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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package javax.security.auth.x500;

import java.io.*;
import java.security.Principal;
import java.util.Collections;
import java.util.Map;
import sun.security.x509.X500Name;
import sun.security.util.*;


 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 5280: 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. 
See Also:
Since:1.4
/**
 * <p> This class represents an X.500 {@code Principal}.
 * {@code X500Principal}s are represented by distinguished names such as
 * "CN=Duke, OU=JavaSoft, O=Sun Microsystems, C=US".
 *
 * <p> 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
 * <a href="http://tools.ietf.org/html/rfc2253">RFC 2253: Lightweight
 * Directory Access Protocol (v3): UTF-8 String Representation of
 * Distinguished Names</a>. This class, however, accepts string formats from
 * both RFC 2253 and <a href="http://tools.ietf.org/html/rfc1779">RFC 1779:
 * A String Representation of Distinguished Names</a>, and also recognizes
 * attribute type keywords whose OIDs (Object Identifiers) are defined in
 * <a href="http://tools.ietf.org/html/rfc5280">RFC 5280: Internet X.509
 * Public Key Infrastructure Certificate and CRL Profile</a>.
 *
 * <p> The string representation for this {@code X500Principal}
 * can be obtained by calling the {@code getName} methods.
 *
 * <p> Note that the {@code getSubjectX500Principal} and
 * {@code getIssuerX500Principal} methods of
 * {@code X509Certificate} return X500Principals representing the
 * issuer and subject fields of the certificate.
 *
 * @see java.security.cert.X509Certificate
 * @since 1.4
 */
public final class X500Principal implements Principal, java.io.Serializable {

    @java.io.Serial
    private static final long serialVersionUID = -500463348111345721L;

    
RFC 1779 String format of Distinguished Names.

/**
     * RFC 1779 String format of Distinguished Names.
     */
    public static final String RFC1779 = "RFC1779";
    
RFC 2253 String format of Distinguished Names.

/**
     * RFC 2253 String format of Distinguished Names.
     */
    public static final String RFC2253 = "RFC2253";
    
Canonical String format of Distinguished Names.

/**
     * Canonical String format of Distinguished Names.
     */
    public static final String CANONICAL = "CANONICAL";

    
The X500Name representing this principal.
NOTE: this field is reflectively accessed from within X500Name.

/**
     * The X500Name representing this principal.
     *
     * NOTE: this field is reflectively accessed from within X500Name.
     */
    private transient X500Name thisX500Name;

    
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().

/**
     * 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().
     */
    X500Principal(X500Name x500Name) {
        thisX500Name = x500Name;
    }

    
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 getName(String format)), as well as the T, DNQ or DNQUALIFIER, SURNAME, GIVENNAME, INITIALS, GENERATION, EMAILADDRESS, and SERIALNUMBER keywords whose Object Identifiers (OIDs) are defined in RFC 5280. Any other attribute type must be specified as an OID. 
This implementation enforces a more restrictive OID syntax than
defined in RFC 1779 and 2253. It uses the more correct syntax defined in
RFC 4512, which
specifies that OIDs contain at least 2 digits:

numericoid = number 1*( DOT number )  
Params:
  • name – an X.500 distinguished name in RFC 1779 or RFC 2253 format
Throws:
/**
     * Creates an {@code 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).
     *
     * <p>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 Object
     * Identifiers (OIDs) are defined in RFC 5280.
     * Any other attribute type must be specified as an OID.
     *
     * <p>This implementation enforces a more restrictive OID syntax than
     * defined in RFC 1779 and 2253. It uses the more correct syntax defined in
     * <a href="http://www.ietf.org/rfc/rfc4512.txt">RFC 4512</a>, which
     * specifies that OIDs contain at least 2 digits:
     *
     * <p>{@code numericoid = number 1*( DOT number ) }
     *
     * @param name an X.500 distinguished name in RFC 1779 or RFC 2253 format
     * @exception NullPointerException if the {@code name}
     *                  is {@code null}
     * @exception IllegalArgumentException if the {@code name}
     *                  is improperly specified
     */
    public X500Principal(String name) {
        this(name, Collections.<String, String>emptyMap());
    }

    
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 specified in X500Principal(String) and also recognizes additional keywords that have entries in the keywordMap parameter. Keyword entries in the keywordMap take precedence over the default keywords recognized by X500Principal(String). Keywords MUST be specified in all upper-case, otherwise they will be ignored. Improperly specified keywords are ignored; however if a keyword in the name maps to an improperly specified Object Identifier (OID), an IllegalArgumentException is thrown. It is permissible to have 2 different keywords that map to the same OID. 
This implementation enforces a more restrictive OID syntax than
defined in RFC 1779 and 2253. It uses the more correct syntax defined in
RFC 4512, which
specifies that OIDs contain at least 2 digits:

numericoid = number 1*( DOT number )  
Params:
  • name – an X.500 distinguished name in RFC 1779 or RFC 2253 format
  • keywordMap – an attribute type keyword map, where each key is a keyword String that maps to a corresponding object identifier in String form (a sequence of nonnegative integers separated by periods). The map may be empty but never null.
Throws:
Since:1.6
/**
     * Creates an {@code 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).
     *
     * <p> This constructor recognizes the attribute type keywords specified
     * in {@link #X500Principal(String)} and also recognizes additional
     * keywords that have entries in the {@code keywordMap} parameter.
     * Keyword entries in the keywordMap take precedence over the default
     * keywords recognized by {@code X500Principal(String)}. Keywords
     * MUST be specified in all upper-case, otherwise they will be ignored.
     * Improperly specified keywords are ignored; however if a keyword in the
     * name maps to an improperly specified Object Identifier (OID), an
     * {@code IllegalArgumentException} is thrown. It is permissible to
     * have 2 different keywords that map to the same OID.
     *
     * <p>This implementation enforces a more restrictive OID syntax than
     * defined in RFC 1779 and 2253. It uses the more correct syntax defined in
     * <a href="http://www.ietf.org/rfc/rfc4512.txt">RFC 4512</a>, which
     * specifies that OIDs contain at least 2 digits:
     *
     * <p>{@code numericoid = number 1*( DOT number ) }
     *
     * @param name an X.500 distinguished name in RFC 1779 or RFC 2253 format
     * @param keywordMap an attribute type keyword map, where each key is a
     *   keyword String that maps to a corresponding object identifier in String
     *   form (a sequence of nonnegative integers separated by periods). The map
     *   may be empty but never {@code null}.
     * @exception NullPointerException if {@code name} or
     *   {@code keywordMap} is {@code null}
     * @exception IllegalArgumentException if the {@code name} is
     *   improperly specified or a keyword in the {@code name} maps to an
     *   OID that is not in the correct form
     * @since 1.6
     */
    public X500Principal(String name, Map<String, String> keywordMap) {
        if (name == null) {
            throw new NullPointerException
                (sun.security.util.ResourcesMgr.getString
                ("provided.null.name"));
        }
        if (keywordMap == null) {
            throw new NullPointerException
                (sun.security.util.ResourcesMgr.getString
                ("provided.null.keyword.map"));
        }

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

    
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)) }



Params:
  • name – a byte array containing the distinguished name in ASN.1
DER encoded form
Throws:
/**
     * Creates an {@code X500Principal} from a distinguished name in
     * ASN.1 DER encoded form. The ASN.1 notation for this structure is as
     * follows.
     * <pre>{@code
     * 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)) }
     * }</pre>
     *
     * @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)
     */
    public X500Principal(byte[] name) {
        try {
            thisX500Name = new X500Name(name);
        } catch (Exception e) {
            IllegalArgumentException iae = new IllegalArgumentException
                        ("improperly specified input name");
            iae.initCause(e);
            throw iae;
        }
    }

    
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.

Params:
  • is – an InputStream containing the distinguished name in ASN.1 DER encoded form
Throws:
/**
     * Creates an {@code X500Principal} from an {@code 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)}.
     *
     * <p> The read position of the input stream is positioned
     * to the next available byte after the encoded distinguished name.
     *
     * @param is an {@code InputStream} containing the distinguished
     *          name in ASN.1 DER encoded form
     *
     * @exception NullPointerException if the {@code InputStream}
     *          is {@code null}
     * @exception IllegalArgumentException if an encoding error occurs
     *          (incorrect form for DN)
     */
    public X500Principal(InputStream is) {
        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;
        }
    }

    
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). 
Returns:the distinguished name of this X500Principal
/**
     * Returns a string representation of the X.500 distinguished name using
     * the format defined in RFC 2253.
     *
     * <p>This method is equivalent to calling
     * {@code getName(X500Principal.RFC2253)}.
     *
     * @return the distinguished name of this {@code X500Principal}
     */
    public String getName() {
        return getName(X500Principal.RFC2253);
    }

    
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.

Params:
  • format – the format to use
Throws:
Returns:a string representation of this X500Principal using the specified 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).
     *
     * <p> 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.
     *
     * <p> 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.
     *
     * <p> If "CANONICAL" is specified as the format,
     * this method returns an RFC 2253 conformant string representation
     * with the following additional canonicalizations:
     *
     * <ol>
     * <li> Leading zeros are removed from attribute types
     *          that are encoded as dotted decimal OIDs
     * <li> DirectoryString attribute values of type
     *          PrintableString and UTF8String are not
     *          output in hexadecimal format
     * <li> DirectoryString attribute values of types
     *          other than PrintableString and UTF8String
     *          are output in hexadecimal format
     * <li> Leading and trailing white space characters
     *          are removed from non-hexadecimal attribute values
     *          (unless the value consists entirely of white space characters)
     * <li> Internal substrings of one or more white space characters are
     *          converted to a single space in non-hexadecimal
     *          attribute values
     * <li> 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.
     * <li> 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)
     * <li> The entire name is converted to upper case
     *          using {@code String.toUpperCase(Locale.US)}
     * <li> The entire name is converted to lower case
     *          using {@code String.toLowerCase(Locale.US)}
     * <li> The name is finally normalized using normalization form KD,
     *          as described in the Unicode Standard and UAX #15
     * </ol>
     *
     * <p> Additional standard formats may be introduced in the future.
     *
     * @param format the format to use
     *
     * @return a string representation of this {@code X500Principal}
     *          using the specified format
     * @throws IllegalArgumentException if the specified format is invalid
     *          or null
     */
    public String getName(String format) {
        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");
    }

    
Returns a string representation of the X.500 distinguished name using the specified format. Valid values for the format are "RFC1779" and "RFC2253" (case insensitive). "CANONICAL" is not permitted and an IllegalArgumentException will be thrown. 
This method returns Strings in the format as specified in getName(String) and also emits additional attribute type keywords for OIDs that have entries in the oidMap parameter. OID entries in the oidMap take precedence over the default OIDs recognized by getName(String). Improperly specified OIDs are ignored; however if an OID in the name maps to an improperly specified keyword, an IllegalArgumentException is thrown. 
 Additional standard formats may be introduced in the future.

 Warning: additional attribute type keywords may not be recognized
by other implementations; therefore do not use this method if
you are unsure if these keywords will be recognized by other
implementations.

Params:
  • format – the format to use
  • oidMap – an OID map, where each key is an object identifier in String form (a sequence of nonnegative integers separated by periods) that maps to a corresponding attribute type keyword String. The map may be empty but never null.
Throws:
Returns:a string representation of this X500Principal using the specified format
Since:1.6
/**
     * Returns a string representation of the X.500 distinguished name
     * using the specified format. Valid values for the format are
     * "RFC1779" and "RFC2253" (case insensitive). "CANONICAL" is not
     * permitted and an {@code IllegalArgumentException} will be thrown.
     *
     * <p>This method returns Strings in the format as specified in
     * {@link #getName(String)} and also emits additional attribute type
     * keywords for OIDs that have entries in the {@code oidMap}
     * parameter. OID entries in the oidMap take precedence over the default
     * OIDs recognized by {@code getName(String)}.
     * Improperly specified OIDs are ignored; however if an OID
     * in the name maps to an improperly specified keyword, an
     * {@code IllegalArgumentException} is thrown.
     *
     * <p> Additional standard formats may be introduced in the future.
     *
     * <p> Warning: additional attribute type keywords may not be recognized
     * by other implementations; therefore do not use this method if
     * you are unsure if these keywords will be recognized by other
     * implementations.
     *
     * @param format the format to use
     * @param oidMap an OID map, where each key is an object identifier in
     *  String form (a sequence of nonnegative integers separated by periods)
     *  that maps to a corresponding attribute type keyword String.
     *  The map may be empty but never {@code null}.
     * @return a string representation of this {@code X500Principal}
     *          using the specified format
     * @throws IllegalArgumentException if the specified format is invalid,
     *  null, or an OID in the name maps to an improperly specified keyword
     * @throws NullPointerException if {@code oidMap} is {@code null}
     * @since 1.6
     */
    public String getName(String format, Map<String, String> oidMap) {
        if (oidMap == null) {
            throw new NullPointerException
                (sun.security.util.ResourcesMgr.getString
                ("provided.null.OID.map"));
        }
        if (format != null) {
            if (format.equalsIgnoreCase(RFC1779)) {
                return thisX500Name.getRFC1779Name(oidMap);
            } else if (format.equalsIgnoreCase(RFC2253)) {
                return thisX500Name.getRFC2253Name(oidMap);
            }
        }
        throw new IllegalArgumentException("invalid format specified");
    }

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

Returns:a byte array containing the distinguished name in ASN.1 DER
encoded form
/**
     * 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)}.
     *
     * <p>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
     */
    public byte[] getEncoded() {
        try {
            return thisX500Name.getEncoded();
        } catch (IOException e) {
            throw new RuntimeException("unable to get encoding", e);
        }
    }

    
Return a user-friendly string representation of this X500Principal. 
Returns:a string representation of this X500Principal
/**
     * Return a user-friendly string representation of this
     * {@code X500Principal}.
     *
     * @return a string representation of this {@code X500Principal}
     */
    public String toString() {
        return thisX500Name.toString();
    }

    
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 5280.

Params:
  • o – Object to be compared for equality with this X500Principal
Returns:true if the specified Object is equal to this X500Principal, false otherwise
/**
     * Compares the specified {@code Object} with this
     * {@code X500Principal} for equality.
     *
     * <p> Specifically, this method returns {@code true} if
     * the {@code Object} <i>o</i> is an {@code X500Principal}
     * and if the respective canonical string representations
     * (obtained via the {@code getName(X500Principal.CANONICAL)} method)
     * of this object and <i>o</i> are equal.
     *
     * <p> This implementation is compliant with the requirements of RFC 5280.
     *
     * @param o Object to be compared for equality with this
     *          {@code X500Principal}
     *
     * @return {@code true} if the specified {@code Object} is equal
     *          to this {@code X500Principal}, {@code false} otherwise
     */
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o instanceof X500Principal == false) {
            return false;
        }
        X500Principal other = (X500Principal)o;
        return this.thisX500Name.equals(other.thisX500Name);
    }

    
Return a hash code for this X500Principal. 
 The hash code is calculated via: getName(X500Principal.CANONICAL).hashCode() 
Returns:a hash code for this X500Principal
/**
     * Return a hash code for this {@code X500Principal}.
     *
     * <p> The hash code is calculated via:
     * {@code getName(X500Principal.CANONICAL).hashCode()}
     *
     * @return a hash code for this {@code X500Principal}
     */
    public int hashCode() {
        return thisX500Name.hashCode();
    }

    
Save the X500Principal object to a stream.

@serialDatathis X500Principal is serialized by writing out its DER-encoded form (the value of getEncoded is serialized).
/**
     * Save the X500Principal object to a stream.
     *
     * @serialData this {@code X500Principal} is serialized
     *          by writing out its DER-encoded form
     *          (the value of {@code getEncoded} is serialized).
     */
    @java.io.Serial
    private void writeObject(java.io.ObjectOutputStream s)
        throws IOException {
        s.writeObject(thisX500Name.getEncodedInternal());
    }

    
Reads this object from a stream (i.e., deserializes it).

/**
     * Reads this object from a stream (i.e., deserializes it).
     */
    @java.io.Serial
    private void readObject(java.io.ObjectInputStream s)
        throws java.io.IOException,
               java.io.NotActiveException,
               ClassNotFoundException {

        // re-create thisX500Name
        thisX500Name = new X500Name((byte[])s.readObject());
    }
}