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Add tests for the cmov implementations
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@elichai
elichai committed Jun 3, 2020
1 parent 73596a8 commit 2860950
Showing 1 changed file with 158 additions and 1 deletion.
159 changes: 158 additions & 1 deletion src/tests.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3118,7 +3118,7 @@ void test_ecmult_multi_batching(void) {
data.pt = pt;
secp256k1_gej_neg(&r2, &r2);

/* Test with empty scratch space. It should compute the correct result using
/* Test with empty scratch space. It should compute the correct result using
* ecmult_mult_simple algorithm which doesn't require a scratch space. */
scratch = secp256k1_scratch_create(&ctx->error_callback, 0);
CHECK(secp256k1_ecmult_multi_var(&ctx->error_callback, &ctx->ecmult_ctx, scratch, &r, &scG, ecmult_multi_callback, &data, n_points));
Expand Down Expand Up @@ -5292,6 +5292,161 @@ void run_memczero_test(void) {
CHECK(memcmp(buf1, buf2, sizeof(buf1)) == 0);
}

void int_cmov_test(void) {
int r = INT_MAX;
int a = 0;

secp256k1_int_cmov(&r, &a, 0);
CHECK(r == INT_MAX);

r = 0; a = INT_MAX;
secp256k1_int_cmov(&r, &a, 1);
CHECK(r == INT_MAX);

a = 0;
secp256k1_int_cmov(&r, &a, 1);
CHECK(r == 0);

a = 1;
secp256k1_int_cmov(&r, &a, 1);
CHECK(r == 1);

r = 1; a = 0;
secp256k1_int_cmov(&r, &a, 0);
CHECK(r == 1);

}

void fe_cmov_test(void) {
static const secp256k1_fe zero = SECP256K1_FE_CONST(0, 0, 0, 0, 0, 0, 0, 0);
static const secp256k1_fe one = SECP256K1_FE_CONST(0, 0, 0, 0, 0, 0, 0, 1);
static const secp256k1_fe max = SECP256K1_FE_CONST(
0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL,
0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL
);
secp256k1_fe r = max;
secp256k1_fe a = zero;

secp256k1_fe_cmov(&r, &a, 0);
CHECK(memcmp(&r, &max, sizeof(r)) == 0);

r = zero; a = max;
secp256k1_fe_cmov(&r, &a, 1);
CHECK(memcmp(&r, &max, sizeof(r)) == 0);

a = zero;
secp256k1_fe_cmov(&r, &a, 1);
CHECK(memcmp(&r, &zero, sizeof(r)) == 0);

a = one;
secp256k1_fe_cmov(&r, &a, 1);
CHECK(memcmp(&r, &one, sizeof(r)) == 0);

r = one; a = zero;
secp256k1_fe_cmov(&r, &a, 0);
CHECK(memcmp(&r, &one, sizeof(r)) == 0);
}

void fe_storage_cmov_test(void) {
static const secp256k1_fe_storage zero = SECP256K1_FE_STORAGE_CONST(0, 0, 0, 0, 0, 0, 0, 0);
static const secp256k1_fe_storage one = SECP256K1_FE_STORAGE_CONST(0, 0, 0, 0, 0, 0, 0, 1);
static const secp256k1_fe_storage max = SECP256K1_FE_STORAGE_CONST(
0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL,
0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL
);
secp256k1_fe_storage r = max;
secp256k1_fe_storage a = zero;

secp256k1_fe_storage_cmov(&r, &a, 0);
CHECK(memcmp(&r, &max, sizeof(r)) == 0);

r = zero; a = max;
secp256k1_fe_storage_cmov(&r, &a, 1);
CHECK(memcmp(&r, &max, sizeof(r)) == 0);

a = zero;
secp256k1_fe_storage_cmov(&r, &a, 1);
CHECK(memcmp(&r, &zero, sizeof(r)) == 0);

a = one;
secp256k1_fe_storage_cmov(&r, &a, 1);
CHECK(memcmp(&r, &one, sizeof(r)) == 0);

r = one; a = zero;
secp256k1_fe_storage_cmov(&r, &a, 0);
CHECK(memcmp(&r, &one, sizeof(r)) == 0);
}

void scalar_cmov_test(void) {
static const secp256k1_scalar zero = SECP256K1_SCALAR_CONST(0, 0, 0, 0, 0, 0, 0, 0);
static const secp256k1_scalar one = SECP256K1_SCALAR_CONST(0, 0, 0, 0, 0, 0, 0, 1);
static const secp256k1_scalar max = SECP256K1_SCALAR_CONST(
0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL,
0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL
);
secp256k1_scalar r = max;
secp256k1_scalar a = zero;

secp256k1_scalar_cmov(&r, &a, 0);
CHECK(memcmp(&r, &max, sizeof(r)) == 0);

r = zero; a = max;
secp256k1_scalar_cmov(&r, &a, 1);
CHECK(memcmp(&r, &max, sizeof(r)) == 0);

a = zero;
secp256k1_scalar_cmov(&r, &a, 1);
CHECK(memcmp(&r, &zero, sizeof(r)) == 0);

a = one;
secp256k1_scalar_cmov(&r, &a, 1);
CHECK(memcmp(&r, &one, sizeof(r)) == 0);

r = one; a = zero;
secp256k1_scalar_cmov(&r, &a, 0);
CHECK(memcmp(&r, &one, sizeof(r)) == 0);
}

void ge_storage_cmov_test(void) {
static const secp256k1_ge_storage zero = SECP256K1_GE_STORAGE_CONST(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
static const secp256k1_ge_storage one = SECP256K1_GE_STORAGE_CONST(0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1);
static const secp256k1_ge_storage max = SECP256K1_GE_STORAGE_CONST(
0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL,
0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL,
0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL,
0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL
);
secp256k1_ge_storage r = max;
secp256k1_ge_storage a = zero;

secp256k1_ge_storage_cmov(&r, &a, 0);
CHECK(memcmp(&r, &max, sizeof(r)) == 0);

r = zero; a = max;
secp256k1_ge_storage_cmov(&r, &a, 1);
CHECK(memcmp(&r, &max, sizeof(r)) == 0);

a = zero;
secp256k1_ge_storage_cmov(&r, &a, 1);
CHECK(memcmp(&r, &zero, sizeof(r)) == 0);

a = one;
secp256k1_ge_storage_cmov(&r, &a, 1);
CHECK(memcmp(&r, &one, sizeof(r)) == 0);

r = one; a = zero;
secp256k1_ge_storage_cmov(&r, &a, 0);
CHECK(memcmp(&r, &one, sizeof(r)) == 0);
}

void run_cmov_tests(void) {
int_cmov_test();
fe_cmov_test();
fe_storage_cmov_test();
scalar_cmov_test();
ge_storage_cmov_test();
}

int main(int argc, char **argv) {
unsigned char seed16[16] = {0};
unsigned char run32[32] = {0};
Expand Down Expand Up @@ -5431,6 +5586,8 @@ int main(int argc, char **argv) {
/* util tests */
run_memczero_test();

run_cmov_tests();

secp256k1_rand256(run32);
printf("random run = %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n", run32[0], run32[1], run32[2], run32[3], run32[4], run32[5], run32[6], run32[7], run32[8], run32[9], run32[10], run32[11], run32[12], run32[13], run32[14], run32[15]);

Expand Down

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