com.cloudpos.card

Class ATR

java.lang.Object

com.cloudpos.card.ATR

public class ATR
extends java.lang.Object

Represents the Answer to Reset (ATR) data of an Integrated Circuit (IC) card. The ATR contains important information, such as communication parameters, that help the Interface Device (IFD) correctly identify the type of IC card and perform appropriate operations.

The ATR data includes both the raw ATR bytes and the Historical Bytes, which provide additional details about the card's properties and characteristics.

Constructor Summary

Constructors

Constructor and Description
ATR(byte[] atr, byte[] histBytes) Constructs an ATR object with the specified ATR data and Historical Bytes.

Method Summary

Modifier and Type	Method and Description
byte[]	getBytes() Retrieves all the ATR data.
byte[]	getHistoricalBytes() Retrieves the Historical Bytes from the ATR.

Methods inherited from class java.lang.Object

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

Constructor Detail

ATR

public ATR(byte[] atr,
           byte[] histBytes)

Constructs an ATR object with the specified ATR data and Historical Bytes.

Parameters:

atr - The raw ATR byte array.

histBytes - The Historical Bytes array.

Method Detail

getBytes

public byte[] getBytes()

Retrieves all the ATR data.

Returns:

A byte array containing the raw ATR data.

getHistoricalBytes

public byte[] getHistoricalBytes()

Retrieves the Historical Bytes from the ATR. These bytes contain information such as the card issuer, card type, operating system, and other data in TLV (Tag-Length-Value) format.

According to ISO/IEC 7816-4, the structure and meaning of Historical Bytes are defined, with a variable length of up to 15 Bytes. EMV specifications further detail the structure of these bytes. However, not all cards necessarily return this data.

Refer to EMV 4.3 Book 1 for Application Independent ICC to Terminal Interface Requirements.

Returns:

A byte array containing the Historical Bytes.