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/* crypto.h -- Code for deriving encryption keys.
Copyright (C) 2017 Jakob Kreuze, All Rights Reserved.
This file is part of Nekopack.
Nekopack is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
Nekopack is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with Nekopack. If not, see <http://www.gnu.org/licenses/>. */
#pragma once
#include <stdbool.h>
#include <stdint.h>
/* Game identifiers for use with get_key. */
enum {
NONE,
NEKOPARA_VOLUME_0,
NEKOPARA_VOLUME_0_STEAM,
NEKOPARA_VOLUME_1,
NEKOPARA_VOLUME_1_STEAM,
};
/* Structure containing game-specific encryption information. */
struct game_key {
bool uses_initial; /* Whether or not to use an initial key. */
uint32_t master; /* Master key specific to the game. */
uint8_t fallback_initial; /* Fallback if initial key is 0. */
uint8_t fallback_primary; /* Fallback if primary key is 0. */
};
/* Returns the game_key structure for a given game identifier, as
defined in crypto.h */
struct game_key get_key(int game);
/* Generates an initial key for the given key structure and file key. */
uint8_t derive_initial(struct game_key k, uint64_t file_key);
/* Generates a primary key for the given key structure and file key. */
uint8_t derive_primary(struct game_key k, uint64_t file_key);
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