revealShareByFile

Reveals the shares to obtain the final calculation result.

int revealShareByFile(
    DG_TeeCtx *dgTeeCtx, 
    const DG_MpcFileInput *input, 
    DG_MpcFileOutput *output
)

Parameters

Parameter	Description	Value Range	Input/Output
dgTeeCtx	KCAL context	Context initialized in section initTeeCtx.	Input
input	DG_MpcFileInput	The value is not null.	Input
output	DG_MpcFileOutput	The value is not null.	Output

**Table 1** DG_MpcFileInputSet structure
Name	Type	Description
shareInputSet	DG_MpcFileInput	File shares of each participant
size	unsigned long	Number of participants

**Table 2** DG_MpcFileInput structure
Name	Type	Description
filePath	char*	File path
pathLen	uint32_t	Path length
dataSize	uint64_t	Data size

**Table 3** DG_MpcFileOutput structure
Name	Type	Description
filePath	char*	File path
pathLen	uint32_t	Path length
dataSize	uint64_t	Data size

Return Values

Success: 0 is returned.
Failure: The error code is returned.

Error Codes

Error Code	Value	Description	Remarks
DG_ERR_MPC_TEE_INVALID_PARAM 4516	4501 DG_ERR_MPC_TEE_TMP_PATH_SET_ERROR	Invalid parameter Incorrect temporary directory settings	-
DG_ERR_MPC_TEE_INVALID_ALGORITHM_TYPE 4514	4502 DG_ERR_MPC_TEE_CHUNK_SIZE_SET_ERROR	Invalid algorithm type Incorrect file chunk size	-

Error Code

Value

Description

Remarks

DG_ERR_MPC_TEE_INVALID_PARAM

4516

4501

DG_ERR_MPC_TEE_TMP_PATH_SET_ERROR

Invalid parameter

Incorrect temporary directory settings

DG_ERR_MPC_TEE_INVALID_ALGORITHM_TYPE

4514

4502

DG_ERR_MPC_TEE_CHUNK_SIZE_SET_ERROR

Invalid algorithm type

Incorrect file chunk size

Dependency

dgTeeCtx depends on the successful initialization of initTeeCtx.
The dependent header file is data_guard_mpc.h.

Example

Obtain the output result based on the path in output.

#include  "data_guard_mpc.h" 
 // Compute party
DG_MpcFileInput teeFileInput;
teeFileInput.filePath = const_cast<char *>(shareFilePath.c_str());
teeFileInput.pathLen = static_cast<uint32_t>(shareFilePath.length());

DG_MpcFileOutput teeFileOutput;
teeFileOutput.filePath = const_cast<char *>(outputFilePath.c_str());
teeFileOutput.pathLen = static_cast<uint32_t>(outputFilePath.length());
int ret = opts_->revealShareByFile(dgTeeCtx_, &teeFileInput, &teeFileOutput);

Parent topic: Arithmetic Operators