annotate src/ch/ethz/ssh2/crypto/cipher/BlockCipherFactory.java @ 339:cd1d87edcbf6 ganymed

fixed hang during connection, restore synchronized methods
author Carl Byington <carl@five-ten-sg.com>
date Thu, 31 Jul 2014 15:17:31 -0700
parents 071eccdff8ea
children 8c1451f51a5e
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1 /*
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2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
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3 * Please refer to the LICENSE.txt for licensing details.
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4 */
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5 package ch.ethz.ssh2.crypto.cipher;
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6
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7 import java.util.ArrayList;
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8 import java.util.List;
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9 import java.util.Vector;
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10
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11 /**
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12 * BlockCipherFactory.
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13 *
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14 * @author Christian Plattner
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15 * @version $Id: BlockCipherFactory.java 86 2014-04-07 14:15:18Z dkocher@sudo.ch $
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16 */
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17 public class BlockCipherFactory {
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18 private static final class CipherEntry {
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19 String type;
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20 int blocksize;
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21 int keysize;
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22 String cipherClass;
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23
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24 public CipherEntry(String type, int blockSize, int keySize, String cipherClass) {
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25 this.type = type;
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26 this.blocksize = blockSize;
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27 this.keysize = keySize;
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28 this.cipherClass = cipherClass;
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29 }
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30 }
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31
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32 private static final List<CipherEntry> ciphers = new ArrayList<CipherEntry>();
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33
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34 static {
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35 /* Higher Priority First */
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36 ciphers.add(new CipherEntry("aes128-ctr", 16, 16, "ch.ethz.ssh2.crypto.cipher.AES"));
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37 ciphers.add(new CipherEntry("aes192-ctr", 16, 24, "ch.ethz.ssh2.crypto.cipher.AES"));
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38 ciphers.add(new CipherEntry("aes256-ctr", 16, 32, "ch.ethz.ssh2.crypto.cipher.AES"));
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39 ciphers.add(new CipherEntry("blowfish-ctr", 8, 16, "ch.ethz.ssh2.crypto.cipher.BlowFish"));
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40 ciphers.add(new CipherEntry("aes128-cbc", 16, 16, "ch.ethz.ssh2.crypto.cipher.AES"));
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41 ciphers.add(new CipherEntry("aes192-cbc", 16, 24, "ch.ethz.ssh2.crypto.cipher.AES"));
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42 ciphers.add(new CipherEntry("aes256-cbc", 16, 32, "ch.ethz.ssh2.crypto.cipher.AES"));
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43 ciphers.add(new CipherEntry("blowfish-cbc", 8, 16, "ch.ethz.ssh2.crypto.cipher.BlowFish"));
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44 ciphers.add(new CipherEntry("3des-ctr", 8, 24, "ch.ethz.ssh2.crypto.cipher.DESede"));
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45 ciphers.add(new CipherEntry("3des-cbc", 8, 24, "ch.ethz.ssh2.crypto.cipher.DESede"));
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46 }
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47
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48 public static String[] getDefaultCipherList() {
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49 List<String> list = new ArrayList<String>(ciphers.size());
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50
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51 for (CipherEntry ce : ciphers) {
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52 list.add(ce.type);
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53 }
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54
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55 return list.toArray(new String[ciphers.size()]);
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56 }
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57
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58 public static void checkCipherList(String[] cipherCandidates) {
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59 for (String cipherCandidate : cipherCandidates) {
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60 getEntry(cipherCandidate);
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61 }
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62 }
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63
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64 // @SuppressWarnings("rawtypes")
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65 public static BlockCipher createCipher(String type, boolean encrypt, byte[] key, byte[] iv) {
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66 try {
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67 CipherEntry ce = getEntry(type);
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68 Class<?> cc = Class.forName(ce.cipherClass);
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69 BlockCipher bc = (BlockCipher) cc.newInstance();
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70
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71 if (type.endsWith("-cbc")) {
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72 bc.init(encrypt, key);
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73 return new CBCMode(bc, iv, encrypt);
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74 }
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75 else if (type.endsWith("-ctr")) {
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76 bc.init(true, key);
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77 return new CTRMode(bc, iv, encrypt);
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78 }
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79
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80 throw new IllegalArgumentException("Cannot instantiate " + type);
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81 }
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82 catch (ClassNotFoundException e) {
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83 throw new IllegalArgumentException("Cannot instantiate " + type, e);
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84 }
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85 catch (InstantiationException e) {
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86 throw new IllegalArgumentException("Cannot instantiate " + type, e);
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87 }
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88 catch (IllegalAccessException e) {
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89 throw new IllegalArgumentException("Cannot instantiate " + type, e);
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90 }
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91 }
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92
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93 private static CipherEntry getEntry(String type) {
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94 for (CipherEntry ce : ciphers) {
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95 if (ce.type.equals(type)) {
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96 return ce;
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97 }
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98 }
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99
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100 throw new IllegalArgumentException("Unkown algorithm " + type);
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101 }
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102
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103 public static int getBlockSize(String type) {
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104 CipherEntry ce = getEntry(type);
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105 return ce.blocksize;
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106 }
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107
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108 public static int getKeySize(String type) {
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109 CipherEntry ce = getEntry(type);
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110 return ce.keysize;
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111 }
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112 }