Tspi_DAA_IssueInit(3)

💅 Tspi_DAA_IssueInit(3) — the glow-up edition

okay so this is a page from the TCG Software Stack Developer's Reference, and it lives in the Library Functions Manual section. The function is Tspi_DAA_IssueInit(3), and it's the moment where the DAA Issuer kicks off a join operation. bestie, let's get into it 🎀

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✨ NAME ✨

Tspi_DAA_IssueInit — initialize the Issuer for a join operation. that's it, that's the vibe 🌸

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🦋 SYNOPSIS 🦋

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

TSPICALL Tspi_DAA_IssueInit(
    TSS_HDAA                      hDAA,
    TSS_HKEY                      issuerAuthPK,
    TSS_HKEY                      issuerKeyPair,
    TSS_DAA_IDENTITY_PROOF        identityProof,
    UINT32                        capitalUprimeLength,
    BYTE*                         capitalUprime,
    UINT32                        daaCounter,
    UINT32*                       nonceIssuerLength,
    BYTE**                        nonceIssuer,
    UINT32*                       authenticationChallengeLength,
    BYTE**                        authenticationChallenge,
    TSS_DAA_JOIN_ISSUER_SESSION*  joinSession
);

look at all those parameters. she's got range 💅✨

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💖 DESCRIPTION 💖

Tspi_DAA_IssueInit is a function that's part of the DAA Issuer component. it's literally the first function out of 2 in order to issue a DAA Credential for a TCG Platform. main character energy, honestly 👑

so here's the tea: this function assumes that the endorsement key and its associated credentials are from a genuine and valid TPM. and like — verifying those credentials? that's a whole separate process defined by the TCG Infrastructure WG. not our problem today, not our department 🫶

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🎀 PARAMETERS 🎀

hDAA

this one specifies the handle of the DAA object. iconic little handle, does exactly what it says 🦋

issuerAuthPK

the root authentication (public) key of the DAA Issuer. (ngl the original text calls this one issuerAuthPKh in the prose — tiny typo energy, but the parameter itself is issuerAuthPK and we're keeping it 100% exact 💀)

issuerKeyPair

the handle of the main DAA Issuer key pair — private and public portion. both halves, no crumbs 🙈

identityProof

the structure containing the endorsement, platform and conformance credential of the TPM that's requesting the DAA Credential. it's giving "show me your papers" but make it cryptographic 📜✨

capitalUprimeLength

the length of capitalUprime, which is . — yes bestie, the original literally trails off there. we don't make the rules, we just transcribe them 😭

capitalUprime

U'. that's the whole description. U prime. slay, I guess 💅

daaCounter

the DAA counter. counting things, as counters do 🔢

nonceIssuerLength

the length of nonceIssuer (20 bytes). twenty. two-zero. noted 📏

nonceIssuer

the nonce of the DAA Issuer. fresh, random, one-time — the nonce of the season 🌸

authenticationChallengeLength

the length of authenticationChallenge (256 bytes - DAA_SIZE_NE1). yes, the constant is right there, use it 🧚

authenticationChallenge

the second nonce of the DAA Issuer, and it's encrypted by the endorsement public key. it's used as a challenge to authenticate the TPM. spicy little challenge, love that for us 🔥

joinSession

the structure containing the DAA Join session information. the whole session, the whole vibe 🎀

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💀 RETURN CODES 💀

Tspi_DAA_IssueInit returns TSS_SUCCESS on success. otherwise, one of these baddies comes back at you:

• TSS_E_INVALID_HANDLE — either the DAA is not valid. (the original says "Either the DAA is not valid." — dangling "either," but we respect the source 🙈)
• TSS_E_BAD_PARAMETER — listed with no extra explanation in the original, so no extra explanation from me either. mysterious. I respect it.
• TSS_E_INTERNAL_ERROR — an internal SW error has been detected. software said "not today" 😭

lowkey if you get anything other than TSS_SUCCESS, go check your handles and your parameters before you spiral. the source lists exactly these three, so that's exactly what you get.

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🌈 CONFORMING TO 🌈

Tspi_DAA_IssueInit conforms to the Trusted Computing Group Software Specification version 1.2. certified compliant, no cap 👑

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👀 SEE ALSO 👀

• Tspi_DAA_IssuerKeyVerification(3)

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okay that's the whole page, every parameter, every return code, every byte count — nothing skipped, nothing invented 💜

and as a little sign-off: this gem is from TSS 1.2, dated 2006-09-04, and it's page Tspi_DAA_IssueInit(3) in the Library Functions Manual. vintage but still serving 🍓✨