diff options
Diffstat (limited to 'src/main/java/com/lowagie/text/pdf/PdfEncryption.java')
| -rw-r--r-- | src/main/java/com/lowagie/text/pdf/PdfEncryption.java | 390 |
1 files changed, 0 insertions, 390 deletions
diff --git a/src/main/java/com/lowagie/text/pdf/PdfEncryption.java b/src/main/java/com/lowagie/text/pdf/PdfEncryption.java deleted file mode 100644 index 18046a8..0000000 --- a/src/main/java/com/lowagie/text/pdf/PdfEncryption.java +++ /dev/null @@ -1,390 +0,0 @@ -/*
- * $Id: PdfEncryption.java,v 1.54 2006/05/03 11:35:12 psoares33 Exp $
- * $Name: $
- *
- * Copyright 2001, 2002 Paulo Soares
- *
- * The contents of this file are subject to the Mozilla Public License Version 1.1
- * (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.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the License.
- *
- * The Original Code is 'iText, a free JAVA-PDF library'.
- *
- * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
- * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
- * All Rights Reserved.
- * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
- * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
- *
- * Contributor(s): all the names of the contributors are added in the source code
- * where applicable.
- *
- * Alternatively, the contents of this file may be used under the terms of the
- * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
- * provisions of LGPL are applicable instead of those above. If you wish to
- * allow use of your version of this file only under the terms of the LGPL
- * License and not to allow others to use your version of this file under
- * the MPL, indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by the LGPL.
- * If you do not delete the provisions above, a recipient may use your version
- * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
- *
- * This library is free software; you can redistribute it and/or modify it
- * under the terms of the MPL as stated above or under the terms of the GNU
- * Library General Public License as published by the Free Software Foundation;
- * either version 2 of the License, or any later version.
- *
- * This library 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 Library general Public License for more
- * details.
- *
- * If you didn't download this code from the following link, you should check if
- * you aren't using an obsolete version:
- * http://www.lowagie.com/iText/
- */
-
-package com.lowagie.text.pdf;
-
-import java.security.MessageDigest;
-import com.lowagie.text.ExceptionConverter;
-
-/**
- *
- * @author Paulo Soares (psoares@consiste.pt)
- * @author Kazuya Ujihara
- */
-public class PdfEncryption {
-
- static final byte pad[] = {
- (byte)0x28, (byte)0xBF, (byte)0x4E, (byte)0x5E, (byte)0x4E, (byte)0x75,
- (byte)0x8A, (byte)0x41, (byte)0x64, (byte)0x00, (byte)0x4E, (byte)0x56,
- (byte)0xFF, (byte)0xFA, (byte)0x01, (byte)0x08, (byte)0x2E, (byte)0x2E,
- (byte)0x00, (byte)0xB6, (byte)0xD0, (byte)0x68, (byte)0x3E, (byte)0x80,
- (byte)0x2F, (byte)0x0C, (byte)0xA9, (byte)0xFE, (byte)0x64, (byte)0x53,
- (byte)0x69, (byte)0x7A};
-
- byte state[] = new byte[256];
- int x;
- int y;
- /** The encryption key for a particular object/generation */
- byte key[];
- /** The encryption key length for a particular object/generation */
- int keySize;
- /** The global encryption key */
- byte mkey[];
- /** Work area to prepare the object/generation bytes */
- byte extra[] = new byte[5];
- /** The message digest algorithm MD5 */
- MessageDigest md5;
- /** The encryption key for the owner */
- byte ownerKey[] = new byte[32];
- /** The encryption key for the user */
- byte userKey[] = new byte[32];
- int permissions;
- byte documentID[];
- static long seq = System.currentTimeMillis();
-
- public PdfEncryption() {
- try {
- md5 = MessageDigest.getInstance("MD5");
- }
- catch (Exception e) {
- throw new ExceptionConverter(e);
- }
- }
-
- public PdfEncryption(PdfEncryption enc) {
- this();
- mkey = (byte[])enc.mkey.clone();
- ownerKey = (byte[])enc.ownerKey.clone();
- userKey = (byte[])enc.userKey.clone();
- permissions = enc.permissions;
- if (enc.documentID != null)
- documentID = (byte[])enc.documentID.clone();
- }
-
- /**
- */
- private byte[] padPassword(byte userPassword[]) {
- byte userPad[] = new byte[32];
- if (userPassword == null) {
- System.arraycopy(pad, 0, userPad, 0, 32);
- }
- else {
- System.arraycopy(userPassword, 0, userPad, 0, Math.min(userPassword.length, 32));
- if (userPassword.length < 32)
- System.arraycopy(pad, 0, userPad, userPassword.length, 32 - userPassword.length);
- }
-
- return userPad;
- }
-
- /**
- */
- private byte[] computeOwnerKey(byte userPad[], byte ownerPad[], int keylength, int revision) {
- byte ownerKey[] = new byte[32];
-
- byte digest[] = md5.digest(ownerPad);
- if (revision == 3) {
- byte mkey[] = new byte[keylength/8];
- // only use for the input as many bit as the key consists of
- for (int k = 0; k < 50; ++k)
- System.arraycopy(md5.digest(), 0, digest, 0, mkey.length);
- System.arraycopy(userPad, 0, ownerKey, 0, 32);
- for (int i = 0; i < 20; ++i) {
- for (int j = 0; j < mkey.length ; ++j)
- mkey[j] = (byte)(digest[j] ^ i);
- prepareRC4Key(mkey);
- encryptRC4(ownerKey);
- }
- }
- else {
- prepareRC4Key(digest, 0, 5);
- encryptRC4(userPad, ownerKey);
- }
-
- return ownerKey;
- }
-
- /**
- *
- * ownerKey, documentID must be setuped
- */
- private void setupGlobalEncryptionKey(byte[] documentID, byte userPad[], byte ownerKey[], int permissions, int keylength, int revision) {
- this.documentID = documentID;
- this.ownerKey = ownerKey;
- this.permissions = permissions;
- // use variable keylength
- mkey = new byte[keylength/8];
-
- //fixed by ujihara in order to follow PDF refrence
- md5.reset();
- md5.update(userPad);
- md5.update(ownerKey);
-
- byte ext[] = new byte[4];
- ext[0] = (byte)permissions;
- ext[1] = (byte)(permissions >> 8);
- ext[2] = (byte)(permissions >> 16);
- ext[3] = (byte)(permissions >> 24);
- md5.update(ext, 0, 4);
- if (documentID != null) md5.update(documentID);
-
- byte digest[] = new byte[mkey.length];
- System.arraycopy(md5.digest(), 0, digest, 0, mkey.length);
-
- // only use the really needed bits as input for the hash
- if (revision == 3){
- for (int k = 0; k < 50; ++k)
- System.arraycopy(md5.digest(digest), 0, digest, 0, mkey.length);
- }
-
-
- System.arraycopy(digest, 0, mkey, 0, mkey.length);
- }
-
- /**
- *
- * mkey must be setuped
- */
- // use the revision to choose the setup method
- private void setupUserKey(int revision) {
- if (revision == 3) {
- md5.update(pad);
- byte digest[] = md5.digest(documentID);
- System.arraycopy(digest, 0, userKey, 0, 16);
- for (int k = 16; k < 32; ++k)
- userKey[k] = 0;
- for (int i = 0; i < 20; ++i) {
- for (int j = 0; j < mkey.length; ++j)
- digest[j] = (byte)(mkey[j] ^ i);
- prepareRC4Key(digest, 0, mkey.length);
- encryptRC4(userKey, 0, 16);
- }
- }
- else {
- prepareRC4Key(mkey);
- encryptRC4(pad, userKey);
- }
- }
-
- // gets keylength and revision and uses revison to choose the initial values for permissions
- public void setupAllKeys(byte userPassword[], byte ownerPassword[], int permissions, int keylength, int revision) {
- if (ownerPassword == null || ownerPassword.length == 0)
- ownerPassword = md5.digest(createDocumentId());
- permissions |= revision==3 ? 0xfffff0c0 : 0xffffffc0;
- permissions &= 0xfffffffc;
- //PDF refrence 3.5.2 Standard Security Handler, Algorithum 3.3-1
- //If there is no owner password, use the user password instead.
- byte userPad[] = padPassword(userPassword);
- byte ownerPad[] = padPassword(ownerPassword);
-
- this.ownerKey = computeOwnerKey(userPad, ownerPad, keylength, revision);
- documentID = createDocumentId();
- setupByUserPad(this.documentID, userPad, this.ownerKey, permissions, keylength, revision);
- }
-
- // calls the setupAllKeys function with default values to keep the old behavior and signature
- public void setupAllKeys(byte userPassword[], byte ownerPassword[], int permissions, boolean strength128Bits) {
- setupAllKeys(userPassword, ownerPassword, permissions, strength128Bits?128:40, strength128Bits?3:2);
- }
-
- public static byte[] createDocumentId() {
- MessageDigest md5;
- try {
- md5 = MessageDigest.getInstance("MD5");
- }
- catch (Exception e) {
- throw new ExceptionConverter(e);
- }
- long time = System.currentTimeMillis();
- long mem = Runtime.getRuntime().freeMemory();
- String s = time + "+" + mem + "+" + (seq++);
- return md5.digest(s.getBytes());
- }
-
- /**
- */
- // the following functions use the new parameters for the call of the functions
- // resp. they map the call of the old functions to the changed in order to keep the
- // old behaviour and signatures
- public void setupByUserPassword(byte[] documentID, byte userPassword[], byte ownerKey[], int permissions, boolean strength128Bits) {
- setupByUserPassword(documentID, userPassword, ownerKey, permissions, strength128Bits?128:40, strength128Bits?3:2);
- }
-
- /**
- */
- public void setupByUserPassword(byte[] documentID, byte userPassword[], byte ownerKey[], int permissions, int keylength, int revision) {
- setupByUserPad(documentID, padPassword(userPassword), ownerKey, permissions, keylength, revision);
- }
-
- /**
- */
- private void setupByUserPad(byte[] documentID, byte userPad[], byte ownerKey[], int permissions, int keylength, int revision) {
- setupGlobalEncryptionKey(documentID, userPad, ownerKey, permissions, keylength, revision);
- setupUserKey(revision);
- }
-
- /**
- */
- public void setupByOwnerPassword(byte[] documentID, byte ownerPassword[], byte userKey[], byte ownerKey[], int permissions, boolean strength128Bits) {
- setupByOwnerPassword(documentID, ownerPassword, userKey, ownerKey, permissions, strength128Bits?128:40, strength128Bits?3:2);
- }
-
- /**
- */
- public void setupByOwnerPassword(byte[] documentID, byte ownerPassword[], byte userKey[], byte ownerKey[], int permissions, int keylength, int revision) {
- setupByOwnerPad(documentID, padPassword(ownerPassword), userKey, ownerKey, permissions, keylength, revision);
- }
-
- private void setupByOwnerPad(byte[] documentID, byte ownerPad[], byte userKey[], byte ownerKey[], int permissions, int keylength, int revision) {
- byte userPad[] = computeOwnerKey(ownerKey, ownerPad, keylength, revision); //userPad will be set in this.ownerKey
- setupGlobalEncryptionKey(documentID, userPad, ownerKey, permissions, keylength, revision); //step 3
- setupUserKey(revision);
- }
-
- public void prepareKey() {
- prepareRC4Key(key, 0, keySize);
- }
-
- public void setHashKey(int number, int generation) {
- md5.reset(); //added by ujihara
- extra[0] = (byte)number;
- extra[1] = (byte)(number >> 8);
- extra[2] = (byte)(number >> 16);
- extra[3] = (byte)generation;
- extra[4] = (byte)(generation >> 8);
- md5.update(mkey);
- key = md5.digest(extra);
- keySize = mkey.length + 5;
- if (keySize > 16)
- keySize = 16;
- }
-
- public static PdfObject createInfoId(byte id[]) {
- ByteBuffer buf = new ByteBuffer(90);
- buf.append('[').append('<');
- for (int k = 0; k < 16; ++k)
- buf.appendHex(id[k]);
- buf.append('>').append('<');
- id = createDocumentId();
- for (int k = 0; k < 16; ++k)
- buf.appendHex(id[k]);
- buf.append('>').append(']');
- return new PdfLiteral(buf.toByteArray());
- }
-
- public PdfDictionary getEncryptionDictionary() {
- PdfDictionary dic = new PdfDictionary();
- dic.put(PdfName.FILTER, PdfName.STANDARD);
- dic.put(PdfName.O, new PdfLiteral(PdfContentByte.escapeString(ownerKey)));
- dic.put(PdfName.U, new PdfLiteral(PdfContentByte.escapeString(userKey)));
- dic.put(PdfName.P, new PdfNumber(permissions));
- if (mkey.length > 5) {
- dic.put(PdfName.V, new PdfNumber(2));
- dic.put(PdfName.R, new PdfNumber(3));
- dic.put(PdfName.LENGTH, new PdfNumber(128));
- }
- else {
- dic.put(PdfName.V, new PdfNumber(1));
- dic.put(PdfName.R, new PdfNumber(2));
- }
- return dic;
- }
-
- public void prepareRC4Key(byte key[]) {
- prepareRC4Key(key, 0, key.length);
- }
-
- public void prepareRC4Key(byte key[], int off, int len) {
- int index1 = 0;
- int index2 = 0;
- for (int k = 0; k < 256; ++k)
- state[k] = (byte)k;
- x = 0;
- y = 0;
- byte tmp;
- for (int k = 0; k < 256; ++k) {
- index2 = (key[index1 + off] + state[k] + index2) & 255;
- tmp = state[k];
- state[k] = state[index2];
- state[index2] = tmp;
- index1 = (index1 + 1) % len;
- }
- }
-
- public void encryptRC4(byte dataIn[], int off, int len, byte dataOut[]) {
- int length = len + off;
- byte tmp;
- for (int k = off; k < length; ++k) {
- x = (x + 1) & 255;
- y = (state[x] + y) & 255;
- tmp = state[x];
- state[x] = state[y];
- state[y] = tmp;
- dataOut[k] = (byte)(dataIn[k] ^ state[(state[x] + state[y]) & 255]);
- }
- }
-
- public void encryptRC4(byte data[], int off, int len) {
- encryptRC4(data, off, len, data);
- }
-
- public void encryptRC4(byte dataIn[], byte dataOut[]) {
- encryptRC4(dataIn, 0, dataIn.length, dataOut);
- }
-
- public void encryptRC4(byte data[]) {
- encryptRC4(data, 0, data.length, data);
- }
-
- public PdfObject getFileID() {
- return createInfoId(documentID);
- }
-
-}
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