diff options
Diffstat (limited to 'app/src/main/java/com/trilead/ssh2/crypto/cipher/DESede.java')
-rw-r--r-- | app/src/main/java/com/trilead/ssh2/crypto/cipher/DESede.java | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/app/src/main/java/com/trilead/ssh2/crypto/cipher/DESede.java b/app/src/main/java/com/trilead/ssh2/crypto/cipher/DESede.java new file mode 100644 index 0000000..f47a636 --- /dev/null +++ b/app/src/main/java/com/trilead/ssh2/crypto/cipher/DESede.java @@ -0,0 +1,105 @@ + +package com.trilead.ssh2.crypto.cipher; + +/* + This file was shamelessly taken (and modified) from the Bouncy Castle Crypto package. + Their licence file states the following: + + Copyright (c) 2000 - 2004 The Legion Of The Bouncy Castle + (http://www.bouncycastle.org) + + Permission is hereby granted, free of charge, to any person obtaining a copy + of this software and associated documentation files (the "Software"), to deal + in the Software without restriction, including without limitation the rights + to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + copies of the Software, and to permit persons to whom the Software is + furnished to do so, subject to the following conditions: + + The above copyright notice and this permission notice shall be included in + all copies or substantial portions of the Software. + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + THE SOFTWARE. + */ + +/** + * DESede. + * + * @author See comments in the source file + * @version $Id: DESede.java,v 1.1 2007/10/15 12:49:55 cplattne Exp $ + * + */ +public class DESede extends DES +{ + private int[] key1 = null; + private int[] key2 = null; + private int[] key3 = null; + + private boolean encrypt; + + /** + * standard constructor. + */ + public DESede() + { + } + + /** + * initialise a DES cipher. + * + * @param encrypting + * whether or not we are for encryption. + * @param key + * the parameters required to set up the cipher. + * @exception IllegalArgumentException + * if the params argument is inappropriate. + */ + public void init(boolean encrypting, byte[] key) + { + key1 = generateWorkingKey(encrypting, key, 0); + key2 = generateWorkingKey(!encrypting, key, 8); + key3 = generateWorkingKey(encrypting, key, 16); + + encrypt = encrypting; + } + + public String getAlgorithmName() + { + return "DESede"; + } + + public int getBlockSize() + { + return 8; + } + + public void transformBlock(byte[] in, int inOff, byte[] out, int outOff) + { + if (key1 == null) + { + throw new IllegalStateException("DESede engine not initialised!"); + } + + if (encrypt) + { + desFunc(key1, in, inOff, out, outOff); + desFunc(key2, out, outOff, out, outOff); + desFunc(key3, out, outOff, out, outOff); + } + else + { + desFunc(key3, in, inOff, out, outOff); + desFunc(key2, out, outOff, out, outOff); + desFunc(key1, out, outOff, out, outOff); + } + } + + public void reset() + { + } +} |