/* * Copyright (c) 1997, 2006, 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 Extensionimplements 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</code> supplied.     * @exception CertificateNotYetValidException if the certificate is not     * yet valid with respect to the <code>Date</code> 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 Object 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);    }}