1 files changed, 168 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/key/BaseKeyAgreementParty.java b/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/key/BaseKeyAgreementParty.java
new file mode 100644
index 000000000..fc5ddb714
--- /dev/null
+++ b/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/key/BaseKeyAgreementParty.java
@@ -0,0 +1,168 @@
+/* BaseKeyAgreementParty.java -- 
+   Copyright (C) 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.key;
+
+import gnu.java.security.prng.IRandom;
+import gnu.java.security.prng.LimitReachedException;
+import gnu.java.security.util.PRNG;
+
+import java.math.BigInteger;
+import java.security.SecureRandom;
+import java.util.Map;
+
+/**
+ * A base abstract class to facilitate implementations of concrete key agreement
+ * protocol handlers.
+ */
+public abstract class BaseKeyAgreementParty
+    implements IKeyAgreementParty
+{
+  protected static final BigInteger TWO = BigInteger.valueOf(2L);
+  /** The canonical name of the protocol. */
+  protected String name;
+  /** Whether the instance is initialised or not. */
+  protected boolean initialised = false;
+  /** The current step index of the protocol exchange. */
+  protected int step = -1;
+  /** Whether the exchange has concluded or not. */
+  protected boolean complete = false;
+  /** The optional {@link SecureRandom} instance to use. */
+  protected SecureRandom rnd = null;
+  /** The optional {@link IRandom} instance to use. */
+  protected IRandom irnd = null;
+  /** Our default source of randomness. */
+  private PRNG prng = null;
+
+  protected BaseKeyAgreementParty(String name)
+  {
+    super();
+
+    this.name = name;
+  }
+
+  public String name()
+  {
+    return name;
+  }
+
+  public void init(Map attributes) throws KeyAgreementException
+  {
+    if (initialised)
+      throw new IllegalStateException("already initialised");
+    this.engineInit(attributes);
+    initialised = true;
+    this.step = -1;
+    this.complete = false;
+  }
+
+  public OutgoingMessage processMessage(IncomingMessage in)
+      throws KeyAgreementException
+  {
+    if (! initialised)
+      throw new IllegalStateException("not initialised");
+    if (complete)
+      throw new IllegalStateException("exchange has already concluded");
+    step++;
+    return this.engineProcessMessage(in);
+  }
+
+  public boolean isComplete()
+  {
+    return complete;
+  }
+
+  public byte[] getSharedSecret() throws KeyAgreementException
+  {
+    if (! initialised)
+      throw new KeyAgreementException("not yet initialised");
+    if (! isComplete())
+      throw new KeyAgreementException("not yet computed");
+    return engineSharedSecret();
+  }
+
+  public void reset()
+  {
+    if (initialised)
+      {
+        this.engineReset();
+        initialised = false;
+      }
+  }
+
+  protected abstract void engineInit(Map attributes)
+      throws KeyAgreementException;
+
+  protected abstract OutgoingMessage engineProcessMessage(IncomingMessage in)
+      throws KeyAgreementException;
+
+  protected abstract byte[] engineSharedSecret() throws KeyAgreementException;
+
+  protected abstract void engineReset();
+
+  /**
+   * Fills the designated byte array with random data.
+   * 
+   * @param buffer the byte array to fill with random data.
+   */
+  protected void nextRandomBytes(byte[] buffer)
+  {
+    if (rnd != null)
+      rnd.nextBytes(buffer);
+    else if (irnd != null)
+      try
+        {
+          irnd.nextBytes(buffer, 0, buffer.length);
+        }
+      catch (LimitReachedException lre)
+        {
+          irnd = null;
+          getDefaultPRNG().nextBytes(buffer);
+        }
+    else
+      getDefaultPRNG().nextBytes(buffer);
+  }
+
+  private PRNG getDefaultPRNG()
+  {
+    if (prng == null)
+      prng = PRNG.getInstance();
+
+    return prng;
+  }
+}