1 files changed, 100 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/crypto/jce/prng/FortunaImpl.java b/libjava/classpath/gnu/javax/crypto/jce/prng/FortunaImpl.java
new file mode 100644
index 000000000..d2073b98d
--- /dev/null
+++ b/libjava/classpath/gnu/javax/crypto/jce/prng/FortunaImpl.java
@@ -0,0 +1,100 @@
+/* FortunaImpl.java -- Fortuna SecureRandom adapter.
+   Copyright (C) 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.jce.prng;
+
+import gnu.java.security.prng.LimitReachedException;
+
+import gnu.java.security.jce.prng.SecureRandomAdapter;
+
+import gnu.javax.crypto.prng.Fortuna;
+
+import java.security.SecureRandomSpi;
+import java.util.Collections;
+
+public final class FortunaImpl
+    extends SecureRandomSpi
+{
+  private boolean virgin = true;
+  private final Fortuna adaptee;
+
+  public FortunaImpl()
+  {
+    adaptee = new Fortuna();
+  }
+
+  protected void engineSetSeed(byte[] seed)
+  {
+    synchronized (adaptee)
+      {
+        if (virgin)
+          {
+            adaptee.init (Collections.singletonMap (Fortuna.SEED, seed));
+            virgin = false;
+          }
+        else
+          {
+            adaptee.addRandomBytes (seed);
+          }
+      }
+  }
+
+  protected void engineNextBytes(byte[] buffer)
+  {
+    synchronized (adaptee)
+      {
+        if (virgin)
+          {
+            this.engineSetSeed(engineGenerateSeed(32));
+          }
+        try
+          {
+            adaptee.nextBytes(buffer);
+          }
+        catch (LimitReachedException shouldNotHappen)
+          {
+            throw new Error(shouldNotHappen);
+          }
+      }
+  }
+
+  protected byte[] engineGenerateSeed(int numBytes)
+  {
+    return SecureRandomAdapter.getSeed(numBytes);
+  }
+}