.\" 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_DAA_VerifySignature" 3 "2006-09-04" "TSS 1.2"
.ce 1
TCG Software Stack Developer's Reference
.SH NAME
Tspi_DAA_VerifySignature \- creates a challenge for the TCG platform
.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 "TSPICALL Tspi_DAA_VerifySignature("
.BI "    TSS_HDAA                    " hDAA ","
.BI "    TSS_DAA_SIGNATURE           " daaSignature ","
.BI "    TSS_HKEY                    " hPubKeyIssuer ","
.BI "    TSS_DAA_SIGN_DATA           " signData ","
.BI "    UINT32                      " attributesLength ","
.BI "    BYTE**                      " attributes ","
.BI "    UINT32                      " nonceVerifierLength ","
.BI "    BYTE*                       " nonceVerifier ","
.BI "    UINT32                      " baseNameLength ","
.BI "    BYTE*                       " baseName ","
.BI "    TSS_BOOL*                   " isCorrect
.BI ");"
.fi
.sp
.ad
.hy

.SH "DESCRIPTION"
.PP
\Tspi_DAA_VerifySignature\fR
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.

.SH "PARAMETERS"
.PP
.SS hDAA
The \fIhDAA\fR parameter is used to specify the handle of the DAA object.
.SS daaSignature
The \fIdaaSignature\fR parameter is the DAA signature contains proof of
ownership of the DAA Credential, as well as a signature on either an AIK or a message.
.SS hPubKeyIssuer
The \fIhPubKeyIssuer\fR parameter is the handle of the DAA public key of the DAA Issuer
of the credential.
.SS signData
The \fIsignData\fR parameter defines what data is signed (AIK or message).
.SS attributesLength
The \fIattributesLength\fR parameter is 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.
.SS attributes
The \fIattributes\fR parameter is the array of attributes which the DAA Credential owner reveals.
.SS nonceVerifierLength
The \fInonceVerifierLength\fR parameter is the length of nonceVerifier (20 bytes).
.SS nonceVerifier
The \fInonceVerifier\fR parameter is the nonce that was computed in the previous function (Tspi_VerifyInit).
.SS baseNameLength
The \fIbaseNameLength\fR parameter the length of the baseName.
.SS baseName
The \fIbaseName\fR parameter is the base name that was chosen for the DAA Signature.
.SS isCorrect
The \fIisCorrect\fR parameter denotes if the verification of the DAA Signature was successful.

.SH "RETURN CODES"
.PP
\fBTspi_DAA_VerifySignature\fR returns TSS_SUCCESS on success, otherwise one of the
following values is returned:
.TP
.SM TSS_E_BAD_PARAMETER
.TP
.SM TSS_E_INTERNAL_ERROR
An internal SW error has been detected.
.TP
.SH "CONFORMING TO"
.PP
\fBTspi_DAA_VerifySignature\fR conforms to the Trusted Computing Group
Software Specification version 1.2

.SH "SEE ALSO"

.PP
\fBTspi_DAA_IssuerKeyVerification\fR(3)