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NFC-Tools Api

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NFC-Tools Api

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Table of contents

• Mifare Classic 1k

• NFC-Tools Api

• Demo

• Exercises

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Mifare Classic 1k description

• 16 sectors, each sector contains 4 blocks,

• 3 user blocks (block 0 to 2) and one key block (block 3)

• Sector 0 block 0 cannot be used (contains manufactory data)

• Each block contains 16 bytes.

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Memory organization

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Memory organization

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Manufacturer block

• Programmed and write protected during production

• Non unique Identifier

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User’s blocks

• Two types of user’s blocks (Data block and Value Block)

• Data block has no memory structure (read/write block)

• Value Block has a memory structure with a value and an address

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Sector Trailer

• At chip delivery keys are set to FFFFFFFFFFFFh

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Memory Access

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Access conditions

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Access conditions for sector trailer

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Access conditions for data blocks

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NFC-Tools Api

• Class TerminalHandler

• Methods

▫ void addTerminal(Terminal)

▫ Terminal getAvailableTerminal(String) Example:

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NFC-Tools Api

• Class NfcAdapter

• Constructor NfcAdapter(Terminal, TerminalMode)

• Methods

▫ void registerTagListener (NfcTagListener)

▫ void startListening ()

▫ void stopListening ()

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NFC-Tools Api for Mifare

• Class AbstractCardTool which implements

NfcTagListener (generally we inherit from this class and redefine the method “doWithReaderWriter”)

• Class MfClassicAccess

Constructor MfClassicAccess(KeyValue, int sector, int block, int blocksToRead)

• Class MfBlock

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NFC-Tools Api

• Class MfClassicReaderWriter

• Methods

▫ void writeBlock (MfClassicAccess , MfBlock)

▫ MfBlock[] readBlock(MfClassicAccess )

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NFC-Tools Api

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Exercise 1

• Create an application which writes the value 2014 hex to the sector 4 block 0

• Modify the application that we saw in the demo to read only the sector 4 block 0

• The API (jar files) is accessible here:

▫ http://cedric.cnam.fr/~bouzefra/cours/Api.zip

• The program that reads a Mifare tag is accessible

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Exercise 2

• Modify the application of writing to write the

trailer sector of sector 4 (change the value of key A to FFFFFFFFFFFE hex) DO NOT CHANGE

THE ACCESS BYTES

• Run the application of reading (what do you see?)

• Modify the application of reading in order to

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References

• [MF1] MF1S503x Manual

• [GRU] https://github.com/grundid/nfctools

• [ACR] ACR122 and ACR128 Manual

• http://cedric.cnam.fr/~bouzefra/cours/Api.zip

• http://cedric.cnam.fr/~bouzefra/cours/Tag_Lecture.zip

• http://cedric.cnam.fr/~bouzefra/cours_smos.html

Références

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