The original Java code of this repo is from Google Tink, and has been translated to Kotlin by Cashapp zipline.

Installation

gradle

Add it in your root build.gradle at the end of repositories:

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

Add the dependency

dependencies {
    implementation 'com.github.mixinnetwork:tink-eddsa:0.0.13'
}

Usage

Kotlin

fun main() {
  val keyPair = KeyPair.newKeyPair()
  val signer = Ed25519Sign(keyPair.privateKey)
  val verifier = Ed25519Verify(keyPair.publicKey)

  val msg = "Hello world".toByteArray().toByteString()
  val sig = signer.sign(msg)
  val valid = verifier.verify(sig, msg)
  println("valid: $valid")
}

Java

public class Example {
  public static void main(String[] args) {
    KeyPair keyPair = KeyPair.newKeyPair();
    Ed25519Sign signer = Ed25519Sign.invoke(keyPair.getPrivateKey());
    Ed25519Verify verifier = new Ed25519Verify(keyPair.getPublicKey());

    ByteString msg = ByteString.of("Hello world".getBytes());
    ByteString sig = signer.sign(msg);
    boolean valid = verifier.verify(sig, msg);
    System.out.println("valid: " + valid);
  }
}

Benchmark

MacBook Pro (16-inch, 2019), macOS Monterey, with 2.4GHz i9 32GB

type	rate	iterations	time	data throughput
sign	140.60 MB/s	703 iterations	5002 ms	703.00 MB
verify	285.20 MB/s	1426 iterations	5000 ms	1.39 GB