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/*************************************************************************/
/* crypto.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef CRYPTO_H
#define CRYPTO_H
#include "core/crypto/hashing_context.h"
#include "core/io/resource.h"
#include "core/io/resource_loader.h"
#include "core/io/resource_saver.h"
#include "core/object/reference.h"
class CryptoKey : public Resource {
GDCLASS(CryptoKey, Resource);
protected:
static void _bind_methods();
static CryptoKey *(*_create)();
public:
static CryptoKey *create();
virtual Error load(String p_path, bool p_public_only = false) = 0;
virtual Error save(String p_path, bool p_public_only = false) = 0;
virtual String save_to_string(bool p_public_only = false) = 0;
virtual Error load_from_string(String p_string_key, bool p_public_only = false) = 0;
virtual bool is_public_only() const = 0;
};
class X509Certificate : public Resource {
GDCLASS(X509Certificate, Resource);
protected:
static void _bind_methods();
static X509Certificate *(*_create)();
public:
static X509Certificate *create();
virtual Error load(String p_path) = 0;
virtual Error load_from_memory(const uint8_t *p_buffer, int p_len) = 0;
virtual Error save(String p_path) = 0;
};
class HMACContext : public Reference {
GDCLASS(HMACContext, Reference);
protected:
static void _bind_methods();
static HMACContext *(*_create)();
public:
static HMACContext *create();
virtual Error start(HashingContext::HashType p_hash_type, PackedByteArray p_key) = 0;
virtual Error update(PackedByteArray p_data) = 0;
virtual PackedByteArray finish() = 0;
HMACContext() {}
};
class Crypto : public Reference {
GDCLASS(Crypto, Reference);
protected:
static void _bind_methods();
static Crypto *(*_create)();
static void (*_load_default_certificates)(String p_path);
public:
static Crypto *create();
static void load_default_certificates(String p_path);
virtual PackedByteArray generate_random_bytes(int p_bytes) = 0;
virtual Ref<CryptoKey> generate_rsa(int p_bytes) = 0;
virtual Ref<X509Certificate> generate_self_signed_certificate(Ref<CryptoKey> p_key, String p_issuer_name, String p_not_before, String p_not_after) = 0;
virtual Vector<uint8_t> sign(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Ref<CryptoKey> p_key) = 0;
virtual bool verify(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Vector<uint8_t> p_signature, Ref<CryptoKey> p_key) = 0;
virtual Vector<uint8_t> encrypt(Ref<CryptoKey> p_key, Vector<uint8_t> p_plaintext) = 0;
virtual Vector<uint8_t> decrypt(Ref<CryptoKey> p_key, Vector<uint8_t> p_ciphertext) = 0;
PackedByteArray hmac_digest(HashingContext::HashType p_hash_type, PackedByteArray p_key, PackedByteArray p_msg);
// Compares two PackedByteArrays for equality without leaking timing information in order to prevent timing attacks.
// @see: https://paragonie.com/blog/2015/11/preventing-timing-attacks-on-string-comparison-with-double-hmac-strategy
bool constant_time_compare(PackedByteArray p_trusted, PackedByteArray p_received);
Crypto() {}
};
class ResourceFormatLoaderCrypto : public ResourceFormatLoader {
public:
virtual RES load(const String &p_path, const String &p_original_path = "", Error *r_error = nullptr, bool p_use_sub_threads = false, float *r_progress = nullptr, bool p_no_cache = false);
virtual void get_recognized_extensions(List<String> *p_extensions) const;
virtual bool handles_type(const String &p_type) const;
virtual String get_resource_type(const String &p_path) const;
};
class ResourceFormatSaverCrypto : public ResourceFormatSaver {
public:
virtual Error save(const String &p_path, const RES &p_resource, uint32_t p_flags = 0);
virtual void get_recognized_extensions(const RES &p_resource, List<String> *p_extensions) const;
virtual bool recognize(const RES &p_resource) const;
};
#endif // CRYPTO_H
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