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OpenSCDP

ASN1 - Reference Documentation

Implementation of support for ASN.1 data structures using DER encoding rule

Constants

Type	Name	Description
Number	UNIVERSAL	END_OF_CONTENTS ASN.1 class
Number	APPLICATION	APPLICATION ASN.1 class
Number	CONTEXT	CONTEXT ASN.1 class
Number	PRIVATE	PRIVATE ASN.1 class
Number	END_OF_CONTENTS	END_OF_CONTENTS ASN.1 object
Number	BOOLEAN	BOOLEAN ASN.1 object
Number	INTEGER	INTEGER ASN.1 object
Number	BIT_STRING	BIT_STRING ASN.1 object
Number	OCTET_STRING	OCTET_STRING ASN.1 object
Number	NULL	NULL ASN.1 object
Number	OBJECT_IDENTIFIER	OBJECT_IDENTIFIER ASN.1 object
Number	OBJECT_DESCRIPTOR	OBJECT_DESCRIPTOR ASN.1 object
Number	EXTERNAL_TYPE	EXTERNAL_TYPE ASN.1 object
Number	REAL	REAL ASN.1 object
Number	ENUMERATED	ENUMERATED ASN.1 object
Number	EMBEDDED_PDV	EMBEDDED_PDV ASN.1 object
Number	UTF8String	UTF8String ASN.1 object
Number	RELATIVE_OID	RELATIVE_OID ASN.1 object
Number	SEQUENCE	SEQUENCE ASN.1 object
Number	SET	SET ASN.1 object
Number	NumericString	NumericString ASN.1 object
Number	PrintableString	PrintableString ASN.1 object
Number	T61String	T61String ASN.1 object
Number	IA5String	IA5String ASN.1 object
Number	UTCTime	UTCTime ASN.1 object
Number	GeneralizedTime	GeneralizedTime ASN.1 object
Number	GeneralString	GeneralString ASN.1 object
Number	UniversalString	UniversalString ASN.1 object
Number	BMPString	BMPString ASN.1 object

Properties

Type	Name	Description
Number	tag	The combined value of the tag, containing the class, constructed flag and number
Number	length	Length of the value field
ByteString	value	The value field
Number	tagclass	The class of the ASN.1 object. Is one of ASN1.UNIVERSAL, ASN1.APPLICATION, ASN1.CONTEXT or ASN1.PRIVATE
Number	tagnumber	The number element of the tag
Boolean	isconstructed	True, if the object is a constructed ASN.1 object
Number	size	Size of the concatenation of tag, length and value field
Number	elements	Number of elements in a constructed object. 0 for primitive objects
String	name	Name of object

Constructor

Prototype

ASN1(Number tag)

ASN1(Number tag, ByteString value)

ASN1(Number tag, ASN1 object*)

ASN1(ByteString encoded)

ASN1(String name, Number tag)

ASN1(String name, Number tag, ByteString value)

ASN1(String name, Number tag, ASN1 object*)

ASN1(String name, ByteString encoded)

Description

Create an ASN.1 object, either primitive or constructed. The constructor without a value or with a list of TLV objects will create a constructed object, which can be further completed using the add() method. The constructor with a value field will create a primitive, immutuable object

Arguments

Type	Name	Description
`Number`	tag	Tag value, including class, primitive/constructed flag and id
`String`	name	Object name to be assigned to the object
`ASN1`	object	One or more ASN1 object(s) to be included in constructed object
`ByteString`	value	Value field of object
`ByteString`	encoded	DER encoded ASN.1 object

Exceptions

Name	Value	Description
GPError	GPError.ARGUMENTS_MISSING	Too few arguments in call
GPError	GPError.INVALID_ARGUMENTS	Too many arguments in call
GPError	GPError.INVALID_TYPE	Type of argument is invalid for call
GPError	GPError.INVALID_DATA	ByteString does not contain a valid DER encoded object

Example


t = new ASN1(ASN1.SEQUENCE);
assert(t instanceof ASN1);
assert(t.tag == ASN1.SEQUENCE);
assert(t.length == 0);
assert(t.value.toString(HEX) == "");

assert(t.tagclass == ASN1.UNIVERSAL);
assert(t.tagnumber == 16);
assert(t.isconstructed);
assert(t.size == 2);
assert(t.elements == 0);
t = new ASN1("singleSequence", ASN1.SEQUENCE);
print(t);

t = new ASN1(ASN1.OBJECT_IDENTIFIER, new ByteString("2A1200", HEX));
assert(t instanceof ASN1);
assert(t.tag == ASN1.OBJECT_IDENTIFIER);
assert(t.length == 3);
assert(t.value.toString(HEX) == "2A1200");

assert(t.tagclass == ASN1.UNIVERSAL);
assert(t.tagnumber == 6);
assert(!t.isconstructed);
assert(t.size == 5);
t = new ASN1("objectIdentifier", ASN1.OBJECT_IDENTIFIER, new ByteString("2A1200", HEX));
print(t);

t = new ASN1(new ByteString("06022A11", HEX));
assert(t instanceof ASN1);
assert(t.tag == ASN1.OBJECT_IDENTIFIER);
assert(t.length == 2);
assert(t.value.toString(HEX) == "2A11");

assert(t.tagclass == ASN1.UNIVERSAL);
assert(t.tagnumber == 6);
assert(!t.isconstructed);
assert(t.size == 4);
t = new ASN1("fromByteString", new ByteString("06022A11", HEX));
print(t);

t = new ASN1(ASN1.SEQUENCE, 
		new ASN1(ASN1.OCTET_STRING, new ByteString("Hello World", ASCII)),
		new ASN1(ASN1.GeneralizedTime, new ByteString("20051010120000Z", ASCII)));

assert(t instanceof ASN1);
assert(t.tag == ASN1.SEQUENCE);
assert(t.elements == 2);

assert(t.tagclass == ASN1.UNIVERSAL);
assert(t.tagnumber == 16);
assert(t.isconstructed);
assert(t.size == 32);
t = new ASN1("complexSequence", ASN1.SEQUENCE, 
		new ASN1(ASN1.OCTET_STRING, new ByteString("Hello World", ASCII)),
		new ASN1(ASN1.GeneralizedTime, new ByteString("20051010120000Z", ASCII)));
print(t);


root = new X509("root.cer");
bs = root.getBytes();
print(bs);
t = new ASN1(bs);
assert(t instanceof ASN1);
print(t);

add()

Prototype

ASN1 add(ASN1 object*)

ASN1 add(Number index, ASN1 object*)

Description

Add one or more ASN.1 objects to a constructed object at index or at the end.

Arguments

Type	Name	Description
`ASN1`	object	ASN.1 objects to add
`Number`	index	Zero based index

Return

ASN1 The object the method is applied to

Exceptions

Name	Value	Description
GPError	GPError.ARGUMENTS_MISSING	Too few arguments in call
GPError	GPError.INVALID_ARGUMENTS	Too many arguments in call
GPError	GPError.INVALID_TYPE	Type of argument is invalid for call
GPError	GPError.INVALID_MECH	Object must be constructed

Example


t = new ASN1(ASN1.SEQUENCE);
t.add(new ASN1(ASN1.OBJECT_IDENTIFIER, new ByteString("2A1200", HEX)));

t.add(new ASN1(ASN1.OBJECT_IDENTIFIER, new ByteString("2A1200", HEX)),
      new ASN1(ASN1.PrintableString, new ByteString("Hello World", ASCII)));

t.add(0, new ASN1(ASN1.INTEGER, new ByteString("01", HEX)));

get()

Prototype

ASN1 get(Number index)

Description

Get ASN.1 object at zero based index from constructed object.

This method does not provide a copy of the element, but a reference to it. Changes to the element will have an effect in parent objects or other instances obtained with the get() method

Arguments

Type	Name	Description
`Number`	index	Zero based offset

Return

ASN1 New ASN1 object representing the element at the requested index

Exceptions

Name	Value	Description
GPError	GPError.ARGUMENTS_MISSING	Too few arguments in call
GPError	GPError.INVALID_ARGUMENTS	Too many arguments in call
GPError	GPError.INVALID_TYPE	Type of argument is invalid for call
GPError	GPError.INVALID_INDEX	Index is out of range
GPError	GPError.INVALID_MECH	Object must be constructed

Example


t = new ASN1(ASN1.SEQUENCE);
t.add(new ASN1(ASN1.OBJECT_IDENTIFIER, new ByteString("2A1200", HEX)));
t.add(new ASN1(ASN1.OCTET_STRING, new ByteString("ÄÖÜ", UTF8)));

n = t.get(0);
assert(n instanceof ASN1);
assert(n.tag == ASN1.OBJECT_IDENTIFIER);
assert(n.length == 3);

n = t.get(1);
assert(n instanceof ASN1);
assert(n.tag == ASN1.OCTET_STRING);
assert(n.length == 6);

find()

Prototype

ASN1 find(Number tag)

ASN1 find(Number tag, Number index)

ASN1 find(Number tag, ASN1 cursor)

Description

Find ASN1 object with matching tag.

The method can be called with an object after which the search will start. The constant value null indicates the beginning of the list.

This method does not provide a copy of the element, but a reference to it. Changes to the element will have an effect in parent objects or other instances obtained with the get() method

Arguments

Type	Name	Description
`Number`	tag	The tag value to search for
`Number`	index	Zero based offset of the object at which the search is started.
`ASN1`	cursor	The object after which the search resumes or null for a new search

Return

ASN1 New ASN1 object representing the found element or null if no match found

Exceptions

Name	Value	Description
GPError	GPError.ARGUMENTS_MISSING	Too few arguments in call
GPError	GPError.INVALID_ARGUMENTS	Too many arguments in call
GPError	GPError.INVALID_TYPE	Type of argument is invalid for call
GPError	GPError.INVALID_INDEX	Index is out of range
GPError	GPError.INVALID_MECH	Object must be constructed

Example


t = new ASN1(ASN1.SEQUENCE);
t.add(new ASN1(ASN1.OBJECT_IDENTIFIER, new ByteString("2A1200", HEX)));
t.add(new ASN1(ASN1.OCTET_STRING, new ByteString("ÄÖÜ", UTF8)));
t.add(new ASN1(ASN1.INTEGER, new ByteString("00", HEX)));
t.add(new ASN1(ASN1.INTEGER, new ByteString("0000", HEX)));

n = t.find(ASN1.OBJECT_IDENTIFIER);
assert(n instanceof ASN1);
assert(n.tag == ASN1.OBJECT_IDENTIFIER);

n = t.find(ASN1.INTEGER);
assert(n instanceof ASN1);
assert(n.tag == ASN1.INTEGER);
assert(n.length == 1);


n = t.find(ASN1.INTEGER, n);
assert(n instanceof ASN1);
assert(n.tag == ASN1.INTEGER);
assert(n.length == 2);

n = t.find(ASN1.INTEGER, n);
assert(n == null);

n = t.find(ASN1.OBJECT_IDENTIFIER, n);
assert(n instanceof ASN1);
assert(n.tag == ASN1.OBJECT_IDENTIFIER);


n = t.find(ASN1.INTEGER, 1);
assert(n instanceof ASN1);
assert(n.tag == ASN1.INTEGER);
assert(n.length == 1);

n = t.find(ASN1.INTEGER, 3);
assert(n instanceof ASN1);
assert(n.tag == ASN1.INTEGER);
assert(n.length == 2);

n = t.find(ASN1.OBJECT_IDENTIFIER, 0);
assert(n instanceof ASN1);
assert(n.tag == ASN1.OBJECT_IDENTIFIER);

remove()

Prototype

void remove(Number index)

Description

Remove ASN.1 object at zero based index from constructed object.

Arguments

Type	Name	Description
`Number`	index	Zero based offset

Return

Exceptions

Name	Value	Description
GPError	GPError.ARGUMENTS_MISSING	Too few arguments in call
GPError	GPError.INVALID_ARGUMENTS	Too many arguments in call
GPError	GPError.INVALID_TYPE	Type of argument is invalid for call
GPError	GPError.INVALID_INDEX	Index is out of range
GPError	GPError.INVALID_MECH	Object must be constructed

Example


t = new ASN1(ASN1.SEQUENCE);
t.add(new ASN1(ASN1.OBJECT_IDENTIFIER, new ByteString("2A1200", HEX)));
t.add(new ASN1(ASN1.OCTET_STRING, new ByteString("ÄÖÜ", UTF8)));

t.remove(0);

n = t.get(0);
assert(n instanceof ASN1);
assert(n.tag == ASN1.OCTET_STRING);
assert(n.length == 6);

getBytes()

Prototype

ByteString getBytes()

Description

Return the DER encoded ASN.1 object

Return

ByteString The DER encoded object

Exceptions

Name	Value	Description
GPError	GPError.INVALID_ARGUMENTS	Too many arguments in call

Example


t = new ASN1(ASN1.SEQUENCE);
t.add(new ASN1(ASN1.OBJECT_IDENTIFIER, new ByteString("2A1200", HEX)));
assert(t.getBytes().toString(HEX) == "300506032A1200");

getDate()

Prototype

Date getDate()

Description

Return the value field of a primitive ASN.1 object as a date. This usually works for for GeneralizedTime objects which store date and time in ISO8601 format.

Return

ByteString The DER encoded object

Exceptions

Name	Value	Description
GPError	GPError.INVALID_ARGUMENTS	Too many arguments in call
GPError	GPError.INVALID_MECH	Object must be primitive
GPError	GPError.INVALID_DATA	Value field does not contain a valid date and time

Example


// Local time
t = new ASN1(ASN1.GeneralizedTime, new ByteString("20050929113422", ASCII));
d = t.getDate();
print(d);
assert(d.toString().substr(0,24) == "Thu Sep 29 2005 11:34:22");
	    
// UTC time
t = new ASN1(ASN1.GeneralizedTime, new ByteString("20050929113422Z", ASCII));
d = t.getDate();
assert(d.getTime() == 1127993662000);

// CEST time
t = new ASN1(ASN1.GeneralizedTime, new ByteString("20050929133422+0200", ASCII));
d = t.getDate();
assert(d.getTime() == 1127993662000);

// Local time with millisecond
t = new ASN1(ASN1.GeneralizedTime, new ByteString("20050929113422.1", ASCII));
d = t.getDate();
assert(d.toString().substr(0,24) == "Thu Sep 29 2005 11:34:22");

// UTC time with millisecond
t = new ASN1(ASN1.GeneralizedTime, new ByteString("20050929113422.1Z", ASCII));
d = t.getDate();
assert(d.getTime() == 1127993662001);
	    
// CEST time with millisecond
t = new ASN1(ASN1.GeneralizedTime, new ByteString("20050929133422.1+0200", ASCII));
d = t.getDate();
assert(d.getTime() == 1127993662001);

setName()

Prototype

setName(String name)

Description

Assign a name to the ASN.1 object.

Return

Exceptions

Name	Value	Description
GPError	GPError.INVALID_ARGUMENTS	Too many arguments in call

Example


t = new ASN1(ASN1.SEQUENCE);
t.setName("testObject");
print(t.toString());

ASN1.defineObjectIdentifier()

Prototype

defineObjectIdentifier(String name, String definition)

Description

Add a definition for a symbolic object identifier to the internal registry.

The definition may be recursive and can use the dotted or spaced format.

Return

Exceptions

Name	Value	Description
GPError	GPError.INVALID_ARGUMENTS	Too many arguments in call

Example


ASN1.defineObjectIdentifier("openscdp-test", "1.3.6.1.4.1.24991.0");
ASN1.defineObjectIdentifier("openscdp-test-sub1", "openscdp-test.4");
ASN1.defineObjectIdentifier("openscdp-test-sub2", "openscdp-test branch(5)");

var b = new ByteString("openscdp-test-sub2", OID);
print(b);
assert(b.toString(OID) == "1.3.6.1.4.1.24991.0.5");

toString()

Prototype

String toString()

Description

Dump the contents of the ASN.1 object

Return

String Dump of ASN.1 object

Exceptions

Name	Value	Description
GPError	GPError.ARGUMENTS_MISSING	Too few arguments in call
GPError	GPError.INVALID_ARGUMENTS	Too many arguments in call
GPError	GPError.INVALID_TYPE	Argument must be of type Number and either Card.RESET_COLD or Card.RESET_WARM

Example


t = new ASN1(ASN1.SEQUENCE);
t.add(new ASN1(ASN1.OBJECT_IDENTIFIER, new ByteString("2A1200", HEX)));
print(t.toString());