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package sun.security.x509;

import java.io.IOException;
import java.io.OutputStream;

import java.util.Collections;
import java.util.*;

import sun.security.util.DerOutputStream;
import sun.security.util.DerValue;


The Subject Information Access Extension (OID = 1.3.6.1.5.5.7.1.11).


The subject information access extension indicates how to access
information and services for the subject of the certificate in which
the extension appears.  When the subject is a CA, information and
services may include certificate validation services and CA policy
data.  When the subject is an end entity, the information describes
the type of services offered and how to access them.  In this case,
the contents of this extension are defined in the protocol
specifications for the supported services.  This extension may be
included in end entity or CA certificates.  Conforming CAs MUST mark
this extension as non-critical.


This extension is defined in 
Internet X.509 PKI Certificate and Certificate Revocation List
(CRL) Profile. The profile permits
the extension to be included in end-entity or CA certificates,
and it must be marked as non-critical. Its ASN.1 definition is as follows:

  id-pe-subjectInfoAccess OBJECT IDENTIFIER ::= { id-pe 11 }
  SubjectInfoAccessSyntax  ::=
         SEQUENCE SIZE (1..MAX) OF AccessDescription
  AccessDescription  ::=  SEQUENCE {
         accessMethod          OBJECT IDENTIFIER,
         accessLocation        GeneralName  }



See Also:
/**
 * The Subject Information Access Extension (OID = 1.3.6.1.5.5.7.1.11).
 * <p>
 * The subject information access extension indicates how to access
 * information and services for the subject of the certificate in which
 * the extension appears.  When the subject is a CA, information and
 * services may include certificate validation services and CA policy
 * data.  When the subject is an end entity, the information describes
 * the type of services offered and how to access them.  In this case,
 * the contents of this extension are defined in the protocol
 * specifications for the supported services.  This extension may be
 * included in end entity or CA certificates.  Conforming CAs MUST mark
 * this extension as non-critical.
 * <p>
 * This extension is defined in <a href="http://tools.ietf.org/html/rfc5280">
 * Internet X.509 PKI Certificate and Certificate Revocation List
 * (CRL) Profile</a>. The profile permits
 * the extension to be included in end-entity or CA certificates,
 * and it must be marked as non-critical. Its ASN.1 definition is as follows:
 * <pre>
 *   id-pe-subjectInfoAccess OBJECT IDENTIFIER ::= { id-pe 11 }
 *
 *   SubjectInfoAccessSyntax  ::=
 *          SEQUENCE SIZE (1..MAX) OF AccessDescription
 *
 *   AccessDescription  ::=  SEQUENCE {
 *          accessMethod          OBJECT IDENTIFIER,
 *          accessLocation        GeneralName  }
 * </pre>
 *
 * @see Extension
 * @see CertAttrSet
 */

public class SubjectInfoAccessExtension extends Extension
        implements CertAttrSet<String> {

    
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.extensions.SubjectInfoAccess";

    
Attribute name.

/**
     * Attribute name.
     */
    public static final String NAME = "SubjectInfoAccess";
    public static final String DESCRIPTIONS = "descriptions";

    
The List of AccessDescription objects.

/**
     * The List of AccessDescription objects.
     */
    private List<AccessDescription> accessDescriptions;

    
Create an SubjectInfoAccessExtension from a List of
AccessDescription; the criticality is set to false.

Params:
  • accessDescriptions – the List of AccessDescription
Throws:
/**
     * Create an SubjectInfoAccessExtension from a List of
     * AccessDescription; the criticality is set to false.
     *
     * @param accessDescriptions the List of AccessDescription
     * @throws IOException on error
     */
    public SubjectInfoAccessExtension(
            List<AccessDescription> accessDescriptions) throws IOException {
        this.extensionId = PKIXExtensions.SubjectInfoAccess_Id;
        this.critical = false;
        this.accessDescriptions = accessDescriptions;
        encodeThis();
    }

    
Create the extension from the passed DER encoded value of the same.

Params:
  • critical – true if the extension is to be treated as critical.
  • value – Array of DER encoded bytes of the actual value.
Throws:
/**
     * 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 SubjectInfoAccessExtension(Boolean critical, Object value)
            throws IOException {
        this.extensionId = PKIXExtensions.SubjectInfoAccess_Id;
        this.critical = critical.booleanValue();

        if (!(value instanceof byte[])) {
            throw new IOException("Illegal argument type");
        }

        extensionValue = (byte[])value;
        DerValue val = new DerValue(extensionValue);
        if (val.tag != DerValue.tag_Sequence) {
            throw new IOException("Invalid encoding for " +
                                  "SubjectInfoAccessExtension.");
        }
        accessDescriptions = new ArrayList<AccessDescription>();
        while (val.data.available() != 0) {
            DerValue seq = val.data.getDerValue();
            AccessDescription accessDescription = new AccessDescription(seq);
            accessDescriptions.add(accessDescription);
        }
    }

    
Return the list of AccessDescription objects.

/**
     * Return the list of AccessDescription objects.
     */
    public List<AccessDescription> getAccessDescriptions() {
        return accessDescriptions;
    }

    
Return the name of this attribute.

/**
     * Return the name of this attribute.
     */
    public String getName() {
        return NAME;
    }

    
Write the extension to the DerOutputStream.

Params:
  • out – the DerOutputStream to write the extension to.
Throws:
/**
     * 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.SubjectInfoAccess_Id;
            this.critical = false;
            encodeThis();
        }
        super.encode(tmp);
        out.write(tmp.toByteArray());
    }

    
Set the attribute value.

/**
     * Set the attribute value.
     */
    @SuppressWarnings("unchecked") // Checked with instanceof
    public void set(String name, Object obj) throws IOException {
        if (name.equalsIgnoreCase(DESCRIPTIONS)) {
            if (!(obj instanceof List)) {
                throw new IOException("Attribute value should be of type List.");
            }
            accessDescriptions = (List<AccessDescription>)obj;
        } else {
            throw new IOException("Attribute name [" + name +
                                "] not recognized by " +
                                "CertAttrSet:SubjectInfoAccessExtension.");
        }
        encodeThis();
    }

    
Get the attribute value.

/**
     * Get the attribute value.
     */
    public List<AccessDescription> get(String name) throws IOException {
        if (name.equalsIgnoreCase(DESCRIPTIONS)) {
            return accessDescriptions;
        } else {
            throw new IOException("Attribute name [" + name +
                                "] not recognized by " +
                                "CertAttrSet:SubjectInfoAccessExtension.");
        }
    }

    
Delete the attribute value.

/**
     * Delete the attribute value.
     */
    public void delete(String name) throws IOException {
        if (name.equalsIgnoreCase(DESCRIPTIONS)) {
            accessDescriptions =
                Collections.<AccessDescription>emptyList();
        } else {
            throw new IOException("Attribute name [" + name +
                                "] not recognized by " +
                                "CertAttrSet:SubjectInfoAccessExtension.");
        }
        encodeThis();
    }

    
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(DESCRIPTIONS);
        return elements.elements();
    }

     // Encode this extension value
    private void encodeThis() throws IOException {
        if (accessDescriptions.isEmpty()) {
            this.extensionValue = null;
        } else {
            DerOutputStream ads = new DerOutputStream();
            for (AccessDescription accessDescription : accessDescriptions) {
                accessDescription.encode(ads);
            }
            DerOutputStream seq = new DerOutputStream();
            seq.write(DerValue.tag_Sequence, ads);
            this.extensionValue = seq.toByteArray();
        }
    }

    
Return the extension as user readable string.

/**
     * Return the extension as user readable string.
     */
    public String toString() {
        return super.toString() +
            "SubjectInfoAccess [\n  " + accessDescriptions + "\n]\n";
    }

}