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test(esp_hal_security): warm up ECC const-time loop before measuring

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harshal.patil
2026-06-09 15:07:55 +05:30
parent 6b8f830991
commit b420f20040
1 changed files with 10 additions and 0 deletions
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components/esp_hal_security/test_apps/crypto/main/ecc/test_ecc.c
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@@ -207,6 +207,10 @@ static void test_ecc_point_mul_inner_constant_time(void)
uint32_t max_time = 0, min_time = UINT32_MAX;
int loop_count = 10;
/* Warm-up: the first call is otherwise an I-cache / branch-predictor
* outlier that dominates max_time and thus creating deviations */
ecc_point_mul(scalar_le, x_le, y_le, ECC_P256_SIZE_BYTES, 0, x_res_le, y_res_le);
for (int i = 0; i < loop_count; i++) {
ccomp_timer_start();
ecc_point_mul(scalar_le, x_le, y_le, ECC_P256_SIZE_BYTES, 0, x_res_le, y_res_le);
@@ -230,6 +234,9 @@ static void test_ecc_point_mul_inner_constant_time(void)
min_time = UINT32_MAX;
total_elapsed_time = 0;
/* Warm-up — see comment on the P256 loop. */
ecc_point_mul(scalar_le, x_le, y_le, ECC_P192_SIZE_BYTES, 0, x_res_le, y_res_le);
for (int i = 0; i < loop_count; i++) {
ccomp_timer_start();
ecc_point_mul(scalar_le, x_le, y_le, ECC_P192_SIZE_BYTES, 0, x_res_le, y_res_le);
@@ -255,6 +262,9 @@ static void test_ecc_point_mul_inner_constant_time(void)
min_time = UINT32_MAX;
total_elapsed_time = 0;
/* Warm-up — see comment on the P256 loop. */
ecc_point_mul(scalar_le, x_le, y_le, ECC_P384_SIZE_BYTES, 0, x_res_le, y_res_le);
for (int i = 0; i < loop_count; i++) {
ccomp_timer_start();
ecc_point_mul(scalar_le, x_le, y_le, ECC_P384_SIZE_BYTES, 0, x_res_le, y_res_le);