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 Platforms's 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.
hDAAThe hDAA parameter is used to specify the handle of the DAA object.
hTPMThe hTPM parameter is the handle to the TPM object.
authenticationChallengeLengthThe authenticationChallengeLength parameter is length of authenticationChallenge (256 bytes - DAA_SIZE_NE1).
authenticationChallengeThe authenticationChallenge parameter is the second nonce of the DAA Issuer that is encrypted by the endorsement public key. It is used as a challenge to authenticate the underlying TPM.
nonceIssuerLengthThe nonceIssuerLength parameter is the length of nonceIssuer (20 bytes).
nonceIssuerThe nonceIssuer parameter is the nonce of the DAA Issuer.
attributesPlatformLengthThe attributesPlatformLength parameter is length of attributesPlatform array, which is determined by the DAA Issuer public key (). The length of a single attribute is ln/8. ln is defined as the size of the RSA modulus (2048).
attributesPlatformThe attributesPlatform parameter is an array of attributes to be encoded into the DAA Credential not visible to the DAA Issuer.
joinSessionThe joinSession parameter is a structure containing the DAA Join session information.
credentialRequestThe credentialRequest parameter is the credential request of the Platform, it contains the blinded DAA public key of the platform on which the DAA Issuer will issue the credential the blinded attributes chosen by the Platform.
Tspi_TPM_DAA_JoinCreateDaaPubKey returns TSS_SUCCESS on success, otherwise one of the following values is returned:
- Either the DAA is not valid.
An internal SW error has been detected.
Tspi_TPM_DAA_JoinCreateDaaPubKey conforms to the Trusted Computing Group Software Specification version 1.2