felica-tool

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Application for analyzing characteristics of FeliCa cards

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# FeliCa Tool

# Overview

This project implements tools for performing deep analysis of FeliCa card capabilities and the extraction of available data.

This application enables users to:
* Extract information about FeliCa cards, including:
  * Card identification (IDM, PMM);
  * System codes and services;
  * Block information and data;
  * Card capabilities.
* View detailed scan progress with step-by-step execution timings;
* View scan results, with information assembled from performed commands:
  * General information;
  * Command support report;
  * Enumeration of the detected service providers;
  * Per-system hierarchy overview:
    * Count of child nodes;
    * Key versions and types;
    * Auxiliary node properties;
    * Other node attributes;
    * Block data;
    * Related node annotation (names, service providers, etc).

# Requirements

* Android Studio;
* An Android device with NFC hardware and Android API level 31 or higher (Android 12);
* FeliCa targets to scan (transportation cards, mobile wallet passes, etc.).

# Usage

* Build and install the application to your device using Android Studio;
* Enable NFC on your Android device if not already enabled;
* Open the FeliCa Tool application;
* Place a FeliCa card near the device's NFC antenna;
* The application will automatically detect the card and begin the scanning process;
* Monitor the scan progress through the step-by-step interface;
* View detailed results by expanding individual steps or accessing the scan overview;
* Remove the card when scanning is complete.

# Project Structure

* `shared` - Kotlin Multiplatform library for platform-neutral code and reusable resources:
  * Core FeliCa protocol models and entities;
  * Command validators and parsers;
  * Response validators and parsers;
  * Protocol constants and enumerations;
  * Shared scan orchestration, analysis, and service metadata.
* `androidApp` - Android application containing:
  * Android NFC reader integration;
  * Android application entry points;
  * Compose UI components;
  * Android-specific export and asset lookup helpers.
* `assets` - Project screenshots and README media.

Within the Android app:
* `felica` - Android-specific FeliCa target implementation;
* `nfc` - Android NFC reader integration;
* `ui` - Android Compose screens and components;
* `util` - Android export and resource-mapping helpers.

Within the shared module:
* `felica` - Core FeliCa protocol implementation containing:
  * Protocol models and entities;
  * Command/Response class validators and parsers;
  * Protocol constants and enumerations.
* `service` / `overview` - Shared scan orchestration, logs, and overview models;
* `util` - Shared metadata, grouping, and service-provider catalogs;
* `ui` - Shared scan-step model data.

# Supported FeliCa Commands

The following commands are being analyzed by the application:

| Command                                   | Command Code | IDM on Command | 0x00/0x02 (RC-S914)  | 0x00/0x03 (RC-S914 for export markets) | 0x01 (RC-S915) | 0x0B (Unknown RC-S95X) | 0x20 (RC-S962) | 0x24 (Unknown China/Hong Kong version) | 0x31 (Unknown RC-SA SD1) | 0x32 (RC-SA00/1) | 0x36 (RC-SA04/1) | 0x38 (Unknown SD2) | 0x3B (Unknown SD2) | 0x44 (RC-SA20/1) | 0x46 (RC-SA21/2) | 0x16 (Mobile FeliCa 4.0 for Apple Wallet) | 0x18 (Mobile FeliCa 4.1) | 0xF1 (RC-S966 FeliCa Lite-S) | Notes                                                                                          |
|-------------------------------------------|--------------|----------------|----------------------|----------------------------------------|----------------|------------------------|----------------|----------------------------------------|--------------------------|------------------|------------------|--------------------|--------------------|------------------|------------------|-------------------------------------------|--------------------------|------------------------------|------------------------------------------------------------------------------------------------|
| Polling                                   | `00`         | ✗              | ✓                    | ✓                                      | ✓              | ✓✦                     | ✓✦             | ✓✦                                     | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓✦                                        | ✓✦                       | ✓                            | Reading card IDM and PMM data                                                                  |
| Polling (System Code)                     | `00`         | ✗              | ✓                    | ✓                                      | ✓              | ✓✦                     | ✓✦             | ✓✦                                     | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓✦                                        | ✓✦                       | ✓                            | Request primary system code of the card using polling command                                  |
| Polling (Communication Performance)       | `00`         | ✗              | ✗                    | ✗                                      | ✗              | ✓✦                     | ✓✦             | ✓✦                                     | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓✦                                        | ✓✦                       | ✓                            | Request information about supported communication speeds using polling command                 |
| Request Service                           | `02`         | ✓              | ✓                    | ✓                                      | ✓              | ✓✦                     | ✓✦             | ✓✦ (w/o unknown)                       | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓                                         | ✓                        | ✗                            | Request key versions for given nodes                                                           |
| Request Response                          | `04`         | ✓              | ✓                    | ✓                                      | ✓              | ✓✦                     | ✓✦             | ✓                                      | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓                                         | ✓                        | ✗                            | Request response from the card                                                                 |
| Read Without Encryption                   | `06`         | ✓              | ✓ (12)               | ✓ (?)                                  | ✓ (12)         | ✓✦ (12)                | ✓✦ (12)        | ✓✦ (12)                                | ✓ (15)                   | ✓ (15)           | ✓ (15)           | ✓ (15)             | ✓ (15)             | ✓ (15)           | ✓ (15)           | ✓ (15)                                    | ✓ (15)                   | ✓ (4)                        | Read block data from services that don't require authentication                                |
| Write Without Encryption                  | `08`         | ✓              | ✓                    | ✓                                      | ✓              | ✓✦ (10)                | ✓✦ (10)        | ✓                                      | ✓ (13)                   | ✓ (13)           | ✓ (13)           | ✓ (13)             | ✓ (13)             | ✓ (13)           | ✓ (13)           | ✓ (13)                                    | ✓ (13)                   | ✓ (1, 2* with MAC)           | Write block data to services that don't require authentication                                 |
| Search Service Code                       | `0A`         | ✓              | ✓                    | ✗                                      | ✓              | ✓✦                     | ✓✦             | ✗                                      | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓                                         | ✓                        | ✗                            | Request node registered in the system iteratively                                              |
| Request System Code                       | `0C`         | ✓              | ✓                    | ✗                                      | ✓              | ✓✦                     | ✓✦             | ✓                                      | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓                                         | ✓                        | ✗                            | Request all system codes registered to the card                                                |
| Request Block Information                 | `0E`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✗                        | ✗                | ✗                | ✗                  | ✗                  | ✗                | ✗                | ✗                                         | ✓                        | ✗                            | Request the number of blocks assigned to nodes                                                 |
| Request Block Information Ex              | `1E`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✗                        | ✗                | ✗                | ✗                  | ✗                  | ✗                | ✗                | ✗                                         | ✓                        | ✗                            | Request the number of allocated and free blocks for nodes                                      |
| Request Code List                         | `1A`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✗                        | ✗                | ✗                | ✗                  | ✗                  | ✗                | ✗                | ✗                                         | ✓                        | ✗                            | Request a list of nodes for a given root node iteratively                                      |
| Set Parameter                             | `20`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✗                        | ✗                | ✗                | ✗                  | ✗                  | ✗                | ✗                | ✗                                         | ✓                        | ✗                            | Set card communication parameters (encryption type and node code size)                         |
| Get Container Issue Information           | `22`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✗                        | ✗                | ✗                | ✗                  | ✗                  | ✗                | ✗                | ✓                                         | ✓                        | ✗                            | Get container-specific information including format version and mobile phone model             |
| Get Area Information                      | `24`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✗                        | ✗                | ✗                | ✗                  | ✗                  | ✗                | ✗                | ✗                                         | ✓                        | ✗                            | Get information about a specific area **(Official name and exact purpose are not known)**      |
| Get Container Property                    | `2E`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✗                        | ✗                | ✗                | ✗                  | ✗                  | ✗                | ✗                | ✗                                         | ✓                        | ✗                            | Get container property data by index **(Official name and exact purpose are not known)**       |
| Get Node Property (Value Limited Service) | `28`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✗                        | ✗                | ✗                | ✗                  | ✓                  | ✓                | ✓                | ✗                                         | ✗                        | ✗                            | Get value-limited purse service properties for nodes                                           |
| Get Node Property (MAC Communication)     | `28`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✗                        | ✗                | ✗                | ✗                  | ✓                  | ✓                | ✓                | ✗                                         | ✗                        | ✗                            | Get MAC communication properties for nodes                                                     |
| Request Service V2                        | `32`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓                                         | ✓                        | ✗                            | Request AES and DES key versions for nodes alongside the key type identifier                   |
| Internal Authenticate And Read            | `34`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✗                        | ✗                | ✗                | ✗                  | ✓                  | ✓                | ✓                | ✗                                         | ✗                        | ✗                            | Read block data validated with a MAC after sending a challenge and receiving a write challenge |
| Get System Status                         | `38`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓                                         | ✓                        | ✗                            | Get current system status information from the card                                            |
| Request Product Information               | `3A`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓                                         | ✓                        | ✗                            | Request product information from the card                                                      |
| Request Specification Version             | `3C`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓                                         | ✓                        | ✗                            | Get card feature version and supported option versions                                         |
| Reset Mode                                | `3E`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓                                         | ✓                        | ✗                            | Reset card mode to Mode0                                                                       |
| Get Container ID                          | `70`         | ✗              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✗                        | ✗                | ✗                | ✗                  | ✗                  | ✗                | ✗                | ✗                                         | ✓                        | ✗                            | Get container IDM from mobile FeliCa targets                                                   |
| Authentication1 (DES)                     | `10`         | ✓              | ✓                    | ✓                                      | ✓              | ✓✦                     | ✓✦             | ✓                                      | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓                                         | ✓                        | ✗                            | Start DES-based mutual authentication                                                          |
| Authentication1 (AES)                     | `40`         | ✓              | ✗                    | ✗                                      | ✗              | ✗                      | ✗              | ✗                                      | ✓                        | ✓                | ✓                | ✓                  | ✓                  | ✓                | ✓                | ✓                                         | ✓                        | ✗                            | Start AES-based mutual authentication                                                          |
| Echo                                      | `F000`       | ✗              | ✗                    | ✗                                      | ✓ (252)        | ✓ (238)                | ✓ (252)        | ✗                                      | ✓ (252)                  | ✓ (252)          | ✓ (252)          | ✓ (252)            | ✓ (252)            | ✓ (252)          | ✓ (252)          | ✓ (252)                                   | ✓ (252)                  | ✓ (75)                       | Test communication with the card                                                               |

**Legend:** `✓✦` means the command is supported, but the tested target did not respond when non-standard trailing data bytes were appended to the command. Normally, cards should process non-encrypted commands with trailing data by ignoring leftover bytes. The only consistent exception observed so far is mobile phones, which constrain the allowed and recognized Polling command forms.

**Note:** If you have tested this application with other FeliCa card types or targets and would like to contribute your results, we would gladly add them to this compatibility table. Please share your findings by opening an issue or submitting a pull request with the command support details for your specific card type.

# Testing

Most models used in the project have comprehensive data parsing tests.

Run tests using:
```bash
./gradlew :androidApp:testDebugUnitTest --info
```

# Building

Build and install the debug version:
```bash
./gradlew :androidApp:installDebug
```

Build the shared Android artifact:
```bash
./gradlew :shared:assemble
```

Build the Android debug APK and shared library:
```bash
./gradlew :androidApp:assembleDebug :shared:assemble
```

# Improvements

* Improve annotation of known system/area codes and IC types;
* Improve/refactor the UI part of the project.
* Add testing for some more commands with unknown meaning;
* Add support for FALP commands (need hardware to test on);
* (WIP) Implement support for DES authentication commands;
* (WIP) Support external readers (PN532, PCSC);
* (WIP) Add desktop support (macOS, Linux, Windows);
* Add root-related functionality:
  * The ability to emulate a FeliCa standard card;
  * Support for commands with two-byte codes, some of which may only be available on the wired interface when communicating with the embedded Osaifu-Keitai applet or chip.

# Known Issues

* Google Pixel devices with ST NFC controllers can have coupling issues with some FeliCa chips, making reads more error-prone. This primarily affects Octopus cards with IC codes `24`, `3B`, or `38`.

# Contributing

If you've encountered an issue or would like to help improve this project, feel free to open an issue or submit a pull request.

When submitting command compatibility results, include details about your specific card type and which commands work or don't work. Feel free to redact the unique part of the IDM (bytes 3-6, zero-indexed) or the block data if preferred. This project features a 'privacy' mode, which redacts sensitive data from exported files automatically.

Use of AI-assisted tools for contributions is accepted. However, as AI is a powerful tool that is subject to abuse, any wide-reaching or architectural changes made with AI assistance should be discussed with the maintainers beforehand.

# Notes

* This application is intended for educational and analysis purposes;
* FeliCa is a registered trademark of Sony Corporation.

# References

* Documentation:
  * FeliCa card user's manual (Excerpted edition) - basic command reference, IDM, PMM, timeout meaning;
  * FeliCa Lite-S user's manual - specifics of FeliCa lite tags (systems, services).

* Online Resources:
  * [Android NFC Documentation](https://developer.android.com/guide/topics/connectivity/nfc) - information on implementing NfcF tag reading on Android;
  * [NUllableVoidPtr - NFCFInfo](https://nullablevoidptr.github.io/nfcf-info/) - list of command codes, system codes, and references to other resources;
  * [Metrodroid FeliCa Wiki](https://github.com/metrodroid/metrodroid/wiki/FeliCa) - system codes;
  * [OnakaSuita Wiki - FeliCa Commands](https://wiki.onakasuita.org/pukiwiki/?FeliCa%2Fコマンド) - command codes;
  * [Oliet - oliet.hatenablog.jp](https://oliet.hatenablog.jp/), [blog.oliet.tech](https://blog.oliet.tech) (removed) - insights into the operation of the FeliCa protocol.
  
* Existing Projects:
  * [nfcpy - Sony FeliCa implementation](https://github.com/nfcpy/nfcpy/blob/v1.0.4/src/nfc/tag/tt3_sony.py) - timeout calculation, service codes;
  * [TRETJapanNFCReader](https://github.com/treastrain/TRETJapanNFCReader) - system codes and commands;
  * [felica-dumper](https://github.com/soltia48/felica-dumper) - upcoming implementation of Authentication commands;
  * HCE-F-Unlocker (removed) - example of an Xposed module to remove HCE-F system code limitation;

* Analyzed applications:
  * Osaifu-Keitai stack versions 2.*/35.* - source of some of the discovered commands.

# License

This project is licensed under the Apache License 2.0 - see the [LICENSE](LICENSE) file for details.

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