1 files changed, 145 insertions, 0 deletions
diff --git a/plugins/org.eclipse.net4j.util/src/org/eclipse/net4j/internal/util/security/Randomizer.java b/plugins/org.eclipse.net4j.util/src/org/eclipse/net4j/internal/util/security/Randomizer.java
new file mode 100644
index 0000000000..058f29b355
--- /dev/null
+++ b/plugins/org.eclipse.net4j.util/src/org/eclipse/net4j/internal/util/security/Randomizer.java
@@ -0,0 +1,145 @@
+/***************************************************************************
+ * Copyright (c) 2004 - 2007 Eike Stepper, Germany.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Contributors:
+ *    Eike Stepper - initial API and implementation
+ **************************************************************************/
+package org.eclipse.net4j.internal.util.security;
+
+import org.eclipse.net4j.internal.util.lifecycle.Lifecycle;
+import org.eclipse.net4j.util.security.IRandomizer;
+
+import java.security.SecureRandom;
+
+/**
+ * @author Eike Stepper
+ */
+public class Randomizer extends Lifecycle implements IRandomizer
+{
+  public static final String ALGORITHM_SHA1PRNG = "SHA1PRNG";
+
+  public static final String DEFAULT_ALGORITHM_NAME = ALGORITHM_SHA1PRNG;
+
+  private String algorithmName = DEFAULT_ALGORITHM_NAME;
+
+  private String providerName;
+
+  private transient SecureRandom secureRandom;
+
+  public String getAlgorithmName()
+  {
+    return algorithmName;
+  }
+
+  public void setAlgorithmName(String algorithmName)
+  {
+    this.algorithmName = algorithmName;
+  }
+
+  public String getProviderName()
+  {
+    return providerName;
+  }
+
+  public void setProviderName(String providerName)
+  {
+    this.providerName = providerName;
+  }
+
+  public boolean nextBoolean()
+  {
+    return secureRandom.nextBoolean();
+  }
+
+  public double nextDouble()
+  {
+    return secureRandom.nextDouble();
+  }
+
+  public float nextFloat()
+  {
+    return secureRandom.nextFloat();
+  }
+
+  public synchronized double nextGaussian()
+  {
+    return secureRandom.nextGaussian();
+  }
+
+  public int nextInt()
+  {
+    return secureRandom.nextInt();
+  }
+
+  public int nextInt(int n)
+  {
+    return secureRandom.nextInt(n);
+  }
+
+  public long nextLong()
+  {
+    return secureRandom.nextLong();
+  }
+
+  public byte[] generateSeed(int numBytes)
+  {
+    return secureRandom.generateSeed(numBytes);
+  }
+
+  public String getAlgorithm()
+  {
+    return secureRandom.getAlgorithm();
+  }
+
+  public synchronized void nextBytes(byte[] bytes)
+  {
+    secureRandom.nextBytes(bytes);
+  }
+
+  public synchronized void setSeed(byte[] seed)
+  {
+    secureRandom.setSeed(seed);
+  }
+
+  public void setSeed(long seed)
+  {
+    secureRandom.setSeed(seed);
+  }
+
+  @Override
+  protected void doBeforeActivate() throws Exception
+  {
+    super.doBeforeActivate();
+    if (algorithmName == null)
+    {
+      throw new IllegalStateException("algorithmName == null");
+    }
+  }
+
+  @Override
+  protected void doActivate() throws Exception
+  {
+    super.doActivate();
+    if (providerName == null)
+    {
+      secureRandom = SecureRandom.getInstance(algorithmName);
+    }
+    else
+    {
+      secureRandom = SecureRandom.getInstance(algorithmName, providerName);
+    }
+
+    secureRandom.setSeed(System.currentTimeMillis());
+  }
+
+  @Override
+  protected void doDeactivate() throws Exception
+  {
+    secureRandom = null;
+    super.doDeactivate();
+  }
+}