initial commit, 4.5 stable

core/io/file_access_encrypted.h

@@ -0,0 +1,110 @@
+/**************************************************************************/
+/*  file_access_encrypted.h                                               */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* 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.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "core/crypto/crypto_core.h"
+#include "core/io/file_access.h"
+
+#define ENCRYPTED_HEADER_MAGIC 0x43454447
+
+class FileAccessEncrypted : public FileAccess {
+	GDSOFTCLASS(FileAccessEncrypted, FileAccess);
+
+public:
+	enum Mode : int32_t {
+		MODE_READ,
+		MODE_WRITE_AES256,
+		MODE_MAX
+	};
+
+private:
+	Vector<uint8_t> iv;
+	Vector<uint8_t> key;
+	bool writing = false;
+	Ref<FileAccess> file;
+	uint64_t base = 0;
+	uint64_t length = 0;
+	Vector<uint8_t> data;
+	mutable uint64_t pos = 0;
+	mutable bool eofed = false;
+	bool use_magic = true;
+
+	void _close();
+
+	static CryptoCore::RandomGenerator *_fae_static_rng;
+
+public:
+	Error open_and_parse(Ref<FileAccess> p_base, const Vector<uint8_t> &p_key, Mode p_mode, bool p_with_magic = true, const Vector<uint8_t> &p_iv = Vector<uint8_t>());
+	Error open_and_parse_password(Ref<FileAccess> p_base, const String &p_key, Mode p_mode);
+
+	Vector<uint8_t> get_iv() const { return iv; }
+
+	virtual Error open_internal(const String &p_path, int p_mode_flags) override; ///< open a file
+	virtual bool is_open() const override; ///< true when file is open
+
+	virtual String get_path() const override; /// returns the path for the current open file
+	virtual String get_path_absolute() const override; /// returns the absolute path for the current open file
+
+	virtual void seek(uint64_t p_position) override; ///< seek to a given position
+	virtual void seek_end(int64_t p_position = 0) override; ///< seek from the end of file
+	virtual uint64_t get_position() const override; ///< get position in the file
+	virtual uint64_t get_length() const override; ///< get size of the file
+
+	virtual bool eof_reached() const override; ///< reading passed EOF
+
+	virtual uint64_t get_buffer(uint8_t *p_dst, uint64_t p_length) const override;
+
+	virtual Error get_error() const override; ///< get last error
+
+	virtual Error resize(int64_t p_length) override { return ERR_UNAVAILABLE; }
+	virtual void flush() override;
+	virtual bool store_buffer(const uint8_t *p_src, uint64_t p_length) override; ///< store an array of bytes
+
+	virtual bool file_exists(const String &p_name) override; ///< return true if a file exists
+
+	virtual uint64_t _get_modified_time(const String &p_file) override;
+	virtual uint64_t _get_access_time(const String &p_file) override;
+	virtual int64_t _get_size(const String &p_file) override;
+	virtual BitField<FileAccess::UnixPermissionFlags> _get_unix_permissions(const String &p_file) override;
+	virtual Error _set_unix_permissions(const String &p_file, BitField<FileAccess::UnixPermissionFlags> p_permissions) override;
+
+	virtual bool _get_hidden_attribute(const String &p_file) override;
+	virtual Error _set_hidden_attribute(const String &p_file, bool p_hidden) override;
+	virtual bool _get_read_only_attribute(const String &p_file) override;
+	virtual Error _set_read_only_attribute(const String &p_file, bool p_ro) override;
+
+	virtual void close() override;
+
+	static void deinitialize();
+
+	FileAccessEncrypted() {}
+	~FileAccessEncrypted();
+};