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Tspi_TPM_DAA_JoinCreateDaaPubKey(3)	   Tspi_TPM_DAA_JoinCreateDaaPubKey(3)

		   TCG Software Stack Developer's Reference

NAME
       Tspi_TPM_DAA_JoinCreateDaaPubKey  - computes the credential request for
       the DAA Issuer

SYNOPSIS
       #include <tss/tss_typedef.h>
       #include <tss/tss_structs.h>
       #include <tss/tspi.h>

       TSS_RESULT Tspi_TPM_DAA_JoinCreateDaaPubKey(
	   TSS_HDAA		       hDAA,
	   TSS_HTPM		       hTPM,
	   UINT32		       authenticationChallengeLength,
	   BYTE*		       authenticationChallenge,
	   UINT32		       nonceIssuerLength,
	   BYTE*		       nonceIssuer,
	   UINT32		       attributesPlatformLength,
	   BYTE**		       attributesPlatform,
	   TSS_DAA_JOIN_SESSION*       joinSession,
	   TSS_DAA_CREDENTIAL_REQUEST* credentialRequest
       );

DESCRIPTION
       Tspi_TPM_DAA_JoinCreateDaaPubKey     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  in-
       cludes the Platforms's DAA public key and the attributes that were cho-
       sen by the Platform, and which are not visible to the DAA  Issuer.  The
       Platform can commit to the attribute values it has chosen.

PARAMETERS
   hDAA
       The hDAA parameter is used to specify the handle of the DAA object.

   hTPM
       The hTPM parameter is the handle to the TPM object.

   authenticationChallengeLength
       The  authenticationChallengeLength  parameter  is length of authentica-
       tionChallenge (256 bytes - DAA_SIZE_NE1).

   authenticationChallenge
       The 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.

   nonceIssuerLength
       The nonceIssuerLength  parameter  is  the  length  of  nonceIssuer  (20
       bytes).

   nonceIssuer
       The nonceIssuer parameter is the nonce of the DAA Issuer.

   attributesPlatformLength
       The  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).

   attributesPlatform
       The attributesPlatform parameter is an array of attributes to be encod-
       ed into the DAA Credential not visible to the DAA Issuer.

   joinSession
       The  joinSession  parameter is a structure containing the DAA Join ses-
       sion information.

   credentialRequest
       The credentialRequest parameter is the credential request of the  Plat-
       form,  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.

RETURN CODES
       Tspi_TPM_DAA_JoinCreateDaaPubKey returns TSS_SUCCESS on success, other-
       wise one of the following values is returned:

       TSS_E_INVALID_HANDLE
	      Either the DAA is not valid.

       TSS_E_BAD_PARAMETER

       TSS_E_INTERNAL_ERROR
	      An internal SW error has been detected.

CONFORMING TO
       Tspi_TPM_DAA_JoinCreateDaaPubKey  conforms  to  the  Trusted  Computing
       Group Software Specification version 1.2

SEE ALSO
       Tspi_TPM_DAA_JoinInit(3) Tspi_TPM_DAA_JoinStoreCredential(3)

TSS 1.2 			  2006-09-0Tspi_TPM_DAA_JoinCreateDaaPubKey(3)