topic sgx_ecc256_create_key_pair fail in Intel® Software Guard Extensions (Intel® SGX)

sgx_ecc256_create_key_pair fail

AArya2 — Thu, 02 Feb 2017 21:59:11 GMT

Hi,

I've written a very simple test to learn working with elliptic curve cryptography inside an enclave. But the key creation method fails with SGX_ERROR_UNEXPECTED.

Here is my enclave:

#include "Enc_t.h"

#include "sgx_trts.h"
#include "sgx_tcrypto.h"

int Test(sgx_status_t *error)
{
	sgx_ecc_state_handle_t handle;
	sgx_ec256_private_t sk;
	sgx_ec256_public_t pk;
	sgx_status_t status;

	status = sgx_ecc256_open_context(&handle);
	if (status)
	{
		*error = status;
		return 1;
	}
	
	status = sgx_ecc256_create_key_pair(&sk, &pk, &handle);
	if (status)
	{
		*error = status;
		return 2;
	}

	*error = SGX_SUCCESS;
	return 0;

}

and this is my host app:

#include "Enc_u.h"
#include "sgx_urts.h"
#include <cstdio>
#include <tchar.h>

#define ENC _T("../Debug/Enc.signed.dll")

int main()
{
	sgx_status_t error;
	sgx_enclave_id_t eid;
	sgx_launch_token_t token;
	int updated = 0;
	int step;

	error = sgx_create_enclave(ENC, SGX_DEBUG_FLAG, &token, &updated, &eid, nullptr);

	if (error)
		printf("Failed to create enclave\n");

	Test(eid, &step, &error);

	if (error)
		printf("Failed on step %d\n", step);

	return 0;
}

The result is error = 1 on step = 2.

Any ideas what I'm doing wrong or what I might have configured incorrectly? I'm using Visual Studio Community 2015 and Intel C++ Compiler 17.0.

Hi, -Surenthar

Surenthar_S_Intel — Fri, 03 Feb 2017 07:06:00 GMT

Hi,

use the below statement instead of this "status = sgx_ecc256_create_key_pair(&sk, &pk, &handle);"

status = sgx_ecc256_create_key_pair(&sk, &pk, handle);

-Surenthar

It worked. Thank you!

AArya2 — Fri, 03 Feb 2017 14:56:51 GMT

It worked. Thank you!

hi Arya P,

larguet__ramzi — Thu, 09 May 2019 09:18:35 GMT

hi Arya P,

I am very happy that it worked for you.

Could you please, Arya P, share the EDL file of the Test() function, because I have a problem in thedeclaration of this function in my EDL file.

Thank you

hi,

larguet__ramzi — Thu, 09 May 2019 12:10:50 GMT

hi,

How could I get the public key created by the function sgx_ecc256_create_key_pair out of the enclave?