elgamalkey.java

jpeg2000编解码

/*
// $Log: ElGamalKey.java,v $
// Revision 1.1.1.1  2002/08/27 11:49:31  grosbois
// Imported source from cryptix 3.2
//
// Revision 1.2  2000/08/17 11:35:28  edwin
// Package move java.* -> xjava.*, which is needed for JDK 1.3 compatibility.
// I had to break permission support even further to make this work (I don't
// believe it was working in the first place, so it's not really a problem).
//
// Revision 1.1.1.1  1997/11/03 22:36:58  hopwood
// + Imported to CVS (tagged as 'start').
//
// $Endlog$
*/

package xjava.security.interfaces;

import java.math.BigInteger;

/**
 * The interface to an ElGamal public or private key.
 * <p>
 * <b>References</b>
 * <p>
 * <blockquote>
 *    <a href="mailto:[e-mail]">Bruce Schneier</a>,
 *    "Section 19.6 ElGamal,"
 *    <cite>Applied Cryptography</cite>,
 *    Wiley 2nd Ed, 1996.
 * </blockquote>
 *
 * <p><b>$Revision: 1.1.1.1 $</b>
 * @author David Hopwood
 * @since  IJCE 1.0.1
 * @see ElGamalParams
 * @see java.security.Key
 * @see java.security.Cipher
 * @see java.security.Signature
 */
public interface ElGamalKey {
    /**
     * Returns the prime, <i>p</i>.
     * 
     * @return the prime as a java.math.BigInteger
     */
    BigInteger getP();

    /**
     * Returns the base, <i>g</i>.
     * 
     * @return the base as a java.math.BigInteger 
     */
    BigInteger getG();

    /**
     * Returns the value of <i>y = g^x</i> mod <i>p</i> (where <i>x</i> is
     * the private key).
     *
     * @return y as a java.math.BigInteger
     */
    BigInteger getY();
}