import java.security.*;
import java.util.*;
import java.io.*;

class TestSec {
    private static void listKeysInStore(KeyStore keyStore) throws Exception {
        Enumeration<String> keyAliases = keyStore.aliases();
        while (keyAliases.hasMoreElements()) {
            String keyAlias = keyAliases.nextElement();
            if (keyStore.entryInstanceOf(keyAlias, KeyStore.PrivateKeyEntry.class))
                System.out.println(keyAlias);
        }
    }

    public static void main(String[] args) throws Exception {
        // configure keystore name
        String keyStoreName = "JKS";
        final String osName = System.getProperty("os.name");
        if (osName.startsWith("Windows"))
            keyStoreName = "Windows-my";
        else if (osName.startsWith("Mac OS X"))
            keyStoreName = "KeychainStore";
        if (args.length > 0)
            keyStoreName = args[0];
        // do the job
        KeyStore keyStore = KeyStore.getInstance(keyStoreName);
        keyStore.load(null, null);
        listKeysInStore(keyStore);
    }
}