|
0
|
1
|
|
|
2 package com.trilead.ssh2.crypto.cipher;
|
|
|
3
|
|
|
4 import java.util.Vector;
|
|
|
5
|
|
|
6 /**
|
|
|
7 * BlockCipherFactory.
|
|
|
8 *
|
|
|
9 * @author Christian Plattner, plattner@trilead.com
|
|
|
10 * @version $Id: BlockCipherFactory.java,v 1.2 2008/04/01 12:38:09 cplattne Exp $
|
|
|
11 */
|
|
|
12 public class BlockCipherFactory {
|
|
|
13 static class CipherEntry {
|
|
|
14 String type;
|
|
|
15 int blocksize;
|
|
|
16 int keysize;
|
|
|
17 String cipherClass;
|
|
|
18
|
|
|
19 public CipherEntry(String type, int blockSize, int keySize, String cipherClass) {
|
|
|
20 this.type = type;
|
|
|
21 this.blocksize = blockSize;
|
|
|
22 this.keysize = keySize;
|
|
|
23 this.cipherClass = cipherClass;
|
|
|
24 }
|
|
|
25 }
|
|
|
26
|
|
|
27 static Vector<CipherEntry> ciphers = new Vector<CipherEntry>();
|
|
|
28
|
|
|
29 static {
|
|
|
30 /* Higher Priority First */
|
|
|
31 ciphers.addElement(new CipherEntry("aes256-ctr", 16, 32, "com.trilead.ssh2.crypto.cipher.AES"));
|
|
|
32 ciphers.addElement(new CipherEntry("aes192-ctr", 16, 24, "com.trilead.ssh2.crypto.cipher.AES"));
|
|
|
33 ciphers.addElement(new CipherEntry("aes128-ctr", 16, 16, "com.trilead.ssh2.crypto.cipher.AES"));
|
|
|
34 ciphers.addElement(new CipherEntry("blowfish-ctr", 8, 16, "com.trilead.ssh2.crypto.cipher.BlowFish"));
|
|
|
35 ciphers.addElement(new CipherEntry("aes256-cbc", 16, 32, "com.trilead.ssh2.crypto.cipher.AES"));
|
|
|
36 ciphers.addElement(new CipherEntry("aes192-cbc", 16, 24, "com.trilead.ssh2.crypto.cipher.AES"));
|
|
|
37 ciphers.addElement(new CipherEntry("aes128-cbc", 16, 16, "com.trilead.ssh2.crypto.cipher.AES"));
|
|
|
38 ciphers.addElement(new CipherEntry("blowfish-cbc", 8, 16, "com.trilead.ssh2.crypto.cipher.BlowFish"));
|
|
|
39 ciphers.addElement(new CipherEntry("3des-ctr", 8, 24, "com.trilead.ssh2.crypto.cipher.DESede"));
|
|
|
40 ciphers.addElement(new CipherEntry("3des-cbc", 8, 24, "com.trilead.ssh2.crypto.cipher.DESede"));
|
|
|
41 }
|
|
|
42
|
|
|
43 public static String[] getDefaultCipherList() {
|
|
|
44 String list[] = new String[ciphers.size()];
|
|
|
45
|
|
|
46 for (int i = 0; i < ciphers.size(); i++) {
|
|
|
47 CipherEntry ce = ciphers.elementAt(i);
|
|
|
48 list[i] = new String(ce.type);
|
|
|
49 }
|
|
|
50
|
|
|
51 return list;
|
|
|
52 }
|
|
|
53
|
|
|
54 public static void checkCipherList(String[] cipherCandidates) {
|
|
|
55 for (int i = 0; i < cipherCandidates.length; i++)
|
|
|
56 getEntry(cipherCandidates[i]);
|
|
|
57 }
|
|
|
58
|
|
|
59 public static BlockCipher createCipher(String type, boolean encrypt, byte[] key, byte[] iv) {
|
|
|
60 try {
|
|
|
61 CipherEntry ce = getEntry(type);
|
|
|
62 Class cc = Class.forName(ce.cipherClass);
|
|
|
63 BlockCipher bc = (BlockCipher) cc.newInstance();
|
|
|
64
|
|
|
65 if (type.endsWith("-cbc")) {
|
|
|
66 bc.init(encrypt, key);
|
|
|
67 return new CBCMode(bc, iv, encrypt);
|
|
|
68 }
|
|
|
69 else if (type.endsWith("-ctr")) {
|
|
|
70 bc.init(true, key);
|
|
|
71 return new CTRMode(bc, iv, encrypt);
|
|
|
72 }
|
|
|
73
|
|
|
74 throw new IllegalArgumentException("Cannot instantiate " + type);
|
|
|
75 }
|
|
|
76 catch (Exception e) {
|
|
|
77 throw new IllegalArgumentException("Cannot instantiate " + type);
|
|
|
78 }
|
|
|
79 }
|
|
|
80
|
|
|
81 private static CipherEntry getEntry(String type) {
|
|
|
82 for (int i = 0; i < ciphers.size(); i++) {
|
|
|
83 CipherEntry ce = ciphers.elementAt(i);
|
|
|
84
|
|
|
85 if (ce.type.equals(type))
|
|
|
86 return ce;
|
|
|
87 }
|
|
|
88
|
|
|
89 throw new IllegalArgumentException("Unkown algorithm " + type);
|
|
|
90 }
|
|
|
91
|
|
|
92 public static int getBlockSize(String type) {
|
|
|
93 CipherEntry ce = getEntry(type);
|
|
|
94 return ce.blocksize;
|
|
|
95 }
|
|
|
96
|
|
|
97 public static int getKeySize(String type) {
|
|
|
98 CipherEntry ce = getEntry(type);
|
|
|
99 return ce.keysize;
|
|
|
100 }
|
|
|
101 }
|
