Version 1: Release Note 28 November 2014


Construction of the Unique Transaction Reference Number (UTRN)



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Construction of the Unique Transaction Reference Number (UTRN)


The Unique Transaction Reference Number (UTRN) shall be a 20 decimal digit which shall be the 19 decimal digits of the PPTD with a 20th decimal digit which shall be appended after the least significant digit of the 19 decimal digit representation of PPTD. This 20th decimal digit shall be the UTRN Check Digit. The UTRN Check Digit shall be calculated according to the requirements of Section 14.8.
      1. Construction of the PTUT Supplier MAC


The PTUT Supplier MAC shall only be calculated once the 32 most significant bits of PTUT (bits 63-32 of the PTUT) have been populated as per the requirements of Section 14.3.2.

The Remote Party, whose Security Credentials are stored against the Supplier role of the target Device, shall calculate a MAC using the parameters in Table 14.3.4 then setting the PTUT Supplier MAC to be the 32 least significant bits of the 128 bit MAC produced by the MAC calculation.



Input Parameter

Value

Note

To calculate the Shared Secret (‘Z’) input to the KDF:

Private Key Agreement Key

Supplier’s Prepayment Top Up Key Agreement Key [which the Supplier may elect to be different than the Key Agreement Key they use for other interactions with the Device]




Public Key Agreement Key

Device’s




The other input to the KDF (‘OtherInfo’) shall be calculated according to the requirements of Section 4.3.3.3.




As input to the GMAC function, the IV shall be constructed according to the requirements of Section 4.3.3.4, the Plaintext shall be empty and:

Additional Authenticated Data shall be the concatenation:

0x11 || Message Identifier || 32 most significant bits of the PTUT




Table 14.3.4: Calculation of the PTUT Supplier MAC

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