package com.de22.kstools;

import java.security.cert.Certificate;
import java.security.*;
import java.io.File;
import java.io.FileInputStream;

/**
 * Exports the private key from the keystore in a pkcs12 format.
 */
public class ExportPrivateKey {
public static void main(String args[]) throws Exception {
	if(args.length < 4) {
		System.out.println("Expected parameters: keystore-path, alias, store-password, key-password.");
	}//if//
	else {
		File keystoreFile = new File(args[0]);
		String aliasName = args[1];
		String storePass = args[2];
		String keyPass = args[3];
		KeyStore keystore = KeyStore.getInstance("JKS");
		Key key;
		
		keystore.load(new FileInputStream(keystoreFile), storePass.toCharArray());
		key = keystore.getKey(aliasName, keyPass.toCharArray());
		
		if(key instanceof PrivateKey) {
			char[] encodedKey = Base64Coder.encode(((PrivateKey) key).getEncoded());
			
			System.out.println("-----BEGIN PRIVATE KEY-----");
			
			for(int i = 0; i < encodedKey.length; i += 76) {
				char[] x = new char[Math.min(encodedKey.length - i, 76)];
				System.arraycopy(encodedKey, i, x, 0, x.length);
				System.out.println(x);
			}//for//
			
			System.out.println("-----END PRIVATE KEY-----");
		}//if//
	}//else//
}//main()//
}//ExportPrivateKey//