pub unsafe extern "C" fn RSA_meth_set_bn_mod_exp( rsa: *mut rsa_meth_st, bn_mod_exp: Option<unsafe extern "C" fn(*mut bignum_st, *const bignum_st, *const bignum_st, *const bignum_st, *mut bignum_ctx, *mut bn_mont_ctx_st) -> i32>, ) -> i32