Forum Replies Created

  • Re: Reply To: the problem with ChangeKey at DesFire EV1

    4. November 2016 at 9:52
    in reply to: the problem with ChangeKey at DesFire EV1
    I found my fault,My CBC mode are wrong.
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    Re: Reply To: the problem with ChangeKey at DesFire EV1

    12. October 2016 at 6:01
    in reply to: the problem with ChangeKey at DesFire EV1
    oh God,I wrote a lot of content has disappeared.
    here is my detail completly:

    Authenticate : (with key number 0x00)

    to PICC :0A 00
    from PICC:AF 63 C5 4D CF 6F 3A 6F C9
    to PICC :AF 49 1E 89 0D E9 AC E9 32 9C 5C 6D 55 D9 FA 36 D7
    from PICC:00 B7 D1 DA 7C E0 DD 98 6B

    I'm success in Authenticate, and get SessionKey 00 01 02 03 f6 b0 33 39(for easy to read the Key I set the RndA = 00 01 02 03 04 05 06 07).

    next I send the ChangeKetSettings, set the keySetting to 0x0f. I get the CRC of 0x0f is 0x09,0xa9, so my SendData is 0f 09 a9 00 00 00 00 00
    then i do DECRYPT with SendData , the result is cb 64 3f d0 30 e6 87 da

    to PICC :54 CB 64 3F D0 30 E6 87 DA
    from PICC:00

    success! so is My Des code and CRC code are Correct ?

    next i send the ChangeKey, I want to change the key 00 (master key), and I Authenticated with key 00 successful, so according to the document I need to send 16Byte New Key + 2Byte CRC + 6Byte 0x00
    New Key = 11 22 33 44 55 66 77 88 11 22 33 44 55 66 77 88
    Get the CRC = F 02
    so SendData = 11 22 33 44 55 66 77 88 11 22 33 44 55 66 77 88 BF 02 00 00 00 00 00 00
    then i do DECRYPT with SendData , the result = ce 27 61 0e 8c 09 01 39 df 05 52 4a d9 6f 76 b1 9a 18 52 e9 12 68 12 e3

    to PICC :c4 00 ce 27 61 0e 8c 09 01 39 df 05 52 4a d9 6f 76 b1 9a 18 52 e9 12 68 12 e3
    from PICC:1E

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    Re: Reply To: Mifare Desfire EV1 ChangeKey 0x1E error

    9. October 2016 at 10:19
    in reply to: Mifare Desfire EV1 ChangeKey 0x1E error
    Hi,

    Do you Solve this Problem? I have the same problem now.
    can you show the CRC calulation code ?
    Thanks for help.
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