1 files changed, 421 insertions, 134 deletions

diff --git a/src/core/hle/service/nfp/nfp.cpp b/src/core/hle/service/nfp/nfp.cpp
index 6c5b41dd1..e0ed3f771 100644
--- a/src/core/hle/service/nfp/nfp.cpp
+++ b/src/core/hle/service/nfp/nfp.cpp
@@ -4,7 +4,10 @@
 #include <array>
 #include <atomic>
 
+#include "common/fs/file.h"
+#include "common/fs/path_util.h"
 #include "common/logging/log.h"
+#include "common/string_util.h"
 #include "core/core.h"
 #include "core/hid/emulated_controller.h"
 #include "core/hid/hid_core.h"
@@ -12,6 +15,7 @@
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/k_event.h"
 #include "core/hle/service/mii/mii_manager.h"
+#include "core/hle/service/nfp/amiibo_crypto.h"
 #include "core/hle/service/nfp/nfp.h"
 #include "core/hle/service/nfp/nfp_user.h"
 
@@ -19,12 +23,14 @@ namespace Service::NFP {
 namespace ErrCodes {
 constexpr Result DeviceNotFound(ErrorModule::NFP, 64);
 constexpr Result WrongDeviceState(ErrorModule::NFP, 73);
+constexpr Result NfcDisabled(ErrorModule::NFP, 80);
+constexpr Result WriteAmiiboFailed(ErrorModule::NFP, 88);
+constexpr Result TagRemoved(ErrorModule::NFP, 97);
 constexpr Result ApplicationAreaIsNotInitialized(ErrorModule::NFP, 128);
+constexpr Result WrongApplicationAreaId(ErrorModule::NFP, 152);
 constexpr Result ApplicationAreaExist(ErrorModule::NFP, 168);
 } // namespace ErrCodes
 
-constexpr u32 ApplicationAreaSize = 0xD8;
-
 IUser::IUser(Module::Interface& nfp_interface_, Core::System& system_)
     : ServiceFramework{system_, "NFP::IUser"}, service_context{system_, service_name},
       nfp_interface{nfp_interface_} {
@@ -39,7 +45,7 @@ IUser::IUser(Module::Interface& nfp_interface_, Core::System& system_)
         {7, &IUser::OpenApplicationArea, "OpenApplicationArea"},
         {8, &IUser::GetApplicationArea, "GetApplicationArea"},
         {9, &IUser::SetApplicationArea, "SetApplicationArea"},
-        {10, nullptr, "Flush"},
+        {10, &IUser::Flush, "Flush"},
         {11, nullptr, "Restore"},
         {12, &IUser::CreateApplicationArea, "CreateApplicationArea"},
         {13, &IUser::GetTagInfo, "GetTagInfo"},
@@ -53,7 +59,7 @@ IUser::IUser(Module::Interface& nfp_interface_, Core::System& system_)
         {21, &IUser::GetNpadId, "GetNpadId"},
         {22, &IUser::GetApplicationAreaSize, "GetApplicationAreaSize"},
         {23, &IUser::AttachAvailabilityChangeEvent, "AttachAvailabilityChangeEvent"},
-        {24, nullptr, "RecreateApplicationArea"},
+        {24, &IUser::RecreateApplicationArea, "RecreateApplicationArea"},
     };
     RegisterHandlers(functions);
 
@@ -87,11 +93,23 @@ void IUser::Finalize(Kernel::HLERequestContext& ctx) {
 void IUser::ListDevices(Kernel::HLERequestContext& ctx) {
     LOG_INFO(Service_NFP, "called");
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     std::vector<u64> devices;
 
     // TODO(german77): Loop through all interfaces
     devices.push_back(nfp_interface.GetHandle());
 
+    if (devices.size() == 0) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::DeviceNotFound);
+        return;
+    }
+
     ctx.WriteBuffer(devices);
 
     IPC::ResponseBuilder rb{ctx, 3};
@@ -105,6 +123,12 @@ void IUser::StartDetection(Kernel::HLERequestContext& ctx) {
     const auto nfp_protocol{rp.Pop<s32>()};
     LOG_INFO(Service_NFP, "called, device_handle={}, nfp_protocol={}", device_handle, nfp_protocol);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.StartDetection(nfp_protocol);
@@ -124,6 +148,12 @@ void IUser::StopDetection(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.StopDetection();
@@ -146,6 +176,12 @@ void IUser::Mount(Kernel::HLERequestContext& ctx) {
     LOG_INFO(Service_NFP, "called, device_handle={}, model_type={}, mount_target={}", device_handle,
              model_type, mount_target);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.Mount();
@@ -165,6 +201,12 @@ void IUser::Unmount(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.Unmount();
@@ -186,6 +228,12 @@ void IUser::OpenApplicationArea(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service_NFP, "(STUBBED) called, device_handle={}, access_id={}", device_handle,
                 access_id);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.OpenApplicationArea(access_id);
@@ -205,9 +253,15 @@ void IUser::GetApplicationArea(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
-        std::vector<u8> data{};
+        ApplicationArea data{};
         const auto result = nfp_interface.GetApplicationArea(data);
         ctx.WriteBuffer(data);
         IPC::ResponseBuilder rb{ctx, 3};
@@ -229,6 +283,12 @@ void IUser::SetApplicationArea(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service_NFP, "(STUBBED) called, device_handle={}, data_size={}", device_handle,
                 data.size());
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.SetApplicationArea(data);
@@ -243,6 +303,31 @@ void IUser::SetApplicationArea(Kernel::HLERequestContext& ctx) {
     rb.Push(ErrCodes::DeviceNotFound);
 }
 
+void IUser::Flush(Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const auto device_handle{rp.Pop<u64>()};
+    LOG_WARNING(Service_NFP, "(STUBBED) called, device_handle={}", device_handle);
+
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
+    // TODO(german77): Loop through all interfaces
+    if (device_handle == nfp_interface.GetHandle()) {
+        const auto result = nfp_interface.Flush();
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(result);
+        return;
+    }
+
+    LOG_ERROR(Service_NFP, "Handle not found, device_handle={}", device_handle);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ErrCodes::DeviceNotFound);
+}
+
 void IUser::CreateApplicationArea(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     const auto device_handle{rp.Pop<u64>()};
@@ -251,6 +336,12 @@ void IUser::CreateApplicationArea(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service_NFP, "(STUBBED) called, device_handle={}, data_size={}, access_id={}",
                 device_handle, access_id, data.size());
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.CreateApplicationArea(access_id, data);
@@ -270,6 +361,12 @@ void IUser::GetTagInfo(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         TagInfo tag_info{};
@@ -291,6 +388,12 @@ void IUser::GetRegisterInfo(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         RegisterInfo register_info{};
@@ -312,6 +415,12 @@ void IUser::GetCommonInfo(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         CommonInfo common_info{};
@@ -333,6 +442,12 @@ void IUser::GetModelInfo(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         ModelInfo model_info{};
@@ -354,6 +469,12 @@ void IUser::AttachActivateEvent(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_DEBUG(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         IPC::ResponseBuilder rb{ctx, 2, 1};
@@ -373,6 +494,12 @@ void IUser::AttachDeactivateEvent(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_DEBUG(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         IPC::ResponseBuilder rb{ctx, 2, 1};
@@ -419,6 +546,12 @@ void IUser::GetNpadId(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_DEBUG(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         IPC::ResponseBuilder rb{ctx, 3};
@@ -442,7 +575,7 @@ void IUser::GetApplicationAreaSize(Kernel::HLERequestContext& ctx) {
     if (device_handle == nfp_interface.GetHandle()) {
         IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(ResultSuccess);
-        rb.Push(ApplicationAreaSize);
+        rb.Push(sizeof(ApplicationArea));
         return;
     }
 
@@ -455,11 +588,45 @@ void IUser::GetApplicationAreaSize(Kernel::HLERequestContext& ctx) {
 void IUser::AttachAvailabilityChangeEvent(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_NFP, "(STUBBED) called");
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     IPC::ResponseBuilder rb{ctx, 2, 1};
     rb.Push(ResultSuccess);
     rb.PushCopyObjects(availability_change_event->GetReadableEvent());
 }
 
+void IUser::RecreateApplicationArea(Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const auto device_handle{rp.Pop<u64>()};
+    const auto access_id{rp.Pop<u32>()};
+    const auto data{ctx.ReadBuffer()};
+    LOG_WARNING(Service_NFP, "(STUBBED) called, device_handle={}, data_size={}, access_id={}",
+                device_handle, access_id, data.size());
+
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
+    // TODO(german77): Loop through all interfaces
+    if (device_handle == nfp_interface.GetHandle()) {
+        const auto result = nfp_interface.RecreateApplicationArea(access_id, data);
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(result);
+        return;
+    }
+
+    LOG_ERROR(Service_NFP, "Handle not found, device_handle={}", device_handle);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ErrCodes::DeviceNotFound);
+}
+
 Module::Interface::Interface(std::shared_ptr<Module> module_, Core::System& system_,
                              const char* name)
     : ServiceFramework{system_, name}, module{std::move(module_)},
@@ -478,36 +645,42 @@ void Module::Interface::CreateUserInterface(Kernel::HLERequestContext& ctx) {
     rb.PushIpcInterface<IUser>(*this, system);
 }
 
-bool Module::Interface::LoadAmiibo(const std::vector<u8>& buffer) {
-    if (device_state != DeviceState::SearchingForTag) {
-        LOG_ERROR(Service_NFP, "Game is not looking for amiibos, current state {}", device_state);
-        return false;
-    }
-
-    constexpr auto tag_size = sizeof(NTAG215File);
+bool Module::Interface::LoadAmiiboFile(const std::string& filename) {
     constexpr auto tag_size_without_password = sizeof(NTAG215File) - sizeof(NTAG215Password);
+    const Common::FS::IOFile amiibo_file{filename, Common::FS::FileAccessMode::Read,
+                                         Common::FS::FileType::BinaryFile};
 
-    std::vector<u8> amiibo_buffer = buffer;
+    if (!amiibo_file.IsOpen()) {
+        LOG_ERROR(Service_NFP, "Amiibo is already on use");
+        return false;
+    }
 
-    if (amiibo_buffer.size() < tag_size_without_password) {
-        LOG_ERROR(Service_NFP, "Wrong file size {}", buffer.size());
+    // Workaround for files with missing password data
+    std::array<u8, sizeof(EncryptedNTAG215File)> buffer{};
+    if (amiibo_file.Read(buffer) < tag_size_without_password) {
+        LOG_ERROR(Service_NFP, "Failed to read amiibo file");
         return false;
     }
+    memcpy(&encrypted_tag_data, buffer.data(), sizeof(EncryptedNTAG215File));
 
-    // Ensure it has the correct size
-    if (amiibo_buffer.size() != tag_size) {
-        amiibo_buffer.resize(tag_size, 0);
+    if (!AmiiboCrypto::IsAmiiboValid(encrypted_tag_data)) {
+        LOG_INFO(Service_NFP, "Invalid amiibo");
+        return false;
     }
 
-    LOG_INFO(Service_NFP, "Amiibo detected");
-    std::memcpy(&tag_data, buffer.data(), tag_size);
+    file_path = filename;
+    return true;
+}
 
-    if (!IsAmiiboValid()) {
+bool Module::Interface::LoadAmiibo(const std::string& filename) {
+    if (device_state != DeviceState::SearchingForTag) {
+        LOG_ERROR(Service_NFP, "Game is not looking for amiibos, current state {}", device_state);
         return false;
     }
 
-    // This value can't be dumped from a tag. Generate it
-    tag_data.password.PWD = GetTagPassword(tag_data.uuid);
+    if (!LoadAmiiboFile(filename)) {
+        return false;
+    }
 
     device_state = DeviceState::TagFound;
     activate_event->GetWritableEvent().Signal();
@@ -517,55 +690,13 @@ bool Module::Interface::LoadAmiibo(const std::vector<u8>& buffer) {
 void Module::Interface::CloseAmiibo() {
     LOG_INFO(Service_NFP, "Remove amiibo");
     device_state = DeviceState::TagRemoved;
+    is_data_decoded = false;
     is_application_area_initialized = false;
-    application_area_id = 0;
-    application_area_data.clear();
+    encrypted_tag_data = {};
+    tag_data = {};
     deactivate_event->GetWritableEvent().Signal();
 }
 
-bool Module::Interface::IsAmiiboValid() const {
-    const auto& amiibo_data = tag_data.user_memory;
-    LOG_DEBUG(Service_NFP, "uuid_lock=0x{0:x}", tag_data.lock_bytes);
-    LOG_DEBUG(Service_NFP, "compability_container=0x{0:x}", tag_data.compability_container);
-    LOG_DEBUG(Service_NFP, "crypto_init=0x{0:x}", amiibo_data.crypto_init);
-    LOG_DEBUG(Service_NFP, "write_count={}", amiibo_data.write_count);
-
-    LOG_DEBUG(Service_NFP, "character_id=0x{0:x}", amiibo_data.model_info.character_id);
-    LOG_DEBUG(Service_NFP, "character_variant={}", amiibo_data.model_info.character_variant);
-    LOG_DEBUG(Service_NFP, "amiibo_type={}", amiibo_data.model_info.amiibo_type);
-    LOG_DEBUG(Service_NFP, "model_number=0x{0:x}", amiibo_data.model_info.model_number);
-    LOG_DEBUG(Service_NFP, "series={}", amiibo_data.model_info.series);
-    LOG_DEBUG(Service_NFP, "fixed_value=0x{0:x}", amiibo_data.model_info.fixed);
-
-    LOG_DEBUG(Service_NFP, "tag_dynamic_lock=0x{0:x}", tag_data.dynamic_lock);
-    LOG_DEBUG(Service_NFP, "tag_CFG0=0x{0:x}", tag_data.CFG0);
-    LOG_DEBUG(Service_NFP, "tag_CFG1=0x{0:x}", tag_data.CFG1);
-
-    // Check against all know constants on an amiibo binary
-    if (tag_data.lock_bytes != 0xE00F) {
-        return false;
-    }
-    if (tag_data.compability_container != 0xEEFF10F1U) {
-        return false;
-    }
-    if ((amiibo_data.crypto_init & 0xFF) != 0xA5) {
-        return false;
-    }
-    if (amiibo_data.model_info.fixed != 0x02) {
-        return false;
-    }
-    if ((tag_data.dynamic_lock & 0xFFFFFF) != 0x0F0001) {
-        return false;
-    }
-    if (tag_data.CFG0 != 0x04000000U) {
-        return false;
-    }
-    if (tag_data.CFG1 != 0x5F) {
-        return false;
-    }
-    return true;
-}
-
 Kernel::KReadableEvent& Module::Interface::GetActivateEvent() const {
     return activate_event->GetReadableEvent();
 }
@@ -576,13 +707,20 @@ Kernel::KReadableEvent& Module::Interface::GetDeactivateEvent() const {
 
 void Module::Interface::Initialize() {
     device_state = DeviceState::Initialized;
+    is_data_decoded = false;
+    is_application_area_initialized = false;
+    encrypted_tag_data = {};
+    tag_data = {};
 }
 
 void Module::Interface::Finalize() {
+    if (device_state == DeviceState::TagMounted) {
+        Unmount();
+    }
+    if (device_state == DeviceState::SearchingForTag || device_state == DeviceState::TagRemoved) {
+        StopDetection();
+    }
     device_state = DeviceState::Unaviable;
-    is_application_area_initialized = false;
-    application_area_id = 0;
-    application_area_data.clear();
 }
 
 Result Module::Interface::StartDetection(s32 protocol_) {
@@ -618,42 +756,102 @@ Result Module::Interface::StopDetection() {
     return ErrCodes::WrongDeviceState;
 }
 
-Result Module::Interface::Mount() {
-    if (device_state == DeviceState::TagFound) {
-        device_state = DeviceState::TagMounted;
+Result Module::Interface::Flush() {
+    // Ignore write command if we can't encrypt the data
+    if (!is_data_decoded) {
         return ResultSuccess;
     }
 
-    LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
-    return ErrCodes::WrongDeviceState;
+    constexpr auto tag_size_without_password = sizeof(NTAG215File) - sizeof(NTAG215Password);
+    EncryptedNTAG215File tmp_encrypted_tag_data{};
+    const Common::FS::IOFile amiibo_file{file_path, Common::FS::FileAccessMode::ReadWrite,
+                                         Common::FS::FileType::BinaryFile};
+
+    if (!amiibo_file.IsOpen()) {
+        LOG_ERROR(Core, "Amiibo is already on use");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+
+    // Workaround for files with missing password data
+    std::array<u8, sizeof(EncryptedNTAG215File)> buffer{};
+    if (amiibo_file.Read(buffer) < tag_size_without_password) {
+        LOG_ERROR(Core, "Failed to read amiibo file");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+    memcpy(&tmp_encrypted_tag_data, buffer.data(), sizeof(EncryptedNTAG215File));
+
+    if (!AmiiboCrypto::IsAmiiboValid(tmp_encrypted_tag_data)) {
+        LOG_INFO(Service_NFP, "Invalid amiibo");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+
+    bool is_uuid_equal = memcmp(tmp_encrypted_tag_data.uuid.data(), tag_data.uuid.data(), 8) == 0;
+    bool is_character_equal = tmp_encrypted_tag_data.user_memory.model_info.character_id ==
+                              tag_data.model_info.character_id;
+    if (!is_uuid_equal || !is_character_equal) {
+        LOG_ERROR(Service_NFP, "Not the same amiibo");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+
+    if (!AmiiboCrypto::EncodeAmiibo(tag_data, encrypted_tag_data)) {
+        LOG_ERROR(Service_NFP, "Failed to encode data");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+
+    // Return to the start of the file
+    if (!amiibo_file.Seek(0)) {
+        LOG_ERROR(Service_NFP, "Error writting to file");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+
+    if (!amiibo_file.Write(encrypted_tag_data)) {
+        LOG_ERROR(Service_NFP, "Error writting to file");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+
+    return ResultSuccess;
+}
+
+Result Module::Interface::Mount() {
+    if (device_state != DeviceState::TagFound) {
+        LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
+        return ErrCodes::WrongDeviceState;
+    }
+
+    is_data_decoded = AmiiboCrypto::DecodeAmiibo(encrypted_tag_data, tag_data);
+    LOG_INFO(Service_NFP, "Is amiibo decoded {}", is_data_decoded);
+
+    is_application_area_initialized = false;
+    device_state = DeviceState::TagMounted;
+    return ResultSuccess;
 }
 
 Result Module::Interface::Unmount() {
-    if (device_state == DeviceState::TagMounted) {
-        is_application_area_initialized = false;
-        application_area_id = 0;
-        application_area_data.clear();
-        device_state = DeviceState::TagFound;
-        return ResultSuccess;
+    if (device_state != DeviceState::TagMounted) {
+        LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
+        return ErrCodes::WrongDeviceState;
     }
 
-    LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
-    return ErrCodes::WrongDeviceState;
+    is_data_decoded = false;
+    is_application_area_initialized = false;
+    device_state = DeviceState::TagFound;
+    return ResultSuccess;
 }
 
 Result Module::Interface::GetTagInfo(TagInfo& tag_info) const {
-    if (device_state == DeviceState::TagFound || device_state == DeviceState::TagMounted) {
-        tag_info = {
-            .uuid = tag_data.uuid,
-            .uuid_length = static_cast<u8>(tag_data.uuid.size()),
-            .protocol = protocol,
-            .tag_type = static_cast<u32>(tag_data.user_memory.model_info.amiibo_type),
-        };
-        return ResultSuccess;
+    if (device_state != DeviceState::TagFound && device_state != DeviceState::TagMounted) {
+        LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
+        return ErrCodes::WrongDeviceState;
     }
 
-    LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
-    return ErrCodes::WrongDeviceState;
+    tag_info = {
+        .uuid = encrypted_tag_data.uuid,
+        .uuid_length = static_cast<u8>(encrypted_tag_data.uuid.size()),
+        .protocol = protocol,
+        .tag_type = static_cast<u32>(encrypted_tag_data.user_memory.model_info.amiibo_type),
+    };
+
+    return ResultSuccess;
 }
 
 Result Module::Interface::GetCommonInfo(CommonInfo& common_info) const {
@@ -662,14 +860,28 @@ Result Module::Interface::GetCommonInfo(CommonInfo& common_info) const {
         return ErrCodes::WrongDeviceState;
     }
 
-    // Read this data from the amiibo save file
+    if (is_data_decoded && tag_data.settings.settings.amiibo_initialized != 0) {
+        const auto& settings = tag_data.settings;
+        // TODO: Validate this data
+        common_info = {
+            .last_write_year = settings.write_date.GetYear(),
+            .last_write_month = settings.write_date.GetMonth(),
+            .last_write_day = settings.write_date.GetDay(),
+            .write_counter = settings.crc_counter,
+            .version = 1,
+            .application_area_size = sizeof(ApplicationArea),
+        };
+        return ResultSuccess;
+    }
+
+    // Generate a generic answer
     common_info = {
         .last_write_year = 2022,
         .last_write_month = 2,
         .last_write_day = 7,
-        .write_counter = tag_data.user_memory.write_count,
+        .write_counter = 0,
         .version = 1,
-        .application_area_size = ApplicationAreaSize,
+        .application_area_size = sizeof(ApplicationArea),
     };
     return ResultSuccess;
 }
@@ -680,26 +892,53 @@ Result Module::Interface::GetModelInfo(ModelInfo& model_info) const {
         return ErrCodes::WrongDeviceState;
     }
 
-    model_info = tag_data.user_memory.model_info;
+    const auto& model_info_data = encrypted_tag_data.user_memory.model_info;
+    model_info = {
+        .character_id = model_info_data.character_id,
+        .character_variant = model_info_data.character_variant,
+        .amiibo_type = model_info_data.amiibo_type,
+        .model_number = model_info_data.model_number,
+        .series = model_info_data.series,
+        .constant_value = model_info_data.constant_value,
+    };
     return ResultSuccess;
 }
 
 Result Module::Interface::GetRegisterInfo(RegisterInfo& register_info) const {
     if (device_state != DeviceState::TagMounted) {
         LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
+        if (device_state == DeviceState::TagRemoved) {
+            return ErrCodes::TagRemoved;
+        }
         return ErrCodes::WrongDeviceState;
     }
 
     Service::Mii::MiiManager manager;
 
-    // Read this data from the amiibo save file
+    if (is_data_decoded && tag_data.settings.settings.amiibo_initialized != 0) {
+        const auto& settings = tag_data.settings;
+
+        // TODO: Validate this data
+        register_info = {
+            .mii_char_info = manager.ConvertV3ToCharInfo(tag_data.owner_mii),
+            .first_write_year = settings.init_date.GetYear(),
+            .first_write_month = settings.init_date.GetMonth(),
+            .first_write_day = settings.init_date.GetDay(),
+            .amiibo_name = GetAmiiboName(settings),
+            .font_region = {},
+        };
+
+        return ResultSuccess;
+    }
+
+    // Generate a generic answer
     register_info = {
         .mii_char_info = manager.BuildDefault(0),
         .first_write_year = 2022,
         .first_write_month = 2,
         .first_write_day = 7,
         .amiibo_name = {'Y', 'u', 'z', 'u', 'A', 'm', 'i', 'i', 'b', 'o', 0},
-        .unknown = {},
+        .font_region = {},
     };
     return ResultSuccess;
 }
@@ -707,31 +946,47 @@ Result Module::Interface::GetRegisterInfo(RegisterInfo& register_info) const {
 Result Module::Interface::OpenApplicationArea(u32 access_id) {
     if (device_state != DeviceState::TagMounted) {
         LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
+        if (device_state == DeviceState::TagRemoved) {
+            return ErrCodes::TagRemoved;
+        }
         return ErrCodes::WrongDeviceState;
     }
-    if (AmiiboApplicationDataExist(access_id)) {
-        application_area_data = LoadAmiiboApplicationData(access_id);
-        application_area_id = access_id;
-        is_application_area_initialized = true;
+
+    // Fallback for lack of amiibo keys
+    if (!is_data_decoded) {
+        LOG_WARNING(Service_NFP, "Application area is not initialized");
+        return ErrCodes::ApplicationAreaIsNotInitialized;
     }
-    if (!is_application_area_initialized) {
+
+    if (tag_data.settings.settings.appdata_initialized == 0) {
         LOG_WARNING(Service_NFP, "Application area is not initialized");
         return ErrCodes::ApplicationAreaIsNotInitialized;
     }
+
+    if (tag_data.application_area_id != access_id) {
+        LOG_WARNING(Service_NFP, "Wrong application area id");
+        return ErrCodes::WrongApplicationAreaId;
+    }
+
+    is_application_area_initialized = true;
     return ResultSuccess;
 }
 
-Result Module::Interface::GetApplicationArea(std::vector<u8>& data) const {
+Result Module::Interface::GetApplicationArea(ApplicationArea& data) const {
     if (device_state != DeviceState::TagMounted) {
         LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
+        if (device_state == DeviceState::TagRemoved) {
+            return ErrCodes::TagRemoved;
+        }
         return ErrCodes::WrongDeviceState;
     }
+
     if (!is_application_area_initialized) {
         LOG_ERROR(Service_NFP, "Application area is not initialized");
         return ErrCodes::ApplicationAreaIsNotInitialized;
     }
 
-    data = application_area_data;
+    data = tag_data.application_area;
 
     return ResultSuccess;
 }
@@ -739,46 +994,69 @@ Result Module::Interface::GetApplicationArea(std::vector<u8>& data) const {
 Result Module::Interface::SetApplicationArea(const std::vector<u8>& data) {
     if (device_state != DeviceState::TagMounted) {
         LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
+        if (device_state == DeviceState::TagRemoved) {
+            return ErrCodes::TagRemoved;
+        }
         return ErrCodes::WrongDeviceState;
     }
+
     if (!is_application_area_initialized) {
         LOG_ERROR(Service_NFP, "Application area is not initialized");
         return ErrCodes::ApplicationAreaIsNotInitialized;
     }
-    application_area_data = data;
-    SaveAmiiboApplicationData(application_area_id, application_area_data);
+
+    if (data.size() != sizeof(ApplicationArea)) {
+        LOG_ERROR(Service_NFP, "Wrong data size {}", data.size());
+        return ResultUnknown;
+    }
+
+    std::memcpy(&tag_data.application_area, data.data(), sizeof(ApplicationArea));
     return ResultSuccess;
 }
 
 Result Module::Interface::CreateApplicationArea(u32 access_id, const std::vector<u8>& data) {
     if (device_state != DeviceState::TagMounted) {
         LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
+        if (device_state == DeviceState::TagRemoved) {
+            return ErrCodes::TagRemoved;
+        }
         return ErrCodes::WrongDeviceState;
     }
-    if (AmiiboApplicationDataExist(access_id)) {
+
+    if (tag_data.settings.settings.appdata_initialized != 0) {
         LOG_ERROR(Service_NFP, "Application area already exist");
         return ErrCodes::ApplicationAreaExist;
     }
-    application_area_data = data;
-    application_area_id = access_id;
-    SaveAmiiboApplicationData(application_area_id, application_area_data);
+
+    if (data.size() != sizeof(ApplicationArea)) {
+        LOG_ERROR(Service_NFP, "Wrong data size {}", data.size());
+        return ResultUnknown;
+    }
+
+    std::memcpy(&tag_data.application_area, data.data(), sizeof(ApplicationArea));
+    tag_data.application_area_id = access_id;
+
     return ResultSuccess;
 }
 
-bool Module::Interface::AmiiboApplicationDataExist(u32 access_id) const {
-    // TODO(german77): Check if file exist
-    return false;
-}
+Result Module::Interface::RecreateApplicationArea(u32 access_id, const std::vector<u8>& data) {
+    if (device_state != DeviceState::TagMounted) {
+        LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
+        if (device_state == DeviceState::TagRemoved) {
+            return ErrCodes::TagRemoved;
+        }
+        return ErrCodes::WrongDeviceState;
+    }
 
-std::vector<u8> Module::Interface::LoadAmiiboApplicationData(u32 access_id) const {
-    // TODO(german77): Read file
-    std::vector<u8> data(ApplicationAreaSize);
-    return data;
-}
+    if (data.size() != sizeof(ApplicationArea)) {
+        LOG_ERROR(Service_NFP, "Wrong data size {}", data.size());
+        return ResultUnknown;
+    }
+
+    std::memcpy(&tag_data.application_area, data.data(), sizeof(ApplicationArea));
+    tag_data.application_area_id = access_id;
 
-void Module::Interface::SaveAmiiboApplicationData(u32 access_id,
-                                                  const std::vector<u8>& data) const {
-    // TODO(german77): Save file
+    return ResultSuccess;
 }
 
 u64 Module::Interface::GetHandle() const {
@@ -791,16 +1069,25 @@ DeviceState Module::Interface::GetCurrentState() const {
 }
 
 Core::HID::NpadIdType Module::Interface::GetNpadId() const {
-    return npad_id;
+    // Return first connected npad id as a workaround for lack of a single nfc interface per
+    // controller
+    return system.HIDCore().GetFirstNpadId();
 }
 
-u32 Module::Interface::GetTagPassword(const TagUuid& uuid) const {
-    // Verifiy that the generated password is correct
-    u32 password = 0xAA ^ (uuid[1] ^ uuid[3]);
-    password &= (0x55 ^ (uuid[2] ^ uuid[4])) << 8;
-    password &= (0xAA ^ (uuid[3] ^ uuid[5])) << 16;
-    password &= (0x55 ^ (uuid[4] ^ uuid[6])) << 24;
-    return password;
+AmiiboName Module::Interface::GetAmiiboName(const AmiiboSettings& settings) const {
+    std::array<char16_t, amiibo_name_length> settings_amiibo_name{};
+    AmiiboName amiibo_name{};
+
+    // Convert from big endian to little endian
+    for (std::size_t i = 0; i < amiibo_name_length; i++) {
+        settings_amiibo_name[i] = static_cast<u16>(settings.amiibo_name[i]);
+    }
+
+    // Convert from utf16 to utf8
+    const auto amiibo_name_utf8 = Common::UTF16ToUTF8(settings_amiibo_name.data());
+    memcpy(amiibo_name.data(), amiibo_name_utf8.data(), amiibo_name_utf8.size());
+
+    return amiibo_name;
 }
 
 void InstallInterfaces(SM::ServiceManager& service_manager, Core::System& system) {