/*
* 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.math.BigInteger;
import java.util.Enumeration;
import sun.security.util.*;
/**
* Represent the CRL Number Extension.
*
* <p>This extension, if present, conveys a monotonically increasing
* sequence number for each CRL issued by a given CA through a specific
* CA X.500 Directory entry or CRL distribution point. This extension
* allows users to easily determine when a particular CRL supersedes
* another CRL.
*
* @author Hemma Prafullchandra
* @see Extension
* @see CertAttrSet
*/
public class CRLNumberExtension extends Extension
implements CertAttrSet<String> {
/**
* Attribute name.
*/
public static final String NAME = "CRLNumber";
public static final String NUMBER = "value";
private static final String LABEL = "CRL Number";
private BigInteger crlNumber = null;
private String extensionName;
private String extensionLabel;
// Encode this extension value
private void encodeThis() throws IOException {
if (crlNumber == null) {
this.extensionValue = null;
return;
}
DerOutputStream os = new DerOutputStream();
os.putInteger(this.crlNumber);
this.extensionValue = os.toByteArray();
}
/**
* Create a CRLNumberExtension with the integer value .
* The criticality is set to false.
*
* @param crlNum the value to be set for the extension.
*/
public CRLNumberExtension(int crlNum) throws IOException {
this(PKIXExtensions.CRLNumber_Id, false, BigInteger.valueOf(crlNum),
NAME, LABEL);
}
/**
* Create a CRLNumberExtension with the BigInteger value .
* The criticality is set to false.
*
* @param crlNum the value to be set for the extension.
*/
public CRLNumberExtension(BigInteger crlNum) throws IOException {
this(PKIXExtensions.CRLNumber_Id, false, crlNum, NAME, LABEL);
}
/**
* Creates the extension (also called by the subclass).
*/
protected CRLNumberExtension(ObjectIdentifier extensionId,
boolean isCritical, BigInteger crlNum, String extensionName,
String extensionLabel) throws IOException {
this.extensionId = extensionId;
this.critical = isCritical;
this.crlNumber = crlNum;
this.extensionName = extensionName;
this.extensionLabel = extensionLabel;
encodeThis();
}
/**
* Create the extension from the passed DER encoded value of the same.
*
* @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 IOException on error.
*/
public CRLNumberExtension(Boolean critical, Object value)
throws IOException {
this(PKIXExtensions.CRLNumber_Id, critical, value, NAME, LABEL);
}
/**
* Creates the extension (also called by the subclass).
*/
protected CRLNumberExtension(ObjectIdentifier extensionId,
Boolean critical, Object value, String extensionName,
String extensionLabel) throws IOException {
this.extensionId = extensionId;
this.critical = critical.booleanValue();
this.extensionValue = (byte[]) value;
DerValue val = new DerValue(this.extensionValue);
this.crlNumber = val.getBigInteger();
this.extensionName = extensionName;
this.extensionLabel = extensionLabel;
}
/**
* Set the attribute value.
*/
public void set(String name, Object obj) throws IOException {
if (name.equalsIgnoreCase(NUMBER)) {
if (!(obj instanceof BigInteger)) {
throw new IOException("Attribute must be of type BigInteger.");
}
crlNumber = (BigInteger)obj;
} else {
throw new IOException("Attribute name not recognized by"
+ " CertAttrSet:" + extensionName + ".");
}
encodeThis();
}
/**
* Get the attribute value.
*/
public Object get(String name) throws IOException {
if (name.equalsIgnoreCase(NUMBER)) {
if (crlNumber == null) return null;
else return crlNumber;
} else {
throw new IOException("Attribute name not recognized by"
+ " CertAttrSet:" + extensionName + ".");
}
}
/**
* Delete the attribute value.
*/
public void delete(String name) throws IOException {
if (name.equalsIgnoreCase(NUMBER)) {
crlNumber = null;
} else {
throw new IOException("Attribute name not recognized by"
+ " CertAttrSet:" + extensionName + ".");
}
encodeThis();
}
/**
* Returns a printable representation of the CRLNumberExtension.
*/
public String toString() {
String s = super.toString() + extensionLabel + ": " +
((crlNumber == null) ? "" : Debug.toHexString(crlNumber))
+ "\n";
return (s);
}
/**
* Write the extension to the DerOutputStream.
*
* @param out the DerOutputStream to write the extension to.
* @exception IOException on encoding errors.
*/
public void encode(OutputStream out) throws IOException {
DerOutputStream tmp = new DerOutputStream();
encode(out, PKIXExtensions.CRLNumber_Id, true);
}
/**
* Write the extension to the DerOutputStream.
* (Also called by the subclass)
*/
protected void encode(OutputStream out, ObjectIdentifier extensionId,
boolean isCritical) throws IOException {
DerOutputStream tmp = new DerOutputStream();
if (this.extensionValue == null) {
this.extensionId = extensionId;
this.critical = isCritical;
encodeThis();
}
super.encode(tmp);
out.write(tmp.toByteArray());
}
/**
* Return an enumeration of names of attributes existing within this
* attribute.
*/
public Enumeration<String> getElements() {
AttributeNameEnumeration elements = new AttributeNameEnumeration();
elements.addElement(NUMBER);
return (elements.elements());
}
/**
* Return the name of this attribute.
*/
public String getName() {
return (extensionName);
}
}