pub unsafe extern "C" fn RSA_meth_get_bn_mod_exp( meth: *const rsa_meth_st, ) -> 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>