1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (c) 2021 Huawei Technologies Co., Ltd
*/
#include <compiler.h>
#include <crypto/crypto.h>
#include <mbedtls/bignum.h>
#include <stddef.h>
#include <tee_api_defines.h>
#include <tee_api_types.h>
#include "mbed_helpers.h"
/* Generate random number 1 <= n < max */
TEE_Result mbed_gen_random_upto(mbedtls_mpi *n, mbedtls_mpi *max)
{
size_t sz = mbedtls_mpi_size(max);
bool found = false;
int mres = 0;
do {
mres = mbedtls_mpi_fill_random(n, sz, mbd_rand, NULL);
if (mres)
return TEE_ERROR_BAD_STATE;
if (mbedtls_mpi_bitlen(n) != 0 &&
mbedtls_mpi_cmp_mpi(n, max) == -1)
found = true;
} while (!found);
return TEE_SUCCESS;
}
|
