TCG Software Stack Developer's Reference

NAME¶

Tspi_TPM_DAA_Sign - creates a DAA Signature that proofs ownership of the DAA Credential

SYNOPSIS¶

#include <tss/tss_typedef.h>
#include <tss/tss_structs.h>
#include <tss/tspi.h>
 
TSS_RESULT Tspi_TPM_DAA_Sign(
    TSS_HDAA                    hDAA,
    TSS_HTPM                    hTPM,
    TSS_HKEY                    hDaaCredential,
    TSS_DAA_SELECTED_ATTRIB     revealAttributes,
    UINT32                      verifierBaseNameLength,
    BYTE*                       verifierBaseName,
    UINT32                      verifierNonceLength,
    BYTE*                       verifierNonce,
    TSS_DAA_SIGN_DATA           signData,
    TSS_DAA_SIGNATURE*          daaSignature
);

DESCRIPTION¶

Tspi_TPM_DAA_Sign creates a DAA Signature that proofs ownership of the DAA Credential and includes a signature on either a public AIK or a message. If anonymity revocation is enabled, the value Nv is not provided in the clear anymore but encrypted under the public key of anonymity revocation authority, a trusted third party (TTP). Thus the DAA Verifier cannot check for revocation or link a transaction/signature to prior ones. Depending on how is chosen, the protocol either allows implementing anonymity revocation (i.e., using the DAA Issuer's long-term base name as the DAA Verifier's base name ), or having the TTP doing the linking of different signatures for the same DAA Verifier (i.e., using the DAA Verifier's base name ).

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.

hDaaCredential¶

The hDaaCredential parameter is the Handle of the DAA Credential.

revealAttributes¶

The revealAttributes parameter is the attributes which the credential owner wants to reveal to the DAA Verifier.

verifierBaseNameLength¶

The verifierBaseNameLength parameter is the Length of verifierBaseName.

verifierBaseName¶

The verifierBaseName parameter is the base name chosen by the DAA Verifier. If it equals to null, the platform chooses a random base name.

verifierNonceLength¶

The verifierNonceLength parameter is the length of verifierNonceName (20 bytes).

verifierNonce¶

The verifierNonce parameter is the nonce created by the DAA Verifier.

signData¶

The signData parameter is the handle of the received DAA Credential.

daaSignature¶

The daaSignature parameter is the DAA signature containing the proof of ownership of the DAA Credential, as well as a signature on either an AIK or a message.

RETURN CODES¶

Tspi_TPM_DAA_Sign returns TSS_SUCCESS on success, otherwise one of the following values is returned:

TSS_E_INVALID_HANDLE

Either the DAA or the TPM handler is not valid.

TSS_E_BAD_PARAMETER

TSS_E_INTERNAL_ERROR

An internal SW error has been detected.

 

CONFORMING TO¶

Tspi_TPM_DAA_Sign conforms to the Trusted Computing Group Software Specification version 1.2

SEE ALSO¶