mirror of git://gcc.gnu.org/git/gcc.git
148 lines
4.1 KiB
Java
148 lines
4.1 KiB
Java
/* SRPKey.java --
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Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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This file is a 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 of the License, or (at
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your option) 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; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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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 gnu.javax.crypto.key.srp6;
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import gnu.java.security.Registry;
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import gnu.java.security.key.IKeyPairCodec;
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import java.io.Serializable;
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import java.math.BigInteger;
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import java.security.Key;
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/**
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* An abstract representation of a base SRP ephemeral key.
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* <p>
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* This object encapsulates the two numbers:
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* <ul>
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* <li><b>N</b>: A large safe prime (N = 2q+1, where q is prime).</li>
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* <li><b>g</b>: A generator modulo N.</li>
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* </ul>
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* <p>
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* Note that in SRP, all arithmetic is done modulo N.
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* <p>
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* Reference:
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* <ol>
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* <li><a href="http://srp.stanford.edu/design.html">SRP Protocol Design</a><br>
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* Thomas J. Wu.</li>
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* </ol>
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*/
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public abstract class SRPKey
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implements Key, Serializable
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{
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/** The public, Germaine prime, shared modulus. */
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protected final BigInteger N;
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/** The generator. */
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protected final BigInteger g;
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protected SRPKey(BigInteger N, BigInteger g)
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{
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super();
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this.N = N;
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this.g = g;
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}
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/**
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* Returns the standard algorithm name for this key.
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*
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* @return the standard algorithm name for this key.
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*/
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public String getAlgorithm()
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{
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return Registry.SRP_KPG;
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}
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/** @deprecated see getEncoded(int). */
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public byte[] getEncoded()
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{
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return getEncoded(IKeyPairCodec.RAW_FORMAT);
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}
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/**
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* Returns {@link Registry#RAW_ENCODING_SHORT_NAME} which is the sole format
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* supported for this type of keys.
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*
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* @return {@link Registry#RAW_ENCODING_SHORT_NAME} ALWAYS.
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*/
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public String getFormat()
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{
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return Registry.RAW_ENCODING_SHORT_NAME;
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}
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/**
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* Returns the public shared modulus.
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*
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* @return <code>N</code>.
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*/
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public BigInteger getN()
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{
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return N;
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}
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/**
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* Returns the generator.
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*
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* @return <code>g</code>.
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*/
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public BigInteger getG()
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{
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return g;
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}
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/**
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* Returns <code>true</code> if the designated object is an instance of
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* <code>SRPKey</code> and has the same SRP parameter values as this one.
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*
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* @param obj the other non-null SRP key to compare to.
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* @return <code>true</code> if the designated object is of the same type
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* and value as this one.
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*/
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public boolean equals(Object obj)
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{
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if (obj == null)
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return false;
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if (! (obj instanceof SRPKey))
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return false;
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SRPKey that = (SRPKey) obj;
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return N.equals(that.getN()) && g.equals(that.getG());
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}
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public abstract byte[] getEncoded(int format);
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}
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