Imported GNU Classpath 0.90

Imported GNU Classpath 0.90
       * scripts/makemake.tcl: Set gnu/java/awt/peer/swing to ignore.
       * gnu/classpath/jdwp/VMFrame.java (SIZE): New constant.
       * java/lang/VMCompiler.java: Use gnu.java.security.hash.MD5.
       * java/lang/Math.java: New override file.
       * java/lang/Character.java: Merged from Classpath.
       (start, end): Now 'int's.
       (canonicalName): New field.
       (CANONICAL_NAME, NO_SPACES_NAME, CONSTANT_NAME): New constants.
       (UnicodeBlock): Added argument.
       (of): New overload.
       (forName): New method.
       Updated unicode blocks.
       (sets): Updated.
       * sources.am: Regenerated.
       * Makefile.in: Likewise.

From-SVN: r111942

libjava/classpath/gnu/java/security/util/PRNG.java

@@ -0,0 +1,156 @@
+/* PRNG.java -- A Utility methods for default source of randomness
+   Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is 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, 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; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, 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.java.security.util;
+
+import java.util.HashMap;
+
+import gnu.java.security.prng.IRandom;
+import gnu.java.security.prng.LimitReachedException;
+import gnu.java.security.prng.MDGenerator;
+
+/**
+ * A useful hash-based (SHA) pseudo-random number generator used
+ * throughout this library.
+ * 
+ * @see MDGenerator
+ */
+public class PRNG
+{
+  // Constans and fields
+  // --------------------------------------------------------------------------
+
+  /** The underlying {@link IRandom}. */
+  private IRandom delegate;
+
+  // Constructor(s)
+  // --------------------------------------------------------------------------
+
+  /**
+   * Private constructor to enforce using the Factory method.
+   * 
+   * @param delegate
+   *          the undelying {@link IRandom} object used.
+   */
+  private PRNG(IRandom delegate)
+  {
+    super();
+
+    this.delegate = delegate;
+  }
+
+  // Class methods
+  // --------------------------------------------------------------------------
+
+  public static final PRNG getInstance()
+  {
+    IRandom delegate = new MDGenerator();
+    try
+      {
+        HashMap map = new HashMap();
+        // initialise it with a seed
+        long t = System.currentTimeMillis();
+        byte[] seed = new byte[] {
+            (byte) (t >>> 56), (byte) (t >>> 48),
+            (byte) (t >>> 40), (byte) (t >>> 32),
+            (byte) (t >>> 24), (byte) (t >>> 16),
+            (byte) (t >>>  8), (byte)  t};
+        map.put(MDGenerator.SEEED, seed);
+        delegate.init(map); // default is to use SHA-1 hash
+      }
+    catch (Exception x)
+      {
+        throw new ExceptionInInitializerError(x);
+      }
+
+    return new PRNG(delegate);
+  }
+
+  // Instance methods
+  // --------------------------------------------------------------------------
+
+  /**
+   * Completely fills the designated <code>buffer</code> with random data
+   * generated by the underlying delegate.
+   * 
+   * @param buffer
+   *          the place holder of random bytes generated by the underlying
+   *          delegate. On output, the contents of <code>buffer</code> are
+   *          replaced with pseudo-random data, iff the <code>buffer</code>
+   *          size is not zero.
+   */
+  public void nextBytes(byte[] buffer)
+  {
+    nextBytes(buffer, 0, buffer.length);
+  }
+
+  /**
+   * Fills the designated <code>buffer</code>, starting from byte at position
+   * <code>offset</code> with, at most, <code>length</code> bytes of random
+   * data generated by the underlying delegate.
+   * 
+   * @see IRandom#nextBytes
+   */
+  public void nextBytes(byte[] buffer, int offset, int length)
+  {
+    try
+      {
+        delegate.nextBytes(buffer, offset, length);
+      }
+    catch (LimitReachedException x) // re-initialise with a seed
+      {
+        try
+          {
+            HashMap map = new HashMap();
+            long t = System.currentTimeMillis();
+            byte[] seed = new byte[] {
+                (byte)(t >>> 56), (byte)(t >>> 48),
+                (byte)(t >>> 40), (byte)(t >>> 32),
+                (byte)(t >>> 24), (byte)(t >>> 16),
+                (byte)(t >>>  8), (byte) t };
+            map.put(MDGenerator.SEEED, seed);
+            delegate.init(map); // default is to use SHA-1 hash
+            delegate.nextBytes(buffer, offset, length);
+          }
+        catch (Exception y)
+          {
+            throw new ExceptionInInitializerError(y);
+          }
+      }
+  }
+}