OpenSSL provider question

Hi,I want to develop a RSA provider that uses an external HW chip to do the RSA encryption/decryption. The HW chip supports several RSA keys. 1) How can pass information to the provider which key to use? How about information about which key public or private should be used?2) Asymmetrical algorithm function has the following parameters:encrypt_init(void *ctx, void *key, const OSSL_PARAM params[])But I do not know what openssl core provides by the key pointer3) How to make sure that my RSA provider takes precedence over the built-in one?I would appreciate your helpTom