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  • Re: Reply To: DesfireEV1 Change the Default DES Key (all 0's) to AES

    8. August 2016 at 18:31     in reply to: DesfireEV1 Change the Default DES Key (all 0's) to AES

    Sandra Fuchs
    Dear User,

    What I can see here is that you forget to include the KeyVersion into the data preparation before encryption. When updating a key from 2K3DES or 3K3DES to AES, the 16 bytes long key needs to be concatenated with the key version (which I guess is 00 in your case), the CRC16, and filled up with padding in order to reach a multiple of the blocksize.

    The data to encrypt would look like this = 0000000000000000000000000000000000 C8B60000000000, so one more bytes of zeros needs to be added before the CRC16 and the padding.
    Afterwards you need to encrypt it and send the command Cmd = C4 || encrypted data.

    I hope with including the key version it is working for you.

    Best regards,
    Sandra
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