Pass low level RSA objects to the default provider

Pass low level RSA objects to the default provider

If a low level RSA object has been assigned a custom RSA_METHOD and is
then assigned to an EVP_PKEY object, then we still want the default
provider to use that RSA_METHOD. To ensure this occurs we pass the low
level object across the provider boundary. We can only get away with this
because it is the default provider.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
MergeDate: Fri Feb 13 07:58:21 2026
(Merged from https://github.com/openssl/openssl/pull/29960)