassword.getBytes("ISO-8859-1"),
- o, permissionInt, id.getBytes(), revision, length);
-
- encryptionKey = encryption.computeEncryptedKey(
- userPassword.getBytes("ISO-8859-1"), o, permissionInt, id.getBytes(), revision, length);
-
- encParameters.setOwnerKey( o );
- encParameters.setUserKey( u );
-
- document.setEncryptionDictionary( encParameters.getCOSDictionary() );
- }
-
-
-
- /**
- * This will decrypt the document.
- *
- * @param password The password for the document.
- *
- * @throws CryptographyException If there is an error decrypting the document.
- * @throws IOException If there is an error getting the stream data.
- * @throws InvalidPasswordException If the password is not a user or owner password.
- */
- public void decryptDocument( String password )
- throws CryptographyException, IOException, InvalidPasswordException
- {
- if( password == null )
- {
- password = "";
- }
-
- PDStandardEncryption encParameters = (PDStandardEncryption)pdDocument.getEncryptionDictionary();
-
-
- int permissions = encParameters.getPermissions();
- int revision = encParameters.getRevision();
- int length = encParameters.getLength()/8;
-
- COSString id = (COSString)document.getDocumentID().getObject( 0 );
- byte[] u = encParameters.getUserKey();
- byte[] o = encParameters.getOwnerKey();
-
- boolean isUserPassword =
- encryption.isUserPassword( password.getBytes(), u,
- o, permissions, id.getBytes(), revision, length );
- boolean isOwnerPassword =
- encryption.isOwnerPassword( password.getBytes(), u,
- o, permissions, id.getBytes(), revision, length );
-
- if( isUserPassword )
- {
- encryptionKey =
- encryption.computeEncryptedKey(
- password.getBytes(), o,
- permissions, id.getBytes(), revision, length );
- }
- else if( isOwnerPassword )
- {
- byte[] computedUserPassword =
- encryption.getUserPassword(
- password.getBytes(),
- o,
- revision,
- length );
- encryptionKey =
- encryption.computeEncryptedKey(
- computedUserPassword, o,
- permissions, id.getBytes(), revision, length );
- }
- else
- {
- throw new InvalidPasswordException( "Error: The supplied password does not match " +
- "either the owner or user password in the document." );
- }
-
- COSDictionary trailer = document.getTrailer();
- COSArray fields = (COSArray)trailer.getObjectFromPath( "Root/AcroForm/Fields" );
-
- //We need to collect all the signature dictionaries, for some
- //reason the 'Contents' entry of signatures is not really encrypted
- if( fields != null )
- {
- for( int i=0; i<fields.size(); i++ )
- {
- COSDictionary field = (COSDictionary)fields.getObject( i );
- addDictionaryAndSubDictionary( potentialSignatures, field );
- }
- }
-
- List allObjects = document.getObjects();
- Iterator objectIter = allObjects.iterator();
- while( objectIter.hasNext() )
- {
- decryptObject( (COSObject)objectIter.next() );
- }
- document.setEncryptionDictionary( null );
- }
-
- private void addDictionaryAndSubDictionary( Set set, COSDictionary dic )
- {
- set.add( dic );
- COSArray kids = (COSArray)dic.getDictionaryObject( "Kids" );
- for( int i=0; kids != null && i<kids.size(); i++ )
- {
- addDictionaryAndSubDictionary( set, (COSDictionary)kids.getObject( i ) );
- }
- COSBase value = dic.getDictionaryObject( "V" );
- if( value instanceof COSDictionary )
- {
- addDictionaryAndSubDictionary( set, (COSDictionary)value );
- }
- }
-
- /**
- * This will decrypt an object in the document.
- *
- * @param object The object to decrypt.
- *
- * @throws CryptographyException If there is an error decrypting the stream.
- * @throws IOException If there is an error getting the stream data.
- */
- private void decryptObject( COSObject object )
- throws CryptographyException, IOException
- {
- long objNum = object.getObjectNumber().intValue();
- long genNum = object.getGenerationNumber().intValue();
- COSBase base = object.getObject();
- decrypt( base, objNum, genNum );
- }
-
- /**
- * This will dispatch to the correct method.
- *
- * @param obj The object to decrypt.
- * @param objNum The object number.
- * @param genNum The object generation Number.
- *
- * @throws CryptographyException If there is an error decrypting the stream.
- * @throws IOException If there is an error getting the stream data.
- */
- private void decrypt( Object obj, long objNum, long genNum )
- throws CryptographyException, IOException
- {
- if( !objects.contains( obj ) )
- {
- objects.add( obj );
-
- if( obj instanceof COSString )
- {
- decryptString( (COSString)obj, objNum, genNum );
- }
- else if( obj instanceof COSStream )
- {
- decryptStream( (COSStream)obj, objNum, genNum );
- }
- else if( obj instanceof COSDictionary )
- {
- decryptDictionary( (COSDictionary)obj, objNum, genNum );
- }
- else if( obj instanceof COSArray )
- {
- decryptArray( (COSArray)obj, objNum, genNum );
- }
- }
- }
-
- /**
- * This will decrypt a stream.
- *
- * @param stream The stream to decrypt.
- * @param objNum The object number.
- * @param genNum The object generation number.
- *
- * @throws CryptographyException If there is an error getting the stream.
- * @throws IOException If there is an error getting the stream data.
- */
- public void decryptStream( COSStream stream, long objNum, long genNum )
- throws CryptographyException, IOException
- {
- decryptDictionary( stream, objNum, genNum );
- InputStream encryptedStream = stream.getFilteredStream();
- encryption.encryptData( objNum,
- genNum,
- encryptionKey,
- encryptedStream,
- stream.createFilteredStream() );
- }
-
- /**
- * This will decrypt a dictionary.
- *
- * @param dictionary The dictionary to decrypt.
- * @param objNum The object number.
- * @param genNum The object generation number.
- *
- * @throws CryptographyException If there is an error decrypting the document.
- * @throws IOException If there is an error creating a new string.
- */
- private void decryptDictionary( COSDictionary dictionary, long objNum, long genNum )
- throws CryptographyException, IOException
- {
- Iterator keys = dictionary.keyList().iterator();
- while( keys.hasNext() )
- {
- COSName key = (COSName)keys.next();
- Object value = dictionary.getItem( key );
- //if we are a signature dictionary and contain a Contents entry then
- //we don't decrypt it.
- if( !(key.getName().equals( "Contents" ) &&
- value instanceof COSString &&
- potentialSignatures.contains( dictionary )))
- {
- decrypt( value, objNum, genNum );
- }
- }
- }
-
- /**
- * This will decrypt a string.
- *
- * @param string the string to decrypt.
- * @param objNum The object number.
- * @param genNum The object generation number.
- *
- * @throws CryptographyException If an error occurs during decryption.
- * @throws IOException If an error occurs writing the new string.
- */
- public void decryptString( COSString string, long objNum, long genNum )
- throws CryptographyException, IOException
- {
- ByteArrayInputStream data = new ByteArrayInputStream( string.getBytes() );
- ByteArrayOutputStream buffer = new ByteArrayOutputStream();
- encryption.encryptData( objNum,
- genNum,
- encryptionKey,
- data,
- buffer );
- string.reset();
- string.append( buffer.toByteArray() );
- }
-
- /**
- * This will decrypt an array.
- *
- * @param array The array to decrypt.
- * @param objNum The object number.
- * @param genNum The object generation number.
- *
- * @throws CryptographyException If an error occurs during decryption.
- * @throws IOException If there is an error accessing the data.
- */
- private void decryptArray( COSArray array, long objNum, long genNum )
- throws CryptographyException, IOException
- {
- for( int i=0; i<array.size(); i++ )
- {
- decrypt( array.get( i ), objNum, genNum );
- }
- }
-}
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