TSPI_DAA_VERIFYSIGNATURE(3)

NAME 🌸

okay so bestie, welcome to Tspi_DAA_VerifySignature(3) — this is the Library Functions Manual entry from the TCG Software Stack Developer's Reference 💖. The NAME line literally says Tspi_DAA_VerifySignature — creates a challenge for the TCG platform. Yes, that's the actual wording, keep it in your notes 📝✨.

SYNOPSIS ✨

Here's the exact include-and-signature sitch, no cap:

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

       TSPICALL Tspi_DAA_VerifySignature(
           TSS_HDAA                    hDAA,
           TSS_DAA_SIGNATURE           daaSignature,
           TSS_HKEY                    hPubKeyIssuer,
           TSS_DAA_SIGN_DATA           signData,
           UINT32                      attributesLength,
           BYTE**                      attributes,
           UINT32                      nonceVerifierLength,
           BYTE*                       nonceVerifier,
           UINT32                      baseNameLength,
           BYTE*                       baseName,
           TSS_BOOL*                   isCorrect
       );

DESCRIPTION 💖

Tspi_DAA_VerifySignature is part of the DAA Verifier component. It's the last function out of 2 in order to verify a DAA Credential of a TCG platform. It verifies the DAA Credential and detects public rogue TPMs. This is an optional function and does not require a TPM or a TCS. So it's the finisher, the closing act, the last out of 2 — and it's out here doing credential verification and rogue-TPM detection like the main character it is 🔥👑

PARAMETERS 💅

Let's run the parameter vibe check one by one, bestie 🫶:

hDAA — specifies the handle of the DAA object.
daaSignature — the DAA signature. It contains proof of ownership of the DAA Credential, as well as a signature on either an AIK or a message.
hPubKeyIssuer — the handle of the DAA public key of the DAA Issuer of the credential.
signData — defines what data is signed (AIK or message).
attributesLength — the Length of attributes array that is determined by the DAA Issuer public key (lh+li). The length of a single attribute is lf/8.
attributes — the array of attributes which the DAA Credential owner reveals.
nonceVerifierLength — the length of nonceVerifier (20 bytes).
nonceVerifier — the nonce that was computed in the previous function (Tspi_VerifyInit).
baseNameLength — the length of the baseName.
baseName — the base name that was chosen for the DAA Signature.
isCorrect — denotes if the verification of the DAA Signature was successful.

RETURN CODES 🚨

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

TSS_E_BAD_PARAMETER
TSS_E_INTERNAL_ERROR — An internal SW error has been detected.

CONFORMING TO 🌈

Tspi_DAA_VerifySignature conforms to the Trusted Computing Group Software Specification version 1.2. Periodt 💅✨