DK PIN methods

The DK PIN methods use a PIN reference value or word (PRW) to verify PINs rather than regenerating the PIN from customer account data.

The PRW is generated by concatenating the customer PAN data, the issuer card data, the PIN length, the PIN, and a 4-byte random number. It is encrypted using a PRW key with the GENONLY key usage. The PRW and random number are the output of the generation. The PIN is verified by generating the PRW using a PRW key with the VERIFY key usage and comparing it against the supplied PRW and random number.