generatekey.java

来自「一个java开发的非常全面的关于证书发放」· Java 代码 · 共 135 行

/*
  Name:         GenerateKey.java
  Licensing:    LGPL

  API:          Sun (http://java.sun.com) JCE 1.2.2 API (cleanroom implementation by Bouncy Castle)
  Provider:     Bouncy Castle (http://www.bouncycastle.org)

  Disclaimer:

  COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY OF ANY KIND,
  EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES THAT THE COVERED CODE
  IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE OR NON-INFRINGING. THE ENTIRE
  RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED CODE IS WITH YOU. SHOULD ANY COVERED CODE
  PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR)
  ASSUME THE COST OF ANY NECESSARY SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY
  CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED
  HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
*/

package net.sourceforge.jcetaglib.taglib.crypto;

import net.sourceforge.jcetaglib.lib.Clean;
import net.sourceforge.jcetaglib.lib.Keystore;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

/**
 * JSP tag used to generate a secret/shared (=symmetric) key and store it in a file
 *
 * @jsp.tag
 * name="generatekey"
 * display-name="GenerateKey"
 * body-content="empty"
 * example="
 * 		<%-- Generate a symmetric key file with default algorithm parameters 

 *    	(AES, 256 bit key, CBC/PKCS7Padding) --%>

 * 		<jce:generatekey 

 *			keyfile=\"c:/jspkey.key\" 

 *			passphrase=\"<%= new StringBuffer(\"password\") %>\"/>"
 *
 * description="JSP tag used to generate a secret/shared (=symmetric) key and store it in a file"
 *
 * @author Gert Van Ham
 * @author [e-mail]
 * @author http://jcetaglib.sourceforge.net
 * @version $Id: GenerateKey.java,v 1.5 2004/04/15 07:28:35 hamgert Exp $
 */
public class GenerateKey extends TagSupport {
    private String algorithm = "AES";          // tag attribute
    private int strength = 256;             // tag attribute
    private String seed;                    		// tag attribute
    private String keyfile;                    // tag attribute
    private StringBuffer passphrase;                 // tag attribute

    public int doStartTag() throws JspException {

        try {
            if (seed == null) {
                Keystore.generateKey(algorithm, strength, null, keyfile, passphrase);
            } else {
                Keystore.generateKey(algorithm, strength, seed.getBytes(), keyfile, passphrase);
            }
        } catch (Exception e) {
            e.printStackTrace();
            throw new JspException("JCE Exception: " + e.getMessage(), e);
        } finally {
            this.release();
        }

        return SKIP_BODY;
    }

    public void release() {
        // Cleanup all sensitive information
        Clean.blank(passphrase);

        super.release();
    } //release()

    /**
     * @jsp.attribute
     *     description="The key algorithm. Default is 'AES'"
     *     type="java.lang.String"
     *     required="false"
     *     rtexprvalue="true"
     */
    public void setAlgorithm(String algorithm) {
        this.algorithm = algorithm;
    }

    /**
     * @jsp.attribute
     *     description="The key size in bits (integer value). Values depends on the used algorithm (see next paragraph). Default is 256 (for AES)"
     *     type="java.lang.String"
     *     required="false"
     *     rtexprvalue="true"
     */
    public void setStrength(int strength) {
        this.strength = strength;
    }

    /**
     * @jsp.attribute
     *     description="Optional seed for SecureRandom "
     *     type="java.lang.String"
     *     required="false"
     *     rtexprvalue="true"
     */
    public void setSeed(String seed) {
        this.seed = seed;
    }

    /**
     * @jsp.attribute
     *     description="The symmetric key file(name)"
     *     type="java.lang.String"
     *     required="true"
     *     rtexprvalue="true"
     */
    public void setKeyfile(String keyfile) {
        this.keyfile = keyfile;
    }

    /**
     * @jsp.attribute
     *     description="Keystore passphrase"
     *     type="java.lang.StringBuffer"
     *     required="true"
     *     rtexprvalue="true"
     */
    public void setPassphrase(StringBuffer passphrase) {
        this.passphrase = passphrase;
    }
}