Mercurial > hg > Applications > TightVNC_orginal

annotate src/main/java/com/glavsoft/rfb/protocol/auth/VncAuthentication.java @ 52:472a9bcacb21 draft default tip

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TightVNC 2.7.1.0
author you@cr.ie.u-ryukyu.ac.jp
date Wed, 07 Aug 2013 19:01:17 +0900
parents 4689cc86d6cb
children
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52
472a9bcacb21 TightVNC 2.7.1.0
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1 // Copyright (C) 2010, 2011, 2012, 2013 GlavSoft LLC.
0
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2 // All rights reserved.
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3 //
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4 //-------------------------------------------------------------------------
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5 // This file is part of the TightVNC software. Please visit our Web site:
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6 //
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7 // http://www.tightvnc.com/
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8 //
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9 // This program is free software; you can redistribute it and/or modify
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10 // it under the terms of the GNU General Public License as published by
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11 // the Free Software Foundation; either version 2 of the License, or
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12 // (at your option) any later version.
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13 //
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14 // This program is distributed in the hope that it will be useful,
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15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 // GNU General Public License for more details.
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18 //
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19 // You should have received a copy of the GNU General Public License along
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20 // with this program; if not, write to the Free Software Foundation, Inc.,
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21 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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22 //-------------------------------------------------------------------------
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23 //
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24
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25 package com.glavsoft.rfb.protocol.auth;
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26
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27 import com.glavsoft.exceptions.CryptoException;
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28 import com.glavsoft.exceptions.FatalException;
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29 import com.glavsoft.exceptions.TransportException;
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30 import com.glavsoft.rfb.CapabilityContainer;
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31 import com.glavsoft.rfb.IPasswordRetriever;
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32 import com.glavsoft.transport.Reader;
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33 import com.glavsoft.transport.Writer;
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34
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35 import javax.crypto.*;
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36 import javax.crypto.spec.DESKeySpec;
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37 import java.security.InvalidKeyException;
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38 import java.security.NoSuchAlgorithmException;
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39 import java.security.spec.InvalidKeySpecException;
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40
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41 public class VncAuthentication extends AuthHandler {
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42 @Override
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43 public SecurityType getType() {
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44 return SecurityType.VNC_AUTHENTICATION;
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45 }
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46
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47 @Override
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48 public boolean authenticate(Reader reader,
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49 Writer writer, CapabilityContainer authCaps, IPasswordRetriever passwordRetriever)
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50 throws TransportException, FatalException {
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51 byte [] challenge = reader.readBytes(16);
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52 String password = passwordRetriever.getPassword();
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53 if (null == password) return false;
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54 byte [] key = new byte[8];
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55 System.arraycopy(password.getBytes(), 0, key, 0, Math.min(key.length, password.getBytes().length));
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56 writer.write(encrypt(challenge, key));
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57 return false;
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58 }
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59
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60 /**
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61 * Encript challenge by key using DES
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62 * @return encripted bytes
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63 * @throws CryptoException on problem with DES algorithm support or smth about
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64 */
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65 public byte[] encrypt(byte[] challenge, byte[] key) throws CryptoException {
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66 try {
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67 DESKeySpec desKeySpec = new DESKeySpec(mirrorBits(key));
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68 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
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69 SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
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70 Cipher desCipher = Cipher.getInstance("DES/ECB/NoPadding");
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71 desCipher.init(Cipher.ENCRYPT_MODE, secretKey);
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72 return desCipher.doFinal(challenge);
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73 } catch (NoSuchAlgorithmException e) {
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74 throw new CryptoException("Cannot encrypt challenge", e);
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75 } catch (NoSuchPaddingException e) {
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76 throw new CryptoException("Cannot encrypt challenge", e);
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77 } catch (IllegalBlockSizeException e) {
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78 throw new CryptoException("Cannot encrypt challenge", e);
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79 } catch (BadPaddingException e) {
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80 throw new CryptoException("Cannot encrypt challenge", e);
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81 } catch (InvalidKeyException e) {
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82 throw new CryptoException("Cannot encrypt challenge", e);
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83 } catch (InvalidKeySpecException e) {
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84 throw new CryptoException("Cannot encrypt challenge", e);
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85 }
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86 }
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87
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88 private byte[] mirrorBits(byte[] k) {
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89 byte[] key = new byte[8];
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90 for (int i = 0; i < 8; i++) {
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91 byte s = k[i];
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92 s = (byte) (((s >> 1) & 0x55) | ((s << 1) & 0xaa));
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93 s = (byte) (((s >> 2) & 0x33) | ((s << 2) & 0xcc));
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94 s = (byte) (((s >> 4) & 0x0f) | ((s << 4) & 0xf0));
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95 key[i] = s;
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96 }
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97 return key;
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98 }
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99
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100 }