* 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. * *
* 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
* @version 1.7
* @see Extension
* @see CertAttrSet
*/
public class SubjectKeyIdentifierExtension extends Extension
implements CertAttrSet {
/**
*
*/
private static final long serialVersionUID = 2457721262590880939L;
/**
* 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;
// Encode this extension value
private void encodeThis() throws IOException {
DerOutputStream os = new DerOutputStream();
id.encode(os);
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(boolean critical, byte[] octetString)
throws IOException {
id = new KeyIdentifier(octetString);
this.extensionId = PKIXExtensions.SubjectKey_Id;
this.critical = critical;
encodeThis();
}
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 Array of DER encoded bytes of the actual value.
* @exception IOException on error.
*/
public SubjectKeyIdentifierExtension(Boolean critical, Object value)
throws IOException {
this.extensionId = PKIXExtensions.SubjectKey_Id;
this.critical = critical.booleanValue();
int len = Array.getLength(value);
byte[] extValue = new byte[len];
for (int i = 0; i < len; i++) {
extValue[i] = Array.getByte(value, i);
}
this.extensionValue = extValue;
DerValue val = new DerValue(extValue);
this.id = new KeyIdentifier(val);
}
/**
* Returns a printable representation.
*/
public String toString() {
if (id == null)
return "";
String s = super.toString() + "SubjectKeyIdentifier [\n"
+ id.toString() + "]\n";
return (s);
}
/**
* 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());
}
/**
* Decode the extension from the InputStream.
*
* @param in the InputStream to unmarshal the contents from.
* @exception IOException on decoding or validity errors.
*/
public void decode(InputStream in) throws IOException {
throw new IOException("Method not to be called directly.");
}
/**
* Set the attribute value.
*/
public void set(String name, Object obj) throws IOException {
clearValue();
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.");
}
}
/**
* Get the attribute value.
*/
public Object 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.");
}
}
/**
* Return an enumeration of names of attributes existing within this
* attribute.
*/
public Enumeration