From 43e539561a4ea95274468b78735555d6e89fdfd9 Mon Sep 17 00:00:00 2001 From: jakob Date: Thu, 12 Jan 2017 17:09:17 -0500 Subject: Finished implementation of file decryption. There are still many memory corruption bugs and a segfault is not uncommon. --- src/crypto.h | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 src/crypto.h (limited to 'src/crypto.h') diff --git a/src/crypto.h b/src/crypto.h new file mode 100644 index 0000000..e82b934 --- /dev/null +++ b/src/crypto.h @@ -0,0 +1,39 @@ +/* This file is part of Nekopack. + + Copyright (C) 2017 Jakob Tsar-Fox, All Rights Reserved. + + 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 . */ + +#pragma once + +#include + +#include + +#include "cli.h" + +/* Struct for a game's encryption keys. */ +typedef struct { + int uses_initial_key; /* Set if first byte uses a different key. */ + uint32_t master_key; /* Master key used to derive a key. */ + uint8_t initial_fallback_key; /* Fallback for the initial key. */ + uint8_t primary_fallback_key; /* Fallback for the primary key. */ +} key; + +/* Returns the encryption keys for a given game value. */ +key get_encryption_key(game current_game); + +/* Decrypts the contents of a buffer according to a file key. */ +void decrypt_buffer(Bytef *encrypted_buffer, uint64_t buffer_length, + key encryption_key, uint32_t file_key); -- cgit v1.3