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[ikarus23]

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[Hasanov07]

Hello, how can I get a checksum for the mifari classic 1k card
UID: 045B277A943480
45FE3004D555AE300108F4F9A8560002
000000000000000000000000A2DF7DAA
000000000000000000000000A2DF7DAA
AE3D65A3DAD4787788000F1C63013DBA

A2DF7DAA checksum How many times have I tried to get it right, but I couldn't. If the checksum is not correct, the card does not work, I need to calculate the checksum correctly so that the card works, please help me, thank you very much in advance

[ikarus23]

Hi. Next time, please open a new discussion and not use this common introduction.

Regarding to your question: Looks like a common CRC32 with some custom polynomial/initial value/final xor. But it is hard to tell if all input data are 0000.... Do you have other samples where the data is not zeros?

[Hasanov07]

Hi. Next time, please open a new discussion and not use this common introduction.

Regarding to your question: Looks like a common CRC32 with some custom polynomial/initial value/final xor. But it is hard to tell if all input data are 0000.... Do you have other samples where the data is not zeros?

No, it's not zero, it's a regular Mythari classic card.