llvm-gcc-4.2/libjava/classpath/gnu/javax/crypto/mode/BaseMode.java - llvm-archive - Git at Google

 /* BaseMode.java --
    Copyright (C) 2001, 2002, 2003, 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.javax.crypto.cipher.IBlockCipher;

 import java.security.InvalidKeyException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;

 /**
  * A basic abstract class to facilitate implementing block cipher modes of
  * operations.
  */
 public abstract class BaseMode
     implements IMode
 {
   /** The canonical name prefix of this mode. */
   protected String name;
   /** The state indicator of this instance. */
   protected int state;
   /** The underlying block cipher implementation. */
   protected IBlockCipher cipher;
   /** The block size, in bytes, to operate the underlying block cipher in. */
   protected int cipherBlockSize;
   /** The block size, in bytes, in which to operate the mode instance. */
   protected int modeBlockSize;
   /** The initialisation vector value. */
   protected byte[] iv;
   /** The instance lock. */
   protected Object lock = new Object();

   /**
    * Trivial constructor for use by concrete subclasses.
    *
    * @param name the canonical name prefix of this mode.
    * @param underlyingCipher the implementation of the underlying cipher.
    * @param cipherBlockSize the block size, in bytes, in which to operate the
    *          underlying cipher.
    */
   protected BaseMode(String name, IBlockCipher underlyingCipher,
                      int cipherBlockSize)
   {
     super();

     this.name = name;
     this.cipher = underlyingCipher;
     this.cipherBlockSize = cipherBlockSize;
     state = -1;
   }

   public void update(byte[] in, int inOffset, byte[] out, int outOffset)
       throws IllegalStateException
   {
     synchronized (lock)
       {
         switch (state)
           {
           case ENCRYPTION:
             encryptBlock(in, inOffset, out, outOffset);
             break;
           case DECRYPTION:
             decryptBlock(in, inOffset, out, outOffset);
             break;
           default:
             throw new IllegalStateException();
           }
       }
   }

   public String name()
   {
     return new StringBuffer(name).append('(').append(cipher.name()).append(')')
         .toString();
   }

   /**
    * Returns the default value, in bytes, of the mode's block size. This value
    * is part of the construction arguments passed to the Factory methods in
    * {@link ModeFactory}. Unless changed by an invocation of any of the
    * <code>init()</code> methods, a <i>Mode</i> instance would operate with
    * the same block size as its underlying block cipher. As mentioned earlier,
    * the block size of the underlying block cipher itself is specified in one of
    * the method(s) available in the factory class.
    *
    * @return the default value, in bytes, of the mode's block size.
    * @see ModeFactory
    */
   public int defaultBlockSize()
   {
     return cipherBlockSize;
   }

   /**
    * Returns the default value, in bytes, of the underlying block cipher key
    * size.
    *
    * @return the default value, in bytes, of the underlying cipher's key size.
    */
   public int defaultKeySize()
   {
     return cipher.defaultKeySize();
   }

   /**
    * Returns an {@link Iterator} over the supported block sizes. Each element
    * returned by this object is an {@link Integer}.
    * <p>
    * The default behaviour is to return an iterator with just one value, which
    * is that currently configured for the underlying block cipher. Concrete
    * implementations may override this behaviour to signal their ability to
    * support other values.
    *
    * @return an {@link Iterator} over the supported block sizes.
    */
   public Iterator blockSizes()
   {
     ArrayList al = new ArrayList();
     al.add(Integer.valueOf(cipherBlockSize));
     return Collections.unmodifiableList(al).iterator();
   }

   /**
    * Returns an {@link Iterator} over the supported underlying block cipher key
    * sizes. Each element returned by this object is an instance of
    * {@link Integer}.
    *
    * @return an {@link Iterator} over the supported key sizes.
    */
   public Iterator keySizes()
   {
     return cipher.keySizes();
   }

   public void init(Map attributes) throws InvalidKeyException,
       IllegalStateException
   {
     synchronized (lock)
       {
         if (state != -1)
           throw new IllegalStateException();
         Integer want = (Integer) attributes.get(STATE);
         if (want != null)
           {
             switch (want.intValue())
               {
               case ENCRYPTION:
                 state = ENCRYPTION;
                 break;
               case DECRYPTION:
                 state = DECRYPTION;
                 break;
               default:
                 throw new IllegalArgumentException();
               }
           }
         Integer bs = (Integer) attributes.get(MODE_BLOCK_SIZE);
         modeBlockSize = (bs == null ? cipherBlockSize : bs.intValue());
         byte[] iv = (byte[]) attributes.get(IV);
         if (iv != null)
           this.iv = (byte[]) iv.clone();
         else
           this.iv = new byte[modeBlockSize];
         cipher.init(attributes);
         setup();
       }
   }

   public int currentBlockSize()
   {
     if (state == -1)
       throw new IllegalStateException();
     return modeBlockSize;
   }

   public void reset()
   {
     synchronized (lock)
       {
         state = -1;
         iv = null;
         cipher.reset();
         teardown();
       }
   }

   public boolean selfTest()
   {
     int ks;
     Iterator bit;
     for (Iterator kit = keySizes(); kit.hasNext();)
       {
         ks = ((Integer) kit.next()).intValue();
         for (bit = blockSizes(); bit.hasNext();)
           if (! testSymmetry(ks, ((Integer) bit.next()).intValue()))
             return false;
       }
     return true;
   }

   public abstract Object clone();

   /** The initialisation phase of the concrete mode implementation. */
   public abstract void setup();

   /** The termination phase of the concrete mode implementation. */
   public abstract void teardown();

   public abstract void encryptBlock(byte[] in, int i, byte[] out, int o);

   public abstract void decryptBlock(byte[] in, int i, byte[] out, int o);

   private boolean testSymmetry(int ks, int bs)
   {
     try
       {
         IMode mode = (IMode) this.clone();
         byte[] iv = new byte[cipherBlockSize]; // all zeroes
         byte[] k = new byte[ks];
         int i;
         for (i = 0; i < ks; i++)
           k[i] = (byte) i;
         int blockCount = 5;
         int limit = blockCount * bs;
         byte[] pt = new byte[limit];
         for (i = 0; i < limit; i++)
           pt[i] = (byte) i;
         byte[] ct = new byte[limit];
         byte[] cpt = new byte[limit];
         Map map = new HashMap();
         map.put(KEY_MATERIAL, k);
         map.put(CIPHER_BLOCK_SIZE, Integer.valueOf(cipherBlockSize));
         map.put(STATE, Integer.valueOf(ENCRYPTION));
         map.put(IV, iv);
         map.put(MODE_BLOCK_SIZE, Integer.valueOf(bs));
         mode.reset();
         mode.init(map);
         for (i = 0; i < blockCount; i++)
           mode.update(pt, i * bs, ct, i * bs);
         mode.reset();
         map.put(STATE, Integer.valueOf(DECRYPTION));
         mode.init(map);
         for (i = 0; i < blockCount; i++)
           mode.update(ct, i * bs, cpt, i * bs);
         return Arrays.equals(pt, cpt);
       }
     catch (Exception x)
       {
         x.printStackTrace(System.err);
         return false;
       }
   }
 }
	/* BaseMode.java --
	Copyright (C) 2001, 2002, 2003, 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.javax.crypto.cipher.IBlockCipher;

	import java.security.InvalidKeyException;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collections;
	import java.util.HashMap;
	import java.util.Iterator;
	import java.util.Map;

	/**
	* A basic abstract class to facilitate implementing block cipher modes of
	* operations.
	*/
	public abstract class BaseMode
	implements IMode
	{
	/** The canonical name prefix of this mode. */
	protected String name;
	/** The state indicator of this instance. */
	protected int state;
	/** The underlying block cipher implementation. */
	protected IBlockCipher cipher;
	/** The block size, in bytes, to operate the underlying block cipher in. */
	protected int cipherBlockSize;
	/** The block size, in bytes, in which to operate the mode instance. */
	protected int modeBlockSize;
	/** The initialisation vector value. */
	protected byte[] iv;
	/** The instance lock. */
	protected Object lock = new Object();

	/**
	* Trivial constructor for use by concrete subclasses.
	*
	* @param name the canonical name prefix of this mode.
	* @param underlyingCipher the implementation of the underlying cipher.
	* @param cipherBlockSize the block size, in bytes, in which to operate the
	* underlying cipher.
	*/
	protected BaseMode(String name, IBlockCipher underlyingCipher,
	int cipherBlockSize)
	{
	super();

	this.name = name;
	this.cipher = underlyingCipher;
	this.cipherBlockSize = cipherBlockSize;
	state = -1;
	}

	public void update(byte[] in, int inOffset, byte[] out, int outOffset)
	throws IllegalStateException
	{
	synchronized (lock)
	{
	switch (state)
	{
	case ENCRYPTION:
	encryptBlock(in, inOffset, out, outOffset);
	break;
	case DECRYPTION:
	decryptBlock(in, inOffset, out, outOffset);
	break;
	default:
	throw new IllegalStateException();
	}
	}
	}

	public String name()
	{
	return new StringBuffer(name).append('(').append(cipher.name()).append(')')
	.toString();
	}

	/**
	* Returns the default value, in bytes, of the mode's block size. This value
	* is part of the construction arguments passed to the Factory methods in
	* {@link ModeFactory}. Unless changed by an invocation of any of the
	* <code>init()</code> methods, a <i>Mode</i> instance would operate with
	* the same block size as its underlying block cipher. As mentioned earlier,
	* the block size of the underlying block cipher itself is specified in one of
	* the method(s) available in the factory class.
	*
	* @return the default value, in bytes, of the mode's block size.
	* @see ModeFactory
	*/
	public int defaultBlockSize()
	{
	return cipherBlockSize;
	}

	/**
	* Returns the default value, in bytes, of the underlying block cipher key
	* size.
	*
	* @return the default value, in bytes, of the underlying cipher's key size.
	*/
	public int defaultKeySize()
	{
	return cipher.defaultKeySize();
	}

	/**
	* Returns an {@link Iterator} over the supported block sizes. Each element
	* returned by this object is an {@link Integer}.
	* <p>
	* The default behaviour is to return an iterator with just one value, which
	* is that currently configured for the underlying block cipher. Concrete
	* implementations may override this behaviour to signal their ability to
	* support other values.
	*
	* @return an {@link Iterator} over the supported block sizes.
	*/
	public Iterator blockSizes()
	{
	ArrayList al = new ArrayList();
	al.add(Integer.valueOf(cipherBlockSize));
	return Collections.unmodifiableList(al).iterator();
	}

	/**
	* Returns an {@link Iterator} over the supported underlying block cipher key
	* sizes. Each element returned by this object is an instance of
	* {@link Integer}.
	*
	* @return an {@link Iterator} over the supported key sizes.
	*/
	public Iterator keySizes()
	{
	return cipher.keySizes();
	}

	public void init(Map attributes) throws InvalidKeyException,
	IllegalStateException
	{
	synchronized (lock)
	{
	if (state != -1)
	throw new IllegalStateException();
	Integer want = (Integer) attributes.get(STATE);
	if (want != null)
	{
	switch (want.intValue())
	{
	case ENCRYPTION:
	state = ENCRYPTION;
	break;
	case DECRYPTION:
	state = DECRYPTION;
	break;
	default:
	throw new IllegalArgumentException();
	}
	}
	Integer bs = (Integer) attributes.get(MODE_BLOCK_SIZE);
	modeBlockSize = (bs == null ? cipherBlockSize : bs.intValue());
	byte[] iv = (byte[]) attributes.get(IV);
	if (iv != null)
	this.iv = (byte[]) iv.clone();
	else
	this.iv = new byte[modeBlockSize];
	cipher.init(attributes);
	setup();
	}
	}

	public int currentBlockSize()
	{
	if (state == -1)
	throw new IllegalStateException();
	return modeBlockSize;
	}

	public void reset()
	{
	synchronized (lock)
	{
	state = -1;
	iv = null;
	cipher.reset();
	teardown();
	}
	}

	public boolean selfTest()
	{
	int ks;
	Iterator bit;
	for (Iterator kit = keySizes(); kit.hasNext();)
	{
	ks = ((Integer) kit.next()).intValue();
	for (bit = blockSizes(); bit.hasNext();)
	if (! testSymmetry(ks, ((Integer) bit.next()).intValue()))
	return false;
	}
	return true;
	}

	public abstract Object clone();

	/** The initialisation phase of the concrete mode implementation. */
	public abstract void setup();

	/** The termination phase of the concrete mode implementation. */
	public abstract void teardown();

	public abstract void encryptBlock(byte[] in, int i, byte[] out, int o);

	public abstract void decryptBlock(byte[] in, int i, byte[] out, int o);

	private boolean testSymmetry(int ks, int bs)
	{
	try
	{
	IMode mode = (IMode) this.clone();
	byte[] iv = new byte[cipherBlockSize]; // all zeroes
	byte[] k = new byte[ks];
	int i;
	for (i = 0; i < ks; i++)
	k[i] = (byte) i;
	int blockCount = 5;
	int limit = blockCount * bs;
	byte[] pt = new byte[limit];
	for (i = 0; i < limit; i++)
	pt[i] = (byte) i;
	byte[] ct = new byte[limit];
	byte[] cpt = new byte[limit];
	Map map = new HashMap();
	map.put(KEY_MATERIAL, k);
	map.put(CIPHER_BLOCK_SIZE, Integer.valueOf(cipherBlockSize));
	map.put(STATE, Integer.valueOf(ENCRYPTION));
	map.put(IV, iv);
	map.put(MODE_BLOCK_SIZE, Integer.valueOf(bs));
	mode.reset();
	mode.init(map);
	for (i = 0; i < blockCount; i++)
	mode.update(pt, i * bs, ct, i * bs);
	mode.reset();
	map.put(STATE, Integer.valueOf(DECRYPTION));
	mode.init(map);
	for (i = 0; i < blockCount; i++)
	mode.update(ct, i * bs, cpt, i * bs);
	return Arrays.equals(pt, cpt);
	}
	catch (Exception x)
	{
	x.printStackTrace(System.err);
	return false;
	}
	}
	}