TripleDESCBC.java

/*
 * Copyright (c) 2002-2018 ymnk, JCraft,Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided with
 * the distribution.
 *
 * 3. The names of the authors may not be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL JCRAFT, INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jcraft.jsch.jce;

import com.jcraft.jsch.Cipher;
import javax.crypto.*;
import javax.crypto.spec.*;

public class TripleDESCBC implements Cipher {
  private static final int ivsize = 8;
  private static final int bsize = 24;
  private javax.crypto.Cipher cipher;

  @Override
  public int getIVSize() {
    return ivsize;
  }

  @Override
  public int getBlockSize() {
    return bsize;
  }

  @Override
  public void init(int mode, byte[] key, byte[] iv) throws Exception {
    String pad = "NoPadding";
    // if(padding) pad="PKCS5Padding";
    byte[] tmp;
    if (iv.length > ivsize) {
      tmp = new byte[ivsize];
      System.arraycopy(iv, 0, tmp, 0, tmp.length);
      iv = tmp;
    }
    if (key.length > bsize) {
      tmp = new byte[bsize];
      System.arraycopy(key, 0, tmp, 0, tmp.length);
      key = tmp;
    }

    try {
      cipher = javax.crypto.Cipher.getInstance("DESede/CBC/" + pad);
      /*
       * // The following code does not work on IBM's JDK 1.4.1 SecretKeySpec skeySpec = new
       * SecretKeySpec(key, "DESede"); cipher.init((mode==ENCRYPT_MODE?
       * javax.crypto.Cipher.ENCRYPT_MODE: javax.crypto.Cipher.DECRYPT_MODE), skeySpec, new
       * IvParameterSpec(iv));
       */
      DESedeKeySpec keyspec = new DESedeKeySpec(key);
      SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("DESede");
      SecretKey _key = keyfactory.generateSecret(keyspec);
      cipher.init((mode == ENCRYPT_MODE ? javax.crypto.Cipher.ENCRYPT_MODE
          : javax.crypto.Cipher.DECRYPT_MODE), _key, new IvParameterSpec(iv));
    } catch (Exception e) {
      cipher = null;
      throw e;
    }
  }

  @Override
  public void update(byte[] foo, int s1, int len, byte[] bar, int s2) throws Exception {
    cipher.update(foo, s1, len, bar, s2);
  }

  @Override
  public boolean isCBC() {
    return true;
  }
}