Java implementation of the sr25519 signature algorithm (schnorr over ristretto25519). The existing rust implementation is here.
This library is currently able to create sr25519 keys, import sr25519 keys, and sign and verify messages.
Example: signing and verification
import com.debuggor.schnorrkel.utils.HexUtils;
public class SignTest {
public static void main(String[] args) throws Exception {
KeyPair keyPair = KeyPair.fromSecretSeed(HexUtils.hexToBytes("579d7aa286b37b800b95fe41adabbf0c2a577caf2854baeca98f8fb242ff43ae"), ExpansionMode.Ed25519);
byte[] message = "test message".getBytes();
SigningContext ctx = SigningContext.createSigningContext("good".getBytes());
SigningTranscript t = ctx.bytes(message);
Signature signature = keyPair.sign(t);
byte[] sign = signature.to_bytes();
System.out.println(HexUtils.bytesToHex(sign));
SigningContext ctx2 = SigningContext.createSigningContext("good".getBytes());
SigningTranscript t2 = ctx2.bytes(message);
KeyPair fromPublicKey = KeyPair.fromPublicKey(keyPair.getPublicKey().toPublicKey());
boolean verify = fromPublicKey.verify(t2, sign);
System.out.println(verify);
}
}Thanks to @str4d and @isislovecruft for the open source Curve25519 library