org.tomitribe.churchkey.asn1

Class Asn1Object

java.lang.Object

org.tomitribe.churchkey.asn1.Asn1Object

public class Asn1Object
extends java.lang.Object

An ASN.1 TLV. The object is not parsed. It can only handle integers and strings.

Author:

zhang

Field Summary

Fields

Modifier and Type	Field and Description
protected int	length
protected int	tag
protected int	type
protected byte[]	value

Constructor Summary

Constructors

Constructor and Description
Asn1Object(int tag, int length, byte[] value) Construct a ASN.1 TLV.

Method Summary

Modifier and Type	Method and Description
java.math.BigInteger	getInteger() Get the value as integer
int	getLength()
DerParser	getParser() For constructed field, return a parser for its content.
java.lang.String	getString() Get value as string.
int	getType()
byte[]	getValue()
boolean	isConstructed()

Methods inherited from class java.lang.Object

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

Field Detail

type

protected final int type

length

protected final int length

value

protected final byte[] value

tag

protected final int tag

Constructor Detail

Asn1Object

public Asn1Object(int tag,
                  int length,
                  byte[] value)

Construct a ASN.1 TLV. The TLV could be either a constructed or primitive entity.

The first byte in DER encoding is made of following fields,

-------------------------------------------------
|Bit 8|Bit 7|Bit 6|Bit 5|Bit 4|Bit 3|Bit 2|Bit 1|
-------------------------------------------------
|  Class    | CF  |     +      Type             |
-------------------------------------------------
 

• Class: Universal, Application, Context or Private
• CF: Constructed flag. If 1, the field is constructed.
• Type: This is actually called tag in ASN.1. It indicates data type (Integer, String) or a construct (sequence, choice, set).

Parameters:

tag - Tag or Identifier

length - Length of the field

value - Encoded octet string for the field.

Method Detail

getType

public int getType()

getLength

public int getLength()

getValue

public byte[] getValue()

isConstructed

public boolean isConstructed()

getParser

public DerParser getParser()
                    throws java.io.IOException

For constructed field, return a parser for its content.

Returns:

A parser for the construct.

Throws:

java.io.IOException

getInteger

public java.math.BigInteger getInteger()
                                throws java.io.IOException

Get the value as integer

Throws:

java.io.IOException

getString

public java.lang.String getString()
                           throws java.io.IOException

Get value as string. Most strings are treated as Latin-1.

Throws:

java.io.IOException