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An open-source tool for multi-party document signing, client forMeeSign Server.

To learn more about MeeSign, visitour website.

1. Install Flutter, be sure to also follow the instructions for the platform you want to build for, i.e.enable desktop support or set up Android SDK (all described on the same page). At the moment, the following targets are supported:Linux, Windows, Android

2. Install Rust

   1. Android only:

      1. Add Android targets for cross-compilation

         rustup target add aarch64-linux-android armv7-linux-androideabi x86_64-linux-android i686-linux-android

      2. Point cargo to the linker provided by Android NDK, a helper script for generating the necessary configuration is provided intool/cargo-config-gen-android.sh, append the output to yourcargo configuration file, e.g. by:

         ANDROID_NDK_HOME="path/to/ndk/version" ANDROID_API="30" bash ./tool/cargo-config-gen-android.sh>>~/.cargo/config.toml

3. Clone the repository:

   git clone https://github.com/crocs-muni/meesign-client --recurse-submodules

4. Copy MeeSign CA certificate toassets/ca-cert.pem

   If you have a local build of MeeSign server, the corresponding file is placed inkeys/meesign-ca-cert.pem.

5. Build the app:

   flutter build

   or run it directly:

   flutter run

The build can be customized by passing--dart-define=OPTION=VALUE toflutter run orflutter build, seeflutter run --help for more details. The following definitions are considered:

• ALLOW_BAD_CERTS: Iftrue, certificate checks are skipped and any server certificate is accepted.

For increased security, the app can optionally transfer the user's private key share in the given group to a smart card. To use this feature, install a supported applet on your card and select the appropriate protocol when creating a new group.

Supported applets:

• JCFROST

• This work was supported by the Ministry of the Interior of the Czech Republic under grant VJ01010084 in program IMPAKT I.