diff options
Diffstat (limited to 'src/core/crypto/key_manager.cpp')
| -rw-r--r-- | src/core/crypto/key_manager.cpp | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/src/core/crypto/key_manager.cpp b/src/core/crypto/key_manager.cpp index 9cb7124d2..b37b09772 100644 --- a/src/core/crypto/key_manager.cpp +++ b/src/core/crypto/key_manager.cpp @@ -262,6 +262,28 @@ void KeyManager::AttemptLoadKeyFile(const std::string& dir1, const std::string& LoadFromFile(dir2 + DIR_SEP + filename, title); } +bool KeyManager::BaseDeriveNecessary() { + const auto check_key_existence = [this](auto key_type, u64 index1 = 0, u64 index2 = 0) { + return !HasKey(key_type, index1, index2); + }; + + if (check_key_existence(S256KeyType::Header)) + return true; + + for (size_t i = 0; i < CURRENT_CRYPTO_REVISION; ++i) { + if (check_key_existence(S128KeyType::Master, i) || + check_key_existence(S128KeyType::KeyArea, i, + static_cast<u64>(KeyAreaKeyType::Application)) || + check_key_existence(S128KeyType::KeyArea, i, static_cast<u64>(KeyAreaKeyType::Ocean)) || + check_key_existence(S128KeyType::KeyArea, i, + static_cast<u64>(KeyAreaKeyType::System)) || + check_key_existence(S128KeyType::Titlekek, i)) + return true; + } + + return false; +} + bool KeyManager::HasKey(S128KeyType id, u64 field1, u64 field2) const { return s128_keys.find({id, field1, field2}) != s128_keys.end(); } @@ -412,6 +434,193 @@ void KeyManager::DeriveSDSeedLazy() { SetKey(S128KeyType::SDSeed, res.get()); } +static Key128 CalculateCMAC(const u8* source, size_t size, Key128 key) { + Key128 out{}; + + mbedtls_cipher_cmac(mbedtls_cipher_info_from_type(MBEDTLS_CIPHER_AES_128_ECB), key.data(), 0x80, + source, size, out.data()); + return out; +} + +void KeyManager::DeriveBase() { + if (!BaseDeriveNecessary()) + return; + + if (!HasKey(S128KeyType::SecureBoot) || !HasKey(S128KeyType::TSEC)) + return; + + const auto has_bis = [this](u64 id) { + return HasKey(S128KeyType::BIS, id, static_cast<u64>(BISKeyType::Crypto)) && + HasKey(S128KeyType::BIS, id, static_cast<u64>(BISKeyType::Tweak)); + }; + + const auto copy_bis = [this](u64 id_from, u64 id_to) { + SetKey(S128KeyType::BIS, + GetKey(S128KeyType::BIS, id_from, static_cast<u64>(BISKeyType::Crypto)), id_to, + static_cast<u64>(BISKeyType::Crypto)); + + SetKey(S128KeyType::BIS, + GetKey(S128KeyType::BIS, id_from, static_cast<u64>(BISKeyType::Tweak)), id_to, + static_cast<u64>(BISKeyType::Tweak)); + }; + + if (has_bis(2) && !has_bis(3)) + copy_bis(2, 3); + else if (has_bis(3) && !has_bis(2)) + copy_bis(3, 2); + + std::bitset<32> revisions{}; + revisions.set(); + for (size_t i = 0; i < 32; ++i) { + if (!HasKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::Keyblob), i) || + encrypted_keyblobs[i] == std::array<u8, 0xB0>{}) + revisions.reset(i); + } + + if (!revisions.any()) + return; + + const auto sbk = GetKey(S128KeyType::SecureBoot); + const auto tsec = GetKey(S128KeyType::TSEC); + const auto master_source = GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::Master)); + const auto kek_generation_source = + GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKekGeneration)); + const auto key_generation_source = + GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKeyGeneration)); + + for (size_t i = 0; i < 32; ++i) { + if (!revisions[i]) + continue; + + // Derive keyblob key + const auto key = DeriveKeyblobKey( + sbk, tsec, GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::Keyblob), i)); + + SetKey(S128KeyType::Keyblob, key, i); + + // Derive keyblob MAC key + if (!HasKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::KeyblobMAC))) + continue; + + const auto mac_source = + GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::KeyblobMAC)); + + AESCipher<Key128> mac_cipher(key, Mode::ECB); + Key128 mac_key{}; + mac_cipher.Transcode(mac_source.data(), mac_key.size(), mac_key.data(), Op::Decrypt); + + SetKey(S128KeyType::KeyblobMAC, mac_key, i); + + Key128 cmac = CalculateCMAC(encrypted_keyblobs[i].data() + 0x10, 0xA0, mac_key); + if (std::memcmp(cmac.data(), encrypted_keyblobs[i].data(), cmac.size()) != 0) + continue; + + // Decrypt keyblob + bool has_keyblob = keyblobs[i] != std::array<u8, 0x90>{}; + + AESCipher<Key128> cipher(key, Mode::CTR); + cipher.SetIV(std::vector<u8>(encrypted_keyblobs[i].data() + 0x10, + encrypted_keyblobs[i].data() + 0x20)); + cipher.Transcode(encrypted_keyblobs[i].data() + 0x20, keyblobs[i].size(), + keyblobs[i].data(), Op::Decrypt); + + if (!has_keyblob) { + WriteKeyToFile<0x90>(KeyCategory::Console, fmt::format("keyblob_{:02X}", i), + keyblobs[i]); + } + + Key128 package1{}; + std::memcpy(package1.data(), keyblobs[i].data() + 0x80, sizeof(Key128)); + SetKey(S128KeyType::Package1, package1, i); + + // Derive master key + if (HasKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::Master))) { + Key128 master_root{}; + std::memcpy(master_root.data(), keyblobs[i].data(), sizeof(Key128)); + + AESCipher<Key128> master_cipher(master_root, Mode::ECB); + + Key128 master{}; + master_cipher.Transcode(master_source.data(), master_source.size(), master.data(), + Op::Decrypt); + SetKey(S128KeyType::Master, master, i); + } + } + + revisions.set(); + for (size_t i = 0; i < 32; ++i) { + if (!HasKey(S128KeyType::Master, i)) + revisions.reset(i); + } + + if (!revisions.any()) + return; + + for (size_t i = 0; i < 32; ++i) { + if (!revisions[i]) + continue; + + // Derive general purpose keys + if (HasKey(S128KeyType::Master, i)) { + for (auto kak_type : + {KeyAreaKeyType::Application, KeyAreaKeyType::Ocean, KeyAreaKeyType::System}) { + if (HasKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::KeyAreaKey), + static_cast<u64>(kak_type))) { + const auto source = + GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::KeyAreaKey), + static_cast<u64>(kak_type)); + const auto kek = + GenerateKeyEncryptionKey(source, GetKey(S128KeyType::Master, i), + kek_generation_source, key_generation_source); + SetKey(S128KeyType::KeyArea, kek, i, static_cast<u64>(kak_type)); + } + } + + AESCipher<Key128> master_cipher(GetKey(S128KeyType::Master, i), Mode::ECB); + for (auto key_type : {SourceKeyType::Titlekek, SourceKeyType::Package2}) { + if (HasKey(S128KeyType::Source, static_cast<u64>(key_type))) { + Key128 key{}; + master_cipher.Transcode( + GetKey(S128KeyType::Source, static_cast<u64>(key_type)).data(), key.size(), + key.data(), Op::Decrypt); + SetKey(key_type == SourceKeyType::Titlekek ? S128KeyType::Titlekek + : S128KeyType::Package2, + key, i); + } + } + } + } + + if (HasKey(S128KeyType::Master, 0) && + HasKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKeyGeneration)) && + HasKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKekGeneration)) && + HasKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::HeaderKek)) && + HasKey(S256KeyType::HeaderSource)) { + const auto header_kek = GenerateKeyEncryptionKey( + GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::HeaderKek)), + GetKey(S128KeyType::Master, 0), + GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKekGeneration)), + GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKeyGeneration))); + SetKey(S128KeyType::HeaderKek, header_kek); + + AESCipher<Key128> header_cipher(header_kek, Mode::ECB); + Key256 out = GetKey(S256KeyType::HeaderSource); + header_cipher.Transcode(out.data(), out.size(), out.data(), Op::Decrypt); + SetKey(S256KeyType::Header, out); + } +} +void KeyManager::SetKeyWrapped(S128KeyType id, Key128 key, u64 field1, u64 field2) { + if (key == Key128{}) + return; + SetKey(id, key, field1, field2); +} + +void KeyManager::SetKeyWrapped(S256KeyType id, Key256 key, u64 field1, u64 field2) { + if (key == Key256{}) + return; + SetKey(id, key, field1, field2); +} + const boost::container::flat_map<std::string, KeyIndex<S128KeyType>> KeyManager::s128_file_id = { {"eticket_rsa_kek", {S128KeyType::ETicketRSAKek, 0, 0}}, {"eticket_rsa_kek_source", |