src/main/java/org/openslx/satellitedaemon/util/RndStringEncrypt.java


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package org.openslx.satellitedaemon.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import java.security.UnrecoverableKeyException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;

public class RndStringEncrypt {

	KeyPair pair;

	public RndStringEncrypt(String alias, String password, String file)
			throws NoSuchAlgorithmException, CertificateException,
			FileNotFoundException, IOException, KeyStoreException,
			UnrecoverableKeyException {
		KeyStore keystore = KeyStore.getInstance("JKS");
		keystore.load(new FileInputStream(new File(file)),
				password.toCharArray());
		Certificate cert = null;

		Key key = keystore.getKey(alias, password.toCharArray());

		if (key instanceof PrivateKey) {
			cert = keystore.getCertificate(alias);
			PublicKey publicKey = cert.getPublicKey();
			pair = new KeyPair(publicKey, (PrivateKey) key);
		}
	}

	public byte[] encryptRndString(String message) throws NoSuchAlgorithmException,
			InvalidKeyException, SignatureException {
		Signature signature = Signature.getInstance("SHA256WITHRSA");
		signature.initSign(pair.getPrivate());
		signature.update(message.getBytes());
		return signature.sign();
	}
}