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

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start conversion from trilead to ganymed
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 11:21:46 -0700
parents
children 071eccdff8ea
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272:ce2f4e397703 273:91a31873c42a
1 /*
2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
3 * Please refer to the LICENSE.txt for licensing details.
4 */
5 package ch.ethz.ssh2.crypto.cipher;
6
7 import java.util.ArrayList;
8 import java.util.List;
9 import java.util.Vector;
10
11 /**
12 * BlockCipherFactory.
13 *
14 * @author Christian Plattner
15 * @version $Id: BlockCipherFactory.java 86 2014-04-07 14:15:18Z dkocher@sudo.ch $
16 */
17 public class BlockCipherFactory
18 {
19 private static final class CipherEntry
20 {
21 String type;
22 int blocksize;
23 int keysize;
24 String cipherClass;
25
26 public CipherEntry(String type, int blockSize, int keySize, String cipherClass)
27 {
28 this.type = type;
29 this.blocksize = blockSize;
30 this.keysize = keySize;
31 this.cipherClass = cipherClass;
32 }
33 }
34
35 private static final List<CipherEntry> ciphers = new ArrayList<CipherEntry>();
36
37 static
38 {
39 /* Higher Priority First */
40 ciphers.add(new CipherEntry("aes128-ctr", 16, 16, "ch.ethz.ssh2.crypto.cipher.AES"));
41 ciphers.add(new CipherEntry("aes192-ctr", 16, 24, "ch.ethz.ssh2.crypto.cipher.AES"));
42 ciphers.add(new CipherEntry("aes256-ctr", 16, 32, "ch.ethz.ssh2.crypto.cipher.AES"));
43 ciphers.add(new CipherEntry("blowfish-ctr", 8, 16, "ch.ethz.ssh2.crypto.cipher.BlowFish"));
44
45 ciphers.add(new CipherEntry("aes128-cbc", 16, 16, "ch.ethz.ssh2.crypto.cipher.AES"));
46 ciphers.add(new CipherEntry("aes192-cbc", 16, 24, "ch.ethz.ssh2.crypto.cipher.AES"));
47 ciphers.add(new CipherEntry("aes256-cbc", 16, 32, "ch.ethz.ssh2.crypto.cipher.AES"));
48 ciphers.add(new CipherEntry("blowfish-cbc", 8, 16, "ch.ethz.ssh2.crypto.cipher.BlowFish"));
49
50 ciphers.add(new CipherEntry("3des-ctr", 8, 24, "ch.ethz.ssh2.crypto.cipher.DESede"));
51 ciphers.add(new CipherEntry("3des-cbc", 8, 24, "ch.ethz.ssh2.crypto.cipher.DESede"));
52 }
53
54 public static String[] getDefaultCipherList()
55 {
56 List<String> list = new ArrayList<String>(ciphers.size());
57 for (CipherEntry ce : ciphers)
58 {
59 list.add(ce.type);
60 }
61 return list.toArray(new String[ciphers.size()]);
62 }
63
64 public static void checkCipherList(String[] cipherCandidates)
65 {
66 for (String cipherCandidate : cipherCandidates)
67 {
68 getEntry(cipherCandidate);
69 }
70 }
71
72 // @SuppressWarnings("rawtypes")
73 public static BlockCipher createCipher(String type, boolean encrypt, byte[] key, byte[] iv)
74 {
75 try
76 {
77 CipherEntry ce = getEntry(type);
78 Class<?> cc = Class.forName(ce.cipherClass);
79 BlockCipher bc = (BlockCipher) cc.newInstance();
80
81 if (type.endsWith("-cbc"))
82 {
83 bc.init(encrypt, key);
84 return new CBCMode(bc, iv, encrypt);
85 }
86 else if (type.endsWith("-ctr"))
87 {
88 bc.init(true, key);
89 return new CTRMode(bc, iv, encrypt);
90 }
91 throw new IllegalArgumentException("Cannot instantiate " + type);
92 }
93 catch (ClassNotFoundException e)
94 {
95 throw new IllegalArgumentException("Cannot instantiate " + type, e);
96 }
97 catch (InstantiationException e)
98 {
99 throw new IllegalArgumentException("Cannot instantiate " + type, e);
100 }
101 catch (IllegalAccessException e)
102 {
103 throw new IllegalArgumentException("Cannot instantiate " + type, e);
104 }
105 }
106
107 private static CipherEntry getEntry(String type)
108 {
109 for (CipherEntry ce : ciphers)
110 {
111 if (ce.type.equals(type))
112 {
113 return ce;
114 }
115 }
116 throw new IllegalArgumentException("Unkown algorithm " + type);
117 }
118
119 public static int getBlockSize(String type)
120 {
121 CipherEntry ce = getEntry(type);
122 return ce.blocksize;
123 }
124
125 public static int getKeySize(String type)
126 {
127 CipherEntry ce = getEntry(type);
128 return ce.keysize;
129 }
130 }