From 13d6dc3a6a5e8bd3c17997351a0e6f087eb301a2 Mon Sep 17 00:00:00 2001 From: tknall Date: Tue, 25 Nov 2008 12:04:30 +0000 Subject: Removing itext from source. git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@302 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c --- .../java/com/lowagie/text/pdf/PdfEncryption.java | 390 --------------------- 1 file changed, 390 deletions(-) delete mode 100644 src/main/java/com/lowagie/text/pdf/PdfEncryption.java (limited to 'src/main/java/com/lowagie/text/pdf/PdfEncryption.java') 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); - } - -} -- cgit v1.2.3