Reply To: Basic Tutorial for MIFARE Classic 1K using C#, C++ etc.

[mifaresdk]

Hi NTMS,

it seems you are using a proprietary class library. Let us assume you have a blank MIFARE Classic card. On a MIFARE Classic you have sectors with 4 blocks. Each block has the capacity of 16 bytes. The last block in a sector is the sector trailer and contains the keys. So you can use only the first 3 blocks for saving your data.

For the details, please visit:
http://www.nxp.com/documents/data_sheet/MF1S50YYX_V1.pdf

I do not know how the key store is implemented in your library but the scheme for interacting with the card in general could look like this:

char *pDefaultKey = "FFFFFFFFFFFF";

char *pDataToWrite = "00112233445566778899AABBCCDDEEFF"

char readBuffer[16];



openReader();    // Open the reader interface

connect();       // Connect to the card, if no card is detected, an error is returned!



authenticate( MIFARE_KEY_TYPE_A, 4, ... ); // Authenticate to sector 1 (block 4) with key A

updateBlock( 4, sizeof( pDataToWrite ), pDataToWrite ); // Write data to block 4

readBlock( 4, sizeof( readBuffer ), readBuffer );      // Read data from block 4



authenticate( MIFARE_KEY_TYPE_A, 8, ... ); // Authenticate to sector 2 (block 8) with key A

readBlock( 8, sizeof( readBuffer ), readBuffer );      // Read data from block 8



disconnect();    // Close connection

closeReader();   // Close interface

The variable

pDefaultKey

contains the factory key for a blank card. You have to authenticate to each sector you want to have access. But you can change the access conditions in the sector trailer – and also the keys.

Your library deals with key over the key store. So you have to load the default key into the key store and use the key store reference for the authentication method.

The MIFARE Team

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