Tspi_Data_Unseal(3)				     TCG Software Stack Developer's Reference				       Tspi_Data_Unseal(3)

NAME

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

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)