RealmKeyGenerator.java

package org.keycloak.test;

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openssl.PEMWriter;
import org.jboss.resteasy.security.PemUtils;
import org.keycloak.services.models.RealmModel;

import java.io.IOException;
import java.io.StringWriter;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.Security;

/**
 * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
 * @version $Revision: 1 $
 */
public class RealmKeyGenerator {
    static {
        if (Security.getProvider("BC") == null) Security.addProvider(new BouncyCastleProvider());
    }
    public static void main(String[] args) throws Exception {
        KeyPair keyPair = null;
        try {
            keyPair = KeyPairGenerator.getInstance("RSA").generateKeyPair();
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }

        System.out.println("privateKey : " + printKey(keyPair.getPrivate()));
        System.out.println("publicKey : " + printKey(keyPair.getPublic()));
    }

    private static String printKey(Object key){
        StringWriter writer = new StringWriter();
        PEMWriter pemWriter = new PEMWriter(writer);
        try {
            pemWriter.writeObject(key);
            pemWriter.flush();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        String s = writer.toString();
        return PemUtils.removeBeginEnd(s);

    }
}