CODEWITHSUNDEEP
nfcapduhceemv
user5152421
user5152421

Reputation:

How to find AID number of my local transportation card?

I have a transportation card for urban transportation. I need to know what aid(application identifier) number of the card is. According to EMV Book 1, i have to use the List of AIDs method (page 141). But how?

I also have a ACR122U card reader. I can send an APDU command to the card. All i need is the AID of the card. In addition, i always get SW=6A82 error. It means "File Not Found". I suppose, i need to know true AID number to solve this problem. I want to see SW=9000 (successful) response...

Edit: Code for creating select apdu command 

private static final byte[] CLA_INS_P1_P2 = { 0x00, (byte)0xA4, 0x04, 0x00 };
private static final byte[] AID_ANDROID = { (byte)0xF0, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06 };

private byte[] createSelectAidApdu(byte[] aid) {
    byte[] result = new byte[6 + aid.length];
    System.arraycopy(CLA_INS_P1_P2, 0, result, 0, CLA_INS_P1_P2.length);
    result[4] = (byte)aid.length;
    System.arraycopy(aid, 0, result, 5, aid.length);
    result[result.length - 1] = 0;
    return result;
}

Thanks..

Upvotes: 3

Views: 3165

Answers (1)

DANG Fan
DANG Fan

Reputation: 864

Typically, you should lookup the card documentation, which should describe how files organized.

However, since you're reading an ISO-DEP card, you may refer to ISO/IEC CD 7816-4. The card should implement part of instructions in this standard. According to Section 5.2, the file can be chosen using its identifier, which means you are able to enumerate all files located in MF.

So a possible solution is:

  1. Send select file by identifier instruction as

    00 A4 00 00 02 id 00

    Where id ranges from 0000 to FFFF.

  2. Once you receive SW=9000, the response should contain file control information (FCI, see Section 5.6). You can then find the DF name after byte 84. For example, a card responds

    6F 15 84 0D 4E 43 2E 65 43 61 72 64 2E 44 46 30 31 A5 04 9F 08 01 02 90 00,

    the DF name is 4E 43 2E 65 43 61 72 64 2E 44 46 30 31. The byte 0D after 84 indicates the length of DF name is 0x0D. You may use it as AID.

Upvotes: 4

Related Questions