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/*
* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.security.x509;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Enumeration;
import sun.security.util.*;
/**
* Represent the Subject Key Identifier Extension.
*
* This extension, if present, provides a means of identifying the particular
* public key used in an application. This extension by default is marked
* non-critical.
*
* <p>Extensions are addiitonal attributes which can be inserted in a X509
* v3 certificate. For example a "Driving License Certificate" could have
* the driving license number as a extension.
*
* <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 SubjectKeyIdentifierExtension extends Extension
implements CertAttrSet<String> {
/**
* 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.SubjectKeyIdentifier";
/**
* Attribute names.
*/
public static final String NAME = "SubjectKeyIdentifier";
public static final String KEY_ID = "key_id";
// Private data member
private KeyIdentifier id = null;
// Encode this extension value
private void encodeThis() throws IOException {
if (id == null) {
this.extensionValue = null;
return;
}
DerOutputStream os = new DerOutputStream();
id.encode(os);
this.extensionValue = os.toByteArray();
}
/**
* Create a SubjectKeyIdentifierExtension with the passed octet string.
* The criticality is set to False.
* @param octetString the octet string identifying the key identifier.
*/
public SubjectKeyIdentifierExtension(byte[] octetString)
throws IOException {
id = new KeyIdentifier(octetString);
this.extensionId = PKIXExtensions.SubjectKey_Id;
this.critical = false;
encodeThis();
}
/**
* 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 SubjectKeyIdentifierExtension(Boolean critical, Object value)
throws IOException {
this.extensionId = PKIXExtensions.SubjectKey_Id;
this.critical = critical.booleanValue();
this.extensionValue = (byte[]) value;
DerValue val = new DerValue(this.extensionValue);
this.id = new KeyIdentifier(val);
}
/**
* Returns a printable representation.
*/
public String toString() {
return super.toString() + "SubjectKeyIdentifier [\n"
+ String.valueOf(id) + "]\n";
}
/**
* Write the extension to the OutputStream.
*
* @param out the OutputStream to write the extension to.
* @exception IOException on encoding errors.
*/
public void encode(OutputStream out) throws IOException {
DerOutputStream tmp = new DerOutputStream();
if (extensionValue == null) {
extensionId = PKIXExtensions.SubjectKey_Id;
critical = false;
encodeThis();
}
super.encode(tmp);
out.write(tmp.toByteArray());
}
/**
* Set the attribute value.
*/
public void set(String name, Object obj) throws IOException {
if (name.equalsIgnoreCase(KEY_ID)) {
if (!(obj instanceof KeyIdentifier)) {
throw new IOException("Attribute value should be of" +
" type KeyIdentifier.");
}
id = (KeyIdentifier)obj;
} else {
throw new IOException("Attribute name not recognized by " +
"CertAttrSet:SubjectKeyIdentifierExtension.");
}
encodeThis();
}
/**
* Get the attribute value.
*/
public KeyIdentifier get(String name) throws IOException {
if (name.equalsIgnoreCase(KEY_ID)) {
return (id);
} else {
throw new IOException("Attribute name not recognized by " +
"CertAttrSet:SubjectKeyIdentifierExtension.");
}
}
/**
* Delete the attribute value.
*/
public void delete(String name) throws IOException {
if (name.equalsIgnoreCase(KEY_ID)) {
id = null;
} else {
throw new IOException("Attribute name not recognized by " +
"CertAttrSet:SubjectKeyIdentifierExtension.");
}
encodeThis();
}
/**
* Return an enumeration of names of attributes existing within this
* attribute.
*/
public Enumeration<String> getElements() {
AttributeNameEnumeration elements = new AttributeNameEnumeration();
elements.addElement(KEY_ID);
return (elements.elements());
}
/**
* Return the name of this attribute.
*/
public String getName() {
return (NAME);
}
}
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