I read transaction log to calculate floor limits in terminal risk management. I successfully read transaction log of EMV card with length is 10 lines, but why the EMV-tags of that result is not recognized when parsed it with TLV Parser?
EMV-tags: 4092 is not recognized by TLV Parser?
1.Log Format
REQ LOG_FORMAT: 80CA9F4F00
RES LOG_FORMAT: 9F4F289F27019F26088A029F02069F03069F1A0295055F2A029A039C019F370482029F36029F10209F6B30 9000
LogFormat is success
2.Log Entry
After select AID, I get log entry as follows 0B 0A
3.Transaction Log
REQ TRANS_LOG: 00B2015C00
RES TRANS_LOG: 4092AFED093EB371AC3030000030000000000000000000036080800480000360190519017B3B91CF7400000D01016100000000516D54FA000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 9000
//More transaction log in here
Transaction Log is success
Transaction Log code:
private List<IApdu.IApduResp> readTransactionLog(byte[] logEntry) {
try {
if (logEntry.length != 2) {
return null;
}
List<IApdu.IApduResp> apduRespList = new ArrayList<>();
int sfi = logEntry[0] & 0xFF; // 11
int rows = logEntry[1] & 0xFF; // 10 rows
int successCount = 0;
for (int row = 1; row <= rows; row++) {
IApdu.IApduReq req = APDU.createReq((byte) 0x00, (byte) 0xB2, (byte) row, (byte) ((sfi << 3) | 0x04));
if (req == null) {
break;
}
Log.i(TAG, "REQ TRANS_LOG: " + row + " " + sfi + " : " + bcdToStr(req.pack()));
byte[] cmd = isoCommand(req.pack());
if (cmd == null) {
return null;
}
IApdu.IApduResp unpack = APDU.unpack(cmd);
if (unpack == null) {
return null;
}
Log.i(TAG, "RES TRANS_LOG: " + bcdToStr(unpack.getData()) + " " + unpack.getStatusString());
if (unpack.getStatusString().equals("9000")) {
++successCount;
apduRespList.add(unpack);
} else if (unpack.getStatusString().equals("6A83")) {
break;
}
}
if (successCount > 0) {
transLogResponse.setApduResponse(apduRespList);
return apduRespList;
}
} catch (Exception ex) {
ex.printStackTrace();
}
return null;
}
Tag 0x9F4F Log Format define sequence of Tag + Length pairs. In other words the Value of Tag 0x9F4F contains TLs - the sequence of TL(1) + TL(2) + TL(3) + ... + TL(n).
Transaction Log contain the sequence of Values for the correspondent Tags with mentioned lengths, i.e. Vs - the sequence of V(1) + V(2) + V(3) + ... + V(n).
Log Format parsing
TLV:#"9F4F289F27019F26088A029F02069F03069F1A0295055F2A029A039C019F..6B30" # EMV, Tag + Length + Value (TLV) series
- x9F4F:#"9F4F289F27019F26088A029F02069F03069F1A0295055F2A029A039C019F..6B30" # EMV, Log Format
- tag: "9F4F"
- len: "28" # // 40
- val:#"9F27019F26088A029F02069F03069F1A0295055F2A029A039C019F370482..6B30" # Log Format.
- x9F27:#"9F2701" # EMV, Cryptogram Information Data (CID)
- tag: "9F27"
- len: "01" # // 1
- x9F26:#"9F2608" # EMV, Cryptogram, Application
- tag: "9F26"
- len: "08" # // 8
- x8A:#"8A02" # EMV, Authorization Response Code (ARC)
- tag: "8A"
- len: "02" # // 2
- x9F02:#"9F0206" # EMV, Authorised Amount (Numeric)
- tag: "9F02"
- len: "06" # // 6
- x9F03:#"9F0306" # EMV, Amount, Other (Numeric)
- tag: "9F03"
- len: "06" # // 6
- x9F1A:#"9F1A02" # EMV, Country Code, Terminal
- tag: "9F1A"
- len: "02" # // 2
- x95:#"9505" # EMV, Terminal Verification Results (TVR)
- tag: "95"
- len: "05" # // 5
- x5F2A:#"5F2A02" # ISO 7816, Currency Code, Transaction
- tag: "5F2A"
- len: "02" # // 2
- x9A:#"9A03" # EMV, Date, Transaction
- tag: "9A"
- len: "03" # // 3
- x9C:#"9C01" # EMV, Transaction Type
- tag: "9C"
- len: "01" # // 1
- x9F37:#"9F3704" # EMV, Unpredictable Number
- tag: "9F37"
- len: "04" # // 4
- x82:#"8202" # EMV, Application Interchange Profile (AIP)
- tag: "82"
- len: "02" # // 2
- x9F36:#"9F3602" # EMV, Application Transaction Counter (ATC)
- tag: "9F36"
- len: "02" # // 2
- x9F10:#"9F1020" # EMV, Issuer Application Data (IAD)
- tag: "9F10"
- len: "20" # // 32
- x9F6B:#"9F6B30"
- tag: "9F6B"
- len: "30" # // 48
Transaction Log data parsing
data:#"4092AFED093EB371AC3030000030000...0000"
- x9F27:
- val: "40" # Cryptogram Information Data (CID).
# 01______ - bits 8-7, TC
# _____000 - bits 3-1, (Reason/Advice/Referral Code), No information given
- x9F26:
- val: "92AFED093EB371AC" # Cryptogram, Application.
- x8A:
- val: "3030" # Authorization Response Code (ARC). // 00 - Approved
- x9F02:
- val: "000030000000" # Amount, Authorised (Numeric). // 30000000
- x9F03:
- val: "000000000000" # Amount, Other (Numeric).
- x9F1A:
- val: "0360" # Country Code, Terminal. // 360 - Indonesia
- x95:
- val:#"8080048000" # Terminal Verification Results (TVR).
- B01: "80"
# 1_______ - bit 8, Offline data authentication was not performed
- B02: "80"
# 1_______ - bit 8, ICC and terminal have different application versions
- B03: "04"
# _____1__ - bit 3, Online PIN entered
- B04: "80"
# 1_______ - bit 8, Transaction exceeds floor limit
- B05: "00"
- x5F2A:
- val: "0360" # Currency Code, Transaction. // 360 - Rupiah
- x9A:
- val: "190519" # Date, Transaction. // 2019.05.19
- x9C:
- val: "01" # Transaction Type. // cash
- x9F37:
- val: "7B3B91CF" # Unpredictable Number (UN), Terminal.
- x82:
- val:#"7400" # Application Interchange Profile (AIP).
- B01: "74"
# _1______ - bit 7, SDA supported
# __1_____ - bit 6, DDA supported
# ___1____ - bit 5, Cardholder verification is supported
# _____1__ - bit 3, Issuer Authentication is supported
- B02: "00" # RFU
- x9F36:
- val: "000D" # Application Transaction Counter (ATC). // 13
- x9F10:
- val: "01016100000000516D54FA000000000000000000000000000000000000000000" # Issuer Application Data (IAD).
- x9F6B:
- val: "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"