.\" Copyright (C) 2004 International Business Machines Corporation
.\" Written by Megan Schneider based on the Trusted Computing Group Software Stack Specification Version 1.1 Golden
.\"
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.TH "Tspi_Data_Unbind" 3 "2004-05-25" "TSS 1.1"
.ce 1
TCG Software Stack Developer's Reference
.SH NAME
Tspi_Data_Unbind \- Decrypts data that has been bound to a key
.SH "SYNOPSIS"
.ad l
.hy 0
.nf
.B #include <tss/platform.h>
.B #include <tss/tcpa_defines.h>
.B #include <tss/tcpa_typedef.h>
.B #include <tss/tcpa_struct.h>
.B #include <tss/tss_typedef.h>
.B #include <tss/tss_structs.h>
.B #include <tss/tspi.h>
.sp
.BI "TSS_RESULT Tspi_Data_Unbind(TSS_HENCDATA " hEncData ",             TSS_HKEY " hEncKey ","
.BI "                            UINT32*      " pulUnboundDataLength ", BYTE**   " prgbUnboundData ");"
.fi
.sp
.ad
.hy

.SH "DESCRIPTION"
.PP
\fBTspi_Data_Unbind\fR decrypts the encrypted data
blob exportedfrom the data object used in \fBTspi_Data_Bind\fR. The
encrypted data blob must be imported to the object addressed by
\fBTspi_SetAttribData\fR before calling this method.

.SH "PARAMETERS"
.PP
.SS hEncData
The handle of the data object which contains the encrypted data.
.SS hEncKey
Handle to the key object addressing the private key which is used
to decrypt the data.
.SS pulDataLength
Receives the length of the data at the parameter \fIprgbUnboundData\fR.
.SS prgbUnboundData
Receives a pointer to a buffer containing the plaintext data.

.SH "RETURN CODES"
.PP
\fBTspi_Data_Unbind\fR returns TSS_SUCCESS on success, otherwise one
of the following values is returned:
.TP
.SM TSS_E_INVALID_HANDLE
\fIhEncData\fR or \fIhEncKey\fR is not a valid handle.

.TP
.SM TSS_E_INTERNAL_ERROR
An internal SW error has been detected.

.TP
.SM TSS_E_BAD_PARAMETER
One or more parameters is bad.

.TP
.SM TSS_E_INVALID_ENCSCHEME
Invalid encryption scheme.

.TP
.SM TSS_E_ENC_INVALID_LENGTH
Invalid length of data to be encypted.

.TP
.SM TSS_E_ENC_NO_DATA
No data to encrypt.

.TP
.SM TSS_E_ENC_INVALID_TYPE
Invalid encryption type.


.SH "CONFORMING TO"

.PP
\fBTspi_Data_Unbind\fR conforms to the Trusted Computing Group Software
Specification version 1.1 Golden

.SH "SEE ALSO"

.PP
\fBTspi_Data_Bind\fR(3), \fBTspi_Data_Unseal\fR(3),
\fBTspi_Data_Seal\fR(3).