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Java example source code file (PrivateKeyUsageExtension.java)

This example Java source code file (PrivateKeyUsageExtension.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

attribute, certattrset\:privatekeyusage, certificateexception, certificateexpiredexception, certificatenotyetvalidexception, certificateparsingexception, date, deroutputstream, duplicate, ioexception, object, privatekeyusage, privatekeyusageextension, string, util

The PrivateKeyUsageExtension.java Java example source code

/*
 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.security.x509;

import java.io.IOException;
import java.io.OutputStream;
import java.security.cert.CertificateException;
import java.security.cert.CertificateParsingException;
import java.security.cert.CertificateExpiredException;
import java.security.cert.CertificateNotYetValidException;
import java.util.Date;
import java.util.Enumeration;

import sun.security.util.*;

/**
 * This class defines the Private Key Usage Extension.
 *
 * <p>The Private Key Usage Period extension allows the certificate issuer
 * to specify a different validity period for the private key than the
 * certificate. This extension is intended for use with digital
 * signature keys.  This extension consists of two optional components
 * notBefore and notAfter.  The private key associated with the
 * certificate should not be used to sign objects before or after the
 * times specified by the two components, respectively.
 *
 * <pre>
 * PrivateKeyUsagePeriod ::= SEQUENCE {
 *     notBefore  [0]  GeneralizedTime OPTIONAL,
 *     notAfter   [1]  GeneralizedTime OPTIONAL }
 * </pre>
 *
 * @author Amit Kapoor
 * @author Hemma Prafullchandra
 * @see Extension
 * @see CertAttrSet
 */
public class PrivateKeyUsageExtension extends Extension
implements CertAttrSet<String> {
    /**
     * Identifier for this attribute, to be used with the
     * get, set, delete methods of Certificate, x509 type.
     */
    public static final String IDENT = "x509.info.extensions.PrivateKeyUsage";
    /**
     * Sub attributes name for this CertAttrSet.
     */
    public static final String NAME = "PrivateKeyUsage";
    public static final String NOT_BEFORE = "not_before";
    public static final String NOT_AFTER = "not_after";

    // Private data members
    private static final byte TAG_BEFORE = 0;
    private static final byte TAG_AFTER = 1;

    private Date        notBefore = null;
    private Date        notAfter = null;

    // Encode this extension value.
    private void encodeThis() throws IOException {
        if (notBefore == null && notAfter == null) {
            this.extensionValue = null;
            return;
        }
        DerOutputStream seq = new DerOutputStream();

        DerOutputStream tagged = new DerOutputStream();
        if (notBefore != null) {
            DerOutputStream tmp = new DerOutputStream();
            tmp.putGeneralizedTime(notBefore);
            tagged.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
                                 false, TAG_BEFORE), tmp);
        }
        if (notAfter != null) {
            DerOutputStream tmp = new DerOutputStream();
            tmp.putGeneralizedTime(notAfter);
            tagged.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
                                 false, TAG_AFTER), tmp);
        }
        seq.write(DerValue.tag_Sequence, tagged);
        this.extensionValue = seq.toByteArray();
    }

    /**
     * The default constructor for PrivateKeyUsageExtension.
     *
     * @param notBefore the date/time before which the private key
     *         should not be used.
     * @param notAfter the date/time after which the private key
     *         should not be used.
     */
    public PrivateKeyUsageExtension(Date notBefore, Date notAfter)
    throws IOException {
        this.notBefore = notBefore;
        this.notAfter = notAfter;

        this.extensionId = PKIXExtensions.PrivateKeyUsage_Id;
        this.critical = false;
        encodeThis();
    }

    /**
     * Create the extension from the passed DER encoded value.
     *
     * @param critical true if the extension is to be treated as critical.
     * @param value an array of DER encoded bytes of the actual value.
     * @exception ClassCastException if value is not an array of bytes
     * @exception CertificateException on certificate parsing errors.
     * @exception IOException on error.
     */
    public PrivateKeyUsageExtension(Boolean critical, Object value)
    throws CertificateException, IOException {
        this.extensionId = PKIXExtensions.PrivateKeyUsage_Id;
        this.critical = critical.booleanValue();

        this.extensionValue = (byte[]) value;
        DerInputStream str = new DerInputStream(this.extensionValue);
        DerValue[] seq = str.getSequence(2);

        // NB. this is always encoded with the IMPLICIT tag
        // The checks only make sense if we assume implicit tagging,
        // with explicit tagging the form is always constructed.
        for (int i = 0; i < seq.length; i++) {
            DerValue opt = seq[i];

            if (opt.isContextSpecific(TAG_BEFORE) &&
                !opt.isConstructed()) {
                if (notBefore != null) {
                    throw new CertificateParsingException(
                        "Duplicate notBefore in PrivateKeyUsage.");
                }
                opt.resetTag(DerValue.tag_GeneralizedTime);
                str = new DerInputStream(opt.toByteArray());
                notBefore = str.getGeneralizedTime();

            } else if (opt.isContextSpecific(TAG_AFTER) &&
                       !opt.isConstructed()) {
                if (notAfter != null) {
                    throw new CertificateParsingException(
                        "Duplicate notAfter in PrivateKeyUsage.");
                }
                opt.resetTag(DerValue.tag_GeneralizedTime);
                str = new DerInputStream(opt.toByteArray());
                notAfter = str.getGeneralizedTime();
            } else
                throw new IOException("Invalid encoding of " +
                                      "PrivateKeyUsageExtension");
        }
    }

    /**
     * Return the printable string.
     */
    public String toString() {
        return(super.toString() +
                "PrivateKeyUsage: [\n" +
                ((notBefore == null) ? "" : "From: " + notBefore.toString() + ", ")
                + ((notAfter == null) ? "" : "To: " + notAfter.toString())
                + "]\n");
    }

    /**
     * Verify that that the current time is within the validity period.
     *
     * @exception CertificateExpiredException if the certificate has expired.
     * @exception CertificateNotYetValidException if the certificate is not
     * yet valid.
     */
    public void valid()
    throws CertificateNotYetValidException, CertificateExpiredException {
        Date now = new Date();
        valid(now);
    }

    /**
     * Verify that that the passed time is within the validity period.
     *
     * @exception CertificateExpiredException if the certificate has expired
     * with respect to the <code>Date supplied.
     * @exception CertificateNotYetValidException if the certificate is not
     * yet valid with respect to the <code>Date supplied.
     *
     */
    public void valid(Date now)
    throws CertificateNotYetValidException, CertificateExpiredException {
        /*
         * we use the internal Dates rather than the passed in Date
         * because someone could override the Date methods after()
         * and before() to do something entirely different.
         */
        if (notBefore.after(now)) {
            throw new CertificateNotYetValidException("NotBefore: " +
                                                      notBefore.toString());
        }
        if (notAfter.before(now)) {
            throw new CertificateExpiredException("NotAfter: " +
                                                  notAfter.toString());
        }
    }

    /**
     * Write the extension to the OutputStream.
     *
     * @param out the OutputStream to write the extension to.
     * @exception IOException on encoding errors.
     */
    public void encode(OutputStream out) throws IOException {
        DerOutputStream tmp = new DerOutputStream();
        if (extensionValue == null) {
            extensionId = PKIXExtensions.PrivateKeyUsage_Id;
            critical = false;
            encodeThis();
        }
        super.encode(tmp);
        out.write(tmp.toByteArray());
    }

    /**
     * Set the attribute value.
     * @exception CertificateException on attribute handling errors.
     */
    public void set(String name, Object obj)
    throws CertificateException, IOException {
        if (!(obj instanceof Date)) {
            throw new CertificateException("Attribute must be of type Date.");
        }
        if (name.equalsIgnoreCase(NOT_BEFORE)) {
            notBefore = (Date)obj;
        } else if (name.equalsIgnoreCase(NOT_AFTER)) {
            notAfter = (Date)obj;
        } else {
          throw new CertificateException("Attribute name not recognized by"
                           + " CertAttrSet:PrivateKeyUsage.");
        }
        encodeThis();
    }

    /**
     * Get the attribute value.
     * @exception CertificateException on attribute handling errors.
     */
    public Date get(String name) throws CertificateException {
      if (name.equalsIgnoreCase(NOT_BEFORE)) {
          return (new Date(notBefore.getTime()));
      } else if (name.equalsIgnoreCase(NOT_AFTER)) {
          return (new Date(notAfter.getTime()));
      } else {
          throw new CertificateException("Attribute name not recognized by"
                           + " CertAttrSet:PrivateKeyUsage.");
      }
  }

    /**
     * Delete the attribute value.
     * @exception CertificateException on attribute handling errors.
     */
    public void delete(String name) throws CertificateException, IOException {
        if (name.equalsIgnoreCase(NOT_BEFORE)) {
            notBefore = null;
        } else if (name.equalsIgnoreCase(NOT_AFTER)) {
            notAfter = null;
        } else {
          throw new CertificateException("Attribute name not recognized by"
                           + " CertAttrSet:PrivateKeyUsage.");
        }
        encodeThis();
    }

    /**
     * Return an enumeration of names of attributes existing within this
     * attribute.
     */
    public Enumeration<String> getElements() {
        AttributeNameEnumeration elements = new AttributeNameEnumeration();
        elements.addElement(NOT_BEFORE);
        elements.addElement(NOT_AFTER);

        return(elements.elements());
    }

    /**
     * Return the name of this attribute.
     */
    public String getName() {
      return(NAME);
    }
}

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