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content_archive: Add support for titlekey cryptography
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parent
2b06301dbf
commit
2cc962e171
2 changed files with 39 additions and 7 deletions
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@ -76,12 +76,17 @@ bool IsValidNCA(const NCAHeader& header) {
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return header.magic == Common::MakeMagic('N', 'C', 'A', '3');
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}
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boost::optional<Core::Crypto::Key128> NCA::GetKeyAreaKey(NCASectionCryptoType type) const {
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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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boost::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 boost::none;
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@ -108,33 +113,58 @@ boost::optional<Core::Crypto::Key128> NCA::GetKeyAreaKey(NCASectionCryptoType ty
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return out;
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}
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VirtualFile NCA::Decrypt(NCASectionHeader header, VirtualFile in, u64 starting_offset) const {
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boost::optional<Core::Crypto::Key128> NCA::GetTitlekey() const {
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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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return boost::none;
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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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return boost::none;
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Core::Crypto::AESCipher<Core::Crypto::Key128> cipher(
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keys.GetKey(Core::Crypto::S128KeyType::Titlekek, master_key_id), Core::Crypto::Mode::ECB);
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cipher.Transcode(titlekey.data(), titlekey.size(), titlekey.data(), Core::Crypto::Op::Decrypt);
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return titlekey;
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}
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VirtualFile NCA::Decrypt(NCASectionHeader s_header, VirtualFile in, u64 starting_offset) const {
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if (!encrypted)
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return in;
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switch (header.raw.header.crypto_type) {
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switch (s_header.raw.header.crypto_type) {
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case NCASectionCryptoType::NONE:
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LOG_DEBUG(Crypto, "called with mode=NONE");
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return in;
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case NCASectionCryptoType::CTR:
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LOG_DEBUG(Crypto, "called with mode=CTR, starting_offset={:016X}", starting_offset);
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{
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const auto key = GetKeyAreaKey(NCASectionCryptoType::CTR);
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boost::optional<Core::Crypto::Key128> key = boost::none;
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if (std::find_if_not(header.rights_id.begin(), header.rights_id.end(),
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[](char c) { return c == 0; }) == header.rights_id.end()) {
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key = GetKeyAreaKey(NCASectionCryptoType::CTR);
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} else {
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key = GetTitlekey();
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}
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if (key == boost::none)
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return nullptr;
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auto out = std::make_shared<Core::Crypto::CTREncryptionLayer>(
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std::move(in), key.value(), starting_offset);
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std::vector<u8> iv(16);
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for (u8 i = 0; i < 8; ++i)
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iv[i] = header.raw.section_ctr[0x8 - i - 1];
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iv[i] = s_header.raw.section_ctr[0x8 - i - 1];
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out->SetIV(iv);
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return std::static_pointer_cast<VfsFile>(out);
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}
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case NCASectionCryptoType::XTS:
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// TODO(DarkLordZach): Implement XTSEncryptionLayer and title key encryption.
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// TODO(DarkLordZach): Implement XTSEncryptionLayer.
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default:
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LOG_ERROR(Crypto, "called with unhandled crypto type={:02X}",
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static_cast<u8>(header.raw.header.crypto_type));
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static_cast<u8>(s_header.raw.header.crypto_type));
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return nullptr;
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}
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}
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@ -95,7 +95,9 @@ protected:
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bool ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) override;
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private:
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u8 GetCryptoRevision() const;
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boost::optional<Core::Crypto::Key128> GetKeyAreaKey(NCASectionCryptoType type) const;
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boost::optional<Core::Crypto::Key128> GetTitlekey() const;
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VirtualFile Decrypt(NCASectionHeader header, VirtualFile in, u64 starting_offset) const;
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std::vector<VirtualDir> dirs;
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