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annotate src/ch/ethz/ssh2/crypto/cipher/BlockCipherFactory.java @ 273:91a31873c42a ganymed

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author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 11:21:46 -0700
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children 071eccdff8ea
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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 {
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19 private static final class CipherEntry
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20 {
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21 String type;
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22 int blocksize;
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23 int keysize;
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24 String cipherClass;
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25
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26 public CipherEntry(String type, int blockSize, int keySize, String cipherClass)
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27 {
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28 this.type = type;
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29 this.blocksize = blockSize;
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30 this.keysize = keySize;
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31 this.cipherClass = cipherClass;
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32 }
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33 }
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34
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35 private static final List<CipherEntry> ciphers = new ArrayList<CipherEntry>();
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36
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37 static
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38 {
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39 /* Higher Priority First */
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40 ciphers.add(new CipherEntry("aes128-ctr", 16, 16, "ch.ethz.ssh2.crypto.cipher.AES"));
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41 ciphers.add(new CipherEntry("aes192-ctr", 16, 24, "ch.ethz.ssh2.crypto.cipher.AES"));
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42 ciphers.add(new CipherEntry("aes256-ctr", 16, 32, "ch.ethz.ssh2.crypto.cipher.AES"));
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43 ciphers.add(new CipherEntry("blowfish-ctr", 8, 16, "ch.ethz.ssh2.crypto.cipher.BlowFish"));
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44
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45 ciphers.add(new CipherEntry("aes128-cbc", 16, 16, "ch.ethz.ssh2.crypto.cipher.AES"));
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46 ciphers.add(new CipherEntry("aes192-cbc", 16, 24, "ch.ethz.ssh2.crypto.cipher.AES"));
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47 ciphers.add(new CipherEntry("aes256-cbc", 16, 32, "ch.ethz.ssh2.crypto.cipher.AES"));
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48 ciphers.add(new CipherEntry("blowfish-cbc", 8, 16, "ch.ethz.ssh2.crypto.cipher.BlowFish"));
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49
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50 ciphers.add(new CipherEntry("3des-ctr", 8, 24, "ch.ethz.ssh2.crypto.cipher.DESede"));
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51 ciphers.add(new CipherEntry("3des-cbc", 8, 24, "ch.ethz.ssh2.crypto.cipher.DESede"));
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52 }
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53
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54 public static String[] getDefaultCipherList()
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55 {
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56 List<String> list = new ArrayList<String>(ciphers.size());
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57 for (CipherEntry ce : ciphers)
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58 {
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59 list.add(ce.type);
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60 }
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61 return list.toArray(new String[ciphers.size()]);
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62 }
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63
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64 public static void checkCipherList(String[] cipherCandidates)
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65 {
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66 for (String cipherCandidate : cipherCandidates)
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67 {
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68 getEntry(cipherCandidate);
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69 }
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70 }
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71
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72 // @SuppressWarnings("rawtypes")
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73 public static BlockCipher createCipher(String type, boolean encrypt, byte[] key, byte[] iv)
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74 {
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75 try
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76 {
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77 CipherEntry ce = getEntry(type);
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78 Class<?> cc = Class.forName(ce.cipherClass);
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79 BlockCipher bc = (BlockCipher) cc.newInstance();
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80
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81 if (type.endsWith("-cbc"))
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82 {
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83 bc.init(encrypt, key);
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84 return new CBCMode(bc, iv, encrypt);
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85 }
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86 else if (type.endsWith("-ctr"))
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87 {
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88 bc.init(true, key);
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89 return new CTRMode(bc, iv, encrypt);
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90 }
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91 throw new IllegalArgumentException("Cannot instantiate " + type);
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92 }
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93 catch (ClassNotFoundException e)
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94 {
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95 throw new IllegalArgumentException("Cannot instantiate " + type, e);
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96 }
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97 catch (InstantiationException e)
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98 {
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99 throw new IllegalArgumentException("Cannot instantiate " + type, e);
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100 }
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101 catch (IllegalAccessException e)
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102 {
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103 throw new IllegalArgumentException("Cannot instantiate " + type, e);
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104 }
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105 }
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106
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107 private static CipherEntry getEntry(String type)
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108 {
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109 for (CipherEntry ce : ciphers)
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110 {
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111 if (ce.type.equals(type))
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112 {
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113 return ce;
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114 }
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115 }
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116 throw new IllegalArgumentException("Unkown algorithm " + type);
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117 }
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118
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119 public static int getBlockSize(String type)
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120 {
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121 CipherEntry ce = getEntry(type);
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122 return ce.blocksize;
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123 }
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124
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125 public static int getKeySize(String type)
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126 {
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127 CipherEntry ce = getEntry(type);
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128 return ce.keysize;
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129 }
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130 }