Add dependency
<dependency>
<groupId>com.bakaoh</groupId>
<artifactId>altbn128</artifactId>
<version>1.0</version>
<type>pom</type>
</dependency>
compile 'com.bakaoh:altbn128:1.0'
$ git clone https://github.com/bakaoh/cloudflare-altbn128-jni
$ cd cloudflare-altbn128-jni
$ cd src/jni && make macos
$ cd ../.. && ./gradlew jar