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Load RSA slot_0 data from bootrom; load and decrypt data from native firm for NCCHSecure2 keyslot

This commit is contained in:
B3n30 2020-02-26 16:43:53 +01:00
parent 5b54a99f96
commit ebeea43fb8
4 changed files with 204 additions and 4 deletions
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2
src/core/CMakeLists.txt
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@ -421,6 +421,8 @@ add_library(core STATIC
hw/hw.h
hw/lcd.cpp
hw/lcd.h
hw/rsa/rsa.cpp
hw/rsa/rsa.h
hw/y2r.cpp
hw/y2r.h
loader/3dsx.cpp

68
src/core/hw/aes/key.cpp
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@ -8,6 +8,7 @@
#include <sstream>
#include <cryptopp/aes.h>
#include <cryptopp/modes.h>
#include <cryptopp/sha.h>
#include <fmt/format.h>
#include "common/common_paths.h"
#include "common/file_util.h"
@ -17,6 +18,7 @@
#include "core/hle/service/fs/archive.h"
#include "core/hw/aes/arithmetic128.h"
#include "core/hw/aes/key.h"
#include "core/hw/rsa/rsa.h"
namespace HW::AES {
@ -26,7 +28,7 @@ namespace {
// normal key dumped from a Wii U solving the equation:
// NormalKey = (((KeyX ROL 2) XOR KeyY) + constant) ROL 87
// On a real 3DS the generation for the normal key is hardware based, and thus the constant can't
// get dumped . generated normal keys are also not accesible on a 3DS. The used formula for
// get dumped. Generated normal keys are also not accesible on a 3DS. The used formula for
// calculating the constant is a software implementation of what the hardware generator does.
constexpr AESKey generator_constant = {{0x1F, 0xF9, 0xE9, 0xAA, 0xC5, 0xFE, 0x04, 0x08, 0x02, 0x45,
0x91, 0xDC, 0x5D, 0x52, 0x76, 0x8A}};
@ -203,13 +205,69 @@ void LoadBootromKeys() {
}
void LoadNativeFirmKeysOld3DS() {
constexpr u64 native_firm_id = 0x00040138'00000002;
FileSys::NCCHArchive archive(native_firm_id, Service::FS::MediaType::NAND);
std::array<char, 8> exefs_filepath = {'.', 'f', 'i', 'r', 'm', 0, 0, 0};
FileSys::Path file_path = FileSys::MakeNCCHFilePath(
FileSys::NCCHFileOpenType::NCCHData, 0, FileSys::NCCHFilePathType::ExeFS, exefs_filepath);
FileSys::Mode open_mode = {};
open_mode.read_flag.Assign(1);
auto file_result = archive.OpenFile(file_path, open_mode);
if (file_result.Failed())
return;
auto firm = std::move(file_result).Unwrap();
const std::size_t size = firm->GetSize();
if (size != 966656) {
LOG_ERROR(HW_AES, "native firm has wrong size {}", size);
return;
}
auto rsa = RSA::GetSlot(0);
if (!rsa) {
LOG_ERROR(HW_AES, "RSA slot is missing");
return;
}
std::vector<u8> firm_buffer(size);
firm->Read(0, firm_buffer.size(), firm_buffer.data());
firm->Close();
constexpr std::size_t SLOT_0x25_KEY_X_SECRET_OFFSET = 934444;
constexpr std::size_t SLOT_0x25_KEY_X_SECRET_SIZE = 64;
std::vector<u8> secret_data(SLOT_0x25_KEY_X_SECRET_SIZE);
std::memcpy(secret_data.data(), firm_buffer.data() + SLOT_0x25_KEY_X_SECRET_OFFSET,
secret_data.size());
auto asn1 = RSA::CreateASN1Message(secret_data);
auto result = rsa.GetSignature(asn1);
if (result.size() < 0x100) {
std::vector<u8> temp;
temp.resize(0x100 - result.size());
std::fill(temp.begin(), temp.end(), 0);
std::copy(result.begin(), result.end(), std::back_inserter(temp));
result = temp;
} else if (result.size() > 0x100) {
std::vector<u8> temp(result.begin(), result.begin() + 0x100);
result = temp;
}
CryptoPP::SHA256 sha;
std::array<u8, CryptoPP::SHA256::DIGESTSIZE> hash_result;
sha.CalculateDigest(hash_result.data(), result.data(), result.size());
AESKey key;
std::memcpy(key.data(), hash_result.data(), sizeof(key));
key_slots.at(0x2F).SetKeyY(key);
std::memcpy(key.data(), hash_result.data() + sizeof(key), sizeof(key));
key_slots.at(0x25).SetKeyX(key);
}
void LoadSaveModeNativeFirmKeysOld3DS() {
// Use the save mode native firm instead of the normal mode since there are only 2 version of it
// and thus we can use fixed offsets
constexpr u64 save_mode_native_firm_id = 0x00040138'00000003;
// TODO(B3N30): Add the 0x25 KeyX that gets initalized by native_firm
FileSys::NCCHArchive archive(save_mode_native_firm_id, Service::FS::MediaType::NAND);
std::array<char, 8> exefs_filepath = {'.', 'f', 'i', 'r', 'm', 0, 0, 0};
FileSys::Path file_path = FileSys::MakeNCCHFilePath(
@ -443,11 +501,13 @@ void InitKeys() {
static bool initialized = false;
if (initialized)
return;
initialized = true;
HW::RSA::InitSlots();
LoadBootromKeys();
LoadNativeFirmKeysOld3DS();
LoadSaveModeNativeFirmKeysOld3DS();
LoadNativeFirmKeysNew3DS();
LoadPresetKeys();
initialized = true;
}
void SetKeyX(std::size_t slot_id, const AESKey& key) {

102
src/core/hw/rsa/rsa.cpp Normal file
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@ -0,0 +1,102 @@
// Copyright 2020 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <sstream>
#include <cryptopp/integer.h>
#include <cryptopp/nbtheory.h>
#include <cryptopp/sha.h>
#include <fmt/format.h>
#include "common/common_paths.h"
#include "common/file_util.h"
#include "common/logging/log.h"
#include "common/string_util.h"
#include "core/hw/rsa/rsa.h"
namespace HW::RSA {
namespace {
std::vector<u8> HexToBytes(const std::string& hex) {
std::vector<u8> bytes;
for (unsigned int i = 0; i < hex.length(); i += 2) {
std::string byteString = hex.substr(i, 2);
u8 byte = (u8)strtol(byteString.c_str(), NULL, 16);
bytes.push_back(byte);
}
return bytes;
};
} // namespace
constexpr std::size_t SlotSize = 4;
std::array<RsaSlot, SlotSize> rsa_slots;
std::vector<u8> RsaSlot::GetSignature(const std::vector<u8>& message) {
CryptoPP::Integer sig =
CryptoPP::ModularExponentiation(CryptoPP::Integer(message.data(), message.size()),
CryptoPP::Integer(exponent.data(), exponent.size()),
CryptoPP::Integer(modulus.data(), modulus.size()));
std::stringstream ss;
ss << std::hex << sig;
return HexToBytes(ss.str());
}
void InitSlots() {
static bool initialized = false;
if (initialized)
return;
initialized = true;
const std::string filepath = FileUtil::GetUserPath(FileUtil::UserPath::SysDataDir) + BOOTROM9;
auto file = FileUtil::IOFile(filepath, "rb");
if (!file) {
return;
}
const std::size_t length = file.GetSize();
if (length != 65536) {
LOG_ERROR(HW_AES, "Bootrom9 size is wrong: {}", length);
return;
}
constexpr std::size_t RSA_MODULUS_POS = 0xB3E0;
file.Seek(RSA_MODULUS_POS, SEEK_SET);
std::vector<u8> modulus;
modulus.resize(256);
file.ReadArray(modulus.data(), modulus.size());
constexpr std::size_t RSA_EXPONENT_POS = 0xB4E0;
file.Seek(RSA_EXPONENT_POS, SEEK_SET);
std::vector<u8> exponent;
exponent.resize(256);
file.ReadArray(exponent.data(), exponent.size());
rsa_slots[0] = RsaSlot(exponent, modulus);
// TODO(B3N30): Initalize the other slots. But since they aren't used at all, we can skip them
// for now
}
RsaSlot GetSlot(std::size_t slot_id) {
if (slot_id >= rsa_slots.size())
return RsaSlot{};
return rsa_slots[slot_id];
}
std::vector<u8> CreateASN1Message(const std::vector<u8>& data) {
static constexpr auto asn1_header =
"0001FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
"FFFFFFFFFFFFFFFFFFFFFFFF003031300D060960864801650304020105000420";
std::vector<u8> message = HexToBytes(asn1_header);
CryptoPP::SHA256 sha;
std::array<u8, CryptoPP::SHA256::DIGESTSIZE> hash;
sha.CalculateDigest(hash.data(), data.data(), data.size());
std::copy(hash.begin(), hash.end(), std::back_inserter(message));
return message;
}
} // namespace HW::RSA

36
src/core/hw/rsa/rsa.h Normal file
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@ -0,0 +1,36 @@
// Copyright 2020 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <vector>
#include "common/common_types.h"
namespace HW::RSA {
class RsaSlot {
public:
RsaSlot() : init(false) {}
RsaSlot(const std::vector<u8>& exponent, const std::vector<u8>& modulus)
: init(true), exponent(exponent), modulus(modulus) {}
std::vector<u8> GetSignature(const std::vector<u8>& message);
operator bool() const {
// TODO(B3N30): Maybe check if exponent and modulus are vailid
return init;
}
private:
bool init;
std::vector<u8> exponent;
std::vector<u8> modulus;
};
void InitSlots();
RsaSlot GetSlot(std::size_t slot_id);
std::vector<u8> CreateASN1Message(const std::vector<u8>& data);
} // namespace HW::RSA