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package sun.security.x509;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;
import java.util.Enumeration;

import sun.security.util.*;

This class defines the version of the X509 Certificate.
Author:Amit Kapoor, Hemma Prafullchandra
See Also:
/** * This class defines the version of the X509 Certificate. * * @author Amit Kapoor * @author Hemma Prafullchandra * @see CertAttrSet */
public class CertificateVersion implements CertAttrSet<String> {
X509Certificate Version 1
/** * X509Certificate Version 1 */
public static final int V1 = 0;
X509Certificate Version 2
/** * X509Certificate Version 2 */
public static final int V2 = 1;
X509Certificate Version 3
/** * X509Certificate Version 3 */
public static final int V3 = 2;
Identifier for this attribute, to be used with the get, set, delete methods of Certificate, x509 type.
/** * Identifier for this attribute, to be used with the * get, set, delete methods of Certificate, x509 type. */
public static final String IDENT = "x509.info.version";
Sub attributes name for this CertAttrSet.
/** * Sub attributes name for this CertAttrSet. */
public static final String NAME = "version"; public static final String VERSION = "number"; // Private data members int version = V1; // Returns the version number. private int getVersion() { return(version); } // Construct the class from the passed DerValue private void construct(DerValue derVal) throws IOException { if (derVal.isConstructed() && derVal.isContextSpecific()) { derVal = derVal.data.getDerValue(); version = derVal.getInteger(); if (derVal.data.available() != 0) { throw new IOException("X.509 version, bad format"); } } }
The default constructor for this class, sets the version to 0 (i.e. X.509 version 1).
/** * The default constructor for this class, * sets the version to 0 (i.e. X.509 version 1). */
public CertificateVersion() { version = V1; }
The constructor for this class for the required version.
Params:
  • version – the version for the certificate.
Throws:
/** * The constructor for this class for the required version. * * @param version the version for the certificate. * @exception IOException if the version is not valid. */
public CertificateVersion(int version) throws IOException { // check that it is a valid version if (version == V1 || version == V2 || version == V3) this.version = version; else { throw new IOException("X.509 Certificate version " + version + " not supported.\n"); } }
Create the object, decoding the values from the passed DER stream.
Params:
  • in – the DerInputStream to read the CertificateVersion from.
Throws:
/** * Create the object, decoding the values from the passed DER stream. * * @param in the DerInputStream to read the CertificateVersion from. * @exception IOException on decoding errors. */
public CertificateVersion(DerInputStream in) throws IOException { version = V1; DerValue derVal = in.getDerValue(); construct(derVal); }
Create the object, decoding the values from the passed stream.
Params:
  • in – the InputStream to read the CertificateVersion from.
Throws:
/** * Create the object, decoding the values from the passed stream. * * @param in the InputStream to read the CertificateVersion from. * @exception IOException on decoding errors. */
public CertificateVersion(InputStream in) throws IOException { version = V1; DerValue derVal = new DerValue(in); construct(derVal); }
Create the object, decoding the values from the passed DerValue.
Params:
  • val – the Der encoded value.
Throws:
/** * Create the object, decoding the values from the passed DerValue. * * @param val the Der encoded value. * @exception IOException on decoding errors. */
public CertificateVersion(DerValue val) throws IOException { version = V1; construct(val); }
Return the version number of the certificate.
/** * Return the version number of the certificate. */
public String toString() { return("Version: V" + (version+1)); }
Encode the CertificateVersion period in DER form to the stream.
Params:
  • out – the OutputStream to marshal the contents to.
Throws:
/** * Encode the CertificateVersion period in DER form to the stream. * * @param out the OutputStream to marshal the contents to. * @exception IOException on errors. */
public void encode(OutputStream out) throws IOException { // Nothing for default if (version == V1) { return; } DerOutputStream tmp = new DerOutputStream(); tmp.putInteger(version); DerOutputStream seq = new DerOutputStream(); seq.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0), tmp); out.write(seq.toByteArray()); }
Set the attribute value.
/** * Set the attribute value. */
public void set(String name, Object obj) throws IOException { if (!(obj instanceof Integer)) { throw new IOException("Attribute must be of type Integer."); } if (name.equalsIgnoreCase(VERSION)) { version = ((Integer)obj).intValue(); } else { throw new IOException("Attribute name not recognized by " + "CertAttrSet: CertificateVersion."); } }
Get the attribute value.
/** * Get the attribute value. */
public Integer get(String name) throws IOException { if (name.equalsIgnoreCase(VERSION)) { return(new Integer(getVersion())); } else { throw new IOException("Attribute name not recognized by " + "CertAttrSet: CertificateVersion."); } }
Delete the attribute value.
/** * Delete the attribute value. */
public void delete(String name) throws IOException { if (name.equalsIgnoreCase(VERSION)) { version = V1; } else { throw new IOException("Attribute name not recognized by " + "CertAttrSet: CertificateVersion."); } }
Return an enumeration of names of attributes existing within this attribute.
/** * Return an enumeration of names of attributes existing within this * attribute. */
public Enumeration<String> getElements() { AttributeNameEnumeration elements = new AttributeNameEnumeration(); elements.addElement(VERSION); return (elements.elements()); }
Return the name of this attribute.
/** * Return the name of this attribute. */
public String getName() { return(NAME); }
Compare versions.
/** * Compare versions. */
public int compare(int vers) { return(version - vers); } }