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+/* Key.java -- A abstract representation of a digital key
+   Copyright (C) 1998, 2000, 2002, 2005  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 java.security;
+
+import java.io.Serializable;
+
+/**
+ * This interfaces models the base characteristics that all keys must
+ * have.  These are:  a key algorithm, an encoded form, and a format used
+ * to encode the key.  Specific key types inherit from this interface.
+ * Note that since this interface extends <code>Serializable</code>, all
+ * keys may be serialized. Keys are generally obtained through key generators,
+ * including {@link KeyFactory}.
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ * @see PublicKey
+ * @see PrivateKey
+ * @see KeyPair
+ * @see KeyPairGenerator
+ * @see KeyFactory
+ * @see KeySpec
+ * @see Identity
+ * @see Signer
+ * @since 1.1
+ * @status updated to 1.4
+ */
+public interface Key extends Serializable
+{
+  /**
+   * The version identifier used for serialization.
+   */
+  long serialVersionUID = 6603384152749567654L;
+
+  /**
+   * This method returns the name of the algorithm for this key.  This is a
+   * <code>String</code> such as "RSA".
+   *
+   * @return the name of the algorithm in use
+   */
+  String getAlgorithm();
+
+  /**
+   * This method returns the name of the encoding format for this key.  This
+   * is the name of the ASN.1 data format used for this key, such as
+   * "X.509" or "PKCS#8".  This method returns <code>null</code> if this key
+   * does not have an encoding format.
+   *
+   * @return the name of the encoding format for this key, or null
+   */
+  String getFormat();
+
+  /**
+   * This method returns the encoded form of the key.  If this key does not
+   * support encoding, this method returns <code>null</code>.
+   *
+   * @return the encoded form of the key, or null
+   */
+  byte[] getEncoded();
+} // interface Key