ASN (6.0 API Documentation)

java.lang.Object
- iaik.asn1.ASN

All Implemented Interfaces:

java.lang.Cloneable
```
public class ASN
extends java.lang.Object
implements java.lang.Cloneable
```
The ASN class registers the several ASN.1 types. These types are represented at the Java level with ASN.XXX literals.
This class also acts as a factory for creating ASN.1 OBJECT subclasses for various kinds of Java objects.
This class consists of a static and a dynamic part. The static part may be used to statically register, create and/or parse ASN1 objects of already existing type. The dynamic part may be used for dynamically creating new ASN1 types to be registered within the IAIK-JCE ASN.1 architecture.
Each new created ASN.1 type has to be registered in the factory by specifying the class that implements the particular ASN.1 type. When dynamically creating a new ASN.1 type, the tag class, the tag number, and a name has to be specified for referring to the new type. Within the ASN.1 syntax, tags are used for unequivocally identifying some specific ASN.1 type. Each tag consists of a tag class and a tag number within this tag class. Four tag classes are defined:
- UNIVERSAL: reserved for types defined within the ASN.1 standard
- APPLICATION: to be used within some application specific scope
- PRIVATE: to be used within some enterprise specific scope
- CONTEXT SPECIFIC: to be used within the context of a structured ASN.1 type
As an example, the following code sequence creates a new class "MyPrivateType" that implements a private ASN.1 type "MyPrivateType" with tag number 1, and subsequently registers the new type within the ASN.1 factory:
```
 class MyPrivateType extends ASN1Object {

   private static ASN private_type = new ASN(0x01, "MyPrivateType", ASN.PRIVATE);

    static {
      // register this class as the implementation of the private tag 0x01
      ASN.register(private_type, MyPrivateType.class);
   }
   ...
 }
 
```
Once an ASN.1 type has been registered within the IAIK-JCE ASN.1 environment, one of the static create methods of this class may be used for creating an instance of this specific type. The following example creates an instance of the already registered universal ASN.1 type OCTET_STRING for the byte value 0x01 0xE3 0x54:
```
 ASN1Object obj = null;
 byte[] value = { (byte)0x01, (byte)0xE3, (byte)0x54 };
 obj = ASN.create(ASN.OCTET_STRING, value);
 
```
When a class implements the ASN1Type interface, the static createSequenceOf respectively createSetOf methods of this class may be used for constructing ASN.1 SEQUENCE OF respectively ASN.1 SET OF structures of the particular ASN.1 type in mind, e.g.:
```
 classThatImplementsASN1Type[] cASN1Type = ...;
 ASN1Object obj = ASN.createSequenceOf(cASN1Type);
 
```
The chain may be parsed back again by using the parseSequenceOf method, which may be utilized for both, SEQUENCE OF and SET OF structures:
```
 classThatImplementsASN1Type[] cASN1Type1 =
   (classThatImplementsASN1Type[])ASN.parseSequenceOf(obj, classThatImplementsASN1Type.class);
 
```
Version:

File Revision 31

See Also:
ASN1, ASN1Object, ASN1Type

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`APPLICATION` Tag class: application
`static ASN`	`BIT_STRING` Global ASN.1 type `BIT_STRING`
`static ASN`	`BMPString` Global ASN.1 type `BMPString`
`static ASN`	`BOOLEAN` Global ASN.1 type `BOOLEAN`
`static ASN`	`CON_SPEC` Global ASN.1 type `CON_SPEC` (CONTEXTSPECIFIC)
`static int`	`CONTEXT_SPECIFIC` Tag class: context-specific
`static ASN`	`ENUMERATED` Global ASN.1 type `ENUMERATED`
`static ASN`	`EXTERNAL` Global ASN.1 type `EXTERNAL`
`static ASN`	`GeneralizedTime` Global ASN.1 type `GeneralizedTime` (any time precision according to the ISO 2014 norm)
`static ASN`	`GeneralString` Global ASN.1 type `GeneralString`
`static ASN`	`IA5String` Global ASN.1 type `IA5String` (String of ASCII characters)
`static ASN`	`INTEGER` Global ASN.1 type `INTEGER`
`protected java.lang.String`	`name` Dynamic part: the name of this ASN.1 type.
`static ASN`	`NULL` Global ASN.1 type `NULL`
`static ASN`	`NumericString` Global ASN.1 type `NumericString`
`static ASN`	`OBJECT_DESCRIPTOR` Global ASN.1 type `OBJECT_DESCRIPTOR`
`static ASN`	`ObjectID` Global ASN.1 type `ObjectID`
`static ASN`	`OCTET_STRING` Global ASN.1 type `OCTET_STRING`
`static ASN`	`PrintableString` Global ASN.1 type `PrintableString`
`static int`	`PRIVATE` Tag class: private
`static ASN`	`SEQUENCE` Global ASN.1 type `SEQUENCE`
`static ASN`	`SET` Global ASN.1 type `SET`
`static ASN`	`T61String` Global ASN.1 type `T61String` (TeletexString; eight-bit extension to the ASCII character set )
`protected int`	`tag` Dynamic part: the tag number of this specific ASN.1 type.
`protected int`	`tag_class` Dynamic part: tag class of this specific ASN.1 type.
`static ASN`	`UNIString` Global ASN.1 type `UniversalString`
`static int`	`UNIVERSAL` Tag class: universal
`static ASN`	`UNKNOWN` Global ASN.1 type `UNKNOWN`
`static ASN`	`UTCTime` Global ASN.1 type `UTCTime` (coordinated universal time) (maximum precision down to seconds)
`static ASN`	`UTF8String` Global ASN.1 string type `UTF8String`
`static ASN`	`VisibleString` Global ASN.1 type `VisibleString` (ISO 646 String)

Constructor Summary

Constructors
Constructor and Description
`ASN(int tag, java.lang.String name)` Creates a new ASN.1 type with given tag number and name.
`ASN(int tag, java.lang.String name, int tagClass)` Creates a new ASN.1 type with given tag number, name and tag class.

Method Summary

Methods
Modifier and Type	Method and Description
`java.lang.Object`	`clone()` Returns a clone ("field by field copy") of this ASN.1 type with same tag and name.
`static ASN1Object`	`create(ASN type)` Creates a new ASN.1 object for the given ASN.1 type.
`static ASN1Object`	`create(ASN type, java.lang.Object value)` Creates new ASN.1 object for the given ASN.1 type and Java value.
`static ASN1Object`	`createSequenceOf(ASN1Type[] array)` Creates a SEQUENCE OF ASN.1 object from the given array of ASN.1 types.
`static ASN1Object`	`createSequenceOf(java.util.Vector asn1Type)` Creates a SEQUENCE OF ASN.1 object from the given vector of ASN.1 types.
`static ASN1Object`	`createSetOf(ASN1Type[] array)` Creates a SET OF ASN.1 object from the given array of ASN.1 types.
`static ASN1Object`	`createSetOf(ASN1Type[] array, boolean sorted)` Creates a SET OF ASN.1 object from the given array of ASN.1 types.
`static ASN1Object`	`createSetOf(java.util.Vector asn1Type)` Creates a SET OF ASN.1 object from the given vector of ASN.1 types.
`boolean`	`equals(java.lang.Object o)` Compares two ASN.1 types by tag number and tag class.
`java.lang.String`	`getName()` Returns the name of this ASN.1 type.
`int`	`getTag()` Returns the tag number of this ASN.1 type.
`int`	`getTagClass()` Returns the tag class.
`int`	`hashCode()` Returns a hashcode for this object.
`static ASN1Type[]`	`parseSequenceOf(ASN1Object obj, java.lang.Class cls)` Parses a `SEQUENCE OF` ASN.1 object and returns an array containing all the components of the given ASN.1 object.
`static void`	`register(ASN type, java.lang.Class cls)` Registers a new ASN.1 type.
`java.lang.String`	`toString()` Returns a String describing this ASN.1 type.

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - UNIVERSAL
```
public static final int UNIVERSAL
```
    Tag class: universal
    
    See Also:
    Constant Field Values
  - APPLICATION
```
public static final int APPLICATION
```
    Tag class: application
    
    See Also:
    Constant Field Values
  - CONTEXT_SPECIFIC
```
public static final int CONTEXT_SPECIFIC
```
    Tag class: context-specific
    
    See Also:
    Constant Field Values
  - PRIVATE
```
public static final int PRIVATE
```
    Tag class: private
    
    See Also:
    Constant Field Values
  - UNKNOWN
```
public static final ASN UNKNOWN
```
    Global ASN.1 type UNKNOWN
  - BOOLEAN
```
public static final ASN BOOLEAN
```
    Global ASN.1 type BOOLEAN
  - INTEGER
```
public static final ASN INTEGER
```
    Global ASN.1 type INTEGER
  - BIT_STRING
```
public static final ASN BIT_STRING
```
    Global ASN.1 type BIT_STRING
  - OCTET_STRING
```
public static final ASN OCTET_STRING
```
    Global ASN.1 type OCTET_STRING
  - NULL
```
public static final ASN NULL
```
    Global ASN.1 type NULL
  - ObjectID
```
public static final ASN ObjectID
```
    Global ASN.1 type ObjectID
  - OBJECT_DESCRIPTOR
```
public static final ASN OBJECT_DESCRIPTOR
```
    Global ASN.1 type OBJECT_DESCRIPTOR
  - EXTERNAL
```
public static final ASN EXTERNAL
```
    Global ASN.1 type EXTERNAL
  - ENUMERATED
```
public static final ASN ENUMERATED
```
    Global ASN.1 type ENUMERATED
  - UTF8String
```
public static final ASN UTF8String
```
    Global ASN.1 string type UTF8String
  - SEQUENCE
```
public static final ASN SEQUENCE
```
    Global ASN.1 type SEQUENCE
  - SET
```
public static final ASN SET
```
    Global ASN.1 type SET
  - NumericString
```
public static final ASN NumericString
```
    Global ASN.1 type NumericString
  - PrintableString
```
public static final ASN PrintableString
```
    Global ASN.1 type PrintableString
  - T61String
```
public static final ASN T61String
```
    Global ASN.1 type T61String (TeletexString; eight-bit extension to the ASCII character set )
  - IA5String
```
public static final ASN IA5String
```
    Global ASN.1 type IA5String (String of ASCII characters)
  - UTCTime
```
public static final ASN UTCTime
```
    Global ASN.1 type UTCTime (coordinated universal time) (maximum precision down to seconds)
  - GeneralizedTime
```
public static final ASN GeneralizedTime
```
    Global ASN.1 type GeneralizedTime (any time precision according to the ISO 2014 norm)
  - VisibleString
```
public static final ASN VisibleString
```
    Global ASN.1 type VisibleString (ISO 646 String)
  - GeneralString
```
public static final ASN GeneralString
```
    Global ASN.1 type GeneralString
  - UNIString
```
public static final ASN UNIString
```
    Global ASN.1 type UniversalString
  - BMPString
```
public static final ASN BMPString
```
    Global ASN.1 type BMPString
  - CON_SPEC
```
public static final ASN CON_SPEC
```
    Global ASN.1 type CON_SPEC (CONTEXTSPECIFIC)
  - tag
```
protected int tag
```
    Dynamic part: the tag number of this specific ASN.1 type.
  - tag_class
```
protected int tag_class
```
    Dynamic part: tag class of this specific ASN.1 type.
  - name
```
protected java.lang.String name
```
    Dynamic part: the name of this ASN.1 type.
- Constructor Detail
  - ASN
```
public ASN(int tag,
   java.lang.String name)
```
    Creates a new ASN.1 type with given tag number and name. The tag class is set to UNIVERSAL.
    
    Parameters:
    tag - the tag number of the new ASN.1 type
    name - the name of the new ASN.1 type
  - ASN
```
public ASN(int tag,
   java.lang.String name,
   int tagClass)
```
    Creates a new ASN.1 type with given tag number, name and tag class. Each new created ASN.1 type has to be registered in the factory by specifying the class that implements the particular ASN.1 type. As an example, the following code sequence creates a new class "MyPrivateType" that implements a private ASN.1 type "MyPrivateType" with tag number 1, and subsequently registers the new type within the ASN.1 factory:
```
 class MyPrivateType extends ASN1Object {

   private static ASN private_type = new ASN(0x01, "MyPrivateType", ASN.PRIVATE);

    static {
      // register this class as the implementation of the private tag 0x01
      ASN.register(private_type, MyPrivateType.class);
   }
   ...
 }
 
```
    Parameters:
    tag - the tag number of the new ASN.1 type
    name - the name of the new ASN.1 type
    tagClass - the tag class (UNIVERSAL, APPLICATION, CONTEXT_SPECIFIC, or PRIVATE)
- Method Detail
  - create
```
public static ASN1Object create(ASN type)
                         throws java.lang.InstantiationException
```
    Creates a new ASN.1 object for the given ASN.1 type. If null is supplied as type, an ASN.1 NULL object is returned.
    Only ASN.1 objects of already registered type can be created by this method. The following example creates a new instance of an ASN.1 object of registered universal type OCTET_STRING:
```
 ASN1Object obj = null;
 obj = ASN.create(ASN.OCTET_STRING);
 
```
    Parameters:
    type - the ASN.1 type name of the new ASN.1 object to be created
    
    Returns:
    the new created ASN.1 object which is a ASN.1 NULL object if the given type is null
    
    Throws:
    
    java.lang.InstantiationException - if the internal factory cannot create an instance of requested type
    See Also:
    ASN1Object
  - create
```
public static ASN1Object create(ASN type,
                java.lang.Object value)
                         throws java.lang.InstantiationException
```
    Creates new ASN.1 object for the given ASN.1 type and Java value. If, for instance, the new ASN.1 object is of ASN.1 type IA5String, the corresponding Java value will be a Java String object.
    Only ASN.1 objects of already registered type can be created by this method. The following example creates an instance of the already registered universal ASN.1 type OCTET_STRING for the byte value 0x01 0xE3 0x54:
```
 ASN1Object obj = null;
 byte[] value = { (byte)0x01, (byte)0xE3, (byte)0x54 };
 obj = ASN.create(ASN.OCTET_STRING, value);
 
```
    Parameters:
    type - the ASN.1 type name of the new ASN.1 object to be created
    value - the Java value to be set for this ASN.1 object
    
    Returns:
    the new created ASN.1 object which is a ASN.1 NULL object if the given type is null
    
    Throws:
    
    java.lang.InstantiationException - if the internal factory cannot create an instance of requested type
    See Also:
    ASN1Object
  - register
```
public static void register(ASN type,
            java.lang.Class cls)
```
    Registers a new ASN.1 type. Called by the OBJECT classes' static initializers to register those ASN.1 types that the OBJECT classes know of.
    As an example, the following code sequence creates a new class "MyPrivateType" that implements a private ASN.1 type "MyPrivateType" with tag number 1, and subsequently registers the new type within the ASN.1 factory:
```
 class MyPrivateType extends ASN1Object {

   private static ASN private_type = new ASN(0x01, "MyPrivateType", ASN.PRIVATE);

    static {
      // register this class as the implementation of the private tag 0x01
      ASN.register(private_type, MyPrivateType.class);
   }
   ...
 }
 
```
    Parameters:
    type - the new ASN.1 type to be registered
    cls - the class that implements the ASN.1 type to be registered
    
    Throws:
    
    java.lang.IllegalArgumentException - if the given class is not an extended from ASN1Object
  - createSequenceOf
```
public static ASN1Object createSequenceOf(ASN1Type[] array)
                                   throws CodingException
```
    Creates a SEQUENCE OF ASN.1 object from the given array of ASN.1 types. All components have to be of the same ASN.1 type. This method only can be utilized for instances of classes that implement the ASN1Type interface, e.g.:
```
 classThatImplementsASN1Type[] cASN1Type = ...;
 ASN1Object obj = ASN.createSequenceOf(cASN1Type);
 
```
    The chain may be parsed back again by using the parseSequenceOf method.
    Parameters:
    array - the array of objects
    
    Returns:
    the created ASN1Object as SEQUENCE OF ASN1Type
    
    Throws:
    
    CodingException - if there occurs an error while constructing the ASN1Object
    See Also:
    ASN1Object, ASN1Type, SEQUENCE
  - createSequenceOf
```
public static ASN1Object createSequenceOf(java.util.Vector asn1Type)
                                   throws CodingException
```
    Creates a SEQUENCE OF ASN.1 object from the given vector of ASN.1 types. All components have to be of the same ASN.1 type. This method only can be utilized for instances of classes that implement the ASN1Type interface, e.g.:
```
 Vector vectorOfASN1TypeImplementingClassInstances = ...;
 ...
 ASN1Object obj = ASN.createSequenceOf(vectorOfASN1TypeImplementingClassInstances);
 
```
    The class instances may be parsed back again by using the parseSequenceOf method.
    Parameters:
    asn1Type - a Vector containing the ASN1Type objects
    
    Returns:
    the created ASN1Object as SEQUENCE OF ASN1Type
    
    Throws:
    
    CodingException - if there occurs an error while constructing the ASN1Object
    See Also:
    ASN1Object, ASN1Type, SEQUENCE
  - createSetOf
```
public static ASN1Object createSetOf(ASN1Type[] array)
                              throws CodingException
```
    Creates a SET OF ASN.1 object from the given array of ASN.1 types. All components have to be of the same ASN.1 type. This method only can be utilized for instances of classes that implement the ASN1Type interface, e.g.:
```
 classThatImplementsASN1Type[] cASN1Type = ...;
 ASN1Object obj = ASN.createSetOf(cASN1Type);
 
```
    The chain may be parsed back again by using the parseSequenceOf method.
    Parameters:
    array - the array of objects
    
    Returns:
    the created ASN1Object as SET OF ASN1Type
    
    Throws:
    
    CodingException - if there was an error while constructing the ASN1Object
    See Also:
    ASN1Object, ASN1Type, SET
  - createSetOf
```
public static ASN1Object createSetOf(ASN1Type[] array,
                     boolean sorted)
                              throws CodingException
```
    Creates a SET OF ASN.1 object from the given array of ASN.1 types. If the parameter sorted is set to true, the SET OF will be sorted by the component encodings to give a proper DER encoding. Otherwise the components appear unsorted to give a BER encoding.
    
    Parameters:
    array - the array of objects
    sorted - whether to sort the components or not
    
    Returns:
    the created ASN1Object as SET OF ASN1Type
    
    Throws:
    
    CodingException - if there was an error while constructing the ASN1Object
    See Also:
    ASN1Object, ASN1Type, SET
  - createSetOf
```
public static ASN1Object createSetOf(java.util.Vector asn1Type)
                              throws CodingException
```
    Creates a SET OF ASN.1 object from the given vector of ASN.1 types. All components have to be of the same ASN.1 type. This method only can be utilized for instances of classes that implement the ASN1Type interface, e.g.:
```
 Vector vectorOfASN1TypeImplementingClassInstances = ...;
 ...
 ASN1Object obj = ASN.createSetOf(vectorOfASN1TypeImplementingClassInstances);
 
```
    The class instances may be parsed back again by using the parseSequenceOf method.
    Parameters:
    asn1Type - a Vector containing the ASN1Type objects
    
    Returns:
    the created ASN1Object as SET OF ASN1Type
    
    Throws:
    
    CodingException - if there occurs an error while constructing the ASN1Object
    See Also:
    ASN1Object, ASN1Type, SET
  - parseSequenceOf
```
public static ASN1Type[] parseSequenceOf(ASN1Object obj,
                         java.lang.Class cls)
                                  throws CodingException
```
    Parses a SEQUENCE OF ASN.1 object and returns an array containing all the components of the given ASN.1 object. All components are of the same ASN.1 type specified by the given class implementing the ASN.1 type in mind. This class has to implement the ASN1Type interface. This method also may be used for parsing a SET OF ASN.1 objects that may have been created by means of the createSetOf method, e.g.:
```
 classThatImplementsASN1Type[] cASN1Type1 =
   (classThatImplementsASN1Type[])ASN.parseSequenceOf(obj, classThatImplementsASN1Type.class);
 
```
    Parameters:
    obj - the ASN1Object to be parsed
    cls - the name of the class that implements the components' ASN.1 type
    
    Returns:
    an ASN1Type array containing the components of the parsed ASN.1 object
    
    Throws:
    
    CodingException - if the ASN1Object could not be parsed
    See Also:
    ASN1Type, ASN1Object
  - getName
```
public java.lang.String getName()
```
    Returns the name of this ASN.1 type.
    
    Returns:
    the name of this ASN.1 type
  - getTag
```
public int getTag()
```
    Returns the tag number of this ASN.1 type. The tag number unequivocally identifies some specific ASN.1 type within its tag class.
    
    Returns:
    the tag number of this ASN.1 type
  - getTagClass
```
public int getTagClass()
```
    Returns the tag class. The tag class may be:
    - UNIVERSAL: reserved for types defined within the ASN.1 standard
    - APPLICATION: to be used within some application specific scope
    - PRIVATE: to be used within some enterprise specific scope
    - CONTEXT SPECIFIC: to be used within the context of a structured ASN.1 type
    Returns:
    the tag class
  - equals
```
public boolean equals(java.lang.Object o)
```
    Compares two ASN.1 types by tag number and tag class. This method returns true, if the two ASN.1 types have the same tag class and the same tag number; otherwise it returns false.
    
    Overrides:
    
    equals in class java.lang.Object
    
    Parameters:
    o - the ASN.1 type to be compared with the actual ASN.1 type
    
    Returns:
    true if the two ASN.1 types match, false otherwise
  - hashCode
```
public int hashCode()
```
    Returns a hashcode for this object.
    
    Overrides:
    
    hashCode in class java.lang.Object
    
    Returns:
    a hashcode
  - clone
```
public java.lang.Object clone()
```
    Returns a clone ("field by field copy") of this ASN.1 type with same tag and name.
    
    Overrides:
    
    clone in class java.lang.Object
    
    Returns:
    a clone of this ASN.1 type
  - toString
```
public java.lang.String toString()
```
    Returns a String describing this ASN.1 type.
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    a string specifying tag and name of this ASN.1 type

Class ASN

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

UNIVERSAL

APPLICATION

CONTEXT_SPECIFIC

PRIVATE

UNKNOWN

BOOLEAN

INTEGER

BIT_STRING

OCTET_STRING

NULL

ObjectID

OBJECT_DESCRIPTOR

EXTERNAL

ENUMERATED

UTF8String

SEQUENCE

SET

NumericString

PrintableString

T61String

IA5String

UTCTime

GeneralizedTime

VisibleString

GeneralString

UNIString

BMPString

CON_SPEC

tag

tag_class

name

Constructor Detail

ASN

ASN

Method Detail

create

create

register

createSequenceOf

createSequenceOf

createSetOf

createSetOf

createSetOf

parseSequenceOf

getName

getTag

getTagClass

equals

hashCode

clone

toString