Mercurial > 510Connectbot
view src/com/trilead/ssh2/crypto/cipher/BlockCipherFactory.java @ 114:5eda34fb607f
host editor database values override summary text only if non-empty
author | Carl Byington <carl@five-ten-sg.com> |
---|---|
date | Wed, 18 Jun 2014 14:34:02 -0700 |
parents | 0ce5cc452d02 |
children |
line wrap: on
line source
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; } }