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1 files changed, 295 insertions, 0 deletions

diff --git a/libjava/classpath/gnu/javax/crypto/mode/BaseMode.java b/libjava/classpath/gnu/javax/crypto/mode/BaseMode.java
new file mode 100644
index 000000000..831dd9664
--- /dev/null
+++ b/libjava/classpath/gnu/javax/crypto/mode/BaseMode.java
@@ -0,0 +1,295 @@
+/* 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.java.lang.CPStringBuilder;
+
+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 CPStringBuilder(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;
+      }
+  }
+}