Bignum: Deprecate mbedtls_mpi_is_prime()
When using a primality testing function the tolerable error rate depends
on the scheme in question, the required security strength and wether it
is used for key generation or parameter validation. To support all use
cases we need more flexibility than what the old API provides.
diff --git a/library/rsa_internal.c b/library/rsa_internal.c
index 507009f..9a42d47 100644
--- a/library/rsa_internal.c
+++ b/library/rsa_internal.c
@@ -351,15 +351,20 @@
*/
#if defined(MBEDTLS_GENPRIME)
+ /*
+ * When generating keys, the strongest security we support aims for an error
+ * rate of at most 2^-100 and we are aiming for the same certainty here as
+ * well.
+ */
if( f_rng != NULL && P != NULL &&
- ( ret = mbedtls_mpi_is_prime( P, f_rng, p_rng ) ) != 0 )
+ ( ret = mbedtls_mpi_is_prime_ext( P, 50, f_rng, p_rng ) ) != 0 )
{
ret = MBEDTLS_ERR_RSA_KEY_CHECK_FAILED;
goto cleanup;
}
if( f_rng != NULL && Q != NULL &&
- ( ret = mbedtls_mpi_is_prime( Q, f_rng, p_rng ) ) != 0 )
+ ( ret = mbedtls_mpi_is_prime_ext( Q, 50, f_rng, p_rng ) ) != 0 )
{
ret = MBEDTLS_ERR_RSA_KEY_CHECK_FAILED;
goto cleanup;