int _goboringcrypto_RSA_decrypt(GO_RSA*, size_t *out_len, uint8_t *out, size_t max_out, const uint8_t *in, size_t in_len, int padding);
int _goboringcrypto_RSA_sign(int hash_nid, const uint8_t* in, unsigned int in_len, uint8_t *out, unsigned int *out_len, GO_RSA*);

	}
	nid := C._goboringcrypto_EVP_MD_type(md)
	var out []byte
	var outLen C.uint
	if priv.withKey(func(key *C.GO_RSA) C.int {
		out = make([]byte, C._goboringcrypto_RSA_size(key))
		return C._goboringcrypto_RSA_sign(nid, base(hashed), C.uint(len(hashed)),
			base(out), &outLen, key)
	}) == 0 {
		return nil, fail("RSA_sign")
	}
	return out[:outLen], nil
}