org.ietf.jgss.Oid Maven / Gradle / Ivy
/*
* Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package org.ietf.jgss;
import java.io.InputStream;
import java.io.IOException;
import sun.security.util.DerValue;
import sun.security.util.DerOutputStream;
import sun.security.util.ObjectIdentifier;
/**
* This class represents Universal Object Identifiers (Oids) and their
* associated operations.
*
* Oids are hierarchically globally-interpretable identifiers used
* within the GSS-API framework to identify mechanisms and name formats.
*
* The structure and encoding of Oids is defined in ISOIEC-8824 and
* ISOIEC-8825. For example the Oid representation of Kerberos V5
* mechanism is "1.2.840.113554.1.2.2"
*
* The GSSName name class contains public static Oid objects
* representing the standard name types defined in GSS-API.
*
* @author Mayank Upadhyay
* @since GSS 1.4
*/
public class Oid {
private ObjectIdentifier oid;
private byte[] derEncoding;
/**
* Constructs an Oid object from a string representation of its
* integer components.
*
* @param strOid the dot separated string representation of the oid.
* For instance, "1.2.840.113554.1.2.2".
* @exception GSSException may be thrown when the string is incorrectly
* formatted
*/
public Oid(String strOid) throws GSSException {
try {
oid = new ObjectIdentifier(strOid);
derEncoding = null;
} catch (Exception e) {
throw new GSSException(GSSException.FAILURE,
"Improperly formatted Object Identifier String - "
+ strOid);
}
}
/**
* Creates an Oid object from its ASN.1 DER encoding. This refers to
* the full encoding including tag and length. The structure and
* encoding of Oids is defined in ISOIEC-8824 and ISOIEC-8825. This
* method is identical in functionality to its byte array counterpart.
*
* @param derOid stream containing the DER encoded oid
* @exception GSSException may be thrown when the DER encoding does not
* follow the prescribed format.
*/
public Oid(InputStream derOid) throws GSSException {
try {
DerValue derVal = new DerValue(derOid);
derEncoding = derVal.toByteArray();
oid = derVal.getOID();
} catch (IOException e) {
throw new GSSException(GSSException.FAILURE,
"Improperly formatted ASN.1 DER encoding for Oid");
}
}
/**
* Creates an Oid object from its ASN.1 DER encoding. This refers to
* the full encoding including tag and length. The structure and
* encoding of Oids is defined in ISOIEC-8824 and ISOIEC-8825. This
* method is identical in functionality to its InputStream conterpart.
*
* @param data byte array containing the DER encoded oid
* @exception GSSException may be thrown when the DER encoding does not
* follow the prescribed format.
*/
public Oid(byte [] data) throws GSSException {
try {
DerValue derVal = new DerValue(data);
derEncoding = derVal.toByteArray();
oid = derVal.getOID();
} catch (IOException e) {
throw new GSSException(GSSException.FAILURE,
"Improperly formatted ASN.1 DER encoding for Oid");
}
}
/**
* Only for calling by initializators used with declarations.
*
* @param strOid
*/
static Oid getInstance(String strOid) {
Oid retVal = null;
try {
retVal = new Oid(strOid);
} catch (GSSException e) {
// squelch it!
}
return retVal;
}
/**
* Returns a string representation of the oid's integer components
* in dot separated notation.
*
* @return string representation in the following format: "1.2.3.4.5"
*/
public String toString() {
return oid.toString();
}
/**
* Tests if two Oid objects represent the same Object identifier
* value.
*
* @return true if the two Oid objects represent the same
* value, false otherwise.
* @param other the Oid object that has to be compared to this one
*/
@SuppressWarnings("deprecation")
public boolean equals(Object other) {
//check if both reference the same object
if (this == other)
return (true);
if (other instanceof Oid)
return this.oid.equals(((Oid) other).oid);
else if (other instanceof ObjectIdentifier)
return this.oid.equals(other);
else
return false;
}
/**
* Returns the full ASN.1 DER encoding for this oid object, which
* includes the tag and length.
*
* @return byte array containing the DER encoding of this oid object.
* @exception GSSException may be thrown when the oid can't be encoded
*/
@SuppressWarnings("resource")
public byte[] getDER() throws GSSException {
if (derEncoding == null) {
DerOutputStream dout = new DerOutputStream();
try {
dout.putOID(oid);
} catch (IOException e) {
throw new GSSException(GSSException.FAILURE, e.getMessage());
}
derEncoding = dout.toByteArray();
}
return (byte[])derEncoding.clone();
}
/**
* A utility method to test if this Oid value is contained within the
* supplied Oid array.
*
* @param oids the array of Oid's to search
* @return true if the array contains this Oid value, false otherwise
*/
public boolean containedIn(Oid[] oids) {
for (int i = 0; i < oids.length; i++) {
if (oids[i].equals(this))
return (true);
}
return (false);
}
/**
* Returns a hashcode value for this Oid.
*
* @return a hashCode value
*/
public int hashCode() {
return oid.hashCode();
}
}