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package sun.security.x509;

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

import sun.security.util.*;

This represents the Issuer Alternative Name Extension. This extension, if present, allows the issuer to specify multiple alternative names.

Extensions are represented as a sequence of the extension identifier (Object Identifier), a boolean flag stating whether the extension is to be treated as being critical and the extension value itself (this is again a DER encoding of the extension value).

Author:Amit Kapoor, Hemma Prafullchandra
See Also:
/** * This represents the Issuer Alternative Name Extension. * * This extension, if present, allows the issuer to specify multiple * alternative names. * * <p>Extensions are represented as a sequence of the extension identifier * (Object Identifier), a boolean flag stating whether the extension is to * be treated as being critical and the extension value itself (this is again * a DER encoding of the extension value). * * @author Amit Kapoor * @author Hemma Prafullchandra * @see Extension * @see CertAttrSet */
public class IssuerAlternativeNameExtension 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.IssuerAlternativeName";
Attribute names.
/** * Attribute names. */
public static final String NAME = "IssuerAlternativeName"; public static final String ISSUER_NAME = "issuer_name"; // private data members GeneralNames names = null; // Encode this extension private void encodeThis() throws IOException { if (names == null || names.isEmpty()) { this.extensionValue = null; return; } DerOutputStream os = new DerOutputStream(); names.encode(os); this.extensionValue = os.toByteArray(); }
Create a IssuerAlternativeNameExtension with the passed GeneralNames.
Params:
  • names – the GeneralNames for the issuer.
Throws:
/** * Create a IssuerAlternativeNameExtension with the passed GeneralNames. * * @param names the GeneralNames for the issuer. * @exception IOException on error. */
public IssuerAlternativeNameExtension(GeneralNames names) throws IOException { this.names = names; this.extensionId = PKIXExtensions.IssuerAlternativeName_Id; this.critical = false; encodeThis(); }
Create a IssuerAlternativeNameExtension with the passed criticality and GeneralNames.
Params:
  • critical – true if the extension is to be treated as critical.
  • names – the GeneralNames for the issuer.
Throws:
/** * Create a IssuerAlternativeNameExtension with the passed criticality * and GeneralNames. * * @param critical true if the extension is to be treated as critical. * @param names the GeneralNames for the issuer. * @exception IOException on error. */
public IssuerAlternativeNameExtension(Boolean critical, GeneralNames names) throws IOException { this.names = names; this.extensionId = PKIXExtensions.IssuerAlternativeName_Id; this.critical = critical.booleanValue(); encodeThis(); }
Create a default IssuerAlternativeNameExtension.
/** * Create a default IssuerAlternativeNameExtension. */
public IssuerAlternativeNameExtension() { extensionId = PKIXExtensions.IssuerAlternativeName_Id; critical = false; names = new GeneralNames(); }
Create the extension from the passed DER encoded value.
Params:
  • critical – true if the extension is to be treated as critical.
  • value – an array of DER encoded bytes of the actual value.
Throws:
/** * Create the extension from the passed DER encoded value. * * @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 IssuerAlternativeNameExtension(Boolean critical, Object value) throws IOException { this.extensionId = PKIXExtensions.IssuerAlternativeName_Id; this.critical = critical.booleanValue(); this.extensionValue = (byte[]) value; DerValue val = new DerValue(this.extensionValue); if (val.data == null) { names = new GeneralNames(); return; } names = new GeneralNames(val); }
Returns a printable representation of the IssuerAlternativeName.
/** * Returns a printable representation of the IssuerAlternativeName. */
public String toString() { StringBuilder sb = new StringBuilder(); sb.append(super.toString()) .append("IssuerAlternativeName [\n"); if (names == null) { sb.append(" null\n"); } else { for (GeneralName name : names.names()) { sb.append(" ") .append(name) .append('\n'); } } sb.append("]\n"); return sb.toString(); }
Write the extension to the OutputStream.
Params:
  • out – the OutputStream to write the extension to.
Throws:
/** * Write the extension to the OutputStream. * * @param out the OutputStream to write the extension to. * @exception IOException on encoding error. */
public void encode(OutputStream out) throws IOException { DerOutputStream tmp = new DerOutputStream(); if (extensionValue == null) { extensionId = PKIXExtensions.IssuerAlternativeName_Id; critical = false; encodeThis(); } super.encode(tmp); out.write(tmp.toByteArray()); }
Set the attribute value.
/** * Set the attribute value. */
public void set(String name, Object obj) throws IOException { if (name.equalsIgnoreCase(ISSUER_NAME)) { if (!(obj instanceof GeneralNames)) { throw new IOException("Attribute value should be of" + " type GeneralNames."); } names = (GeneralNames)obj; } else { throw new IOException("Attribute name not recognized by " + "CertAttrSet:IssuerAlternativeName."); } encodeThis(); }
Get the attribute value.
/** * Get the attribute value. */
public GeneralNames get(String name) throws IOException { if (name.equalsIgnoreCase(ISSUER_NAME)) { return (names); } else { throw new IOException("Attribute name not recognized by " + "CertAttrSet:IssuerAlternativeName."); } }
Delete the attribute value.
/** * Delete the attribute value. */
public void delete(String name) throws IOException { if (name.equalsIgnoreCase(ISSUER_NAME)) { names = null; } else { throw new IOException("Attribute name not recognized by " + "CertAttrSet:IssuerAlternativeName."); } 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(ISSUER_NAME); return (elements.elements()); }
Return the name of this attribute.
/** * Return the name of this attribute. */
public String getName() { return (NAME); } }