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3.2.2.6.2.1.2.6 Processing Rules for Providing a Challenge Response to an Initial Key Attestation Request

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If processing for initial key attestation request, as specified in section 3.2.2.6.2.1.2.5, is successful, the CA MUST create the response as show below:

  1. The CA MUST generate a random secret of 32 bytes and encrypt the secret into a challenge using the szOID_ENROLL_ATTESTATION_STATEMENT attribute.

  2. The CA MUST encrypt the secret with a current CA exchange certificate private key and store it in the AttestationChallenge column of the Request table ([MS-CSRA] section 3.1.1.1.2).

  3. The CA MUST set the Request_Request_Flags column to CR_FLG_CHALLENGEPENDING as specified in [MS-CSRA] section 3.1.1.1.2.

  4. The CA MUST send a CMC full PKI response including a CA exchange certificate and its full chain.

  5. The CA MUST also include additional attributes as specified in section 2.2.2.8.1 where pdwDisposition is set to request pending (5).