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+/* PBEKeySpec.java -- Wrapper for password-based keys.
+   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.spec;
+
+import java.security.spec.KeySpec;
+
+/**
+ * A wrapper for a password-based key, used for password-based
+ * encryption (PBE).
+ *
+ * <p>Examples of password-based encryption algorithms include:
+ *
+ * <ul>
+ * <li><a href="http://www.rsasecurity.com/rsalabs/pkcs/pkcs-5/">PKCS #5
+ * - Password-Based Cryptography Standard</a></li>
+ * <li><a href="http://www.rsasecurity.com/rsalabs/pkcs/pkcs-12/">PKCS
+ * #12 - Personal Information Exchange Syntax Standard</a></li>
+ * </ul>
+ *
+ * @author Casey Marshall (csm@gnu.org)
+ * @since 1.4
+ * @see javax.crypto.SecretKeyFactory
+ * @see PBEParameterSpec
+ */
+public class PBEKeySpec implements KeySpec
+{
+
+  // Fields.
+  // ------------------------------------------------------------------------
+
+  /** The iteration count. */
+  private int iterationCount;
+
+  /** The generated key length. */
+  private int keyLength;
+
+  /** The password. */
+  private char[] password;
+
+  /** The salt. */
+  private byte[] salt;
+
+  // Constructors.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Create a new PBE key spec with just a password.
+   *
+   * @param password The password char array.
+   */
+  public PBEKeySpec(char[] password)
+  {
+    this(password, null, 0, 0);
+  }
+
+  /**
+   * Create a PBE key spec with a password, salt, and iteration count.
+   *
+   * @param password       The password char array.
+   * @param salt           The salt bytes.
+   * @param iterationCount The iteration count.
+   */
+  public PBEKeySpec(char[] password, byte[] salt, int iterationCount)
+  {
+    this(password, salt, iterationCount, 0);
+  }
+
+  /**
+   * Create a PBE key spec with a password, salt, iteration count, and
+   * key length.
+   *
+   * @param password       The password char array.
+   * @param salt           The salt bytes.
+   * @param iterationCount The iteration count.
+   * @param keyLength      The generated key length.
+   */
+  public PBEKeySpec(char[] password, byte[] salt, int iterationCount,
+                    int keyLength)
+  {
+    this.password = password;
+    this.salt = salt;
+    this.iterationCount = iterationCount;
+    this.keyLength = keyLength;
+  }
+
+  // Instance methods.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Clear the password array by filling it with null characters.
+   */
+  public final void clearPassword()
+  {
+    if (password == null) return;
+    for (int i = 0; i < password.length; i++)
+      {
+        password[i] = '\u0000';
+      }
+  }
+
+  /**
+   * Get the iteration count, or 0 if it has not been specified.
+   *
+   * @return The iteration count, or 0 if it has not been specified.
+   */
+  public final int getIterationCount()
+  {
+    return iterationCount;
+  }
+
+  /**
+   * Get the generated key length, or 0 if it has not been specified.
+   *
+   * @return The key length, or 0 if it has not been specified.
+   */
+  public final int getKeyLength()
+  {
+    return keyLength;
+  }
+
+  /**
+   * Get the password character array.
+   *
+   * @return The password.
+   */
+  public final char[] getPassword()
+  {
+    return password;
+  }
+
+  /**
+   * Get the salt bytes.
+   *
+   * @return The salt.
+   */
+  public final byte[] getSalt()
+  {
+    return salt;
+  }
+}