mirror of
https://github.com/yuzu-emu/yuzu.git
synced 2024-08-21 16:23:22 +02:00
crypto: Eliminate magic constants
This commit is contained in:
parent
61a5b56abd
commit
42dc856ce1
@ -102,7 +102,7 @@ Loader::ResultStatus DeriveSDKeys(std::array<Key256, 2>& sd_keys, const KeyManag
|
||||
|
||||
AESCipher<Key128> cipher(sd_kek, Mode::ECB);
|
||||
for (size_t i = 0; i < 2; ++i) {
|
||||
for (size_t j = 0; j < 0x20; ++j)
|
||||
for (size_t j = 0; j < sd_key_sources[i].size(); ++j)
|
||||
sd_key_sources[i][j] ^= sd_seed[j & 0xF];
|
||||
cipher.Transcode(sd_key_sources[i].data(), sd_key_sources[i].size(), sd_keys[i].data(),
|
||||
Op::Decrypt);
|
||||
|
@ -8,6 +8,8 @@
|
||||
|
||||
namespace Core::Crypto {
|
||||
|
||||
constexpr u64 XTS_SECTOR_SIZE = 0x4000;
|
||||
|
||||
XTSEncryptionLayer::XTSEncryptionLayer(FileSys::VirtualFile base_, Key256 key_)
|
||||
: EncryptionLayer(std::move(base_)), cipher(key_, Mode::XTS) {}
|
||||
|
||||
@ -17,34 +19,35 @@ size_t XTSEncryptionLayer::Read(u8* data, size_t length, size_t offset) const {
|
||||
|
||||
const auto sector_offset = offset & 0x3FFF;
|
||||
if (sector_offset == 0) {
|
||||
if (length % 0x4000 == 0) {
|
||||
if (length % XTS_SECTOR_SIZE == 0) {
|
||||
std::vector<u8> raw = base->ReadBytes(length, offset);
|
||||
cipher.XTSTranscode(raw.data(), raw.size(), data, offset / 0x4000, 0x4000, Op::Decrypt);
|
||||
cipher.XTSTranscode(raw.data(), raw.size(), data, offset / XTS_SECTOR_SIZE,
|
||||
XTS_SECTOR_SIZE, Op::Decrypt);
|
||||
return raw.size();
|
||||
}
|
||||
if (length > 0x4000) {
|
||||
const auto rem = length % 0x4000;
|
||||
if (length > XTS_SECTOR_SIZE) {
|
||||
const auto rem = length % XTS_SECTOR_SIZE;
|
||||
const auto read = length - rem;
|
||||
return Read(data, read, offset) + Read(data + read, rem, offset + read);
|
||||
}
|
||||
std::vector<u8> buffer = base->ReadBytes(0x4000, offset);
|
||||
if (buffer.size() < 0x4000)
|
||||
buffer.resize(0x4000);
|
||||
cipher.XTSTranscode(buffer.data(), buffer.size(), buffer.data(), offset / 0x4000, 0x4000,
|
||||
Op::Decrypt);
|
||||
std::vector<u8> buffer = base->ReadBytes(XTS_SECTOR_SIZE, offset);
|
||||
if (buffer.size() < XTS_SECTOR_SIZE)
|
||||
buffer.resize(XTS_SECTOR_SIZE);
|
||||
cipher.XTSTranscode(buffer.data(), buffer.size(), buffer.data(), offset / XTS_SECTOR_SIZE,
|
||||
XTS_SECTOR_SIZE, Op::Decrypt);
|
||||
std::memcpy(data, buffer.data(), std::min(buffer.size(), length));
|
||||
return std::min(buffer.size(), length);
|
||||
}
|
||||
|
||||
// offset does not fall on block boundary (0x4000)
|
||||
std::vector<u8> block = base->ReadBytes(0x4000, offset - sector_offset);
|
||||
if (block.size() < 0x4000)
|
||||
block.resize(0x4000);
|
||||
cipher.XTSTranscode(block.data(), block.size(), block.data(), (offset - sector_offset) / 0x4000,
|
||||
0x4000, Op::Decrypt);
|
||||
const size_t read = 0x4000 - sector_offset;
|
||||
if (block.size() < XTS_SECTOR_SIZE)
|
||||
block.resize(XTS_SECTOR_SIZE);
|
||||
cipher.XTSTranscode(block.data(), block.size(), block.data(),
|
||||
(offset - sector_offset) / XTS_SECTOR_SIZE, XTS_SECTOR_SIZE, Op::Decrypt);
|
||||
const size_t read = XTS_SECTOR_SIZE - sector_offset;
|
||||
|
||||
if (length + sector_offset < 0x4000) {
|
||||
if (length + sector_offset < XTS_SECTOR_SIZE) {
|
||||
std::memcpy(data, block.data() + sector_offset, std::min<u64>(length, read));
|
||||
return std::min<u64>(length, read);
|
||||
}
|
||||
|
@ -19,6 +19,8 @@
|
||||
|
||||
namespace FileSys {
|
||||
|
||||
constexpr u64 NAX_HEADER_PADDING_SIZE = 0x4000;
|
||||
|
||||
template <typename SourceData, typename SourceKey, typename Destination>
|
||||
static bool CalculateHMAC256(Destination* out, const SourceKey* key, size_t key_length,
|
||||
const SourceData* data, size_t data_length) {
|
||||
@ -67,14 +69,14 @@ NAX::NAX(VirtualFile file_, std::array<u8, 0x10> nca_id)
|
||||
Common::HexArrayToString(nca_id, false)));
|
||||
}
|
||||
|
||||
Loader::ResultStatus NAX::Parse(std::string path) {
|
||||
Loader::ResultStatus NAX::Parse(std::string_view path) {
|
||||
if (file->ReadObject(header.get()) != sizeof(NAXHeader))
|
||||
return Loader::ResultStatus::ErrorBadNAXHeader;
|
||||
|
||||
if (header->magic != Common::MakeMagic('N', 'A', 'X', '0'))
|
||||
return Loader::ResultStatus::ErrorBadNAXHeader;
|
||||
|
||||
if (file->GetSize() < 0x4000 + header->file_size)
|
||||
if (file->GetSize() < NAX_HEADER_PADDING_SIZE + header->file_size)
|
||||
return Loader::ResultStatus::ErrorIncorrectNAXFileSize;
|
||||
|
||||
keys.DeriveSDSeedLazy();
|
||||
@ -87,14 +89,14 @@ Loader::ResultStatus NAX::Parse(std::string path) {
|
||||
const auto enc_keys = header->key_area;
|
||||
|
||||
size_t i = 0;
|
||||
for (; i < 2; ++i) {
|
||||
for (; i < sd_keys.size(); ++i) {
|
||||
std::array<Core::Crypto::Key128, 2> nax_keys{};
|
||||
if (!CalculateHMAC256(nax_keys.data(), sd_keys[i].data(), 0x10, path.c_str(),
|
||||
if (!CalculateHMAC256(nax_keys.data(), sd_keys[i].data(), 0x10, std::string(path).c_str(),
|
||||
path.size())) {
|
||||
return Loader::ResultStatus::ErrorNAXKeyHMACFailed;
|
||||
}
|
||||
|
||||
for (size_t j = 0; j < 2; ++j) {
|
||||
for (size_t j = 0; j < nax_keys.size(); ++j) {
|
||||
Core::Crypto::AESCipher<Core::Crypto::Key128> cipher(nax_keys[j],
|
||||
Core::Crypto::Mode::ECB);
|
||||
cipher.Transcode(enc_keys[j].data(), 0x10, header->key_area[j].data(),
|
||||
@ -117,28 +119,29 @@ Loader::ResultStatus NAX::Parse(std::string path) {
|
||||
type = static_cast<NAXContentType>(i);
|
||||
|
||||
Core::Crypto::Key256 final_key{};
|
||||
memcpy(final_key.data(), &header->key_area, 0x20);
|
||||
const auto enc_file = std::make_shared<OffsetVfsFile>(file, header->file_size, 0x4000);
|
||||
std::memcpy(final_key.data(), &header->key_area, final_key.size());
|
||||
const auto enc_file =
|
||||
std::make_shared<OffsetVfsFile>(file, header->file_size, NAX_HEADER_PADDING_SIZE);
|
||||
dec_file = std::make_shared<Core::Crypto::XTSEncryptionLayer>(enc_file, final_key);
|
||||
|
||||
return Loader::ResultStatus::Success;
|
||||
}
|
||||
|
||||
Loader::ResultStatus NAX::GetStatus() {
|
||||
Loader::ResultStatus NAX::GetStatus() const {
|
||||
return status;
|
||||
}
|
||||
|
||||
VirtualFile NAX::GetDecrypted() {
|
||||
VirtualFile NAX::GetDecrypted() const {
|
||||
return dec_file;
|
||||
}
|
||||
|
||||
std::shared_ptr<NCA> NAX::AsNCA() {
|
||||
std::shared_ptr<NCA> NAX::AsNCA() const {
|
||||
if (type == NAXContentType::NCA)
|
||||
return std::make_shared<NCA>(GetDecrypted());
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
NAXContentType NAX::GetContentType() {
|
||||
NAXContentType NAX::GetContentType() const {
|
||||
return type;
|
||||
}
|
||||
|
||||
|
@ -33,13 +33,13 @@ public:
|
||||
explicit NAX(VirtualFile file);
|
||||
explicit NAX(VirtualFile file, std::array<u8, 0x10> nca_id);
|
||||
|
||||
Loader::ResultStatus GetStatus();
|
||||
Loader::ResultStatus GetStatus() const;
|
||||
|
||||
VirtualFile GetDecrypted();
|
||||
VirtualFile GetDecrypted() const;
|
||||
|
||||
std::shared_ptr<NCA> AsNCA();
|
||||
std::shared_ptr<NCA> AsNCA() const;
|
||||
|
||||
NAXContentType GetContentType();
|
||||
NAXContentType GetContentType() const;
|
||||
|
||||
std::vector<std::shared_ptr<VfsFile>> GetFiles() const override;
|
||||
|
||||
@ -53,7 +53,7 @@ protected:
|
||||
bool ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) override;
|
||||
|
||||
private:
|
||||
Loader::ResultStatus Parse(std::string path);
|
||||
Loader::ResultStatus Parse(std::string_view path);
|
||||
|
||||
std::unique_ptr<NAXHeader> header;
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user