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1 771 jeremybenn
/* Key.java -- A abstract representation of a digital key
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   Copyright (C) 1998, 2000, 2002, 2005  Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING.  If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. */
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package java.security;
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import java.io.Serializable;
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/**
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 * This interfaces models the base characteristics that all keys must
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 * have.  These are:  a key algorithm, an encoded form, and a format used
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 * to encode the key.  Specific key types inherit from this interface.
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 * Note that since this interface extends <code>Serializable</code>, all
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 * keys may be serialized. Keys are generally obtained through key generators,
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 * including {@link KeyFactory}.
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 *
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 * @author Aaron M. Renn (arenn@urbanophile.com)
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 * @see PublicKey
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 * @see PrivateKey
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 * @see KeyPair
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 * @see KeyPairGenerator
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 * @see KeyFactory
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 * @see KeySpec
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 * @see Identity
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 * @see Signer
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 * @since 1.1
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 * @status updated to 1.4
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 */
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public interface Key extends Serializable
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{
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  /**
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   * The version identifier used for serialization.
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   */
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  long serialVersionUID = 6603384152749567654L;
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  /**
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   * This method returns the name of the algorithm for this key.  This is a
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   * <code>String</code> such as "RSA".
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   *
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   * @return the name of the algorithm in use
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   */
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  String getAlgorithm();
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  /**
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   * This method returns the name of the encoding format for this key.  This
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   * is the name of the ASN.1 data format used for this key, such as
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   * "X.509" or "PKCS#8".  This method returns <code>null</code> if this key
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   * does not have an encoding format.
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   *
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   * @return the name of the encoding format for this key, or null
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   */
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  String getFormat();
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  /**
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   * This method returns the encoded form of the key.  If this key does not
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   * support encoding, this method returns <code>null</code>.
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   *
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   * @return the encoded form of the key, or null
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   */
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  byte[] getEncoded();
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} // interface Key

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