FileDocCategorySizeDatePackage
X500Principal.javaAPI DocJava SE 5 API14107Fri Aug 26 14:57:48 BST 2005javax.security.auth.x500

X500Principal

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. This class, however, accepts string formats from both RFC 2253 and RFC 1779, and also recognizes attribute type keywords whose OIDs (Object Identifiers) are defined in RFC 2459.

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.

version
1.21, 12/19/03
see
java.security.cert.X509Certificate
since
1.4

Fields Summary
private static final long
serialVersionUID
public static final String
RFC1779
RFC 1779 String format of Distinguished Names.
public static final String
RFC2253
RFC 2253 String format of Distinguished Names.
public static final String
CANONICAL
Canonical String format of Distinguished Names.
private transient X500Name
thisX500Name
The X500Name representing this principal. NOTE: this field is reflectively accessed from within X500Name.
Constructors Summary
X500Principal(X500Name x500Name)
Creates an X500Principal by wrapping an X500Name. NOTE: The constructor is package private. It is intended to be accessed using privileged reflection from classes in sun.security.*. Currently referenced from sun.security.x509.X500Name.asX500Principal().

    
                                       
      
        thisX500Name = x500Name;
public X500Principal(String name)
Creates an X500Principal from a string representation of an X.500 distinguished name (ex: "CN=Duke, OU=JavaSoft, O=Sun Microsystems, C=US"). The distinguished name must be specified using the grammar defined in RFC 1779 or RFC 2253 (either format is acceptable).

This constructor recognizes the attribute type keywords defined in RFC 1779 and RFC 2253 (and listed in {@link #getName(String format) getName(String format)}), as well as the T, DNQ or DNQUALIFIER, SURNAME, GIVENNAME, INITIALS, GENERATION, EMAILADDRESS, and SERIALNUMBER keywords whose OIDs are defined in RFC 2459 and its successor. Any other attribute type must be specified as an OID.

param
name an X.500 distinguished name in RFC 1779 or RFC 2253 format
exception
NullPointerException if the name is null
exception
IllegalArgumentException if the name is improperly specified

	if (name == null) {
	    throw new NullPointerException
		(sun.security.util.ResourcesMgr.getString
		("provided null name"));
	}

	try {
	    thisX500Name = new X500Name(name);
	} catch (Exception e) {
	    IllegalArgumentException iae = new IllegalArgumentException
			("improperly specified input name: " + name);
	    iae.initCause(e);
	    throw iae;
	}
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)) }

param
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)

	try {
	    thisX500Name = new X500Name(name);
	} catch (Exception e) {
	    IllegalArgumentException iae = new IllegalArgumentException
			("improperly specified input name");
	    iae.initCause(e);
	    throw iae;
	}
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 {@link #X500Principal(byte[] name) X500Principal(byte[] name)}.

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

param
is an InputStream containing the distinguished name in ASN.1 DER encoded form
exception
NullPointerException if the InputStream is null
exception
IllegalArgumentException if an encoding error occurs (incorrect form for DN)

	if (is == null) {
	    throw new NullPointerException("provided null input stream");
	}

	try {
	    if (is.markSupported())
		is.mark(is.available() + 1);
	    DerValue der = new DerValue(is);
	    thisX500Name = new X500Name(der.data);
	} catch (Exception e) {
	    if (is.markSupported()) {
		try {
		    is.reset();
		} catch (IOException ioe) {
		    IllegalArgumentException iae = new IllegalArgumentException
			("improperly specified input stream " +
			("and unable to reset input stream"));
		    iae.initCause(e);
		    throw iae;
		}
	    }
	    IllegalArgumentException iae = new IllegalArgumentException
			("improperly specified input stream");
	    iae.initCause(e);
	    throw iae;
	}
Methods Summary
public booleanequals(java.lang.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 2459.

param
o Object to be compared for equality with this X500Principal
return
true if the specified Object is equal to this X500Principal, false otherwise

        if (this == o) {
            return true;
	}
	if (o instanceof X500Principal == false) {
	    return false;
	}
	X500Principal other = (X500Principal)o;
	return this.thisX500Name.equals(other.thisX500Name);
public byte[]getEncoded()
Returns the distinguished name in ASN.1 DER encoded form. The ASN.1 notation for this structure is supplied in the documentation for {@link #X500Principal(byte[] name) X500Principal(byte[] name)}.

Note that the byte array returned is cloned to protect against subsequent modifications.

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

	try {
	    return thisX500Name.getEncoded();
	} catch (IOException e) {
            throw new RuntimeException("unable to get encoding", e);
	}
public java.lang.StringgetName()
Returns a string representation of the X.500 distinguished name using the format defined in RFC 2253.

This method is equivalent to calling getName(X500Principal.RFC2253).

return
the distinguished name of this X500Principal

	return getName(X500Principal.RFC2253);
public java.lang.StringgetName(java.lang.String format)
Returns a string representation of the X.500 distinguished name using the specified format. Valid values for the format are "RFC1779", "RFC2253", and "CANONICAL" (case insensitive).

If "RFC1779" is specified as the format, this method emits the attribute type keywords defined in RFC 1779 (CN, L, ST, O, OU, C, STREET). Any other attribute type is emitted as an OID.

If "RFC2253" is specified as the format, this method emits the attribute type keywords defined in RFC 2253 (CN, L, ST, O, OU, C, STREET, DC, UID). Any other attribute type is emitted as an OID. Under a strict reading, RFC 2253 only specifies a UTF-8 string representation. The String returned by this method is the Unicode string achieved by decoding this UTF-8 representation.

If "CANONICAL" is specified as the format, this method returns an RFC 2253 conformant string representation with the following additional canonicalizations:

  1. Leading zeros are removed from attribute types that are encoded as dotted decimal OIDs
  2. DirectoryString attribute values of type PrintableString and UTF8String are not output in hexadecimal format
  3. DirectoryString attribute values of types other than PrintableString and UTF8String are output in hexadecimal format
  4. Leading and trailing white space characters are removed from non-hexadecimal attribute values (unless the value consists entirely of white space characters)
  5. Internal substrings of one or more white space characters are converted to a single space in non-hexadecimal attribute values
  6. Relative Distinguished Names containing more than one Attribute Value Assertion (AVA) are output in the following order: an alphabetical ordering of AVAs containing standard keywords, followed by a numeric ordering of AVAs containing OID keywords.
  7. The only characters in attribute values that are escaped are those which section 2.4 of RFC 2253 states must be escaped (they are escaped using a preceding backslash character)
  8. The entire name is converted to upper case using String.toUpperCase(Locale.US)
  9. The entire name is converted to lower case using String.toLowerCase(Locale.US)
  10. The name is finally normalized using normalization form KD, as described in the Unicode Standard and UAX #15

Additional standard formats may be introduced in the future.

param
format the format to use
return
a string representation of this X500Principal using the specified format
throws
IllegalArgumentException if the specified format is invalid

	if (format != null) {
	    if (format.equalsIgnoreCase(RFC1779)) {
		return thisX500Name.getRFC1779Name();
	    } else if (format.equalsIgnoreCase(RFC2253)) {
		return thisX500Name.getRFC2253Name();
	    } else if (format.equalsIgnoreCase(CANONICAL)) {
		return thisX500Name.getRFC2253CanonicalName();
	    }
	}
        throw new IllegalArgumentException("invalid format specified");
public inthashCode()
Return a hash code for this X500Principal.

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

return
a hash code for this X500Principal

	return thisX500Name.hashCode();
private voidreadObject(java.io.ObjectInputStream s)
Reads this object from a stream (i.e., deserializes it).


	// re-create thisX500Name
	thisX500Name = new X500Name((byte[])s.readObject());
public java.lang.StringtoString()
Return a user-friendly string representation of this X500Principal.

return
a string representation of this X500Principal

	return thisX500Name.toString();
private voidwriteObject(java.io.ObjectOutputStream s)
Save the X500Principal object to a stream.

serialData
this X500Principal is serialized by writing out its DER-encoded form (the value of getEncoded is serialized).

	s.writeObject(thisX500Name.getEncodedInternal());