1 files changed, 102 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/crypto/jce/prng/ARCFourRandomSpi.java b/libjava/classpath/gnu/javax/crypto/jce/prng/ARCFourRandomSpi.java
new file mode 100644
index 000000000..3816fb648
--- /dev/null
+++ b/libjava/classpath/gnu/javax/crypto/jce/prng/ARCFourRandomSpi.java
@@ -0,0 +1,102 @@
+/* ARCFourRandomSpi.java --
+   Copyright (C) 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.jce.prng;
+
+import gnu.java.security.Registry;
+
+import gnu.java.security.jce.prng.SecureRandomAdapter;
+
+import gnu.java.security.prng.IRandom;
+import gnu.java.security.prng.LimitReachedException;
+
+import gnu.javax.crypto.prng.ARCFour;
+import gnu.javax.crypto.prng.PRNGFactory;
+
+import java.security.SecureRandomSpi;
+
+import java.util.HashMap;
+
+/**
+ * Implementation of the <i>Service Provider Interface</i> (<b>SPI</b>) for
+ * the ARCFOUR keystream generator.
+ */
+public class ARCFourRandomSpi
+    extends SecureRandomSpi
+{
+  /** Our underlying prng instance. */
+  private IRandom adaptee;
+  /** Have we been initialized? */
+  private boolean virgin;
+
+  /**
+   * Default 0-arguments constructor.
+   */
+  public ARCFourRandomSpi()
+  {
+    super();
+    adaptee = PRNGFactory.getInstance(Registry.ARCFOUR_PRNG);
+    virgin = true;
+  }
+
+  public byte[] engineGenerateSeed(int numBytes)
+  {
+    return SecureRandomAdapter.getSeed(numBytes);
+  }
+
+  public void engineNextBytes(byte[] bytes)
+  {
+    if (virgin)
+      this.engineSetSeed(engineGenerateSeed(32));
+    try
+      {
+        adaptee.nextBytes(bytes, 0, bytes.length);
+      }
+    catch (LimitReachedException ignored)
+      {
+      }
+  }
+
+  public void engineSetSeed(byte[] seed)
+  {
+    HashMap attributes = new HashMap();
+    attributes.put(ARCFour.ARCFOUR_KEY_MATERIAL, seed);
+    adaptee.init(attributes);
+    virgin = false;
+  }
+}