Onion Wrapper

A Java library providing a wrapper for running a Tor client on Android, Linux, macOS and Windows. The wrapper can be used for running hidden services.

The library supports the obfs4, meek_lite and snowflake pluggable transports.

Binaries for Tor and pluggable transports are not included. They can be found in the following Maven artifacts: org.briarproject:{tor,obfs4proxy,snowflake}-{android,linux,macos,windows}. The obfs4proxy artifact provides obfs4 and meek_lite.

The macOS binaries are not signed, so you will need to sign them when packaging your app.

If your Android app is uploaded to Google Play as an app bundle (AAB), you must include the following in build.gradle to ensure that the Tor and pluggable transport binaries are extracted during installation:

android {
    packagingOptions {
        jniLibs {
            useLegacyPackaging = true
        }
    }
}

On Android, the library uses dont-kill-me-lib to hold a wake lock whenever Tor's network connection is enabled. The helper classes in dont-kill-me-lib can be used to work around certain manufacturer-specific power management restrictions that would prevent Tor from running in the background for long periods.