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[Jagesh Maharjan]

Hi Support,

I have solved the problem.

Thank you very much for your support and effort. Really appreciate it.

Bye

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[Jagesh Maharjan]

Hi Support,

Thanks for your effort.

In the above posts (code snippets) you are using the default key for authentication.

If you change the default AES key to the custom then your code should also fail.

In my code if I use default AES key (all zeros) then everything works. But I am not using default keys. I have changed the keys after creating application.

Can you try to write and read after changing the default key.

Thanks

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[Jagesh Maharjan]

Hi Support,

Thanks for the reply.

Remember I am working with DesFire EV2 card and commitTransaction is executed after writeData. Even in the first post(code snippet) i had included commitTransaction.

Below is my code snippet and output.

desFireEV2.selectApplication(APP_ID);

desFireEV2.authenticateEV2First(0, SampleAppKeys.MASTER_AES(), new byte[]{0, 0, 0, 0, 0, 0});



desFireEV2.createFile(backupFileNo, new DESFireFile.BackupDataFileSettings(

                    IDESFireEV1.CommunicationType.MACed, (byte) 0x1, (byte) 0x2, (byte) 0x2, (byte) 0x0,

                    backupFileSize));

mStringBuilder.append("Created Files \n\n");

desFireEV2.authenticateEV2First(1, SampleAppKeys.KEY1_AES(), new byte[]{0, 0, 0, 0, 0, 0});

mStringBuilder.append(Utilities.dumpBytes(desFireEV2.readData(backupFileNo,

                    0, 6, IDESFireEV1.CommunicationType.MACed, 128))).append("\n");



desFireEV2.authenticateEV2First(2, SampleAppKeys.KEY2_AES(), new byte[]{0, 0, 0, 0, 0, 0});

            byte[] userData = userJson.getBytes(encode);

desFireEV2.writeData(backupFileNo, 0, userData, IDESFireEV1.CommunicationType.MACed);

desFireEV2.commitTransaction();



desFireEV2.authenticateEV2First(1, SampleAppKeys.KEY1_AES(), new byte[]{0, 0, 0, 0, 0, 0});

mStringBuilder.append("Data read from backup: \n")

                    .append(Utilities.dumpBytes(desFireEV2.readData(backupFileNo,

                            0, 6, IDESFireEV1.CommunicationType.MACed, 128))).append("\n\n");

mStringBuilder is written to the log.

This is the console log.

2020-04-03 16:37:56.369 10332-10332/com.example.sampleticket I/DemoActivity: Dump Data:Card Detected:DESFireEV2

2020-04-03 16:30:46.478 9862-9862/com.example.sampleticket I/DemoActivity: Dump Data:Created Files 

    

    Data read from backup: 

    0x000000000000

    Data read from backup: 

    0x000000000000

I have tried creating application with TWO_KEY_THREEDES and everything works fine. In just the case of AES, this issue occurs.

Thanks

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[Jagesh Maharjan]

Hi Support,

Thanks for the reply.

According to the documentation readRecords description is following:

byte[] readRecords(int fileNo,

                   int offsetRecords,

                   int noOfRecords)



Parameters:

fileNo - Record file number.

offsetRecords - Offset from which records is read.

noOfRecords - Number of records to read.



Returns:

read records as byte[]

In my code i have

byte[] userData = desFireEV2.readRecords(objectFileNo, 0, 1);

where
objectFileNo is 0,
offsetRecords is 0,
noOfRecords is 1

since i have only written the record once.

I am still receiving the same error.

com.nxp.nfclib.exceptions.InvalidResponseLengthException: Boundary Error

To try your answer i even used readRecords with more parameters which is below.

byte[] readRecords(int fileNumber,

                   int offsetRecords,

                   int numberOfRecords,

                   int recordSize,

                   IDESFireEV1.CommunicationType communicationSettings,

                   int filesize)

But still receiving the same error message.

What am I missing?
Please help.

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[Jagesh Maharjan]

Hi Support,

After much debugging I found out that after

desFireEV2.createFile(1, new DESFireFile.LinearRecordFileSettings(

                    IDESFireEV1.CommunicationType.Enciphered, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,

                    fileSize, 1, 1));

desFireEV2.writeRecord(1, 0, data, IDESFireEV1.CommunicationType.Enciphered);

desFireEV2.commitTransaction();

When I read the file settings with

DESFireFile.LinearRecordFileSettings fileSettings = (DESFireFile.LinearRecordFileSettings) desFireEV2.getFileSettings(1);

And log the result with

Log.i(TAG, "fileSettings: => MaxNumberOfRecords: " + fileSettings.getMaxNumberOfRecords()

                    + " CurrentNumberOfRecords: " + fileSettings.getCurrentNumberOfRecords() +

                    " RecordSize: " + fileSettings.getRecordSize() + " fileType: " + fileSettings.getType());

I am getting the 0 as currentNumberOfRecords

I/DemoActivity: fileSettings: => MaxNumberOfRecords: 3, CurrentNumberOfRecords: 0, RecordSize: 500, fileType: RecordLinear

Why is the currentNumberOfRecords = 0?
I am banging my head to understand.

Thanks in advance.

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[Jagesh Maharjan]

Hi Support,

Thanks for the reply.

I tried as you asked for. But i'm getting the same result.

Below is what i tried after setting MACed communication type during file creation.

byte[] data = {(byte) 0x01, (byte) 0x12, (byte) 0x11};

desFireEV2.writeData(0, 0, data, IDESFireEV1.CommunicationType.MACed);



Utilities.dumpBytes(desFireEV2.readData(0, 0, 6, IDESFireEV1.CommunicationType.MACed, backupFileSize));

I even tried with Enciphered and Plain but produced similar result (0x000000000000).

During the both write and read actions no exceptions are thrown but the data read are all zeroes.

Seems like nothing is being written to the file.
I've been stuck for a week over this.

Please help

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