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New function mbedtls_ecp_keypair_get_group_id

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Add a simple function to get the group id from a key object.

This information is available via mbedtls_ecp_export, but that function
consumes a lot of memory, which is a waste if all you need is to identify
the curve.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2023-06-21 18:22:06 +02:00
parent 69b290589b
commit e6886102ef
3 changed files with 24 additions and 0 deletions
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6
tests/suites/test_suite_ecp.function
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@ -1030,6 +1030,7 @@ void mbedtls_ecp_gen_key(int id)
&mbedtls_test_rnd_pseudo_rand,
&rnd_info) == 0);
TEST_EQUAL(mbedtls_ecp_keypair_get_group_id(&key), id);
TEST_ASSERT(mbedtls_ecp_check_pubkey(&key.grp, &key.Q) == 0);
TEST_ASSERT(mbedtls_ecp_check_privkey(&key.grp, &key.d) == 0);
@ -1052,6 +1053,7 @@ void mbedtls_ecp_read_key(int grp_id, data_t *in_key, int expected, int canonica
TEST_ASSERT(ret == expected);
if (expected == 0) {
TEST_EQUAL(mbedtls_ecp_keypair_get_group_id(&key), grp_id);
ret = mbedtls_ecp_check_privkey(&key.grp, &key.d);
TEST_ASSERT(ret == 0);
@ -1233,6 +1235,10 @@ void ecp_export(int id, char *Qx, char *Qy, char *d, int expected_ret, int inval
TEST_EQUAL(mbedtls_ecp_point_cmp(&key.Q, &export_Q), 0);
TEST_EQUAL(mbedtls_mpi_cmp_mpi(&key.d, &export_d), 0);
TEST_EQUAL(mbedtls_ecp_group_cmp(&key.grp, &export_grp), 0);
/* Check consistency with the group id */
TEST_EQUAL(export_grp.id,
mbedtls_ecp_keypair_get_group_id(&key));
}
exit: