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Diffstat (limited to '')
-rw-r--r-- | src/core/file_sys/fssystem/fssystem_crypto_configuration.cpp | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/src/core/file_sys/fssystem/fssystem_crypto_configuration.cpp b/src/core/file_sys/fssystem/fssystem_crypto_configuration.cpp new file mode 100644 index 000000000..7b89d4512 --- /dev/null +++ b/src/core/file_sys/fssystem/fssystem_crypto_configuration.cpp @@ -0,0 +1,57 @@ +// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project +// SPDX-License-Identifier: GPL-2.0-or-later + +#include "core/crypto/aes_util.h" +#include "core/crypto/key_manager.h" +#include "core/file_sys/fssystem/fssystem_crypto_configuration.h" + +namespace FileSys { + +namespace { + +void GenerateKey(void* dst_key, size_t dst_key_size, const void* src_key, size_t src_key_size, + s32 key_type) { + if (key_type == static_cast<s32>(KeyType::ZeroKey)) { + std::memset(dst_key, 0, dst_key_size); + return; + } + + if (key_type == static_cast<s32>(KeyType::InvalidKey) || + key_type < static_cast<s32>(KeyType::ZeroKey) || + key_type >= static_cast<s32>(KeyType::NcaExternalKey)) { + std::memset(dst_key, 0xFF, dst_key_size); + return; + } + + const auto& instance = Core::Crypto::KeyManager::Instance(); + + if (key_type == static_cast<s32>(KeyType::NcaHeaderKey1) || + key_type == static_cast<s32>(KeyType::NcaHeaderKey2)) { + const s32 key_index = static_cast<s32>(KeyType::NcaHeaderKey2) == key_type; + const auto key = instance.GetKey(Core::Crypto::S256KeyType::Header); + std::memcpy(dst_key, key.data() + key_index * 0x10, std::min(dst_key_size, key.size() / 2)); + return; + } + + const s32 key_generation = + std::max(key_type / NcaCryptoConfiguration::KeyAreaEncryptionKeyIndexCount, 1) - 1; + const s32 key_index = key_type % NcaCryptoConfiguration::KeyAreaEncryptionKeyIndexCount; + + Core::Crypto::AESCipher<Core::Crypto::Key128> cipher( + instance.GetKey(Core::Crypto::S128KeyType::KeyArea, key_generation, key_index), + Core::Crypto::Mode::ECB); + cipher.Transcode(reinterpret_cast<const u8*>(src_key), src_key_size, + reinterpret_cast<u8*>(dst_key), Core::Crypto::Op::Decrypt); +} + +} // namespace + +const NcaCryptoConfiguration& GetCryptoConfiguration() { + static const NcaCryptoConfiguration configuration = { + .generate_key = GenerateKey, + }; + + return configuration; +} + +} // namespace FileSys |