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package sun.security.x509;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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(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);
    }
}