Version 1: Release Note 28 November 2014



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Processing stages

  1. Processing stages defined in the superordinate Message Category


There are no processing stages defined in the superordinate Message Category (SME.A).
        1. Processing stages defined in subordinate categories


There are no requirements for the Alert Construction processing stage as they are wholly defined in subordinate categories.
      1. Alert Cryptographic Protection


Requirements in this Section 6.8.3 shall apply to Message Category SME.A.NC and all subordinate categories.

The Device shall calculate the Device to Known Remote Party MAC (SMD-KRP MAC) using the parameters in Table 6.8.3.



Input Parameter

Value

Note

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

Private Key Agreement Key

Device’s




Public Key Agreement Key

Known Remote Party’s

As held by the Device in the relevant Trust Anchor Cell {remotePartyRole, keyAgreement, management}. The relevant Trust Anchor Cell will contain Business Originator ID as specified in Message Identifier.

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 || Grouping Header || Alert Payload || 0x00




Table 6.8.3: Calculation of the Device to Known Remote Party MAC

The SMD-KRP MAC for incorporation in the Alert shall only be calculated once all fields of the Alert, except for the SMD-KRP MAC itself, are populated as per requirements for the Alert Construction stage, for the Message in question.



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