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BlockCipher.java

00001 // BlockCipher - a block encryption template
00002 //
00003 // Copyright (C) 1996 by Jef Poskanzer <jef@acme.com>.  All rights reserved.
00004 //
00005 // Redistribution and use in source and binary forms, with or without
00006 // modification, are permitted provided that the following conditions
00007 // are met:
00008 // 1. Redistributions of source code must retain the above copyright
00009 //    notice, this list of conditions and the following disclaimer.
00010 // 2. Redistributions in binary form must reproduce the above copyright
00011 //    notice, this list of conditions and the following disclaimer in the
00012 //    documentation and/or other materials provided with the distribution.
00013 //
00014 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
00015 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00016 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00017 // ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
00018 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00019 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00020 // OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00021 // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00022 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00023 // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00024 // SUCH DAMAGE.
00025 //
00026 // Visit the ACME Labs Java page for up-to-date versions of this and other
00027 // fine Java utilities: http://www.acme.com/java/
00028 
00029 package Acme.Crypto;
00030 
00031 import java.io.*;
00032 
00034 // <P>
00035 // <A HREF="/resources/classes/Acme/Crypto/BlockCipher.java">Fetch the software.</A><BR>
00036 // <A HREF="/resources/classes/Acme.tar.gz">Fetch the entire Acme package.</A>
00037 // <P>
00038 // @see Cipher
00039 // @see StreamCipher
00040 // @see EncryptedOutputStream
00041 // @see EncryptedInputStream
00042 // @see DesCipher
00043 // @see CbcBlockCipher
00044 
00045 public abstract class BlockCipher extends Cipher
00046     {
00047 
00049     public BlockCipher( int keySize, int blockSize )
00050         {
00051         super( keySize );
00052         this.blockSize = blockSize;
00053         }
00054 
00056     public int blockSize;
00057 
00059     public int blockSize()
00060         {
00061         return blockSize;
00062         }
00063 
00065     public abstract void encrypt( byte[] clearText, int clearOff, byte[] cipherText, int cipherOff );
00066 
00068     public abstract void decrypt( byte[] cipherText, int cipherOff, byte[] clearText, int clearOff );
00069 
00071     public void encrypt( byte[] clearText, byte[] cipherText )
00072         {
00073         encrypt( clearText, 0, cipherText, 0 );
00074         }
00075 
00077     public void decrypt( byte[] cipherText, byte[] clearText )
00078         {
00079         decrypt( cipherText, 0, clearText, 0 );
00080         }
00081 
00082     }

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