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TLV - Reference Documentation

Implementation of an immutable TLV object with different encoding formats.

Index of Methods

• TLV() constructor
• getL()
• getLV()
• getTag()
• getTLV()
• getTV()
• getValue()

Constants

Type	Name	Description
Number	EMV	EMV encoding format, which follows ASN.1 / DER encoding rule
Number	DGI	DGI encoding format using a 2 byte tag and a one or three byte length field
Number	L16	L16 encoding format using a 2 byte tag and a two byte length field

Properties

Type	Name	Description
Number	encodingMode	Encoding mode used for TLV object. One of TLV.EMV, TLV.DGI or TLV.L16
Number	size	Combined length of tag, length and value field

Constructor

Prototype

TLV(Number tag, ByteString value, Number encoding)

Description

Create a TLV object initialized with the arguments given.

TLV objects are composed of a tag, a length and a value field. The binary encoding format for the tag and length can be defined with the encoding parameter.

For EMV encoding the tag field has a variable length of up to 4 bytes. The length field has a variable length of up to 4 byte. Both fields are encoded as specified as per ASN.1 Basic Encoding Rule (ISO 8825).

For DGI encoding the tag field has a fixed length of two bytes. The length field contains one byte for values between 0 and 254. The length is encoded in three bytes for values between 255 and 65535, with the first byte set to 'FF'.

For L16 encoding the tag field has a fixed length of two bytes. The length field is always two byte long and is encoded in big endian / little endian format.

Arguments

Type	Name	Description
Number	tag	Tag value
ByteString	value	Value field of TLV object
Number	encoding	Encoding for tag and length field. Must be one of TLV.EMV, TLV.DGI or TLV.L16.

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_ENCODING	The argument encoding is invalid
GPError	GPError.INVALID_TAG	The tag value is invalid for the selected encoding format
GPError	GPError.DATA_TOO_LARGE	The data supplied for the value fields exceeds the maximum length

Example

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.EMV);
assert(t.encodingMode == TLV.EMV);
assert(t.size == 5);

t = new TLV(0x0601, new ByteString("2A1234", HEX), TLV.EMV);
assert(t.encodingMode == TLV.EMV);
assert(t.size == 6);

try {
	// Invalid tag for EMV	
	t = new TLV(0x6FFFFF, new ByteString("2A1234", HEX), TLV.EMV);
} catch (e) {
	assert(e instanceof GPError);
}

t = new TLV(0x1201, new ByteString("561000", ASCII), TLV.DGI);
assert(t.encodingMode == TLV.DGI);
assert(t.size == 9);

t = new TLV(0x12, new ByteString("561000", ASCII), TLV.DGI);
assert(t.encodingMode == TLV.DGI);
assert(t.size == 9);

t = new TLV(0x3221, new ByteString("123456", HEX), TLV.L16);
assert(t.encodingMode == TLV.L16);
assert(t.size == 7);

t = new TLV(0x32, new ByteString("123456", HEX), TLV.L16);
assert(t.encodingMode == TLV.L16);
assert(t.size == 7);

getL()

Prototype

ByteString getL()

Description

Return the value of the length field of the TLV object.

Return

ByteString

The length field of the object

Exceptions

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

Example

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.EMV);
assert(t.getL().toString(HEX) == "03");

// 130 bytes
t = new TLV(0x06, new ByteString(
    "00010203040506070809000102030405060708090001020304050607080900010203040" + 
    "50607080900010203040506070809000102030405060708090001020304050607080900" +
    "01020304050607080900010203040506070809000102030405060708090001020304050" +
    "60708090001020304050607080900010203040506070809", HEX), TLV.EMV);
assert(t.getL().toString(HEX) == "8182");

// 260 bytes
t = new TLV(0x06, new ByteString(
    "00010203040506070809000102030405060708090001020304050607080900010203040" +
    "50607080900010203040506070809000102030405060708090001020304050607080900" +
    "01020304050607080900010203040506070809000102030405060708090001020304050" +
    "60708090001020304050607080900010203040506070809000102030405060708090001" +
    "02030405060708090001020304050607080900010203040506070809000102030405060" +
    "70809000102030405060708090001020304050607080900010203040506070809000102" +
    "03040506070809000102030405060708090001020304050607080900010203040506070" +
    "80900010203040506070809", HEX), TLV.EMV);
assert(t.getL().toString(HEX) == "820104");

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.L16);
assert(t.getL().toString(HEX) == "0003");

t = new TLV(0x06, new ByteString(
    "00010203040506070809000102030405060708090001020304050607080900010203040" +
    "50607080900010203040506070809000102030405060708090001020304050607080900" +
    "01020304050607080900010203040506070809000102030405060708090001020304050" +
    "60708090001020304050607080900010203040506070809000102030405060708090001" +
    "02030405060708090001020304050607080900010203040506070809000102030405060" +
    "70809000102030405060708090001020304050607080900010203040506070809000102" +
    "03040506070809000102030405060708090001020304050607080900010203040506070" +
    "80900010203040506070809", HEX), TLV.L16);
assert(t.getL().toString(HEX) == "0104");

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.DGI);
assert(t.getL().toString(HEX) == "03");

t = new TLV(0x06, new ByteString(
    "00010203040506070809000102030405060708090001020304050607080900010203040" +
    "50607080900010203040506070809000102030405060708090001020304050607080900" +
    "01020304050607080900010203040506070809000102030405060708090001020304050" +
    "60708090001020304050607080900010203040506070809000102030405060708090001" +
    "02030405060708090001020304050607080900010203040506070809000102030405060" +
    "70809000102030405060708090001020304050607080900010203040506070809000102" +
    "03040506070809000102030405060708090001020304050607080900010203040506070" +
    "80900010203040506070809", HEX), TLV.DGI);
assert(t.getL().toString(HEX) == "FF0104");

getLV()

Prototype

ByteString getLV()

Description

Return the combined length and value field of the object

Return

ByteString

The combined length and value field

Exceptions

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

Example

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.EMV);
assert(t.getLV().toString(HEX) == "032A1234");

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.L16);
assert(t.getLV().toString(HEX) == "00032A1234");

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.DGI);
assert(t.getLV().toString(HEX) == "032A1234");

getTag()

Prototype

Number getTag()

Description

Return the value of the tag field as numeric value-

Return

Number

Numeric value of the tag field

Exceptions

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

Example

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.EMV);
assert(typeof(t.getTag()) == "number");
assert(t.getTag() == 0x06);

t = new TLV(0x9F03, new ByteString("2A1234", HEX), TLV.EMV);
assert(typeof(t.getTag()) == "number");
assert(t.getTag() == 0x9F03);

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.L16);
assert(t.getTag() == 0x06);

t = new TLV(0x061F, new ByteString("2A1234", HEX), TLV.DGI);
assert(t.getTag() == 0x061F);

getTLV()

Prototype

ByteString getTLV()

Description

Return the concatenation of tag, length and value as a sequence of byte using the encoding mode specified in the constructor

Return

ByteString

The concatenation of tag, length and value

Exceptions

Name	Value	Description

Example

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.EMV);
assert(t.getTLV().toString(HEX) == "06032A1234");

t = new TLV(0x1201, new ByteString("561000", ASCII), TLV.DGI);
assert(t.getTLV().toString(HEX) == "120106353631303030");

t = new TLV(0x3221, new ByteString("123456", HEX), TLV.L16);
assert(t.getTLV().toString(HEX) == "32210003123456");

getTV()

Prototype

ByteString getTV()

Description

Return the field tag and value of the TLV in the specified encoding format.

Return

ByteString

Concatenated tag and length field

Exceptions

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

Example

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.EMV);
assert(t.getTV().toString(HEX) == "062A1234");

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.L16);
assert(t.getTV().toString(HEX) == "00062A1234");

t = new TLV(0x061F, new ByteString("2A1234", HEX), TLV.DGI);
assert(t.getTV().toString(HEX) == "061F2A1234");

getValue()

Prototype

ByteString getValue()

Description

Return the value field of the TLV object

Return

ByteString

The value field of the TLV object

Exceptions

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

Example

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.EMV);
assert(t.getValue().toString(HEX) == "2A1234");

t = new TLV(0x06, new ByteString("2A1234", HEX), TLV.L16);
assert(t.getValue().toString(HEX) == "2A1234");

t = new TLV(0x061F, new ByteString("2A1234", HEX), TLV.DGI);
assert(t.getValue().toString(HEX) == "2A1234");

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