connectbot/sshlib

package com.trilead.ssh2.crypto.keys;

import com.google.crypto.tink.subtle.Ed25519Sign;

import java.security.GeneralSecurityException;
import java.security.KeyPair;
import java.security.KeyPairGeneratorSpi;
import java.security.SecureRandom;

public class Ed25519KeyPairGenerator extends KeyPairGeneratorSpi {
    @Override
    public void initialize(int keySize, SecureRandom secureRandom) {
        // ignored.
    }

    @Override
    public KeyPair generateKeyPair() {
        try {
            Ed25519Sign.KeyPair kp = Ed25519Sign.KeyPair.newKeyPair();
            return new KeyPair(new Ed25519PublicKey(kp.getPublicKey()), new Ed25519PrivateKey(kp.getPrivateKey()));
        } catch (GeneralSecurityException e) {
            throw new IllegalStateException(e);
        }
    }
}