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https://github.com/citra-emu/citra-canary.git
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Merge pull request #5108 from B3n30/load_aes_key_X0x25_from_nativeFirm
Load NCCHSecure2 keyX from native firm
This commit is contained in:
Hamish Milne
GitHub
commit
ab998b04c8
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@ -421,6 +421,8 @@ add_library(core STATIC
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hw/hw.h
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hw/lcd.cpp
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hw/lcd.h
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hw/rsa/rsa.cpp
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hw/rsa/rsa.h
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hw/y2r.cpp
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hw/y2r.h
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loader/3dsx.cpp
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@ -8,6 +8,7 @@
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#include <sstream>
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#include <cryptopp/aes.h>
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#include <cryptopp/modes.h>
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#include <cryptopp/sha.h>
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#include <fmt/format.h>
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#include "common/common_paths.h"
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#include "common/file_util.h"
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@ -17,6 +18,7 @@
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#include "core/hle/service/fs/archive.h"
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#include "core/hw/aes/arithmetic128.h"
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#include "core/hw/aes/key.h"
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#include "core/hw/rsa/rsa.h"
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namespace HW::AES {
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@ -26,7 +28,7 @@ namespace {
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// normal key dumped from a Wii U solving the equation:
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// NormalKey = (((KeyX ROL 2) XOR KeyY) + constant) ROL 87
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// On a real 3DS the generation for the normal key is hardware based, and thus the constant can't
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// get dumped . generated normal keys are also not accesible on a 3DS. The used formula for
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// get dumped. Generated normal keys are also not accesible on a 3DS. The used formula for
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// calculating the constant is a software implementation of what the hardware generator does.
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constexpr AESKey generator_constant = {{0x1F, 0xF9, 0xE9, 0xAA, 0xC5, 0xFE, 0x04, 0x08, 0x02, 0x45,
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0x91, 0xDC, 0x5D, 0x52, 0x76, 0x8A}};
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@ -203,14 +205,67 @@ void LoadBootromKeys() {
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}
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void LoadNativeFirmKeysOld3DS() {
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// Use the save mode native firm instead of the normal mode since there are only 2 version of it
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constexpr u64 native_firm_id = 0x00040138'00000002;
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FileSys::NCCHArchive archive(native_firm_id, Service::FS::MediaType::NAND);
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std::array<char, 8> exefs_filepath = {'.', 'f', 'i', 'r', 'm', 0, 0, 0};
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FileSys::Path file_path = FileSys::MakeNCCHFilePath(
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FileSys::NCCHFileOpenType::NCCHData, 0, FileSys::NCCHFilePathType::ExeFS, exefs_filepath);
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FileSys::Mode open_mode = {};
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open_mode.read_flag.Assign(1);
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auto file_result = archive.OpenFile(file_path, open_mode);
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if (file_result.Failed())
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return;
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auto firm = std::move(file_result).Unwrap();
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const std::size_t size = firm->GetSize();
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if (size != 966656) {
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LOG_ERROR(HW_AES, "native firm has wrong size {}", size);
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return;
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}
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auto rsa = RSA::GetSlot(0);
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if (!rsa) {
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LOG_ERROR(HW_AES, "RSA slot is missing");
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return;
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}
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std::vector<u8> firm_buffer(size);
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firm->Read(0, firm_buffer.size(), firm_buffer.data());
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firm->Close();
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constexpr std::size_t SLOT_0x25_KEY_X_SECRET_OFFSET = 933480;
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constexpr std::size_t SLOT_0x25_KEY_X_SECRET_SIZE = 64;
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std::vector<u8> secret_data(SLOT_0x25_KEY_X_SECRET_SIZE);
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std::memcpy(secret_data.data(), firm_buffer.data() + SLOT_0x25_KEY_X_SECRET_OFFSET,
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secret_data.size());
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auto asn1 = RSA::CreateASN1Message(secret_data);
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auto result = rsa.GetSignature(asn1);
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if (result.size() < 0x100) {
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std::vector<u8> temp(0x100);
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std::copy(result.begin(), result.end(), temp.end() - result.size());
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result = temp;
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} else if (result.size() > 0x100) {
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result.resize(0x100);
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}
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CryptoPP::SHA256 sha;
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std::array<u8, CryptoPP::SHA256::DIGESTSIZE> hash_result;
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sha.CalculateDigest(hash_result.data(), result.data(), result.size());
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AESKey key;
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std::memcpy(key.data(), hash_result.data(), sizeof(key));
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key_slots.at(0x2F).SetKeyY(key);
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std::memcpy(key.data(), hash_result.data() + sizeof(key), sizeof(key));
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key_slots.at(0x25).SetKeyX(key);
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}
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void LoadSafeModeNativeFirmKeysOld3DS() {
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// Use the safe mode native firm instead of the normal mode since there are only 2 version of it
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// and thus we can use fixed offsets
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constexpr u64 save_mode_native_firm_id = 0x00040138'00000003;
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constexpr u64 safe_mode_native_firm_id = 0x00040138'00000003;
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// TODO(B3N30): Add the 0x25 KeyX that gets initalized by native_firm
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FileSys::NCCHArchive archive(save_mode_native_firm_id, Service::FS::MediaType::NAND);
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FileSys::NCCHArchive archive(safe_mode_native_firm_id, Service::FS::MediaType::NAND);
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std::array<char, 8> exefs_filepath = {'.', 'f', 'i', 'r', 'm', 0, 0, 0};
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FileSys::Path file_path = FileSys::MakeNCCHFilePath(
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FileSys::NCCHFileOpenType::NCCHData, 0, FileSys::NCCHFilePathType::ExeFS, exefs_filepath);
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@ -223,7 +278,7 @@ void LoadNativeFirmKeysOld3DS() {
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auto firm = std::move(file_result).Unwrap();
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const std::size_t size = firm->GetSize();
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if (size != 843776) {
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LOG_ERROR(HW_AES, "save mode native firm has wrong size {}", size);
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LOG_ERROR(HW_AES, "safe mode native firm has wrong size {}", size);
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return;
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}
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std::vector<u8> firm_buffer(size);
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@ -265,16 +320,16 @@ void LoadNativeFirmKeysNew3DS() {
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AESKey secret_key;
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secret.ReadArray(secret_key.data(), secret_key.size());
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// Use the save mode native firm instead of the normal mode since there are only 1 version of it
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// Use the safe mode native firm instead of the normal mode since there are only 1 version of it
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// and thus we can use fixed offsets
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constexpr u64 save_mode_native_firm_id = 0x00040138'20000003;
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constexpr u64 safe_mode_native_firm_id = 0x00040138'20000003;
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// TODO(B3N30): Add the 0x25 KeyX that gets initalized by native_firm
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// TODO(B3N30): Add the 0x18 - 0x1F KeyX that gets initalized by native_firm. This probably
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// requires the normal native firm with version > 9.6.0-X
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FileSys::NCCHArchive archive(save_mode_native_firm_id, Service::FS::MediaType::NAND);
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FileSys::NCCHArchive archive(safe_mode_native_firm_id, Service::FS::MediaType::NAND);
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std::array<char, 8> exefs_filepath = {'.', 'f', 'i', 'r', 'm', 0, 0, 0};
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FileSys::Path file_path = FileSys::MakeNCCHFilePath(
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FileSys::NCCHFileOpenType::NCCHData, 0, FileSys::NCCHFilePathType::ExeFS, exefs_filepath);
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@ -296,7 +351,7 @@ void LoadNativeFirmKeysNew3DS() {
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return a | b << 8 | c << 16 | d << 24;
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};
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if (MakeMagic('F', 'I', 'R', 'M') != header.magic) {
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LOG_ERROR(HW_AES, "N3DS SAVE MODE Native Firm has wrong header {}", header.magic);
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LOG_ERROR(HW_AES, "N3DS SAFE MODE Native Firm has wrong header {}", header.magic);
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return;
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}
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@ -443,11 +498,13 @@ void InitKeys() {
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static bool initialized = false;
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if (initialized)
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return;
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initialized = true;
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HW::RSA::InitSlots();
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LoadBootromKeys();
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LoadNativeFirmKeysOld3DS();
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LoadSafeModeNativeFirmKeysOld3DS();
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LoadNativeFirmKeysNew3DS();
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LoadPresetKeys();
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initialized = true;
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}
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void SetKeyX(std::size_t slot_id, const AESKey& key) {
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113
src/core/hw/rsa/rsa.cpp
Normal file
113
src/core/hw/rsa/rsa.cpp
Normal file
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@ -0,0 +1,113 @@
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// Copyright 2020 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <sstream>
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#include <cryptopp/hex.h>
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#include <cryptopp/integer.h>
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#include <cryptopp/nbtheory.h>
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#include <cryptopp/sha.h>
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#include <fmt/format.h>
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#include "common/common_paths.h"
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#include "common/file_util.h"
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#include "common/logging/log.h"
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#include "core/hw/rsa/rsa.h"
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namespace HW::RSA {
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namespace {
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std::vector<u8> HexToBytes(const std::string& hex) {
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std::vector<u8> bytes;
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for (unsigned int i = 0; i < hex.length(); i += 2) {
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std::string byteString = hex.substr(i, 2);
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u8 byte = static_cast<u8>(std::strtol(byteString.c_str(), nullptr, 16));
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bytes.push_back(byte);
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}
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return bytes;
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};
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} // namespace
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constexpr std::size_t SlotSize = 4;
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std::array<RsaSlot, SlotSize> rsa_slots;
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std::vector<u8> RsaSlot::GetSignature(const std::vector<u8>& message) {
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CryptoPP::Integer sig =
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CryptoPP::ModularExponentiation(CryptoPP::Integer(message.data(), message.size()),
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CryptoPP::Integer(exponent.data(), exponent.size()),
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CryptoPP::Integer(modulus.data(), modulus.size()));
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std::stringstream ss;
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ss << std::hex << sig;
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CryptoPP::HexDecoder decoder;
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decoder.Put(reinterpret_cast<unsigned char*>(ss.str().data()), ss.str().size());
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decoder.MessageEnd();
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std::vector<u8> result(decoder.MaxRetrievable());
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decoder.Get(result.data(), result.size());
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return HexToBytes(ss.str());
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}
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void InitSlots() {
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static bool initialized = false;
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if (initialized)
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return;
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initialized = true;
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const std::string filepath = FileUtil::GetUserPath(FileUtil::UserPath::SysDataDir) + BOOTROM9;
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FileUtil::IOFile file(filepath, "rb");
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if (!file) {
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return;
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}
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const std::size_t length = file.GetSize();
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if (length != 65536) {
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LOG_ERROR(HW_AES, "Bootrom9 size is wrong: {}", length);
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return;
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}
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constexpr std::size_t RSA_MODULUS_POS = 0xB3E0;
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file.Seek(RSA_MODULUS_POS, SEEK_SET);
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std::vector<u8> modulus(256);
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file.ReadArray(modulus.data(), modulus.size());
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constexpr std::size_t RSA_EXPONENT_POS = 0xB4E0;
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file.Seek(RSA_EXPONENT_POS, SEEK_SET);
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std::vector<u8> exponent(256);
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file.ReadArray(exponent.data(), exponent.size());
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rsa_slots[0] = RsaSlot(exponent, modulus);
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// TODO(B3N30): Initalize the other slots. But since they aren't used at all, we can skip them
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// for now
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}
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RsaSlot GetSlot(std::size_t slot_id) {
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if (slot_id >= rsa_slots.size())
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return RsaSlot{};
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return rsa_slots[slot_id];
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}
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std::vector<u8> CreateASN1Message(const std::vector<u8>& data) {
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static constexpr std::array<u8, 224> asn1_header = {
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{0x00, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x30, 0x31, 0x30, 0x0D, 0x06,
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0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20}};
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std::vector<u8> message(asn1_header.begin(), asn1_header.end());
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CryptoPP::SHA256 sha;
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message.resize(message.size() + CryptoPP::SHA256::DIGESTSIZE);
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sha.CalculateDigest(message.data() + asn1_header.size(), data.data(), data.size());
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return message;
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}
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} // namespace HW::RSA
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36
src/core/hw/rsa/rsa.h
Normal file
36
src/core/hw/rsa/rsa.h
Normal file
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@ -0,0 +1,36 @@
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// Copyright 2020 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <vector>
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#include "common/common_types.h"
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namespace HW::RSA {
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class RsaSlot {
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public:
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RsaSlot() : init(false) {}
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RsaSlot(const std::vector<u8>& exponent, const std::vector<u8>& modulus)
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: init(true), exponent(exponent), modulus(modulus) {}
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std::vector<u8> GetSignature(const std::vector<u8>& message);
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operator bool() const {
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// TODO(B3N30): Maybe check if exponent and modulus are vailid
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return init;
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}
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private:
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bool init;
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std::vector<u8> exponent;
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std::vector<u8> modulus;
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};
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void InitSlots();
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RsaSlot GetSlot(std::size_t slot_id);
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std::vector<u8> CreateASN1Message(const std::vector<u8>& data);
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} // namespace HW::RSA
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