java.security.SignedObject Java Examples

private HashSet<CollectData> getSignedCollects(HashSet<SignedObject> signedCollects) {

        HashSet<CollectData> colls = new HashSet<CollectData>();

        for (SignedObject so : signedCollects) {

            CollectData c;
            try {
                c = (CollectData) so.getObject();
                int sender = c.getPid();
                if (tomLayer.verifySignature(so, sender)) {
                    colls.add(c);
                }
            } catch (IOException | ClassNotFoundException ex) {
                logger.error("Error processing collect data", ex);
            }
        }

        return colls;

    }
 

/**
 * Keep collect from an incoming SYNC message
 * @param ts the current regency
 * @param signedCollect the signed collect data
 */
public void addCollect(int regency, SignedObject signedCollect) {

    HashSet<SignedObject> c = collects.get(regency);
    if (c == null) c = new HashSet<SignedObject>();
    c.add(signedCollect);
    collects.put(regency, c);
}
 

public final void connected(AbstractConnection connection) {
		SignedObject signed_key = Renderer.getRegistrationClient().getSignedRegistrationKey();
		Connection wrapped_connection = (Connection)conn.getWrappedConnection();
		matchmaking_login_interface.setLocalRemoteAddress(wrapped_connection.getLocalAddress());
System.out.println("wrapped_connection.getLocalAddress()	 = " + wrapped_connection.getLocalAddress()	);
		int revision = LocalInput.getRevision();
		if (!Renderer.isRegistered())
			matchmaking_login_interface.loginAsGuest(revision);
		else if (login_details != null)
			matchmaking_login_interface.createUser(login, login_details, signed_key, revision);
		else
			matchmaking_login_interface.login(login, signed_key, revision);
	}
 

private final String checkKey(SignedObject reg_key) {
	String reg_code = null;
	if (reg_key != null) {
		try {
			if (RegistrationKey.verify(server.getPublicRegKey(), reg_key)) {
				// This cast should not fail, because we signed it and the signature checked out ok
				RegistrationInfo reg_info = (RegistrationInfo)reg_key.getObject();
				reg_code = RegistrationKey.encode(reg_info.getKey());
			}
		} catch (Exception e) {
			MatchmakingServer.getLogger().warning("Could not verify signature because of: " + e.getMessage());
		}
	}
	return reg_code;
}
 

private SignedObject register(RegistrationRequest reg_request) throws SQLException, ServletException {
	long reg_key = reg_request.getKey();
	String affiliate_id = reg_request.getAffiliate();
	String encoded_key = RegistrationKey.encode(reg_key);
	RegistrationInfo reg_info = DBInterface.registerKey(getDataSource(), reg_request);
	return sign(reg_info);
}
 

public final void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
		String request_key_str = normalizeKey(req.getParameter("key"));
		String affiliate_id = req.getParameter("affiliate_id");
		String current_affiliate_id = req.getParameter("current_affiliate_id");
		int version = parseInt(req.getParameter("version"), 0);
		boolean timelimit = parseBoolean(req.getParameter("timelimit"));
		int maxtime = parseInt(req.getParameter("maxtime"), 0);
		boolean forcequit = parseBoolean(req.getParameter("forcequit"));
		int maxgames = parseInt(req.getParameter("maxgames"), 0);
		
log("Oddlabs: got key request: remote host = " + req.getRemoteHost() + " | key_str = " + request_key_str + " | current_affiliate_id = " + current_affiliate_id + " | affiliate_id = " + affiliate_id + " | version = " + version + " | timelimit = " + timelimit + " | maxtime = " + maxtime + " | forcequit = " + forcequit + " | maxgames = " + maxgames);
		
		String key_str = createKey(request_key_str, current_affiliate_id);
		long key = RegistrationKey.decode(key_str);
		try {
			SignedObject signed_registration = register(new RegistrationRequest(key, affiliate_id, version, timelimit, maxtime, forcequit, maxgames));
			res.setContentType("application/octet-stream");

			ServletOutputStream out = res.getOutputStream();
			ObjectOutputStream obj_out = new ObjectOutputStream(out);
			obj_out.writeObject(signed_registration);
			obj_out.close();
			log("Oddlabs: Registered key: " + key_str);
		} catch (Exception e) {
			log("got exception while registering: " + e);
			res.sendError(500, e.toString());
		}
	}
 

public static void main(String[] args) throws Exception {

        String SIGALG = "SHA1withRSA";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = kpg.generateKeyPair();

        SignedObject so1 = new SignedObject("Hello", kp.getPrivate(),
                Signature.getInstance(SIGALG));

        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(byteOut);
        out.writeObject(so1);
        out.close();

        byte[] data = byteOut.toByteArray();

        SignedObject so2 = (SignedObject)new ObjectInputStream(
                new ByteArrayInputStream(data)).readObject();

        if (!so2.getObject().equals("Hello")) {
            throw new Exception("Content changed");
        }
        if (!so2.getAlgorithm().equals(SIGALG)) {
            throw new Exception("Signature algorithm unknown");
        }
        if (!so2.verify(kp.getPublic(), Signature.getInstance(SIGALG))) {
            throw new Exception("Not verified");
        }
    }
 

public static void main(String[] args) throws Exception {

        String SIGALG = "SHA1withRSA";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = kpg.generateKeyPair();

        SignedObject so1 = new SignedObject("Hello", kp.getPrivate(),
                Signature.getInstance(SIGALG));

        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(byteOut);
        out.writeObject(so1);
        out.close();

        byte[] data = byteOut.toByteArray();

        SignedObject so2 = (SignedObject)new ObjectInputStream(
                new ByteArrayInputStream(data)).readObject();

        if (!so2.getObject().equals("Hello")) {
            throw new Exception("Content changed");
        }
        if (!so2.getAlgorithm().equals(SIGALG)) {
            throw new Exception("Signature algorithm unknown");
        }
        if (!so2.verify(kp.getPublic(), Signature.getInstance(SIGALG))) {
            throw new Exception("Not verified");
        }
    }
 

/**
 * Verifies the signature of a signed object
 *
 * @param so Signed object to be verified
 * @param sender Replica id that supposedly signed this object
 * @return True if the signature is valid, false otherwise
 */
public boolean verifySignature(SignedObject so, int sender) {
    try {
        return so.verify(publicKey.get(sender), engine);
    } catch (Exception e) {
        logger.error("Failed to verify object signature",e);
    }
    return false;
}
 

public SignedObject sign(Serializable obj) {
    try {
        return new SignedObject(obj, privateKey, engine);
    } catch (Exception e) {
        logger.error("Failed to sign object",e);
        return null;
    }
}
 

public static void main(String[] args) throws Exception {

        String SIGALG = "SHA1withRSA";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = kpg.generateKeyPair();

        SignedObject so1 = new SignedObject("Hello", kp.getPrivate(),
                Signature.getInstance(SIGALG));

        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(byteOut);
        out.writeObject(so1);
        out.close();

        byte[] data = byteOut.toByteArray();

        SignedObject so2 = (SignedObject)new ObjectInputStream(
                new ByteArrayInputStream(data)).readObject();

        if (!so2.getObject().equals("Hello")) {
            throw new Exception("Content changed");
        }
        if (!so2.getAlgorithm().equals(SIGALG)) {
            throw new Exception("Signature algorithm unknown");
        }
        if (!so2.verify(kp.getPublic(), Signature.getInstance(SIGALG))) {
            throw new Exception("Not verified");
        }
    }
 

public static void main(String[] args) throws Exception {

        String SIGALG = "SHA1withRSA";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = kpg.generateKeyPair();

        SignedObject so1 = new SignedObject("Hello", kp.getPrivate(),
                Signature.getInstance(SIGALG));

        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(byteOut);
        out.writeObject(so1);
        out.close();

        byte[] data = byteOut.toByteArray();

        SignedObject so2 = (SignedObject)new ObjectInputStream(
                new ByteArrayInputStream(data)).readObject();

        if (!so2.getObject().equals("Hello")) {
            throw new Exception("Content changed");
        }
        if (!so2.getAlgorithm().equals(SIGALG)) {
            throw new Exception("Signature algorithm unknown");
        }
        if (!so2.verify(kp.getPublic(), Signature.getInstance(SIGALG))) {
            throw new Exception("Not verified");
        }
    }
 

public static void main(String[] args) throws Exception {

        String SIGALG = "SHA1withRSA";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = kpg.generateKeyPair();

        SignedObject so1 = new SignedObject("Hello", kp.getPrivate(),
                Signature.getInstance(SIGALG));

        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(byteOut);
        out.writeObject(so1);
        out.close();

        byte[] data = byteOut.toByteArray();

        SignedObject so2 = (SignedObject)new ObjectInputStream(
                new ByteArrayInputStream(data)).readObject();

        if (!so2.getObject().equals("Hello")) {
            throw new Exception("Content changed");
        }
        if (!so2.getAlgorithm().equals(SIGALG)) {
            throw new Exception("Signature algorithm unknown");
        }
        if (!so2.verify(kp.getPublic(), Signature.getInstance(SIGALG))) {
            throw new Exception("Not verified");
        }
    }
 

public static void main(String[] args) throws Exception {

        String SIGALG = "SHA1withRSA";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = kpg.generateKeyPair();

        SignedObject so1 = new SignedObject("Hello", kp.getPrivate(),
                Signature.getInstance(SIGALG));

        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(byteOut);
        out.writeObject(so1);
        out.close();

        byte[] data = byteOut.toByteArray();

        SignedObject so2 = (SignedObject)new ObjectInputStream(
                new ByteArrayInputStream(data)).readObject();

        if (!so2.getObject().equals("Hello")) {
            throw new Exception("Content changed");
        }
        if (!so2.getAlgorithm().equals(SIGALG)) {
            throw new Exception("Signature algorithm unknown");
        }
        if (!so2.verify(kp.getPublic(), Signature.getInstance(SIGALG))) {
            throw new Exception("Not verified");
        }
    }
 

public static void main(String[] args) throws Exception {

        String SIGALG = "SHA1withRSA";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = kpg.generateKeyPair();

        SignedObject so1 = new SignedObject("Hello", kp.getPrivate(),
                Signature.getInstance(SIGALG));

        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(byteOut);
        out.writeObject(so1);
        out.close();

        byte[] data = byteOut.toByteArray();

        SignedObject so2 = (SignedObject)new ObjectInputStream(
                new ByteArrayInputStream(data)).readObject();

        if (!so2.getObject().equals("Hello")) {
            throw new Exception("Content changed");
        }
        if (!so2.getAlgorithm().equals(SIGALG)) {
            throw new Exception("Signature algorithm unknown");
        }
        if (!so2.verify(kp.getPublic(), Signature.getInstance(SIGALG))) {
            throw new Exception("Not verified");
        }
    }
 

public static void main(String[] args) throws Exception {

        String SIGALG = "SHA1withRSA";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = kpg.generateKeyPair();

        SignedObject so1 = new SignedObject("Hello", kp.getPrivate(),
                Signature.getInstance(SIGALG));

        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(byteOut);
        out.writeObject(so1);
        out.close();

        byte[] data = byteOut.toByteArray();

        SignedObject so2 = (SignedObject)new ObjectInputStream(
                new ByteArrayInputStream(data)).readObject();

        if (!so2.getObject().equals("Hello")) {
            throw new Exception("Content changed");
        }
        if (!so2.getAlgorithm().equals(SIGALG)) {
            throw new Exception("Signature algorithm unknown");
        }
        if (!so2.verify(kp.getPublic(), Signature.getInstance(SIGALG))) {
            throw new Exception("Not verified");
        }
    }
 

public static void main(String[] args) throws Exception {

        String SIGALG = "SHA1withRSA";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = kpg.generateKeyPair();

        SignedObject so1 = new SignedObject("Hello", kp.getPrivate(),
                Signature.getInstance(SIGALG));

        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(byteOut);
        out.writeObject(so1);
        out.close();

        byte[] data = byteOut.toByteArray();

        SignedObject so2 = (SignedObject)new ObjectInputStream(
                new ByteArrayInputStream(data)).readObject();

        if (!so2.getObject().equals("Hello")) {
            throw new Exception("Content changed");
        }
        if (!so2.getAlgorithm().equals(SIGALG)) {
            throw new Exception("Signature algorithm unknown");
        }
        if (!so2.verify(kp.getPublic(), Signature.getInstance(SIGALG))) {
            throw new Exception("Not verified");
        }
    }
 

public static void main(String[] args) throws Exception {

        String SIGALG = "SHA1withRSA";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = kpg.generateKeyPair();

        SignedObject so1 = new SignedObject("Hello", kp.getPrivate(),
                Signature.getInstance(SIGALG));

        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(byteOut);
        out.writeObject(so1);
        out.close();

        byte[] data = byteOut.toByteArray();

        SignedObject so2 = (SignedObject)new ObjectInputStream(
                new ByteArrayInputStream(data)).readObject();

        if (!so2.getObject().equals("Hello")) {
            throw new Exception("Content changed");
        }
        if (!so2.getAlgorithm().equals(SIGALG)) {
            throw new Exception("Signature algorithm unknown");
        }
        if (!so2.verify(kp.getPublic(), Signature.getInstance(SIGALG))) {
            throw new Exception("Not verified");
        }
    }
 

public static void main(String[] args) throws Exception {

        String SIGALG = "SHA1withRSA";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = kpg.generateKeyPair();

        SignedObject so1 = new SignedObject("Hello", kp.getPrivate(),
                Signature.getInstance(SIGALG));

        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(byteOut);
        out.writeObject(so1);
        out.close();

        byte[] data = byteOut.toByteArray();

        SignedObject so2 = (SignedObject)new ObjectInputStream(
                new ByteArrayInputStream(data)).readObject();

        if (!so2.getObject().equals("Hello")) {
            throw new Exception("Content changed");
        }
        if (!so2.getAlgorithm().equals(SIGALG)) {
            throw new Exception("Signature algorithm unknown");
        }
        if (!so2.verify(kp.getPublic(), Signature.getInstance(SIGALG))) {
            throw new Exception("Not verified");
        }
    }
 

public static void main(String[] args) throws Exception {

        String SIGALG = "SHA1withRSA";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = kpg.generateKeyPair();

        SignedObject so1 = new SignedObject("Hello", kp.getPrivate(),
                Signature.getInstance(SIGALG));

        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(byteOut);
        out.writeObject(so1);
        out.close();

        byte[] data = byteOut.toByteArray();

        SignedObject so2 = (SignedObject)new ObjectInputStream(
                new ByteArrayInputStream(data)).readObject();

        if (!so2.getObject().equals("Hello")) {
            throw new Exception("Content changed");
        }
        if (!so2.getAlgorithm().equals(SIGALG)) {
            throw new Exception("Signature algorithm unknown");
        }
        if (!so2.verify(kp.getPublic(), Signature.getInstance(SIGALG))) {
            throw new Exception("Not verified");
        }
    }
 

public static void main(String[] args) throws Exception {

        String SIGALG = "SHA1withRSA";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = kpg.generateKeyPair();

        SignedObject so1 = new SignedObject("Hello", kp.getPrivate(),
                Signature.getInstance(SIGALG));

        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(byteOut);
        out.writeObject(so1);
        out.close();

        byte[] data = byteOut.toByteArray();

        SignedObject so2 = (SignedObject)new ObjectInputStream(
                new ByteArrayInputStream(data)).readObject();

        if (!so2.getObject().equals("Hello")) {
            throw new Exception("Content changed");
        }
        if (!so2.getAlgorithm().equals(SIGALG)) {
            throw new Exception("Signature algorithm unknown");
        }
        if (!so2.verify(kp.getPublic(), Signature.getInstance(SIGALG))) {
            throw new Exception("Not verified");
        }
    }
 

public static void main(String args[]) throws Exception {
    KeyPairGenerator kg = KeyPairGenerator.getInstance(DSA);
    kg.initialize(KEY_SIZE);
    KeyPair kp = kg.genKeyPair();

    Signature signature = Signature.getInstance(DSA);
    Test original = new Test();
    SignedObject so = new SignedObject(original, kp.getPrivate(),
            signature);
    System.out.println("Signature algorithm: " + so.getAlgorithm());

    signature = Signature.getInstance(DSA, "SUN");
    if (!so.verify(kp.getPublic(), signature)) {
        throw new RuntimeException("Verification failed");
    }

    kg = KeyPairGenerator.getInstance(DSA);
    kg.initialize(KEY_SIZE);
    kp = kg.genKeyPair();

    if (so.verify(kp.getPublic(), signature)) {
        throw new RuntimeException("Unexpected success");
    }

    Object copy = so.getObject();
    if (!original.equals(copy)) {
        throw new RuntimeException("Signed object is not equal "
                + "to original one: " + copy);
    }

    /*
     * The signed object is a copy of an original one.
     * Once the copy is made, further manipulation
     * of the original object shouldn't has any effect on the copy.
     */
    original.set(MAGIC - 1);
    copy = so.getObject();
    if (original.equals(copy)) {
        throw new RuntimeException("Signed object is not a copy "
                + "of original one: " + copy);
    }

    System.out.println("Test passed");
}
 

public final static boolean verify(PublicKey public_key, SignedObject signed_object) throws GeneralSecurityException {
	return signed_object.verify(public_key, Signature.getInstance(RegServiceInterface.SIGN_ALGORITHM));
}
 

public final SignedObject getSignedRegistrationKey() {
	return signed_registration_key;
}
 

public static void main(String args[]) throws Exception {
    KeyPairGenerator kg = KeyPairGenerator.getInstance(DSA);
    kg.initialize(KEY_SIZE);
    KeyPair kp = kg.genKeyPair();

    Signature signature = Signature.getInstance(DSA);
    Test original = new Test();
    SignedObject so = new SignedObject(original, kp.getPrivate(),
            signature);
    System.out.println("Signature algorithm: " + so.getAlgorithm());

    signature = Signature.getInstance(DSA, "SUN");
    if (!so.verify(kp.getPublic(), signature)) {
        throw new RuntimeException("Verification failed");
    }

    kg = KeyPairGenerator.getInstance(DSA);
    kg.initialize(KEY_SIZE);
    kp = kg.genKeyPair();

    if (so.verify(kp.getPublic(), signature)) {
        throw new RuntimeException("Unexpected success");
    }

    Object copy = so.getObject();
    if (!original.equals(copy)) {
        throw new RuntimeException("Signed object is not equal "
                + "to original one: " + copy);
    }

    /*
     * The signed object is a copy of an original one.
     * Once the copy is made, further manipulation
     * of the original object shouldn't has any effect on the copy.
     */
    original.set(MAGIC - 1);
    copy = so.getObject();
    if (original.equals(copy)) {
        throw new RuntimeException("Signed object is not a copy "
                + "of original one: " + copy);
    }

    System.out.println("Test passed");
}
 

public static void main(String args[]) throws Exception {
    KeyPairGenerator kg = KeyPairGenerator.getInstance(DSA);
    kg.initialize(KEY_SIZE);
    KeyPair kp = kg.genKeyPair();

    Signature signature = Signature.getInstance(DSA);
    Test original = new Test();
    SignedObject so = new SignedObject(original, kp.getPrivate(),
            signature);
    System.out.println("Signature algorithm: " + so.getAlgorithm());

    signature = Signature.getInstance(DSA, "SUN");
    if (!so.verify(kp.getPublic(), signature)) {
        throw new RuntimeException("Verification failed");
    }

    kg = KeyPairGenerator.getInstance(DSA);
    kg.initialize(KEY_SIZE);
    kp = kg.genKeyPair();

    if (so.verify(kp.getPublic(), signature)) {
        throw new RuntimeException("Unexpected success");
    }

    Object copy = so.getObject();
    if (!original.equals(copy)) {
        throw new RuntimeException("Signed object is not equal "
                + "to original one: " + copy);
    }

    /*
     * The signed object is a copy of an original one.
     * Once the copy is made, further manipulation
     * of the original object shouldn't has any effect on the copy.
     */
    original.set(MAGIC - 1);
    copy = so.getObject();
    if (original.equals(copy)) {
        throw new RuntimeException("Signed object is not a copy "
                + "of original one: " + copy);
    }

    System.out.println("Test passed");
}
 

public static void main(String args[]) throws Exception {
    KeyPairGenerator kg = KeyPairGenerator.getInstance(DSA);
    kg.initialize(KEY_SIZE);
    KeyPair kp = kg.genKeyPair();

    Signature signature = Signature.getInstance(DSA);
    Test original = new Test();
    SignedObject so = new SignedObject(original, kp.getPrivate(),
            signature);
    System.out.println("Signature algorithm: " + so.getAlgorithm());

    signature = Signature.getInstance(DSA, "SUN");
    if (!so.verify(kp.getPublic(), signature)) {
        throw new RuntimeException("Verification failed");
    }

    kg = KeyPairGenerator.getInstance(DSA);
    kg.initialize(KEY_SIZE);
    kp = kg.genKeyPair();

    if (so.verify(kp.getPublic(), signature)) {
        throw new RuntimeException("Unexpected success");
    }

    Object copy = so.getObject();
    if (!original.equals(copy)) {
        throw new RuntimeException("Signed object is not equal "
                + "to original one: " + copy);
    }

    /*
     * The signed object is a copy of an original one.
     * Once the copy is made, further manipulation
     * of the original object shouldn't has any effect on the copy.
     */
    original.set(MAGIC - 1);
    copy = so.getObject();
    if (original.equals(copy)) {
        throw new RuntimeException("Signed object is not a copy "
                + "of original one: " + copy);
    }

    System.out.println("Test passed");
}
 

/**
 * Get the quantity of stored collect information
 * @param regency Regency to be considered
 * @return quantity of stored collect information for given regency
 */
public int getCollectsSize(int regency) {

    HashSet<SignedObject> c = collects.get(regency);
    return c == null ? 0 : c.size();
}
 

public static void main(String args[]) throws Exception {
    KeyPairGenerator kg = KeyPairGenerator.getInstance(DSA);
    kg.initialize(KEY_SIZE);
    KeyPair kp = kg.genKeyPair();

    Signature signature = Signature.getInstance(DSA);
    Test original = new Test();
    SignedObject so = new SignedObject(original, kp.getPrivate(),
            signature);
    System.out.println("Signature algorithm: " + so.getAlgorithm());

    signature = Signature.getInstance(DSA, "SUN");
    if (!so.verify(kp.getPublic(), signature)) {
        throw new RuntimeException("Verification failed");
    }

    kg = KeyPairGenerator.getInstance(DSA);
    kg.initialize(KEY_SIZE);
    kp = kg.genKeyPair();

    if (so.verify(kp.getPublic(), signature)) {
        throw new RuntimeException("Unexpected success");
    }

    Object copy = so.getObject();
    if (!original.equals(copy)) {
        throw new RuntimeException("Signed object is not equal "
                + "to original one: " + copy);
    }

    /*
     * The signed object is a copy of an original one.
     * Once the copy is made, further manipulation
     * of the original object shouldn't has any effect on the copy.
     */
    original.set(MAGIC - 1);
    copy = so.getObject();
    if (original.equals(copy)) {
        throw new RuntimeException("Signed object is not a copy "
                + "of original one: " + copy);
    }

    System.out.println("Test passed");
}
 

public static void main(String args[]) throws Exception {
    KeyPairGenerator kg = KeyPairGenerator.getInstance(DSA);
    kg.initialize(KEY_SIZE);
    KeyPair kp = kg.genKeyPair();

    Signature signature = Signature.getInstance(DSA);
    Test original = new Test();
    SignedObject so = new SignedObject(original, kp.getPrivate(),
            signature);
    System.out.println("Signature algorithm: " + so.getAlgorithm());

    signature = Signature.getInstance(DSA, "SUN");
    if (!so.verify(kp.getPublic(), signature)) {
        throw new RuntimeException("Verification failed");
    }

    kg = KeyPairGenerator.getInstance(DSA);
    kg.initialize(KEY_SIZE);
    kp = kg.genKeyPair();

    if (so.verify(kp.getPublic(), signature)) {
        throw new RuntimeException("Unexpected success");
    }

    Object copy = so.getObject();
    if (!original.equals(copy)) {
        throw new RuntimeException("Signed object is not equal "
                + "to original one: " + copy);
    }

    /*
     * The signed object is a copy of an original one.
     * Once the copy is made, further manipulation
     * of the original object shouldn't has any effect on the copy.
     */
    original.set(MAGIC - 1);
    copy = so.getObject();
    if (original.equals(copy)) {
        throw new RuntimeException("Signed object is not a copy "
                + "of original one: " + copy);
    }

    System.out.println("Test passed");
}