Mercurial > hg > Applications > tvnjviewer

comparison src/main/java/com/glavsoft/rfb/protocol/auth/VncAuthentication.java @ 0:daa24f8a557b

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TightVNC original
author YU
date Thu, 11 Sep 2014 07:30:03 +0900
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-1:000000000000 0:daa24f8a557b
1 // Copyright (C) 2010, 2011, 2012, 2013 GlavSoft LLC.
2 // All rights reserved.
3 //
4 //-------------------------------------------------------------------------
5 // This file is part of the TightVNC software. Please visit our Web site:
6 //
7 // http://www.tightvnc.com/
8 //
9 // This program is free software; you can redistribute it and/or modify
10 // it under the terms of the GNU General Public License as published by
11 // the Free Software Foundation; either version 2 of the License, or
12 // (at your option) any later version.
13 //
14 // This program is distributed in the hope that it will be useful,
15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 // GNU General Public License for more details.
18 //
19 // You should have received a copy of the GNU General Public License along
20 // with this program; if not, write to the Free Software Foundation, Inc.,
21 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 //-------------------------------------------------------------------------
23 //
24
25 package com.glavsoft.rfb.protocol.auth;
26
27 import com.glavsoft.exceptions.CryptoException;
28 import com.glavsoft.exceptions.FatalException;
29 import com.glavsoft.exceptions.TransportException;
30 import com.glavsoft.rfb.CapabilityContainer;
31 import com.glavsoft.rfb.IPasswordRetriever;
32 import com.glavsoft.transport.Reader;
33 import com.glavsoft.transport.Writer;
34
35 import javax.crypto.*;
36 import javax.crypto.spec.DESKeySpec;
37 import java.security.InvalidKeyException;
38 import java.security.NoSuchAlgorithmException;
39 import java.security.spec.InvalidKeySpecException;
40
41 public class VncAuthentication extends AuthHandler {
42 @Override
43 public SecurityType getType() {
44 return SecurityType.VNC_AUTHENTICATION;
45 }
46
47 @Override
48 public boolean authenticate(Reader reader,
49 Writer writer, CapabilityContainer authCaps, IPasswordRetriever passwordRetriever)
50 throws TransportException, FatalException {
51 byte [] challenge = reader.readBytes(16);
52 String password = passwordRetriever.getPassword();
53 if (null == password) return false;
54 byte [] key = new byte[8];
55 System.arraycopy(password.getBytes(), 0, key, 0, Math.min(key.length, password.getBytes().length));
56 writer.write(encrypt(challenge, key));
57 return false;
58 }
59
60 /**
61 * Encript challenge by key using DES
62 * @return encripted bytes
63 * @throws CryptoException on problem with DES algorithm support or smth about
64 */
65 public byte[] encrypt(byte[] challenge, byte[] key) throws CryptoException {
66 try {
67 DESKeySpec desKeySpec = new DESKeySpec(mirrorBits(key));
68 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
69 SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
70 Cipher desCipher = Cipher.getInstance("DES/ECB/NoPadding");
71 desCipher.init(Cipher.ENCRYPT_MODE, secretKey);
72 return desCipher.doFinal(challenge);
73 } catch (NoSuchAlgorithmException e) {
74 throw new CryptoException("Cannot encrypt challenge", e);
75 } catch (NoSuchPaddingException e) {
76 throw new CryptoException("Cannot encrypt challenge", e);
77 } catch (IllegalBlockSizeException e) {
78 throw new CryptoException("Cannot encrypt challenge", e);
79 } catch (BadPaddingException e) {
80 throw new CryptoException("Cannot encrypt challenge", e);
81 } catch (InvalidKeyException e) {
82 throw new CryptoException("Cannot encrypt challenge", e);
83 } catch (InvalidKeySpecException e) {
84 throw new CryptoException("Cannot encrypt challenge", e);
85 }
86 }
87
88 private byte[] mirrorBits(byte[] k) {
89 byte[] key = new byte[8];
90 for (int i = 0; i < 8; i++) {
91 byte s = k[i];
92 s = (byte) (((s >> 1) & 0x55) | ((s << 1) & 0xaa));
93 s = (byte) (((s >> 2) & 0x33) | ((s << 2) & 0xcc));
94 s = (byte) (((s >> 4) & 0x0f) | ((s << 4) & 0xf0));
95 key[i] = s;
96 }
97 return key;
98 }
99
100 }