Quadcap Embeddable Database

com/quadcap/crypto/RSAPublicKey.java

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package com.quadcap.crypto;

/* Copyright 2002 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.util.Random;
import java.math.BigInteger;
import java.nio.ByteBuffer;

import com.quadcap.util.text.Text;

/**
 * RSA Public key implementation
 *
 * @author Stan Bailes
 */
public class RSAPublicKey extends RSAKey implements PublicKey {
    /**
     * Default constructor
     */
    public RSAPublicKey() {}
    
    /**
     * Construct from simple text representation
     */
    public void init(String rep) {
        String[] s = Text.extractN(rep, "*:*:*");
        super.init(s[3], Integer.parseInt(s[1]), new BigInteger(s[2]));
    }

    /**
     * Convert to simple text representation
     */
    public String toString() {
        return "RSAPub:" + size + ":" + n + ":" + text;
    }

    /**
     * Return the textual identifier associated with this key
     */
    public String getText() {
        return text;
    }

    /**
     * Encrypt a buffer
     */
    public void f(ByteBuffer plain, ByteBuffer encrypted) {
        engine(plain, encrypted);
    }

    /**
     * A single encryption operation for m < n
     */
    public BigInteger engine(BigInteger m) {
        return m.modPow(e, n);
    }
}