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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UTIL_CRYPTO_CERTIFICATE_UTILS_H_
#define UTIL_CRYPTO_CERTIFICATE_UTILS_H_
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <stdint.h>
#include <chrono>
#include <string>
#include <vector>
#include "absl/strings/string_view.h"
#include "platform/api/time.h"
#include "platform/base/error.h"
#include "util/crypto/rsa_private_key.h"
namespace openscreen {
// Generates a new RSA key pair with bit width |key_bits|.
bssl::UniquePtr<EVP_PKEY> GenerateRsaKeyPair(int key_bits = 2048);
// Creates a new X509 certificate having the given |name| and |duration| until
// expiration, and based on the given |key_pair|. If |issuer| and |issuer_key|
// are provided, they are used to set the issuer information, otherwise it will
// be self-signed. |make_ca| determines whether additional extensions are added
// to make it a valid certificate authority cert.
ErrorOr<bssl::UniquePtr<X509>> CreateSelfSignedX509Certificate(
absl::string_view name,
std::chrono::seconds duration,
const EVP_PKEY& key_pair,
std::chrono::seconds time_since_unix_epoch = GetWallTimeSinceUnixEpoch(),
bool make_ca = false,
X509* issuer = nullptr,
EVP_PKEY* issuer_key = nullptr);
// Exports the given X509 certificate as its DER-encoded binary form.
ErrorOr<std::vector<uint8_t>> ExportX509CertificateToDer(
const X509& certificate);
// Parses a DER-encoded X509 certificate from its binary form.
ErrorOr<bssl::UniquePtr<X509>> ImportCertificate(const uint8_t* der_x509_cert,
int der_x509_cert_length);
// Parses a DER-encoded RSAPrivateKey (RFC 3447).
ErrorOr<bssl::UniquePtr<EVP_PKEY>> ImportRSAPrivateKey(
const uint8_t* der_rsa_private_key,
int key_length);
std::string GetSpkiTlv(X509* cert);
ErrorOr<uint64_t> ParseDerUint64(ASN1_INTEGER* asn1int);
} // namespace openscreen
#endif // UTIL_CRYPTO_CERTIFICATE_UTILS_H_
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