connectbot/sshlib

package com.trilead.ssh2.crypto.keys;

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.Provider;
import java.security.Security;

public class Ed25519Provider extends Provider {
    public static final String KEY_ALGORITHM = "Ed25519";
    private static final Object sInitLock = new Object();
    private static boolean sInitialized = false;

    public Ed25519Provider() {
        super("ConnectBot Ed25519 Provider", 1.0, "Not for use elsewhere");
        AccessController.doPrivileged((PrivilegedAction<Object>) () -> {
            setup();
            return null;
        });
    }

    protected void setup() {
        put("KeyFactory." + KEY_ALGORITHM, getClass().getPackage().getName() + ".Ed25519KeyFactory");
        put("KeyPairGenerator." + KEY_ALGORITHM, getClass().getPackage().getName() + ".Ed25519KeyPairGenerator");

        //   id-Ed25519   OBJECT IDENTIFIER ::= { 1 3 101 112 }
        put("Alg.Alias.KeyFactory.1.3.101.112", KEY_ALGORITHM);
        put("Alg.Alias.KeyFactory.EdDSA", KEY_ALGORITHM);
        put("Alg.Alias.KeyFactory.OID.1.3.101.112", KEY_ALGORITHM);
        put("Alg.Alias.KeyPairGenerator.1.3.101.112", KEY_ALGORITHM);
        put("Alg.Alias.KeyPairGenerator.EdDSA", KEY_ALGORITHM);
        put("Alg.Alias.KeyPairGenerator.OID.1.3.101.112", KEY_ALGORITHM);
    }

    public static void insertIfNeeded() {
        synchronized (sInitLock) {
            if (!sInitialized) {
                Security.addProvider(new Ed25519Provider());
                sInitialized = true;
            }
        }
    }
}