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why i cannot get the total 18 bytes data? now i can get only 14 bytes data for Mifare plus first authentication.

Question asked by xiong qinghua on May 13, 2018

why i cannot get the total 18 bytes data? now i can get only 14 bytes data for Mifare plus first authentication.

 

now  i can get the following data stream at the Mifare plus card first authentication.

 

+++1111-2::MifarePlusReader_Clrc663_FirstAuth()---- datanum=14,errorReg=-34888

++++1111-3::MifarePlusReader_Clrc663_FirstAuth()----Response Data:
0x12 0x90 0x0e 0xe0 0xe0 0x47 0x3e 0x52 0x21 0x90 0x7c 0x09 0xc6 0xcf
++++1111-4::MifarePlusReader_Clrc663_FirstAuth()---- datanum=14,errorReg=0,statusreg=0

 

the first 0x12 may be the data number for response!!! the second 0x90 may be the status code!!! the following may the  16 bytes random data,but now the random data has only 12 bytes.why?

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