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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_RSA_PRIVATE_KEY_H_
#define UTIL_CRYPTO_RSA_PRIVATE_KEY_H_
#include <openssl/base.h>
#include <openssl/evp.h>
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <vector>
#include "platform/base/error.h"
#include "platform/base/macros.h"
namespace openscreen {
// Encapsulates an RSA private key. Can be used to generate new keys, export
// keys to other formats, or to extract a public key.
class RSAPrivateKey {
public:
RSAPrivateKey(RSAPrivateKey&& other) noexcept = default;
RSAPrivateKey& operator=(RSAPrivateKey&& other) = default;
~RSAPrivateKey();
// Create a new random instance. Can return nullptr if initialization fails.
static ErrorOr<RSAPrivateKey> Create(uint16_t num_bits);
// Create a new instance by importing an existing private key. The format is
// an ASN.1-encoded PrivateKeyInfo block from PKCS #8.
static ErrorOr<RSAPrivateKey> CreateFromPrivateKeyInfo(
const std::vector<uint8_t>& input);
// Create a new instance from an existing EVP_PKEY, taking a
// reference to it. |key| must be an RSA key.
static ErrorOr<RSAPrivateKey> CreateFromKey(EVP_PKEY* key);
// Creates a copy of the object.
ErrorOr<RSAPrivateKey> Copy() const;
EVP_PKEY* key() { return key_.get(); }
const EVP_PKEY* key() const { return key_.get(); }
// Exports the private key to a PKCS #8 PrivateKeyInfo block.
ErrorOr<std::vector<uint8_t>> ExportPrivateKey() const;
// Exports the public key to an X509 SubjectPublicKeyInfo block.
ErrorOr<std::vector<uint8_t>> ExportPublicKey() const;
private:
// Constructor is private. Use one of the Create*() methods above instead.
RSAPrivateKey();
bssl::UniquePtr<EVP_PKEY> key_;
OSP_DISALLOW_COPY_AND_ASSIGN(RSAPrivateKey);
};
} // namespace openscreen
#endif // UTIL_CRYPTO_RSA_PRIVATE_KEY_H_
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