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[test] ectest: check custom generators

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Reviewed-by: Nicola Tuveri <nic.tuv@gmail.com>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/12096)
This commit is contained in:
Billy Brumley 2020-06-09 13:16:15 +03:00 committed by Dmitry Belyavskiy
parent 661595ca09
commit a01cae99ac
1 changed files with 84 additions and 0 deletions

84
test/ectest.c

@ -2337,6 +2337,89 @@ static int ec_point_hex2point_test(int id)
return ret;
}
/*
* check the EC_METHOD respects the supplied EC_GROUP_set_generator G
*/
static int custom_generator_test(int id)
{
int ret = 0, nid, bsize;
EC_GROUP *group = NULL;
EC_POINT *G2 = NULL, *Q1 = NULL, *Q2 = NULL;
BN_CTX *ctx = NULL;
BIGNUM *k = NULL;
unsigned char *b1 = NULL, *b2 = NULL;
/* Do some setup */
nid = curves[id].nid;
TEST_note("Curve %s", OBJ_nid2sn(nid));
if (!TEST_ptr(ctx = BN_CTX_new()))
return 0;
BN_CTX_start(ctx);
if (!TEST_ptr(group = EC_GROUP_new_by_curve_name(nid)))
goto err;
/* expected byte length of encoded points */
bsize = (EC_GROUP_get_field_type(group) == NID_X9_62_prime_field) ?
BN_num_bytes(EC_GROUP_get0_field(group)) :
(EC_GROUP_get_degree(group) + 7) / 8;
bsize = 2 * bsize + 1;
if (!TEST_ptr(k = BN_CTX_get(ctx))
/* fetch a testing scalar k != 0,1 */
|| !TEST_true(BN_rand(k, EC_GROUP_order_bits(group) - 1,
BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY))
/* make k even */
|| !TEST_true(BN_clear_bit(k, 0))
|| !TEST_ptr(G2 = EC_POINT_new(group))
|| !TEST_ptr(Q1 = EC_POINT_new(group))
/* Q1 := kG */
|| !TEST_true(EC_POINT_mul(group, Q1, k, NULL, NULL, ctx))
/* pull out the bytes of that */
|| !TEST_int_eq(EC_POINT_point2oct(group, Q1,
POINT_CONVERSION_UNCOMPRESSED, NULL,
0, ctx), bsize)
|| !TEST_ptr(b1 = OPENSSL_malloc(bsize))
|| !TEST_int_eq(EC_POINT_point2oct(group, Q1,
POINT_CONVERSION_UNCOMPRESSED, b1,
bsize, ctx), bsize)
/* new generator is G2 := 2G */
|| !TEST_true(EC_POINT_dbl(group, G2, EC_GROUP_get0_generator(group),
ctx))
|| !TEST_true(EC_GROUP_set_generator(group, G2,
EC_GROUP_get0_order(group),
EC_GROUP_get0_cofactor(group)))
|| !TEST_ptr(Q2 = EC_POINT_new(group))
|| !TEST_true(BN_rshift1(k, k))
/* Q2 := k/2 G2 */
|| !TEST_true(EC_POINT_mul(group, Q2, k, NULL, NULL, ctx))
|| !TEST_int_eq(EC_POINT_point2oct(group, Q2,
POINT_CONVERSION_UNCOMPRESSED, NULL,
0, ctx), bsize)
|| !TEST_ptr(b2 = OPENSSL_malloc(bsize))
|| !TEST_int_eq(EC_POINT_point2oct(group, Q2,
POINT_CONVERSION_UNCOMPRESSED, b2,
bsize, ctx), bsize)
/* Q1 = kG = k/2 G2 = Q2 should hold */
|| !TEST_int_eq(CRYPTO_memcmp(b1, b2, bsize), 0))
goto err;
ret = 1;
err:
BN_CTX_end(ctx);
EC_POINT_free(Q1);
EC_POINT_free(Q2);
EC_POINT_free(G2);
EC_GROUP_free(group);
BN_CTX_free(ctx);
OPENSSL_free(b1);
OPENSSL_free(b2);
return ret;
}
#endif /* OPENSSL_NO_EC */
int setup_tests(void)
@ -2364,6 +2447,7 @@ int setup_tests(void)
ADD_ALL_TESTS(check_ec_key_field_public_range_test, crv_len);
ADD_ALL_TESTS(check_named_curve_from_ecparameters, crv_len);
ADD_ALL_TESTS(ec_point_hex2point_test, crv_len);
ADD_ALL_TESTS(custom_generator_test, crv_len);
#endif /* OPENSSL_NO_EC */
return 1;
}