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Viewing changes to contrib/NSch/NSch.Jce/BlowfishCBC.cs

  • Committer: Bazaar Package Importer
  • Author(s): Jo Shields
  • Date: 2011-06-27 17:03:13 UTC
  • mto: (1.8.1 upstream)
  • mto: This revision was merged to the branch mainline in revision 54.
  • Revision ID: james.westby@ubuntu.com-20110627170313-6cvz3s19x6e9hqe9
Import upstream version 2.5.92+dfsg

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contrib/NSch/NSch.Jce/BlowfishCBC.cs
 
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/*
 
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Copyright (c) 2006-2010 ymnk, JCraft,Inc. All rights reserved.
 
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Redistribution and use in source and binary forms, with or without
 
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modification, are permitted provided that the following conditions are met:
 
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  1. Redistributions of source code must retain the above copyright notice,
 
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     this list of conditions and the following disclaimer.
 
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  2. Redistributions in binary form must reproduce the above copyright 
 
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     notice, this list of conditions and the following disclaimer in 
 
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     the documentation and/or other materials provided with the distribution.
 
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  3. The names of the authors may not be used to endorse or promote products
 
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     derived from this software without specific prior written permission.
 
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
 
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INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
 
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 
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OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
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This code is based on jsch (http://www.jcraft.com/jsch).
 
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All credit should go to the authors of jsch.
 
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*/
 
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using System;
 
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using NSch.Jce;
 
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using Sharpen;
 
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namespace NSch.Jce
 
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{
 
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        public class BlowfishCBC : NSch.Cipher
 
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        {
 
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                private const int ivsize = 8;
 
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                private const int bsize = 16;
 
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                private Sharpen.Cipher cipher;
 
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                public override int GetIVSize()
 
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                {
 
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                        return ivsize;
 
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                }
 
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                public override int GetBlockSize()
 
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                {
 
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                        return bsize;
 
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                }
 
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                /// <exception cref="System.Exception"></exception>
 
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                public override void Init(int mode, byte[] key, byte[] iv)
 
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                {
 
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                        string pad = "NoPadding";
 
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                        //  if(padding) pad="PKCS5Padding";
 
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                        byte[] tmp;
 
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                        if (iv.Length > ivsize)
 
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                        {
 
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                                tmp = new byte[ivsize];
 
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                                System.Array.Copy(iv, 0, tmp, 0, tmp.Length);
 
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                                iv = tmp;
 
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                        }
 
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                        if (key.Length > bsize)
 
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                        {
 
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                                tmp = new byte[bsize];
 
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                                System.Array.Copy(key, 0, tmp, 0, tmp.Length);
 
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                                key = tmp;
 
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                        }
 
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                        try
 
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                        {
 
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                                SecretKeySpec skeySpec = new SecretKeySpec(key, "Blowfish");
 
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                                cipher = Sharpen.Cipher.GetInstance("Blowfish/CBC/" + pad);
 
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                                cipher.Init((mode == ENCRYPT_MODE ? Sharpen.Cipher.ENCRYPT_MODE : Sharpen.Cipher.
 
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                                        DECRYPT_MODE), skeySpec, new IvParameterSpec(iv));
 
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                        }
 
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                        catch (Exception e)
 
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                        {
 
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                                throw;
 
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                        }
 
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                }
 
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                /// <exception cref="System.Exception"></exception>
 
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                public override void Update(byte[] foo, int s1, int len, byte[] bar, int s2)
 
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                {
 
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                        cipher.Update(foo, s1, len, bar, s2);
 
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                }
 
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                public override bool IsCBC()
 
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                {
 
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                        return true;
 
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                }
 
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        }
 
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}