iaik.utils

Class RFC2253NameParser

java.lang.Object

iaik.utils.RFC2253NameParser

public class RFC2253NameParser
extends java.lang.Object

Implements functionality to parse the UTF-8 string representation of a X.501 Name, according to RFC 2253. This class may be used for converting a RFC 2253 string representation of a X.501 Name into a iaik.asn1.structures.Name object.

For converting a RFC 2253 string first create a new #RFC2253NameParser object and supply the string to be converted. Subsequently simply call method parse to get the Name object, e.g.:

 String rcf2253Name = "CN=Gregor Karlinger,O=IAIK,C=AT";
 RFC2253NameParser nameParser = new RFC2253NameParser(rcf2253Name);
 iaik.asn1.structures.Name = nameParser.parse();
 

Attention! When using this parser, please be aware that a valid transformation from an RFC 2253 string to a Distinguished Name (rspectively its encoding) only can be done when the RFC 2253 string gives a hexadecimal representation of the encoding. See RFC 2253, section 7.2: 7.2. Use of Distinguished Names in Security Applications The transformations of an AttributeValue value from its X.501 form to an LDAP string representation are not always reversible back to the same BER or DER form. An example of a situation which requires the DER form of a distinguished name is the verification of an X.509 certificate. For example, a distinguished name consisting of one RDN with one AVA, in which the type is commonName and the value is of the TeletexString choice with the letters 'Sam' would be represented in LDAP as the string CN=Sam. Another distinguished name in which the value is still 'Sam' but of the PrintableString choice would have the same representation CN=Sam. Applications which require the reconstruction of the DER form of the value SHOULD NOT use the string representation of attribute syntaxes when converting a distinguished name to the LDAP format. Instead, they SHOULD use the hexadecimal form prefixed by the octothorpe ('#') as described in the first paragraph of section 2.4. As specified by RFC 2253 this parser expects a hexadecimal representation when the AttributeType is given in the dotted-decimal form, e.g.:

 1.3.6.1.4.1.1466.0=#04024869
 

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	RFC2253NameParser.AVA Represents the parsing result for a Attribute-Value-Assertion.
protected class	RFC2253NameParser.ParsedName Represents the parsing result for a Name.
protected class	RFC2253NameParser.ParsedRDN Represents the parsing result for a Relative Distinguished Name.

Field Summary

Fields

Modifier and Type	Field and Description
protected RFC2253NameParser.ParsedName	name_ Collects the parsing results.
protected java.lang.StringBuffer	nameStrBuf_ The name to be parsed as StringBuffer.
protected int	position_ The current parsing position within nameStrBuf_ to be parsed.

Constructor Summary

Constructors

Constructor and Description
RFC2253NameParser(java.lang.String name) Standard constructor.

Method Summary

Modifier and Type	Method and Description
Name	parse() Parses the name string, which has been set in the constructor.
protected java.lang.String	parseAttrType() Parses the type of an Attribute-Value-Assertion, starting from the position indicated by the current value of the member variable position_.
protected RFC2253NameParser.AVA	parseAttrValue() Parses the value of an Attribute-Value-Assertion, starting from the position indicated by the current value of the member variable position_.
protected RFC2253NameParser.AVA	parseAVA() Parses an Attribute-Value-Assertion, starting from the position indicated by the current value of the member variable position_.
protected char	parseHexPair() Parses a pair of two characters representing the hex value of a character, starting from the position indicated by the current value of the member variable position_.
protected char	parseHexPairEscapeSequence()
protected RFC2253NameParser.ParsedRDN	parseRDN() Parses a Relative distinguished Name, starting from the position indicated by the current value of the member variable position_.
protected void	skipOIDIntro() Checks if the next for characters, starting at position position_ equal the String "OID." (case will be ignored).
protected void	skipSpace() Increases the member variable position_ as long as the character at position position_ does not equal the space character.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

name_

protected RFC2253NameParser.ParsedName name_

Collects the parsing results.

position_

protected int position_

The current parsing position within nameStrBuf_ to be parsed.

nameStrBuf_

protected java.lang.StringBuffer nameStrBuf_

The name to be parsed as StringBuffer.

Constructor Detail

RFC2253NameParser

public RFC2253NameParser(java.lang.String name)

Standard constructor. Initializes a new parser with the name to be parsed.

Parameters:

name - The ISO 10646 string to be parsed.

Method Detail

parse

public Name parse()
           throws RFC2253NameParserException

Parses the name string, which has been set in the constructor.

Returns:

a Name object representing the structure of the parsed X.501 Name.

Throws:

RFC2253NameParserException - if the name string could not be parsed successfully.

parseRDN

protected RFC2253NameParser.ParsedRDN parseRDN()
                                        throws RFC2253NameParserException

Parses a Relative distinguished Name, starting from the position indicated by the current value of the member variable position_.

Returns:

a ParsedRDN object representing the structure of the parsed RDN.

Throws:

RFC2253NameParserException - if the RDN could not be parsed successfully.

parseAVA

protected RFC2253NameParser.AVA parseAVA()
                                  throws RFC2253NameParserException

Parses an Attribute-Value-Assertion, starting from the position indicated by the current value of the member variable position_.

Returns:

a AVA object representing the structure of the parsed AVA.

Throws:

RFC2253NameParserException - if the AVA could not be parsed successfully.

parseAttrType

protected java.lang.String parseAttrType()
                                  throws RFC2253NameParserException

Parses the type of an Attribute-Value-Assertion, starting from the position indicated by the current value of the member variable position_.

Returns:

a String representing the type of a AVA.

Throws:

RFC2253NameParserException - if the AVA type could not be parsed successfully.

parseAttrValue

protected RFC2253NameParser.AVA parseAttrValue()
                                        throws RFC2253NameParserException

Parses the value of an Attribute-Value-Assertion, starting from the position indicated by the current value of the member variable position_.

Returns:

a AVA object with its value_ and hasHexValue_ fields set.

Throws:

RFC2253NameParserException - if the AVA value could not be parsed successfully.

parseHexPair

protected char parseHexPair()
                     throws RFC2253NameParserException

Parses a pair of two characters representing the hex value of a character, starting from the position indicated by the current value of the member variable position_.

Returns:

the character represented by the hex pair.

Throws:

RFC2253NameParserException - if the next two characters cannot be interpreted as hex pair.

parseHexPairEscapeSequence

protected char parseHexPairEscapeSequence()
                                   throws RFC2253NameParserException

Throws:

RFC2253NameParserException

skipSpace

protected void skipSpace()

Increases the member variable position_ as long as the character at position position_ does not equal the space character.

skipOIDIntro

protected void skipOIDIntro()

Checks if the next for characters, starting at position position_ equal the String "OID." (case will be ignored). If yes, increases position_ by 4.