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/* IBlockCipherSpi.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.cipher;
 
import java.security.InvalidKeyException;
import java.util.Iterator;
 
/**
 * Package-private interface exposing mandatory methods to be implemented by
 * concrete {@link BaseCipher} sub-classes.
 */
interface IBlockCipherSpi
    extends Cloneable
{
  /**
   * Returns an {@link Iterator} over the supported block sizes. Each element
   * returned by this object is a {@link java.lang.Integer}.
   *
   * @return an <code>Iterator</code> over the supported block sizes.
   */
  Iterator blockSizes();
 
  /**
   * Returns an {@link Iterator} over the supported key sizes. Each element
   * returned by this object is a {@link java.lang.Integer}.
   *
   * @return an <code>Iterator</code> over the supported key sizes.
   */
  Iterator keySizes();
 
  /**
   * Expands a user-supplied key material into a session key for a designated
   * <i>block size</i>.
   *
   * @param k the user-supplied key material.
   * @param bs the desired block size in bytes.
   * @return an Object encapsulating the session key.
   * @exception IllegalArgumentException if the block size is invalid.
   * @exception InvalidKeyException if the key data is invalid.
   */
  Object makeKey(byte[] k, int bs) throws InvalidKeyException;
 
  /**
   * Encrypts exactly one block of plaintext.
   *
   * @param in the plaintext.
   * @param inOffset index of <code>in</code> from which to start considering
   *          data.
   * @param out the ciphertext.
   * @param outOffset index of <code>out</code> from which to store the
   *          result.
   * @param k the session key to use.
   * @param bs the block size to use.
   * @exception IllegalArgumentException if the block size is invalid.
   * @exception ArrayIndexOutOfBoundsException if there is not enough room in
   *              either the plaintext or ciphertext buffers.
   */
  void encrypt(byte[] in, int inOffset, byte[] out, int outOffset, Object k,
               int bs);
 
  /**
   * Decrypts exactly one block of ciphertext.
   *
   * @param in the ciphertext.
   * @param inOffset index of <code>in</code> from which to start considering
   *          data.
   * @param out the plaintext.
   * @param outOffset index of <code>out</code> from which to store the
   *          result.
   * @param k the session key to use.
   * @param bs the block size to use.
   * @exception IllegalArgumentException if the block size is invalid.
   * @exception ArrayIndexOutOfBoundsException if there is not enough room in
   *              either the plaintext or ciphertext buffers.
   */
  void decrypt(byte[] in, int inOffset, byte[] out, int outOffset, Object k,
               int bs);
 
  /**
   * A <i>correctness</i> test that consists of basic symmetric encryption /
   * decryption test(s) for all supported block and key sizes, as well as one
   * (1) variable key Known Answer Test (KAT).
   *
   * @return <code>true</code> if the implementation passes simple
   *         <i>correctness</i> tests. Returns <code>false</code> otherwise.
   */
  boolean selfTest();
}