is the second (between Tspi_TPM_DAA_JoinInit() and Tspi_TPM_DAA_JoinStoreCredential())
out of 3 functions to execute in order to receive a DAA Credential.
It computes the credential request for the DAA Issuer, which also includes the Platformss
DAA public key and the attributes that were chosen by the Platform, and which are not visible
to the DAA Issuer. The Platform can commit to the attribute values it has chosen.