| /* ECB.java -- |
| Copyright (C) 2001, 2002, 2006 Free Software Foundation, Inc. |
| |
| This file is a part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or (at |
| your option) any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 |
| USA |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.javax.crypto.mode; |
| |
| import gnu.java.security.Registry; |
| import gnu.javax.crypto.cipher.IBlockCipher; |
| |
| /** |
| * The implementation of the Electronic Codebook mode. |
| * <p> |
| * The Electronic Codebook (ECB) mode is a confidentiality mode that is defined |
| * as follows: |
| * <ul> |
| * <li>ECB Encryption: C<sub>j</sub> = CIPH<sub>K</sub>(P<sub>j</sub>) |
| * for j = 1...n</li> |
| * <li>ECB Decryption: P<sub>j</sub> = CIPH<sup>-1</sup><sub>K</sub>(C<sub>j</sub>) |
| * for j = 1...n</li> |
| * </ul> |
| * <p> |
| * In ECB encryption, the forward cipher function is applied directly, and |
| * independently, to each block of the plaintext. The resulting sequence of |
| * output blocks is the ciphertext. |
| * <p> |
| * In ECB decryption, the inverse cipher function is applied directly, and |
| * independently, to each block of the ciphertext. The resulting sequence of |
| * output blocks is the plaintext. |
| * <p> |
| * References: |
| * <ol> |
| * <li><a |
| * href="http://csrc.nist.gov/encryption/modes/Recommendation/Modes01.pdf"> |
| * Recommendation for Block Cipher Modes of Operation Methods and Techniques</a>, |
| * Morris Dworkin.</li> |
| * </ol> |
| */ |
| public class ECB |
| extends BaseMode |
| implements Cloneable |
| { |
| /** |
| * Trivial package-private constructor for use by the Factory class. |
| * |
| * @param underlyingCipher the underlying cipher implementation. |
| * @param cipherBlockSize the underlying cipher block size to use. |
| */ |
| ECB(IBlockCipher underlyingCipher, int cipherBlockSize) |
| { |
| super(Registry.ECB_MODE, underlyingCipher, cipherBlockSize); |
| } |
| |
| /** |
| * Private constructor for cloning purposes. |
| * |
| * @param that the mode to clone. |
| */ |
| private ECB(ECB that) |
| { |
| this((IBlockCipher) that.cipher.clone(), that.cipherBlockSize); |
| } |
| |
| public Object clone() |
| { |
| return new ECB(this); |
| } |
| |
| public void setup() |
| { |
| if (modeBlockSize != cipherBlockSize) |
| throw new IllegalArgumentException(IMode.MODE_BLOCK_SIZE); |
| } |
| |
| public void teardown() |
| { |
| } |
| |
| public void encryptBlock(byte[] in, int i, byte[] out, int o) |
| { |
| cipher.encryptBlock(in, i, out, o); |
| } |
| |
| public void decryptBlock(byte[] in, int i, byte[] out, int o) |
| { |
| cipher.decryptBlock(in, i, out, o); |
| } |
| } |