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feat: Add support for encrypted NCSD

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Missing version 1 support and seeded crypto but that would be enough for now.
This commit is contained in:
Mary 2023-06-19 23:13:38 +02:00
parent 2e5bc0cb14
commit 86dd7f54f5
8 changed files with 305 additions and 138 deletions
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21
include/loader/ncch.hpp
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@ -1,14 +1,22 @@
#pragma once
#include <array>
#include <optional>
#include <vector>
#include "io_file.hpp"
#include "helpers.hpp"
#include "crypto/aes_engine.hpp"
struct NCCH {
struct EncryptionInfo {
Crypto::AESKey normalKey;
Crypto::AESKey initialCounter;
};
struct FSInfo { // Info on the ExeFS/RomFS
u64 offset = 0;
u64 size = 0;
u64 hashRegionSize = 0;
std::optional<EncryptionInfo> encryptionInfo;
};
// Descriptions for .text, .data and .rodata sections
@ -34,6 +42,8 @@ struct NCCH {
bool mountRomFS = false;
bool encrypted = false;
bool fixedCryptoKey = false;
bool seedCrypto = false;
u8 secondaryKeySlot = 0;
static constexpr u64 mediaUnit = 0x200;
u64 size = 0; // Size of NCCH converted to bytes
@ -41,6 +51,7 @@ struct NCCH {
u32 bssSize = 0;
u32 exheaderSize = 0;
FSInfo exheaderInfo;
FSInfo exeFS;
FSInfo romFS;
CodeSetInfo text, data, rodata;
@ -50,10 +61,9 @@ struct NCCH {
// Contains of the cart's save data
std::vector<u8> saveData;
// Header: 0x200 + 0x800 byte NCCH header + exheadr
// Returns true on success, false on failure
// Partition index/offset/size must have been set before this
bool loadFromHeader(u8* header, IOFile& file);
bool loadFromHeader(Crypto::AESEngine &aesEngine, IOFile& file, const FSInfo &info);
bool hasExtendedHeader() { return exheaderSize != 0; }
bool hasExeFS() { return exeFS.size != 0; }
@ -61,7 +71,8 @@ struct NCCH {
bool hasCode() { return codeFile.size() != 0; }
bool hasSaveData() { return saveData.size() != 0; }
private:
std::array<u8, 16> primaryKey = {}; // For exheader, ExeFS header and icons
std::array<u8, 16> secondaryKey = {}; // For RomFS and some files in ExeFS
std::pair<bool, Crypto::AESKey> getPrimaryKey(Crypto::AESEngine &aesEngine, const Crypto::AESKey &keyY);
std::pair<bool, Crypto::AESKey> getSecondaryKey(Crypto::AESEngine &aesEngine, const Crypto::AESKey &keyY);
std::pair<bool, std::size_t> readFromFile(IOFile& file, const FSInfo &info, u8 *dst, std::size_t offset, std::size_t size);
};