Package javax.security.auth.x500

Class X500Principal

java.lang.Object

javax.security.auth.x500.X500Principal

All Implemented Interfaces:

Serializable, Principal

public final class X500Principal
extends Object
implements Principal, Serializable

This class represents an X.500 Principal. X500Principals are represented by distinguished names such as "CN=Duke, OU=JavaSoft, O=Sun Microsystems, C=US".

This class can be instantiated by using a string representation of the distinguished name, or by using the ASN.1 DER encoded byte representation of the distinguished name. The current specification for the string representation of a distinguished name is defined in RFC 2253: Lightweight Directory Access Protocol (v3): UTF-8 String Representation of Distinguished Names. This class, however, accepts string formats from both RFC 2253 and RFC 1779: A String Representation of Distinguished Names, and also recognizes attribute type keywords whose OIDs (Object Identifiers) are defined in RFC 3280: Internet X.509 Public Key Infrastructure Certificate and CRL Profile.

The string representation for this X500Principal can be obtained by calling the getName methods.

Note that the getSubjectX500Principal and getIssuerX500Principal methods of X509Certificate return X500Principals representing the issuer and subject fields of the certificate.

Since:

1.4

See Also:

X509Certificate, Serialized Form

Constructor Summary

Constructors

Constructor	Description
X500Principal(byte[] name)	Creates an X500Principal from a distinguished name in ASN.1 DER encoded form.
X500Principal(InputStream is)	Creates an X500Principal from an InputStream containing the distinguished name in ASN.1 DER encoded form.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)	Compares the specified Object with this X500Principal for equality.
String	getName()	Returns a string representation of the X.500 distinguished name.
int	hashCode()	Return a hash code for this X500Principal.

Methods inherited from class java.lang.Object

clone, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.security.Principal

toString

Constructor Detail

X500Principal

public X500Principal(byte[] name)

Creates an X500Principal from a distinguished name in ASN.1 DER encoded form. The ASN.1 notation for this structure is as follows.

 
 Name ::= CHOICE {
   RDNSequence }

 RDNSequence ::= SEQUENCE OF RelativeDistinguishedName

 RelativeDistinguishedName ::=
   SET SIZE (1 .. MAX) OF AttributeTypeAndValue

 AttributeTypeAndValue ::= SEQUENCE {
   type     AttributeType,
   value    AttributeValue }

 AttributeType ::= OBJECT IDENTIFIER

 AttributeValue ::= ANY DEFINED BY AttributeType
 ....
 DirectoryString ::= CHOICE {
       teletexString           TeletexString (SIZE (1..MAX)),
       printableString         PrintableString (SIZE (1..MAX)),
       universalString         UniversalString (SIZE (1..MAX)),
       utf8String              UTF8String (SIZE (1.. MAX)),
       bmpString               BMPString (SIZE (1..MAX)) }
 
 

Parameters:

name - a byte array containing the distinguished name in ASN.1 DER encoded form

Throws:

IllegalArgumentException - if an encoding error occurs (incorrect form for DN)

X500Principal

public X500Principal(InputStream is)

Creates an X500Principal from an InputStream containing the distinguished name in ASN.1 DER encoded form. The ASN.1 notation for this structure is supplied in the documentation for X500Principal(byte[] name).

The read position of the input stream is positioned to the next available byte after the encoded distinguished name.

Parameters:

is - an InputStream containing the distinguished name in ASN.1 DER encoded form

Throws:

NullPointerException - if the InputStream is null

IllegalArgumentException - if an encoding error occurs (incorrect form for DN)

Method Detail

getName

public String getName()

Returns a string representation of the X.500 distinguished name.

The chosen format is a '#' character followed by the hexadecimal encoding of de DER representation of the name. (No spaces between digits, letters in lower case).

Returns:

the distinguished name of this X500Principal

equals

public boolean equals(@Nullable
                      Object o)

Compares the specified Object with this X500Principal for equality.

Specifically, this method returns true if the Object o is an X500Principal and if the respective canonical string representations (obtained via the getName(X500Principal.CANONICAL) method) of this object and o are equal.

This implementation is compliant with the requirements of RFC 3280.

Specified by:

equals in interface Principal

Overrides:

equals in class Object

Parameters:

o - Object to be compared for equality with this X500Principal

Returns:

true if the specified Object is equal to this X500Principal, false otherwise

See Also:

Object.hashCode(), HashMap

hashCode

public int hashCode()

Return a hash code for this X500Principal.

The hash code is calculated via: getName(X500Principal.CANONICAL).hashCode()

Specified by:

hashCode in interface Principal

Overrides:

hashCode in class Object

Returns:

a hash code for this X500Principal

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)