EVP_PKEY_meth_get_encrypt
EVP_PKEY_meth_get_encrypt(dasync_rsa_orig, &pencrypt_init, NULL);
EVP_PKEY_meth_get_encrypt(dasync_rsa_orig, NULL, &pencryptfn);
OSSL_DEPRECATEDIN_3_0 void EVP_PKEY_meth_get_encrypt(const EVP_PKEY_METHOD *pmeth, int (**pencrypt_init)(EVP_PKEY_CTX *ctx),