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Load AES keys stored in boot9.bin (#4335)

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* Load AES keys stored in boot9.bin
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Ben 2018-10-17 10:13:55 +02:00 committed by GitHub
parent 2a7b87874b
commit f48157c6ea
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 85 additions and 0 deletions
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1
src/common/common_paths.h
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@ -50,3 +50,4 @@
// Sys files
#define SHARED_FONT "shared_font.bin"
#define AES_KEYS "aes_keys.txt"
#define BOOTROM9 "boot9.bin"

84
src/core/hw/aes/key.cpp
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@ -6,6 +6,7 @@
#include <exception>
#include <optional>
#include <sstream>
#include <fmt/format.h>
#include "common/common_paths.h"
#include "common/file_util.h"
#include "common/logging/log.h"
@ -20,6 +21,13 @@ namespace {
std::optional<AESKey> generator_constant;
struct KeyDesc {
char key_type;
std::size_t slot_id;
// This key is identical to the key with the same key_type and slot_id -1
bool same_as_before;
};
struct KeySlot {
std::optional<AESKey> x;
std::optional<AESKey> y;
@ -70,6 +78,81 @@ AESKey HexToKey(const std::string& hex) {
return key;
}
void LoadBootromKeys() {
constexpr std::array<KeyDesc, 80> keys = {
{{'X', 0x2C, false}, {'X', 0x2D, true}, {'X', 0x2E, true}, {'X', 0x2F, true},
{'X', 0x30, false}, {'X', 0x31, true}, {'X', 0x32, true}, {'X', 0x33, true},
{'X', 0x34, false}, {'X', 0x35, true}, {'X', 0x36, true}, {'X', 0x37, true},
{'X', 0x38, false}, {'X', 0x39, true}, {'X', 0x3A, true}, {'X', 0x3B, true},
{'X', 0x3C, false}, {'X', 0x3D, false}, {'X', 0x3E, false}, {'X', 0x3F, false},
{'Y', 0x4, false}, {'Y', 0x5, false}, {'Y', 0x6, false}, {'Y', 0x7, false},
{'Y', 0x8, false}, {'Y', 0x9, false}, {'Y', 0xA, false}, {'Y', 0xB, false},
{'N', 0xC, false}, {'N', 0xD, true}, {'N', 0xE, true}, {'N', 0xF, true},
{'N', 0x10, false}, {'N', 0x11, true}, {'N', 0x12, true}, {'N', 0x13, true},
{'N', 0x14, false}, {'N', 0x15, false}, {'N', 0x16, false}, {'N', 0x17, false},
{'N', 0x18, false}, {'N', 0x19, true}, {'N', 0x1A, true}, {'N', 0x1B, true},
{'N', 0x1C, false}, {'N', 0x1D, true}, {'N', 0x1E, true}, {'N', 0x1F, true},
{'N', 0x20, false}, {'N', 0x21, true}, {'N', 0x22, true}, {'N', 0x23, true},
{'N', 0x24, false}, {'N', 0x25, true}, {'N', 0x26, true}, {'N', 0x27, true},
{'N', 0x28, true}, {'N', 0x29, false}, {'N', 0x2A, false}, {'N', 0x2B, false},
{'N', 0x2C, false}, {'N', 0x2D, true}, {'N', 0x2E, true}, {'N', 0x2F, true},
{'N', 0x30, false}, {'N', 0x31, true}, {'N', 0x32, true}, {'N', 0x33, true},
{'N', 0x34, false}, {'N', 0x35, true}, {'N', 0x36, true}, {'N', 0x37, true},
{'N', 0x38, false}, {'N', 0x39, true}, {'N', 0x3A, true}, {'N', 0x3B, true},
{'N', 0x3C, true}, {'N', 0x3D, false}, {'N', 0x3E, false}, {'N', 0x3F, false}}};
// Bootrom sets all these keys when executed, but later some of the normal keys get overwritten
// by other applications e.g. process9. These normal keys thus aren't used by any application
// and have no value for emulation
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 KEY_SECTION_START = 55760;
file.Seek(KEY_SECTION_START, SEEK_SET); // Jump to the key section
AESKey new_key;
for (const auto& key : keys) {
if (!key.same_as_before) {
file.ReadArray(new_key.data(), new_key.size());
if (!file) {
LOG_ERROR(HW_AES, "Reading from Bootrom9 failed");
return;
}
}
std::string s;
for (auto pos : new_key) {
s += fmt::format("{:02X}", pos);
}
LOG_DEBUG(HW_AES, "Loaded Slot{:#02x} Key{}: {}", key.slot_id, key.key_type, s);
switch (key.key_type) {
case 'X':
key_slots.at(key.slot_id).SetKeyX(new_key);
break;
case 'Y':
key_slots.at(key.slot_id).SetKeyY(new_key);
break;
case 'N':
key_slots.at(key.slot_id).SetNormalKey(new_key);
break;
default:
LOG_ERROR(HW_AES, "Invalid key type {}", key.key_type);
break;
}
}
}
void LoadPresetKeys() {
const std::string filepath = FileUtil::GetUserPath(FileUtil::UserPath::SysDataDir) + AES_KEYS;
FileUtil::CreateFullPath(filepath); // Create path if not already created
@ -148,6 +231,7 @@ void InitKeys() {
static bool initialized = false;
if (initialized)
return;
LoadBootromKeys();
LoadPresetKeys();
initialized = true;
}