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CAN'T calculate C-MAC

Algorithm School

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sakkiotto
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CAN'T calculate C-MAC

Post by sakkiotto » Thu Oct 27, 2016 11:22 pm

I am trying to implement SCP02 i=15, I can calculate the C-MAC with DES for the external authenticate command without any problem, but I can not calculate the C-MAC for the second command with the same algorithm. Anyone know where the problem exists?
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cprgolds
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Re: CAN'T calculate C-MAC

Post by cprgolds » Fri Oct 28, 2016 4:31 am

You might use the wrong ICV.
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tomc2016
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Re: CAN'T calculate C-MAC

Post by tomc2016 » Fri Oct 28, 2016 5:03 am

It's possibly because the ICV encryption does not match what your card expects.
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