.\" Copyright (C) 2006 International Business Machines Corporation
.\" Written by Anthony Bussani based on the Trusted Computing Group Software Stack Specification Version 1.2
.\"
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.TH "Tspi_TPM_DAA_Sign" 3 "2006-09-04" "TSS 1.2"
.ce 1
TCG Software Stack Developer's Reference
.SH NAME
Tspi_TPM_DAA_Sign \- creates a DAA Signature that proofs ownership of the DAA Credential
.SH "SYNOPSIS"
.ad l
.hy 0
.nf
.B #include <tss/tss_typedef.h>
.B #include <tss/tss_structs.h>
.B #include <tss/tspi.h>
.sp
.BI "TSS_RESULT Tspi_TPM_DAA_Sign("
.BI "    TSS_HDAA                    " hDAA ","
.BI "    TSS_HTPM                    " hTPM ","
.BI "    TSS_HKEY                    " hDaaCredential ","
.BI "    TSS_DAA_SELECTED_ATTRIB     " revealAttributes ","
.BI "    UINT32                      " verifierBaseNameLength ","
.BI "    BYTE*                       " verifierBaseName ","
.BI "    UINT32                      " verifierNonceLength ","
.BI "    BYTE*                       " verifierNonce ","
.BI "    TSS_DAA_SIGN_DATA           " signData ","
.BI "    TSS_DAA_SIGNATURE*          " daaSignature
.BI ");"
.fi
.sp
.ad
.hy

.SH "DESCRIPTION"
.PP
\Tspi_TPM_DAA_Sign\fR
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 ).
.SH "PARAMETERS"
.PP
.SS hDAA
The \fIhDAA\fR parameter is used to specify the handle of the DAA object.
.SS hTPM
The \fIhTPM\fR parameter is the handle to the TPM object.
.SS hDaaCredential
The \fIhDaaCredential\fR parameter is the Handle of the DAA Credential.
.SS revealAttributes
The \fIrevealAttributes\fR parameter is the attributes which the credential owner wants to reveal
to the DAA Verifier.
.SS verifierBaseNameLength
The \fIverifierBaseNameLength\fR parameter is the Length of verifierBaseName.
.SS verifierBaseName
The \fIverifierBaseName\fR parameter is the base name chosen by the DAA Verifier. If it equals to null,
the platform chooses a random base name.
.SS verifierNonceLength
The \fIverifierNonceLength\fR parameter is the length of verifierNonceName (20 bytes).
.SS verifierNonce
The \fIverifierNonce\fR parameter is the nonce created by the DAA Verifier.
.SS signData
The \fIsignData\fR parameter is the handle of the received DAA Credential.
.SS daaSignature
The \fIdaaSignature\fR 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.

.SH "RETURN CODES"
.PP
\fBTspi_TPM_DAA_Sign\fR returns TSS_SUCCESS on success, otherwise one of the
following values is returned:
.TP
.SM TSS_E_INVALID_HANDLE
Either the DAA or the TPM handler is not valid.
.TP
.SM TSS_E_BAD_PARAMETER
.TP
.SM TSS_E_INTERNAL_ERROR
An internal SW error has been detected.

.SH "CONFORMING TO"
.PP
\fBTspi_TPM_DAA_Sign\fR conforms to the Trusted Computing Group
Software Specification version 1.2

.SH "SEE ALSO"

.PP