/eclipse_projects/PubkeyGenerator/src/com/trilead/ssh2/crypto/cipher/BlockCipherFactory.java
Java | 115 lines | 92 code | 16 blank | 7 comment | 7 complexity | c52e884231da2909bc420566dc344c49 MD5 | raw file
-
- package com.trilead.ssh2.crypto.cipher;
-
- import java.util.Vector;
-
- /**
- * BlockCipherFactory.
- *
- * @author Christian Plattner, plattner@trilead.com
- * @version $Id: BlockCipherFactory.java,v 1.2 2008/04/01 12:38:09 cplattne Exp $
- */
- public class BlockCipherFactory
- {
- static class CipherEntry
- {
- String type;
- int blocksize;
- int keysize;
- String cipherClass;
-
- public CipherEntry(String type, int blockSize, int keySize, String cipherClass)
- {
- this.type = type;
- this.blocksize = blockSize;
- this.keysize = keySize;
- this.cipherClass = cipherClass;
- }
- }
-
- static Vector<CipherEntry> ciphers = new Vector<CipherEntry>();
-
- static
- {
- /* Higher Priority First */
-
- ciphers.addElement(new CipherEntry("aes256-ctr", 16, 32, "com.trilead.ssh2.crypto.cipher.AES"));
- ciphers.addElement(new CipherEntry("aes192-ctr", 16, 24, "com.trilead.ssh2.crypto.cipher.AES"));
- ciphers.addElement(new CipherEntry("aes128-ctr", 16, 16, "com.trilead.ssh2.crypto.cipher.AES"));
- ciphers.addElement(new CipherEntry("blowfish-ctr", 8, 16, "com.trilead.ssh2.crypto.cipher.BlowFish"));
-
- ciphers.addElement(new CipherEntry("aes256-cbc", 16, 32, "com.trilead.ssh2.crypto.cipher.AES"));
- ciphers.addElement(new CipherEntry("aes192-cbc", 16, 24, "com.trilead.ssh2.crypto.cipher.AES"));
- ciphers.addElement(new CipherEntry("aes128-cbc", 16, 16, "com.trilead.ssh2.crypto.cipher.AES"));
- ciphers.addElement(new CipherEntry("blowfish-cbc", 8, 16, "com.trilead.ssh2.crypto.cipher.BlowFish"));
-
- ciphers.addElement(new CipherEntry("3des-ctr", 8, 24, "com.trilead.ssh2.crypto.cipher.DESede"));
- ciphers.addElement(new CipherEntry("3des-cbc", 8, 24, "com.trilead.ssh2.crypto.cipher.DESede"));
- }
-
- public static String[] getDefaultCipherList()
- {
- String list[] = new String[ciphers.size()];
- for (int i = 0; i < ciphers.size(); i++)
- {
- CipherEntry ce = ciphers.elementAt(i);
- list[i] = new String(ce.type);
- }
- return list;
- }
-
- public static void checkCipherList(String[] cipherCandidates)
- {
- for (int i = 0; i < cipherCandidates.length; i++)
- getEntry(cipherCandidates[i]);
- }
-
- public static BlockCipher createCipher(String type, boolean encrypt, byte[] key, byte[] iv)
- {
- try
- {
- CipherEntry ce = getEntry(type);
- Class cc = Class.forName(ce.cipherClass);
- BlockCipher bc = (BlockCipher) cc.newInstance();
-
- if (type.endsWith("-cbc"))
- {
- bc.init(encrypt, key);
- return new CBCMode(bc, iv, encrypt);
- }
- else if (type.endsWith("-ctr"))
- {
- bc.init(true, key);
- return new CTRMode(bc, iv, encrypt);
- }
- throw new IllegalArgumentException("Cannot instantiate " + type);
- }
- catch (Exception e)
- {
- throw new IllegalArgumentException("Cannot instantiate " + type);
- }
- }
-
- private static CipherEntry getEntry(String type)
- {
- for (int i = 0; i < ciphers.size(); i++)
- {
- CipherEntry ce = ciphers.elementAt(i);
- if (ce.type.equals(type))
- return ce;
- }
- throw new IllegalArgumentException("Unkown algorithm " + type);
- }
-
- public static int getBlockSize(String type)
- {
- CipherEntry ce = getEntry(type);
- return ce.blocksize;
- }
-
- public static int getKeySize(String type)
- {
- CipherEntry ce = getEntry(type);
- return ce.keysize;
- }
- }