view src/ch/ethz/ssh2/crypto/cipher/CTRMode.java @ 411:8bff0bfaec3a
wait for monitor socket to be created
author
Carl Byington <carl@five-ten-sg.com>
date
Fri, 24 Oct 2014 17:48:43 -0700 (2014-10-25)
parents
071eccdff8ea
children
line source
+ − /*
+ − * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
+ − * Please refer to the LICENSE.txt for licensing details.
+ − */
+ − package ch.ethz.ssh2.crypto.cipher;
+ −
+ − /**
+ − * This is CTR mode as described in draft-ietf-secsh-newmodes-XY.txt
+ − *
+ − * @author Christian Plattner
+ − * @version 2.50, 03/15/10
+ − */
+ − public class CTRMode implements BlockCipher {
+ − byte[] X;
+ − byte[] Xenc;
+ −
+ − BlockCipher bc;
+ − int blockSize;
+ − boolean doEncrypt;
+ −
+ − int count = 0;
+ −
+ − public void init(boolean forEncryption, byte[] key) {
+ − }
+ −
+ − public CTRMode(BlockCipher tc, byte[] iv, boolean doEnc) throws IllegalArgumentException {
+ − bc = tc;
+ − blockSize = bc.getBlockSize();
+ − doEncrypt = doEnc;
+ −
+ − if (blockSize != iv.length)
+ − throw new IllegalArgumentException("IV must be " + blockSize + " bytes long! (currently " + iv.length + ")");
+ −
+ − X = new byte[blockSize];
+ − Xenc = new byte[blockSize];
+ − System.arraycopy(iv, 0, X, 0, blockSize);
+ − }
+ −
+ − public final int getBlockSize() {
+ − return blockSize;
+ − }
+ −
+ − public final void transformBlock(byte[] src, int srcoff, byte[] dst, int dstoff) {
+ − bc.transformBlock(X, 0, Xenc, 0);
+ −
+ − for (int i = 0; i < blockSize; i++) {
+ − dst[dstoff + i] = (byte)(src[srcoff + i] ^ Xenc[i]);
+ − }
+ −
+ − for (int i = (blockSize - 1); i >= 0; i--) {
+ − X[i]++;
+ −
+ − if (X[i] != 0)
+ − break;
+ − }
+ − }
+ − }