Tspi_Data_Unseal(3) TCG Software Stack Developer's Reference

NAME

Tspi_Data_Unseal - dencrypt data encrypted by Tspi_Data_Seal() only
if it was encrypted on the same platform and under the current
configuration.

SYNOPSIS

#include <tss/platform.h>
#include <tss/tcpa_defines.h>
#include <tss/tcpa_typedef.h>
#include <tss/tcpa_struct.h>
#include <tss/tss_typedef.h>
#include <tss/tss_structs.h>
#include <tss/tspi.h>

TSS_RESULT Tspi_Data_Unseal(TSS_HENCDATA hEncData, TSS_HKEY hKey,
UINT32 pulUnsealedDataLength, BYTE** prgbUnsealedData);

DESCRIPTION

Tspi_Data_Unseal reveals data encrypted by the Tspi_Data_Seal only if
it was encrypted on the same platform and the current configuration.
This is internally proofed and guaranteed by the TPM.

PARAMETERS

hEncData
Handle of the data object which contains the sealed data.

hKey
Handle to the key object addressing the nonmigratable key which is
used to decrypt the data.

pulUnsealedDataLength
The length (in bytes) of the prgbUnsealedData parameter.

prgbUnsealedData
On successful completion of the command, this parameter points to a
buffer containing the plaintext data.

hPcrComposite
Handle of the PCR Composite object specifying the PCRs which are part
of the sealed data blob. Set to NULL, if the encrypted data should
only be bound to the system and PCRs are not of interest.

RETURN CODES

Tspi_Data_Unseal returns TSS_SUCCESS on success, otherwise one of the
following values are returned:

TSS_E_INVALID_HANDLE - Either hEncData or hKey is not a valid handle.

TSS_E_INTERNAL_ERROR - An error occurred internal to the TSS.

CONFORMING TO

Tspi_Data_Unseal conforms to the Trusted Computing Group Software
Specification version 1.1 Golden

SEE ALSO

Tspi_Data_Seal(3).


TSS 1.1 2004-05-26 Tspi_Data_Unseal(3)