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jeremybenn |
/* IBlockCipherSpi.java --
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Copyright (C) 2001, 2002, 2006 Free Software Foundation, Inc.
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This file is a part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.javax.crypto.cipher;
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import java.security.InvalidKeyException;
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import java.util.Iterator;
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/**
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* Package-private interface exposing mandatory methods to be implemented by
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* concrete {@link BaseCipher} sub-classes.
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*/
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interface IBlockCipherSpi
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extends Cloneable
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{
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/**
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* Returns an {@link Iterator} over the supported block sizes. Each element
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* returned by this object is a {@link java.lang.Integer}.
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*
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* @return an <code>Iterator</code> over the supported block sizes.
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*/
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Iterator blockSizes();
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/**
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* Returns an {@link Iterator} over the supported key sizes. Each element
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* returned by this object is a {@link java.lang.Integer}.
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*
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* @return an <code>Iterator</code> over the supported key sizes.
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*/
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Iterator keySizes();
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/**
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* Expands a user-supplied key material into a session key for a designated
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* <i>block size</i>.
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*
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* @param k the user-supplied key material.
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* @param bs the desired block size in bytes.
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* @return an Object encapsulating the session key.
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* @exception IllegalArgumentException if the block size is invalid.
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* @exception InvalidKeyException if the key data is invalid.
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*/
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Object makeKey(byte[] k, int bs) throws InvalidKeyException;
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/**
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* Encrypts exactly one block of plaintext.
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*
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* @param in the plaintext.
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* @param inOffset index of <code>in</code> from which to start considering
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* data.
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* @param out the ciphertext.
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* @param outOffset index of <code>out</code> from which to store the
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* result.
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* @param k the session key to use.
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* @param bs the block size to use.
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* @exception IllegalArgumentException if the block size is invalid.
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* @exception ArrayIndexOutOfBoundsException if there is not enough room in
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* either the plaintext or ciphertext buffers.
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*/
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void encrypt(byte[] in, int inOffset, byte[] out, int outOffset, Object k,
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int bs);
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/**
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* Decrypts exactly one block of ciphertext.
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*
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* @param in the ciphertext.
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* @param inOffset index of <code>in</code> from which to start considering
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* data.
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* @param out the plaintext.
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* @param outOffset index of <code>out</code> from which to store the
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* result.
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* @param k the session key to use.
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* @param bs the block size to use.
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* @exception IllegalArgumentException if the block size is invalid.
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* @exception ArrayIndexOutOfBoundsException if there is not enough room in
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* either the plaintext or ciphertext buffers.
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*/
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void decrypt(byte[] in, int inOffset, byte[] out, int outOffset, Object k,
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int bs);
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/**
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* A <i>correctness</i> test that consists of basic symmetric encryption /
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* decryption test(s) for all supported block and key sizes, as well as one
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* (1) variable key Known Answer Test (KAT).
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*
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* @return <code>true</code> if the implementation passes simple
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* <i>correctness</i> tests. Returns <code>false</code> otherwise.
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*/
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boolean selfTest();
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}
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