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Java > Open Source Codes > Acme > Crypto > BlockCipher


1 // BlockCipher - a block encryption template
2 //
3 // Copyright (C) 1996 by Jef Poskanzer <jef@acme.com>. All rights reserved.
4 //
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions
7 // are met:
8 // 1. Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 // 2. Redistributions in binary form must reproduce the above copyright
11 // notice, this list of conditions and the following disclaimer in the
12 // documentation and/or other materials provided with the distribution.
13 //
14 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 // ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 // OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 // SUCH DAMAGE.
25 //
26 // Visit the ACME Labs Java page for up-to-date versions of this and other
27 // fine Java utilities: http://www.acme.com/java/
28
29 package Acme.Crypto;
30
31 import java.io.*;
32
33 /// A block encryption template.
34 // <P>
35 // <A HREF="../../../resources/classes/Acme/Crypto/BlockCipher.java">Fetch the software.</A><BR>
36 // <A HREF="../../../resources/classes/Acme.tar.gz">Fetch the entire Acme package.</A>
37 // <P>
38 // @see Cipher
39 // @see StreamCipher
40 // @see EncryptedOutputStream
41 // @see EncryptedInputStream
42 // @see DesCipher
43 // @see CbcBlockCipher
44
45 public abstract class BlockCipher extends Cipher
46     {
47
48     /// Constructor.
49 public BlockCipher( int keySize, int blockSize )
50     {
51     super( keySize );
52     this.blockSize = blockSize;
53     }
54
55     /// How big a block is.
56 public int blockSize;
57
58     /// Return how big a block is.
59 public int blockSize()
60     {
61     return blockSize;
62     }
63
64     /// Encrypt a block of bytes.
65 public abstract void encrypt( byte[] clearText, int clearOff, byte[] cipherText, int cipherOff );
66
67     /// Decrypt a block of bytes.
68 public abstract void decrypt( byte[] cipherText, int cipherOff, byte[] clearText, int clearOff );
69
70     /// Encrypt a block of bytes.
71 public void encrypt( byte[] clearText, byte[] cipherText )
72     {
73     encrypt( clearText, 0, cipherText, 0 );
74     }
75
76     /// Decrypt a block of bytes.
77 public void decrypt( byte[] cipherText, byte[] clearText )
78     {
79     decrypt( cipherText, 0, clearText, 0 );
80     }
81
82     }
83
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