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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@111942 138bc75d-0d04-0410-961f-82ee72b054a4

5 files changed, 786 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 00000000000..0c071561b6f
--- /dev/null
+++ b/libjava/classpath/gnu/javax/crypto/jce/prng/ARCFourRandomSpi.java
@@ -0,0 +1,120 @@
+/* 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.javax.crypto.prng.ARCFour;
+import gnu.java.security.prng.IRandom;
+import gnu.java.security.prng.LimitReachedException;
+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
+{
+
+  // Constants and variables
+  // -------------------------------------------------------------------------
+
+  /** Our underlying prng instance. */
+  private IRandom adaptee;
+
+  /** Have we been initialized? */
+  private boolean virgin;
+
+  // Constructor(s)
+  // -------------------------------------------------------------------------
+
+  /**
+   * Default 0-arguments constructor.
+   */
+  public ARCFourRandomSpi()
+  {
+    super();
+    adaptee = PRNGFactory.getInstance(Registry.ARCFOUR_PRNG);
+    virgin = true;
+  }
+
+  // Class methods
+  // -------------------------------------------------------------------------
+
+  // Instance methods
+  // -------------------------------------------------------------------------
+
+  // java.security.SecureRandomSpi interface implementation ------------------
+
+  public byte[] engineGenerateSeed(int numBytes)
+  {
+    if (numBytes < 1)
+      {
+        return new byte[0];
+      }
+    byte[] result = new byte[numBytes];
+    this.engineNextBytes(result);
+    return result;
+  }
+
+  public void engineNextBytes(byte[] bytes)
+  {
+    if (virgin)
+      {
+        this.engineSetSeed(new byte[0]);
+      }
+    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;
+  }
+}
\ No newline at end of file
diff --git a/libjava/classpath/gnu/javax/crypto/jce/prng/CSPRNGSpi.java b/libjava/classpath/gnu/javax/crypto/jce/prng/CSPRNGSpi.java
new file mode 100644
index 00000000000..c0aa015b065
--- /dev/null
+++ b/libjava/classpath/gnu/javax/crypto/jce/prng/CSPRNGSpi.java
@@ -0,0 +1,114 @@
+/* CSPRNGSpi.java -- 
+   Copyright (C) 2004, 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.javax.crypto.prng.CSPRNG;
+import gnu.java.security.prng.IRandom;
+import gnu.java.security.prng.LimitReachedException;
+
+import java.net.MalformedURLException;
+import java.security.SecureRandomSpi;
+
+/**
+ * The implementation of the continuously-seeded SecureRandom
+ * <i>Service Provider Interface</i> (<b>SPI</b>) adapter.<p>
+ */
+public class CSPRNGSpi extends SecureRandomSpi
+{
+
+  // Constants and variables
+  // -------------------------------------------------------------------------
+
+  private final IRandom adaptee;
+
+  // Constructor(s)
+  // -------------------------------------------------------------------------
+
+  public CSPRNGSpi() throws ClassNotFoundException, MalformedURLException,
+      NumberFormatException
+  {
+    super();
+
+    adaptee = CSPRNG.getSystemInstance();
+  }
+
+  // Instance methods
+  // -------------------------------------------------------------------------
+
+  protected byte[] engineGenerateSeed(final int count)
+  {
+    if (count < 0)
+      {
+        throw new IllegalArgumentException("count must be nonnegative");
+      }
+    byte[] buf = new byte[count];
+    if (count == 0)
+      {
+        return buf;
+      }
+    engineNextBytes(buf);
+    return buf;
+  }
+
+  protected void engineNextBytes(final byte[] buffer)
+  {
+    if (buffer == null)
+      {
+        throw new NullPointerException();
+      }
+    try
+      {
+        adaptee.nextBytes(buffer, 0, buffer.length);
+      }
+    catch (LimitReachedException lre)
+      {
+        throw new RuntimeException("random-number generator has been exhausted");
+      }
+  }
+
+  protected void engineSetSeed(final byte[] seed)
+  {
+    if (seed == null)
+      {
+        throw new NullPointerException();
+      }
+    adaptee.addRandomBytes(seed, 0, seed.length);
+  }
+}
\ No newline at end of file
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 00000000000..7006bbbaddc
--- /dev/null
+++ b/libjava/classpath/gnu/javax/crypto/jce/prng/FortunaImpl.java
@@ -0,0 +1,85 @@
+/* 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.javax.crypto.prng.Fortuna;
+import java.security.SecureRandomSpi;
+import java.util.Collections;
+
+public final class FortunaImpl extends SecureRandomSpi
+{
+  private final Fortuna adaptee;
+
+  public FortunaImpl ()
+  {
+    adaptee = new Fortuna ();
+    adaptee.init (Collections.singletonMap (Fortuna.SEED, new byte[0]));
+  }
+  
+  protected void engineSetSeed (byte[] seed)
+  {
+    synchronized (adaptee)
+      {
+        adaptee.addRandomBytes (seed);
+      }
+  }
+
+  protected void engineNextBytes(byte[] buffer)
+  {
+    synchronized (adaptee)
+      {
+        try
+          {
+            adaptee.nextBytes (buffer);
+          }
+        catch (LimitReachedException shouldNotHappen)
+          {
+            throw new Error (shouldNotHappen);
+          }
+      }
+  }
+
+  protected byte[] engineGenerateSeed (int numbytes)
+  {
+    byte[] seed = new byte[numbytes];
+    engineNextBytes (seed);
+    return seed;
+  }
+}
\ No newline at end of file
diff --git a/libjava/classpath/gnu/javax/crypto/jce/prng/ICMRandomSpi.java b/libjava/classpath/gnu/javax/crypto/jce/prng/ICMRandomSpi.java
new file mode 100644
index 00000000000..d04b782f9f5
--- /dev/null
+++ b/libjava/classpath/gnu/javax/crypto/jce/prng/ICMRandomSpi.java
@@ -0,0 +1,260 @@
+/* ICMRandomSpi.java -- 
+   Copyright (C) 2001, 2002, 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.javax.crypto.cipher.IBlockCipher;
+import gnu.javax.crypto.prng.ICMGenerator;
+import gnu.java.security.prng.LimitReachedException;
+
+import java.io.PrintWriter;
+import java.math.BigInteger;
+import java.security.SecureRandomSpi;
+import java.util.HashMap;
+import java.util.Random;
+
+/**
+ * <p>An <em>Adapter</em> class around {@link ICMGenerator} to allow using this
+ * algorithm as a JCE {@link java.security.SecureRandom}.</p>
+ */
+public class ICMRandomSpi extends SecureRandomSpi
+{
+
+  // Debugging methods and variables
+  // -------------------------------------------------------------------------
+
+  private static final String NAME = "ICMRandomSpi";
+
+  private static final boolean DEBUG = false;
+
+  private static final int debuglevel = 0;
+
+  private static final PrintWriter err = new PrintWriter(System.out, true);
+
+  private static void debug(String s)
+  {
+    err.println(">>> " + NAME + ": " + s);
+  }
+
+  // Constants and variables
+  // -------------------------------------------------------------------------
+
+  /** Class-wide prng to generate random material for the underlying prng.*/
+  private static final ICMGenerator prng; // blank final
+  static
+    {
+      prng = new ICMGenerator();
+      resetLocalPRNG();
+    }
+
+  // error messages
+  private static final String MSG = "Exception while setting up an "
+                                    + Registry.ICM_PRNG + " SPI: ";
+
+  private static final String RETRY = "Retry...";
+
+  private static final String LIMIT_REACHED_MSG = "Limit reached: ";
+
+  private static final String RESEED = "Re-seed...";
+
+  /** Our underlying prng instance. */
+  private ICMGenerator adaptee = new ICMGenerator();
+
+  // Constructor(s)
+  // -------------------------------------------------------------------------
+
+  // default 0-arguments constructor
+
+  // Class methods
+  // -------------------------------------------------------------------------
+
+  private static void resetLocalPRNG()
+  {
+    if (DEBUG && debuglevel > 8)
+      debug(">>> resetLocalPRNG()");
+    HashMap attributes = new HashMap();
+    attributes.put(ICMGenerator.CIPHER, Registry.AES_CIPHER);
+    byte[] key = new byte[128 / 8]; // AES default key size
+    Random rand = new Random(System.currentTimeMillis());
+    rand.nextBytes(key);
+    attributes.put(IBlockCipher.KEY_MATERIAL, key);
+    int aesBlockSize = 128 / 8; // AES block size in bytes
+    byte[] offset = new byte[aesBlockSize];
+    rand.nextBytes(offset);
+    attributes.put(ICMGenerator.OFFSET, offset);
+    int ndxLen = 0; // the segment length
+    // choose a random value between 1 and aesBlockSize / 2
+    int limit = aesBlockSize / 2;
+    while (ndxLen < 1 || ndxLen > limit)
+      {
+        ndxLen = rand.nextInt(limit + 1);
+      }
+    attributes.put(ICMGenerator.SEGMENT_INDEX_LENGTH, new Integer(ndxLen));
+    byte[] index = new byte[ndxLen];
+    rand.nextBytes(index);
+    attributes.put(ICMGenerator.SEGMENT_INDEX, new BigInteger(1, index));
+
+    prng.setup(attributes);
+    if (DEBUG && debuglevel > 8)
+      debug("<<< resetLocalPRNG()");
+  }
+
+  // Instance methods
+  // -------------------------------------------------------------------------
+
+  // java.security.SecureRandomSpi interface implementation ------------------
+
+  public byte[] engineGenerateSeed(int numBytes)
+  {
+    if (DEBUG && debuglevel > 8)
+      debug(">>> engineGenerateSeed()");
+    if (numBytes < 1)
+      {
+        if (DEBUG && debuglevel > 8)
+          debug("<<< engineGenerateSeed()");
+        return new byte[0];
+      }
+    byte[] result = new byte[numBytes];
+    this.engineNextBytes(result);
+    if (DEBUG && debuglevel > 8)
+      debug("<<< engineGenerateSeed()");
+    return result;
+  }
+
+  public void engineNextBytes(byte[] bytes)
+  {
+    if (DEBUG && debuglevel > 8)
+      debug(">>> engineNextBytes()");
+    if (!adaptee.isInitialised())
+      {
+        this.engineSetSeed(new byte[0]);
+      }
+
+    while (true)
+      {
+        try
+          {
+            adaptee.nextBytes(bytes, 0, bytes.length);
+            break;
+          }
+        catch (LimitReachedException x)
+          { // reseed the generator
+            if (DEBUG)
+              {
+                debug(LIMIT_REACHED_MSG + String.valueOf(x));
+                x.printStackTrace(err);
+                debug(RESEED);
+              }
+            resetLocalPRNG();
+          }
+      }
+    if (DEBUG && debuglevel > 8)
+      debug("<<< engineNextBytes()");
+  }
+
+  public void engineSetSeed(byte[] seed)
+  {
+    if (DEBUG && debuglevel > 8)
+      debug(">>> engineSetSeed()");
+    // compute the total number of random bytes required to setup adaptee
+    int materialLength = 0;
+    materialLength += 16; // key material size
+    materialLength += 16; // offset size
+    materialLength += 8; // index size == half of an AES block
+    byte[] material = new byte[materialLength];
+
+    // use as much as possible bytes from the seed
+    int materialOffset = 0;
+    int materialLeft = material.length;
+    if (seed.length > 0)
+      { // copy some bytes into key and update indices
+        int lenToCopy = Math.min(materialLength, seed.length);
+        System.arraycopy(seed, 0, material, 0, lenToCopy);
+        materialOffset += lenToCopy;
+        materialLeft -= lenToCopy;
+      }
+    if (materialOffset > 0)
+      { // generate the rest
+        while (true)
+          {
+            try
+              {
+                prng.nextBytes(material, materialOffset, materialLeft);
+                break;
+              }
+            catch (IllegalStateException x)
+              { // should not happen
+                throw new InternalError(MSG + String.valueOf(x));
+              }
+            catch (LimitReachedException x)
+              {
+                if (DEBUG)
+                  {
+                    debug(MSG + String.valueOf(x));
+                    debug(RETRY);
+                  }
+              }
+          }
+      }
+
+    // setup the underlying adaptee instance
+    HashMap attributes = new HashMap();
+
+    // use AES cipher with 128-bit block size
+    attributes.put(ICMGenerator.CIPHER, Registry.AES_CIPHER);
+    // use an index the size of quarter of an AES block
+    attributes.put(ICMGenerator.SEGMENT_INDEX_LENGTH, new Integer(4));
+    // specify the key
+    byte[] key = new byte[16];
+    System.arraycopy(material, 0, key, 0, 16);
+    attributes.put(IBlockCipher.KEY_MATERIAL, key);
+    // specify the offset
+    byte[] offset = new byte[16];
+    System.arraycopy(material, 16, offset, 0, 16);
+    attributes.put(ICMGenerator.OFFSET, offset);
+    // specify the index
+    byte[] index = new byte[8];
+    System.arraycopy(material, 32, index, 0, 8);
+    attributes.put(ICMGenerator.SEGMENT_INDEX, new BigInteger(1, index));
+
+    adaptee.init(attributes);
+    if (DEBUG && debuglevel > 8)
+      debug("<<< engineSetSeed()");
+  }
+}
\ No newline at end of file
diff --git a/libjava/classpath/gnu/javax/crypto/jce/prng/UMacRandomSpi.java b/libjava/classpath/gnu/javax/crypto/jce/prng/UMacRandomSpi.java
new file mode 100644
index 00000000000..7dad68b2f95
--- /dev/null
+++ b/libjava/classpath/gnu/javax/crypto/jce/prng/UMacRandomSpi.java
@@ -0,0 +1,207 @@
+/* UMacRandomSpi.java -- 
+   Copyright (C) 2001, 2002, 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.javax.crypto.cipher.IBlockCipher;
+import gnu.java.security.prng.LimitReachedException;
+import gnu.javax.crypto.prng.UMacGenerator;
+
+import java.io.PrintWriter;
+import java.security.SecureRandomSpi;
+import java.util.HashMap;
+import java.util.Random;
+
+/**
+ * <p>An <em>Adapter</em> class around {@link UMacGenerator} to allow using this
+ * algorithm as a JCE {@link java.security.SecureRandom}.</p>
+ */
+public class UMacRandomSpi extends SecureRandomSpi
+{
+
+  // Debugging methods and variables
+  // -------------------------------------------------------------------------
+
+  private static final String NAME = "UMacRandomSpi";
+
+  private static final boolean DEBUG = false;
+
+  private static final PrintWriter err = new PrintWriter(System.out, true);
+
+  private static void debug(String s)
+  {
+    err.println(">>> " + NAME + ": " + s);
+  }
+
+  // Constants and variables
+  // -------------------------------------------------------------------------
+
+  /** Class-wide prng to generate random material for the underlying prng.*/
+  private static final UMacGenerator prng; // blank final
+  static
+    {
+      prng = new UMacGenerator();
+      resetLocalPRNG();
+    }
+
+  // error messages
+  private static final String MSG = "Exception while setting up a "
+                                    + Registry.UMAC_PRNG + " SPI: ";
+
+  private static final String RETRY = "Retry...";
+
+  /** Our underlying prng instance. */
+  private UMacGenerator adaptee = new UMacGenerator();
+
+  // Constructor(s)
+  // -------------------------------------------------------------------------
+
+  // default 0-arguments constructor
+
+  // Class methods
+  // -------------------------------------------------------------------------
+
+  private static void resetLocalPRNG()
+  {
+    HashMap attributes = new HashMap();
+    attributes.put(UMacGenerator.CIPHER, Registry.AES_CIPHER);
+    byte[] key = new byte[128 / 8]; // AES default key size
+    Random rand = new Random(System.currentTimeMillis());
+    rand.nextBytes(key);
+    attributes.put(IBlockCipher.KEY_MATERIAL, key);
+    int index = rand.nextInt() & 0xFF;
+    attributes.put(UMacGenerator.INDEX, new Integer(index));
+
+    prng.setup(attributes);
+  }
+
+  // Instance methods
+  // -------------------------------------------------------------------------
+
+  // java.security.SecureRandomSpi interface implementation ------------------
+
+  public byte[] engineGenerateSeed(int numBytes)
+  {
+    if (numBytes < 1)
+      {
+        return new byte[0];
+      }
+    byte[] result = new byte[numBytes];
+    this.engineNextBytes(result);
+    return result;
+  }
+
+  public void engineNextBytes(byte[] bytes)
+  {
+    if (!adaptee.isInitialised())
+      {
+        this.engineSetSeed(new byte[0]);
+      }
+
+    while (true)
+      {
+        try
+          {
+            adaptee.nextBytes(bytes, 0, bytes.length);
+            break;
+          }
+        catch (LimitReachedException x)
+          { // reseed the generator
+            resetLocalPRNG();
+          }
+      }
+  }
+
+  public void engineSetSeed(byte[] seed)
+  {
+    // compute the total number of random bytes required to setup adaptee
+    int materialLength = 0;
+    materialLength += 16; // key material size
+    materialLength++; // index size
+    byte[] material = new byte[materialLength];
+
+    // use as much as possible bytes from the seed
+    int materialOffset = 0;
+    int materialLeft = material.length;
+    if (seed.length > 0)
+      { // copy some bytes into key and update indices
+        int lenToCopy = Math.min(materialLength, seed.length);
+        System.arraycopy(seed, 0, material, 0, lenToCopy);
+        materialOffset += lenToCopy;
+        materialLeft -= lenToCopy;
+      }
+    if (materialOffset > 0)
+      { // generate the rest
+        while (true)
+          {
+            try
+              {
+                prng.nextBytes(material, materialOffset, materialLeft);
+                break;
+              }
+            catch (IllegalStateException x)
+              { // should not happen
+                throw new InternalError(MSG + String.valueOf(x));
+              }
+            catch (LimitReachedException x)
+              {
+                if (DEBUG)
+                  {
+                    debug(MSG + String.valueOf(x));
+                    debug(RETRY);
+                  }
+              }
+          }
+      }
+
+    // setup the underlying adaptee instance
+    HashMap attributes = new HashMap();
+
+    // use AES cipher with 128-bit block size
+    attributes.put(UMacGenerator.CIPHER, Registry.AES_CIPHER);
+    // specify the key
+    byte[] key = new byte[16];
+    System.arraycopy(material, 0, key, 0, 16);
+    attributes.put(IBlockCipher.KEY_MATERIAL, key);
+    // use a 1-byte index
+    attributes.put(UMacGenerator.INDEX, new Integer(material[16] & 0xFF));
+
+    adaptee.init(attributes);
+  }
+}
\ No newline at end of file