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// --- BEGIN COPYRIGHT BLOCK ---
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This program 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 for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package netscape.security.x509;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Array;
import java.math.BigInteger;
import java.util.Enumeration;
import netscape.security.util.BigInt;
import netscape.security.util.DerOutputStream;
import netscape.security.util.DerValue;
/**
* 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
* @version 1.2
* @see Extension
* @see CertAttrSet
*/
public class CRLNumberExtension extends Extension
implements CertAttrSet {
/**
* Attribute name.
*/
public static final String NAME = "CRLNumber";
public static final String NUMBER = "value";
private BigInt crlNumber = null;
// Encode this extension value
private void encodeThis() throws IOException {
if (crlNumber == null)
throw new IOException("Unintialized CRL number extension");
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.crlNumber = new BigInt(crlNum);
this.extensionId = PKIXExtensions.CRLNumber_Id;
this.critical = false;
encodeThis();
}
/**
* 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.crlNumber = new BigInt(crlNum);
this.extensionId = PKIXExtensions.CRLNumber_Id;
this.critical = false;
encodeThis();
}
/**
* Create a CRLNumberExtension with the BigInteger value .
*
* @param critical true if the extension is to be treated as critical.
* @param crlNum the value to be set for the extension.
*/
public CRLNumberExtension(Boolean critical, BigInteger crlNum) throws IOException {
this.crlNumber = new BigInt(crlNum);
this.extensionId = PKIXExtensions.CRLNumber_Id;
this.critical = critical.booleanValue();
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 Array of DER encoded bytes of the actual value.
* @exception IOException on error.
*/
public CRLNumberExtension(Boolean critical, Object value)
throws IOException {
this.extensionId = PKIXExtensions.CRLNumber_Id;
this.critical = critical.booleanValue();
int len = Array.getLength(value);
byte[] extValue = new byte[len];
for (int i = 0; i < len; i++) {
extValue[i] = Array.getByte(value, i);
}
this.extensionValue = extValue;
DerValue val = new DerValue(extValue);
this.crlNumber = val.getInteger();
}
/**
* 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 = new BigInt((BigInteger)obj);
} else {
throw new IOException("Attribute name not recognized by"
+ " CertAttrSet:CRLNumber.");
}
}
/**
* Get the attribute value.
*/
public Object get(String name) throws IOException {
if (name.equalsIgnoreCase(NUMBER)) {
if (crlNumber == null) return null;
else return crlNumber.toBigInteger();
} else {
throw new IOException("Attribute name not recognized by"
+ " CertAttrSet:CRLNumber.");
}
}
/**
* 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:CRLNumber.");
}
}
/**
* Returns a printable representation of the CRLNumberExtension.
*/
public String toString() {
String s = super.toString() + "CRL Number: " +
((crlNumber == null) ? "" : crlNumber.toString())
+ "\n";
return (s);
}
/**
* Decode the extension from the InputStream.
*
* @param in the InputStream to unmarshal the contents from.
* @exception IOException on decoding or validity errors.
*/
public void decode(InputStream in) throws IOException {
throw new IOException("Method not to be called directly.");
}
/**
* 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();
if (this.extensionValue == null) {
this.extensionId = PKIXExtensions.CRLNumber_Id;
this.critical = false;
encodeThis();
}
super.encode(tmp);
out.write(tmp.toByteArray());
}
/**
* Return an enumeration of names of attributes existing within this
* attribute.
*/
public Enumeration getElements () {
AttributeNameEnumeration elements = new AttributeNameEnumeration();
elements.addElement(NUMBER);
return (elements.elements());
}
/**
* Return the name of this attribute.
*/
public String getName () {
return (NAME);
}
}
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