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diff --git a/libjava/classpath/javax/crypto/CipherOutputStream.java b/libjava/classpath/javax/crypto/CipherOutputStream.java
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+++ b/libjava/classpath/javax/crypto/CipherOutputStream.java
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+/* CipherOutputStream.java -- Filters output through a cipher.
+   Copyright (C) 2004  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 javax.crypto;
+
+import java.io.FilterOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * A filtered output stream that transforms data written to it with a
+ * {@link Cipher} before sending it to the underlying output stream.
+ *
+ * @author Casey Marshall (csm@gnu.org)
+ */
+public class CipherOutputStream extends FilterOutputStream
+{
+  /** The underlying cipher. */
+  private Cipher cipher;
+
+  /**
+   * Create a new cipher output stream. The cipher argument must have already
+   * been initialized.
+   *
+   * @param out The sink for transformed data.
+   * @param cipher The cipher to transform data with.
+   */
+  public CipherOutputStream(OutputStream out, Cipher cipher)
+  {
+    super(out);
+    this.cipher = (cipher != null) ? cipher : new NullCipher();
+  }
+
+  /**
+   * Create a cipher output stream with no cipher.
+   *
+   * @param out The sink for transformed data.
+   */
+  protected CipherOutputStream(OutputStream out)
+  {
+    super(out);
+  }
+
+  /**
+   * Close this output stream, and the sink output stream.
+   * <p>
+   * This method will first invoke the {@link Cipher#doFinal()} method of the
+   * underlying {@link Cipher}, and writes the output of that method to the
+   * sink output stream.
+   *
+   * @throws IOException If an I/O error occurs, or if an error is caused by
+   *           finalizing the transformation.
+   */
+  public void close() throws IOException
+  {
+    try
+      {
+        out.write(cipher.doFinal());
+        out.flush();
+        out.close();
+      }
+    catch (Exception cause)
+      {
+        IOException ioex = new IOException(String.valueOf(cause));
+        ioex.initCause(cause);
+        throw ioex;
+      }
+  }
+
+  /**
+   * Flush any pending output.
+   *
+   * @throws IOException If an I/O error occurs.
+   */
+  public void flush() throws IOException
+  {
+    out.flush();
+  }
+
+  /**
+   * Write a single byte to the output stream.
+   *
+   * @param b The next byte.
+   * @throws IOException If an I/O error occurs, or if the underlying cipher is
+   *           not in the correct state to transform data.
+   */
+  public void write(int b) throws IOException
+  {
+    write(new byte[] { (byte) b }, 0, 1);
+  }
+
+  /**
+   * Write a byte array to the output stream.
+   *
+   * @param buf The next bytes.
+   * @throws IOException If an I/O error occurs, or if the underlying cipher is
+   *           not in the correct state to transform data.
+   */
+  public void write(byte[] buf) throws IOException
+  {
+    write(buf, 0, buf.length);
+  }
+
+  /**
+   * Write a portion of a byte array to the output stream.
+   *
+   * @param buf The next bytes.
+   * @param off The offset in the byte array to start.
+   * @param len The number of bytes to write.
+   * @throws IOException If an I/O error occurs, or if the underlying cipher is
+   *           not in the correct state to transform data.
+   */
+  public void write(byte[] buf, int off, int len) throws IOException
+  {
+    byte[] b = cipher.update(buf, off, len);
+    if (b != null)
+      out.write(b);
+  }
+}