588 lines
20 KiB
C++
588 lines
20 KiB
C++
// Copyright 2018 yuzu emulator team
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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 <algorithm>
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#include <cstring>
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#include <optional>
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#include <ranges>
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#include <utility>
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#include "common/logging/log.h"
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#include "core/crypto/aes_util.h"
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#include "core/crypto/ctr_encryption_layer.h"
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#include "core/crypto/key_manager.h"
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#include "core/file_sys/content_archive.h"
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#include "core/file_sys/nca_patch.h"
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#include "core/file_sys/partition_filesystem.h"
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#include "core/file_sys/vfs_offset.h"
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#include "core/loader/loader.h"
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namespace FileSys {
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// Media offsets in headers are stored divided by 512. Mult. by this to get real offset.
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constexpr u64 MEDIA_OFFSET_MULTIPLIER = 0x200;
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constexpr u64 SECTION_HEADER_SIZE = 0x200;
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constexpr u64 SECTION_HEADER_OFFSET = 0x400;
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constexpr u32 IVFC_MAX_LEVEL = 6;
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enum class NCASectionFilesystemType : u8 {
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PFS0 = 0x2,
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ROMFS = 0x3,
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};
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struct IVFCLevel {
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u64_le offset;
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u64_le size;
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u32_le block_size;
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u32_le reserved;
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};
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static_assert(sizeof(IVFCLevel) == 0x18, "IVFCLevel has incorrect size.");
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struct IVFCHeader {
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u32_le magic;
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u32_le magic_number;
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INSERT_PADDING_BYTES_NOINIT(8);
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std::array<IVFCLevel, 6> levels;
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INSERT_PADDING_BYTES_NOINIT(64);
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};
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static_assert(sizeof(IVFCHeader) == 0xE0, "IVFCHeader has incorrect size.");
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struct NCASectionHeaderBlock {
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INSERT_PADDING_BYTES_NOINIT(3);
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NCASectionFilesystemType filesystem_type;
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NCASectionCryptoType crypto_type;
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INSERT_PADDING_BYTES_NOINIT(3);
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};
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static_assert(sizeof(NCASectionHeaderBlock) == 0x8, "NCASectionHeaderBlock has incorrect size.");
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struct NCASectionRaw {
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NCASectionHeaderBlock header;
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std::array<u8, 0x138> block_data;
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std::array<u8, 0x8> section_ctr;
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INSERT_PADDING_BYTES_NOINIT(0xB8);
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};
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static_assert(sizeof(NCASectionRaw) == 0x200, "NCASectionRaw has incorrect size.");
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struct PFS0Superblock {
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NCASectionHeaderBlock header_block;
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std::array<u8, 0x20> hash;
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u32_le size;
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INSERT_PADDING_BYTES_NOINIT(4);
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u64_le hash_table_offset;
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u64_le hash_table_size;
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u64_le pfs0_header_offset;
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u64_le pfs0_size;
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INSERT_PADDING_BYTES_NOINIT(0x1B0);
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};
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static_assert(sizeof(PFS0Superblock) == 0x200, "PFS0Superblock has incorrect size.");
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struct RomFSSuperblock {
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NCASectionHeaderBlock header_block;
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IVFCHeader ivfc;
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INSERT_PADDING_BYTES_NOINIT(0x118);
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};
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static_assert(sizeof(RomFSSuperblock) == 0x200, "RomFSSuperblock has incorrect size.");
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struct BKTRHeader {
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u64_le offset;
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u64_le size;
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u32_le magic;
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INSERT_PADDING_BYTES_NOINIT(0x4);
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u32_le number_entries;
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INSERT_PADDING_BYTES_NOINIT(0x4);
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};
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static_assert(sizeof(BKTRHeader) == 0x20, "BKTRHeader has incorrect size.");
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struct BKTRSuperblock {
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NCASectionHeaderBlock header_block;
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IVFCHeader ivfc;
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INSERT_PADDING_BYTES_NOINIT(0x18);
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BKTRHeader relocation;
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BKTRHeader subsection;
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INSERT_PADDING_BYTES_NOINIT(0xC0);
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};
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static_assert(sizeof(BKTRSuperblock) == 0x200, "BKTRSuperblock has incorrect size.");
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union NCASectionHeader {
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NCASectionRaw raw{};
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PFS0Superblock pfs0;
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RomFSSuperblock romfs;
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BKTRSuperblock bktr;
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};
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static_assert(sizeof(NCASectionHeader) == 0x200, "NCASectionHeader has incorrect size.");
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static bool IsValidNCA(const NCAHeader& header) {
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// TODO(DarkLordZach): Add NCA2/NCA0 support.
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return header.magic == Common::MakeMagic('N', 'C', 'A', '3');
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}
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NCA::NCA(VirtualFile file_, VirtualFile bktr_base_romfs_, u64 bktr_base_ivfc_offset)
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: file(std::move(file_)),
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bktr_base_romfs(std::move(bktr_base_romfs_)), keys{Core::Crypto::KeyManager::Instance()} {
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if (file == nullptr) {
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status = Loader::ResultStatus::ErrorNullFile;
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return;
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}
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if (sizeof(NCAHeader) != file->ReadObject(&header)) {
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LOG_ERROR(Loader, "File reader errored out during header read.");
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status = Loader::ResultStatus::ErrorBadNCAHeader;
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return;
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}
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if (!HandlePotentialHeaderDecryption()) {
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return;
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}
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has_rights_id = std::ranges::any_of(header.rights_id, [](char c) { return c != '\0'; });
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const std::vector<NCASectionHeader> sections = ReadSectionHeaders();
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is_update = std::ranges::any_of(sections, [](const NCASectionHeader& nca_header) {
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return nca_header.raw.header.crypto_type == NCASectionCryptoType::BKTR;
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});
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if (!ReadSections(sections, bktr_base_ivfc_offset)) {
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return;
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}
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status = Loader::ResultStatus::Success;
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}
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NCA::~NCA() = default;
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bool NCA::CheckSupportedNCA(const NCAHeader& nca_header) {
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if (nca_header.magic == Common::MakeMagic('N', 'C', 'A', '2')) {
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status = Loader::ResultStatus::ErrorNCA2;
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return false;
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}
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if (nca_header.magic == Common::MakeMagic('N', 'C', 'A', '0')) {
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status = Loader::ResultStatus::ErrorNCA0;
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return false;
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}
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return true;
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}
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bool NCA::HandlePotentialHeaderDecryption() {
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if (IsValidNCA(header)) {
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return true;
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}
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if (!CheckSupportedNCA(header)) {
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return false;
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}
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NCAHeader dec_header{};
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Core::Crypto::AESCipher<Core::Crypto::Key256> cipher(
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keys.GetKey(Core::Crypto::S256KeyType::Header), Core::Crypto::Mode::XTS);
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cipher.XTSTranscode(&header, sizeof(NCAHeader), &dec_header, 0, 0x200,
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Core::Crypto::Op::Decrypt);
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if (IsValidNCA(dec_header)) {
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header = dec_header;
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encrypted = true;
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} else {
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if (!CheckSupportedNCA(dec_header)) {
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return false;
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}
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if (keys.HasKey(Core::Crypto::S256KeyType::Header)) {
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status = Loader::ResultStatus::ErrorIncorrectHeaderKey;
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} else {
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status = Loader::ResultStatus::ErrorMissingHeaderKey;
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}
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return false;
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}
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return true;
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}
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std::vector<NCASectionHeader> NCA::ReadSectionHeaders() const {
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const std::ptrdiff_t number_sections =
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std::ranges::count_if(header.section_tables, [](const NCASectionTableEntry& entry) {
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return entry.media_offset > 0;
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});
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std::vector<NCASectionHeader> sections(number_sections);
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const auto length_sections = SECTION_HEADER_SIZE * number_sections;
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if (encrypted) {
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auto raw = file->ReadBytes(length_sections, SECTION_HEADER_OFFSET);
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Core::Crypto::AESCipher<Core::Crypto::Key256> cipher(
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keys.GetKey(Core::Crypto::S256KeyType::Header), Core::Crypto::Mode::XTS);
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cipher.XTSTranscode(raw.data(), length_sections, sections.data(), 2, SECTION_HEADER_SIZE,
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Core::Crypto::Op::Decrypt);
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} else {
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file->ReadBytes(sections.data(), length_sections, SECTION_HEADER_OFFSET);
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}
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return sections;
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}
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bool NCA::ReadSections(const std::vector<NCASectionHeader>& sections, u64 bktr_base_ivfc_offset) {
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for (std::size_t i = 0; i < sections.size(); ++i) {
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const auto& section = sections[i];
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if (section.raw.header.filesystem_type == NCASectionFilesystemType::ROMFS) {
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if (!ReadRomFSSection(section, header.section_tables[i], bktr_base_ivfc_offset)) {
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return false;
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}
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} else if (section.raw.header.filesystem_type == NCASectionFilesystemType::PFS0) {
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if (!ReadPFS0Section(section, header.section_tables[i])) {
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return false;
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}
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}
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}
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return true;
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}
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bool NCA::ReadRomFSSection(const NCASectionHeader& section, const NCASectionTableEntry& entry,
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u64 bktr_base_ivfc_offset) {
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const std::size_t base_offset = entry.media_offset * MEDIA_OFFSET_MULTIPLIER;
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ivfc_offset = section.romfs.ivfc.levels[IVFC_MAX_LEVEL - 1].offset;
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const std::size_t romfs_offset = base_offset + ivfc_offset;
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const std::size_t romfs_size = section.romfs.ivfc.levels[IVFC_MAX_LEVEL - 1].size;
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auto raw = std::make_shared<OffsetVfsFile>(file, romfs_size, romfs_offset);
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auto dec = Decrypt(section, raw, romfs_offset);
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if (dec == nullptr) {
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if (status != Loader::ResultStatus::Success)
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return false;
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if (has_rights_id)
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status = Loader::ResultStatus::ErrorIncorrectTitlekeyOrTitlekek;
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else
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status = Loader::ResultStatus::ErrorIncorrectKeyAreaKey;
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return false;
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}
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if (section.raw.header.crypto_type == NCASectionCryptoType::BKTR) {
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if (section.bktr.relocation.magic != Common::MakeMagic('B', 'K', 'T', 'R') ||
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section.bktr.subsection.magic != Common::MakeMagic('B', 'K', 'T', 'R')) {
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status = Loader::ResultStatus::ErrorBadBKTRHeader;
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return false;
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}
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if (section.bktr.relocation.offset + section.bktr.relocation.size !=
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section.bktr.subsection.offset) {
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status = Loader::ResultStatus::ErrorBKTRSubsectionNotAfterRelocation;
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return false;
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}
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const u64 size = MEDIA_OFFSET_MULTIPLIER * (entry.media_end_offset - entry.media_offset);
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if (section.bktr.subsection.offset + section.bktr.subsection.size != size) {
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status = Loader::ResultStatus::ErrorBKTRSubsectionNotAtEnd;
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return false;
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}
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const u64 offset = section.romfs.ivfc.levels[IVFC_MAX_LEVEL - 1].offset;
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RelocationBlock relocation_block{};
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if (dec->ReadObject(&relocation_block, section.bktr.relocation.offset - offset) !=
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sizeof(RelocationBlock)) {
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status = Loader::ResultStatus::ErrorBadRelocationBlock;
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return false;
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}
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SubsectionBlock subsection_block{};
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if (dec->ReadObject(&subsection_block, section.bktr.subsection.offset - offset) !=
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sizeof(RelocationBlock)) {
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status = Loader::ResultStatus::ErrorBadSubsectionBlock;
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return false;
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}
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std::vector<RelocationBucketRaw> relocation_buckets_raw(
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(section.bktr.relocation.size - sizeof(RelocationBlock)) / sizeof(RelocationBucketRaw));
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if (dec->ReadBytes(relocation_buckets_raw.data(),
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section.bktr.relocation.size - sizeof(RelocationBlock),
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section.bktr.relocation.offset + sizeof(RelocationBlock) - offset) !=
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section.bktr.relocation.size - sizeof(RelocationBlock)) {
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status = Loader::ResultStatus::ErrorBadRelocationBuckets;
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return false;
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}
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std::vector<SubsectionBucketRaw> subsection_buckets_raw(
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(section.bktr.subsection.size - sizeof(SubsectionBlock)) / sizeof(SubsectionBucketRaw));
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if (dec->ReadBytes(subsection_buckets_raw.data(),
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section.bktr.subsection.size - sizeof(SubsectionBlock),
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section.bktr.subsection.offset + sizeof(SubsectionBlock) - offset) !=
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section.bktr.subsection.size - sizeof(SubsectionBlock)) {
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status = Loader::ResultStatus::ErrorBadSubsectionBuckets;
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return false;
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}
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std::vector<RelocationBucket> relocation_buckets(relocation_buckets_raw.size());
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std::ranges::transform(relocation_buckets_raw, relocation_buckets.begin(),
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&ConvertRelocationBucketRaw);
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std::vector<SubsectionBucket> subsection_buckets(subsection_buckets_raw.size());
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std::ranges::transform(subsection_buckets_raw, subsection_buckets.begin(),
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&ConvertSubsectionBucketRaw);
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u32 ctr_low;
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std::memcpy(&ctr_low, section.raw.section_ctr.data(), sizeof(ctr_low));
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subsection_buckets.back().entries.push_back({section.bktr.relocation.offset, {0}, ctr_low});
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subsection_buckets.back().entries.push_back({size, {0}, 0});
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std::optional<Core::Crypto::Key128> key;
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if (encrypted) {
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if (has_rights_id) {
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status = Loader::ResultStatus::Success;
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key = GetTitlekey();
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if (!key) {
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status = Loader::ResultStatus::ErrorMissingTitlekey;
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return false;
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}
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} else {
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key = GetKeyAreaKey(NCASectionCryptoType::BKTR);
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if (!key) {
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status = Loader::ResultStatus::ErrorMissingKeyAreaKey;
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return false;
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}
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}
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}
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if (bktr_base_romfs == nullptr) {
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status = Loader::ResultStatus::ErrorMissingBKTRBaseRomFS;
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return false;
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}
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auto bktr = std::make_shared<BKTR>(
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bktr_base_romfs, std::make_shared<OffsetVfsFile>(file, romfs_size, base_offset),
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relocation_block, relocation_buckets, subsection_block, subsection_buckets, encrypted,
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encrypted ? *key : Core::Crypto::Key128{}, base_offset, bktr_base_ivfc_offset,
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section.raw.section_ctr);
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// BKTR applies to entire IVFC, so make an offset version to level 6
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files.push_back(std::make_shared<OffsetVfsFile>(
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bktr, romfs_size, section.romfs.ivfc.levels[IVFC_MAX_LEVEL - 1].offset));
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} else {
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files.push_back(std::move(dec));
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}
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romfs = files.back();
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return true;
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}
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bool NCA::ReadPFS0Section(const NCASectionHeader& section, const NCASectionTableEntry& entry) {
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const u64 offset = (static_cast<u64>(entry.media_offset) * MEDIA_OFFSET_MULTIPLIER) +
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section.pfs0.pfs0_header_offset;
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const u64 size = MEDIA_OFFSET_MULTIPLIER * (entry.media_end_offset - entry.media_offset);
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auto dec = Decrypt(section, std::make_shared<OffsetVfsFile>(file, size, offset), offset);
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if (dec != nullptr) {
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auto npfs = std::make_shared<PartitionFilesystem>(std::move(dec));
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if (npfs->GetStatus() == Loader::ResultStatus::Success) {
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dirs.push_back(std::move(npfs));
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if (IsDirectoryExeFS(dirs.back()))
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exefs = dirs.back();
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else if (IsDirectoryLogoPartition(dirs.back()))
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logo = dirs.back();
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} else {
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if (has_rights_id)
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status = Loader::ResultStatus::ErrorIncorrectTitlekeyOrTitlekek;
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else
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status = Loader::ResultStatus::ErrorIncorrectKeyAreaKey;
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return false;
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}
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} else {
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if (status != Loader::ResultStatus::Success)
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return false;
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if (has_rights_id)
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status = Loader::ResultStatus::ErrorIncorrectTitlekeyOrTitlekek;
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else
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status = Loader::ResultStatus::ErrorIncorrectKeyAreaKey;
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return false;
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}
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return true;
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}
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u8 NCA::GetCryptoRevision() const {
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u8 master_key_id = header.crypto_type;
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if (header.crypto_type_2 > master_key_id)
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master_key_id = header.crypto_type_2;
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if (master_key_id > 0)
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--master_key_id;
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return master_key_id;
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}
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std::optional<Core::Crypto::Key128> NCA::GetKeyAreaKey(NCASectionCryptoType type) const {
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const auto master_key_id = GetCryptoRevision();
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if (!keys.HasKey(Core::Crypto::S128KeyType::KeyArea, master_key_id, header.key_index)) {
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return std::nullopt;
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}
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std::vector<u8> key_area(header.key_area.begin(), header.key_area.end());
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Core::Crypto::AESCipher<Core::Crypto::Key128> cipher(
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keys.GetKey(Core::Crypto::S128KeyType::KeyArea, master_key_id, header.key_index),
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Core::Crypto::Mode::ECB);
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cipher.Transcode(key_area.data(), key_area.size(), key_area.data(), Core::Crypto::Op::Decrypt);
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Core::Crypto::Key128 out;
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if (type == NCASectionCryptoType::XTS) {
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std::copy(key_area.begin(), key_area.begin() + 0x10, out.begin());
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} else if (type == NCASectionCryptoType::CTR || type == NCASectionCryptoType::BKTR) {
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std::copy(key_area.begin() + 0x20, key_area.begin() + 0x30, out.begin());
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} else {
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LOG_CRITICAL(Crypto, "Called GetKeyAreaKey on invalid NCASectionCryptoType type={:02X}",
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type);
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}
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u128 out_128{};
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std::memcpy(out_128.data(), out.data(), sizeof(u128));
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LOG_TRACE(Crypto, "called with crypto_rev={:02X}, kak_index={:02X}, key={:016X}{:016X}",
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master_key_id, header.key_index, out_128[1], out_128[0]);
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return out;
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}
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std::optional<Core::Crypto::Key128> NCA::GetTitlekey() {
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const auto master_key_id = GetCryptoRevision();
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u128 rights_id{};
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memcpy(rights_id.data(), header.rights_id.data(), 16);
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if (rights_id == u128{}) {
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status = Loader::ResultStatus::ErrorInvalidRightsID;
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return std::nullopt;
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}
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auto titlekey = keys.GetKey(Core::Crypto::S128KeyType::Titlekey, rights_id[1], rights_id[0]);
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if (titlekey == Core::Crypto::Key128{}) {
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status = Loader::ResultStatus::ErrorMissingTitlekey;
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return std::nullopt;
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}
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if (!keys.HasKey(Core::Crypto::S128KeyType::Titlekek, master_key_id)) {
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status = Loader::ResultStatus::ErrorMissingTitlekek;
|
|
return std::nullopt;
|
|
}
|
|
|
|
Core::Crypto::AESCipher<Core::Crypto::Key128> cipher(
|
|
keys.GetKey(Core::Crypto::S128KeyType::Titlekek, master_key_id), Core::Crypto::Mode::ECB);
|
|
cipher.Transcode(titlekey.data(), titlekey.size(), titlekey.data(), Core::Crypto::Op::Decrypt);
|
|
|
|
return titlekey;
|
|
}
|
|
|
|
VirtualFile NCA::Decrypt(const NCASectionHeader& s_header, VirtualFile in, u64 starting_offset) {
|
|
if (!encrypted)
|
|
return in;
|
|
|
|
switch (s_header.raw.header.crypto_type) {
|
|
case NCASectionCryptoType::NONE:
|
|
LOG_TRACE(Crypto, "called with mode=NONE");
|
|
return in;
|
|
case NCASectionCryptoType::CTR:
|
|
// During normal BKTR decryption, this entire function is skipped. This is for the metadata,
|
|
// which uses the same CTR as usual.
|
|
case NCASectionCryptoType::BKTR:
|
|
LOG_TRACE(Crypto, "called with mode=CTR, starting_offset={:016X}", starting_offset);
|
|
{
|
|
std::optional<Core::Crypto::Key128> key;
|
|
if (has_rights_id) {
|
|
status = Loader::ResultStatus::Success;
|
|
key = GetTitlekey();
|
|
if (!key) {
|
|
if (status == Loader::ResultStatus::Success)
|
|
status = Loader::ResultStatus::ErrorMissingTitlekey;
|
|
return nullptr;
|
|
}
|
|
} else {
|
|
key = GetKeyAreaKey(NCASectionCryptoType::CTR);
|
|
if (!key) {
|
|
status = Loader::ResultStatus::ErrorMissingKeyAreaKey;
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
auto out = std::make_shared<Core::Crypto::CTREncryptionLayer>(std::move(in), *key,
|
|
starting_offset);
|
|
Core::Crypto::CTREncryptionLayer::IVData iv{};
|
|
for (std::size_t i = 0; i < 8; ++i) {
|
|
iv[i] = s_header.raw.section_ctr[8 - i - 1];
|
|
}
|
|
out->SetIV(iv);
|
|
return std::static_pointer_cast<VfsFile>(out);
|
|
}
|
|
case NCASectionCryptoType::XTS:
|
|
// TODO(DarkLordZach): Find a test case for XTS-encrypted NCAs
|
|
default:
|
|
LOG_ERROR(Crypto, "called with unhandled crypto type={:02X}",
|
|
s_header.raw.header.crypto_type);
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
Loader::ResultStatus NCA::GetStatus() const {
|
|
return status;
|
|
}
|
|
|
|
std::vector<VirtualFile> NCA::GetFiles() const {
|
|
if (status != Loader::ResultStatus::Success) {
|
|
return {};
|
|
}
|
|
return files;
|
|
}
|
|
|
|
std::vector<VirtualDir> NCA::GetSubdirectories() const {
|
|
if (status != Loader::ResultStatus::Success) {
|
|
return {};
|
|
}
|
|
return dirs;
|
|
}
|
|
|
|
std::string NCA::GetName() const {
|
|
return file->GetName();
|
|
}
|
|
|
|
VirtualDir NCA::GetParentDirectory() const {
|
|
return file->GetContainingDirectory();
|
|
}
|
|
|
|
NCAContentType NCA::GetType() const {
|
|
return header.content_type;
|
|
}
|
|
|
|
u64 NCA::GetTitleId() const {
|
|
if (is_update || status == Loader::ResultStatus::ErrorMissingBKTRBaseRomFS)
|
|
return header.title_id | 0x800;
|
|
return header.title_id;
|
|
}
|
|
|
|
std::array<u8, 16> NCA::GetRightsId() const {
|
|
return header.rights_id;
|
|
}
|
|
|
|
u32 NCA::GetSDKVersion() const {
|
|
return header.sdk_version;
|
|
}
|
|
|
|
bool NCA::IsUpdate() const {
|
|
return is_update;
|
|
}
|
|
|
|
VirtualFile NCA::GetRomFS() const {
|
|
return romfs;
|
|
}
|
|
|
|
VirtualDir NCA::GetExeFS() const {
|
|
return exefs;
|
|
}
|
|
|
|
VirtualFile NCA::GetBaseFile() const {
|
|
return file;
|
|
}
|
|
|
|
u64 NCA::GetBaseIVFCOffset() const {
|
|
return ivfc_offset;
|
|
}
|
|
|
|
VirtualDir NCA::GetLogoPartition() const {
|
|
return logo;
|
|
}
|
|
|
|
} // namespace FileSys
|