gcc/libjava/classpath/gnu/javax/crypto/jce/spec/BlockCipherParameterSpec.java

/* BlockCipherParameterSpec.java -- 
   Copyright (C) 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
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General Public License for more details.

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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
USA

Linking this library statically or dynamically with other modules is
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permission to link this library with independent modules to produce an
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package gnu.javax.crypto.jce.spec;

import gnu.java.security.util.Util;

import java.security.spec.AlgorithmParameterSpec;

/**
 * Block cipher parameters in GNU Crypto are the cipher's name, its block
 * and key sizes, and an optional initialization vector.
 */
public class BlockCipherParameterSpec implements AlgorithmParameterSpec
{

  // Constants and variables.
  // -----------------------------------------------------------------------

  /**
   * The initialization vector.
   */
  protected byte[] iv;

  /**
   * The cipher's block size, in bytes.
   */
  protected int blockSize;

  /**
   * The cipher's key size, in bytes.
   */
  protected int keySize;

  // Constructors.
  // -----------------------------------------------------------------------

  /**
   * Create a new parameter specification.
   *
   * @param iv        The initialization vector, or <code>null</code> if
   *                  there is no IV.
   * @param blockSize The cipher's block size, in bytes.
   * @param keySize   The cipher's key size, in bytes.
   */
  public BlockCipherParameterSpec(byte[] iv, int blockSize, int keySize)
  {
    this.iv = (iv != null) ? (byte[]) iv.clone() : null;
    this.blockSize = blockSize;
    this.keySize = keySize;
  }

  /**
   * Create a new parameter specification with no IV.
   *
   * @param blockSize The cipher's block size, in bytes.
   * @param keySize   The cipher's key size, in bytes.
   */
  public BlockCipherParameterSpec(int blockSize, int keySize)
  {
    this(null, blockSize, keySize);
  }

  // Instance methods.
  // -----------------------------------------------------------------------

  /**
   * Get the initialization vector for the cipher, or <code>null</code>
   * if there is no IV.
   *
   * @return The IV.
   */
  public byte[] getIV()
  {
    return iv;
  }

  /**
   * Get the block size of the cipher these parameters are for.
   *
   * @return The block size.
   */
  public int getBlockSize()
  {
    return blockSize;
  }

  /**
   * Get the key size of the cipher these parameters are for.
   *
   * @return The block size.
   */
  public int getKeySize()
  {
    return keySize;
  }

  public String toString()
  {
    return getClass().getName() + " { "
           + ((iv != null) ? ("IV=" + Util.toString(iv)) + ", " : "") + "BS="
           + blockSize + ", KS=" + keySize + " }";
  }
}