Artikel ini adalah pembukaan dari seri artikel tentang NS-3 (berdasarkan pengalaman yang pernah dilakukan). Seri dimulai dari tahapan yang paling mudah dulu, kemudian secara bertahap akan dilakukan peningkatan sedikit demi sedikit.
NS-3 berdasarkan NS-3 tutorial adalah sebuah simulator jaringan berbasis discrete-event yang ditujukan terutama untuk penggunaan di penelitian dan pendidikan. NS-3 bersifat open source dan bukan pengembangan dari pendahulunya, NS-2, akan tetapi merupakan simulator yang baru.
Berikut adalah daftar artikel yang akan coba diterbitkan pada blog ini.
1. Instalasi dan build NS-3
2. Menjalankan script baru di NS-3
Abdi Wahab
nang's blog, just open everything here
Minggu, 08 Oktober 2017
Selasa, 06 Juni 2017
Energy Efficiency and Loss of Transmission Data on Wireless Sensor Network with Obstacle
Abdi
Wahab*, Fandi Ali Mustika*,
Rizal Broer Bahaweres+,
Deny Setiawan*, Mudrik Alaydrus*
The
growth of Wireless Sensor Network (WSN) in the late years, encourages
a lot of research in it. The most investigated
topics are energy consumption, coverage, and connectivity in WSN.
This paper discusses connectivity for WSN
with the presence of simple obstacles. The
LEACH protocol is used and is
modified based on the
obstacle, to improve the clustering process. We propose an algorithm
based on the intersection of line to improve the original
LEACH. The result of simulation shown the modified
LEACH algorithm works
better than the original LEACH with the
presence of obstacle based on energy consumption and loss of
transmission data. The future work could be done to modify the LEACH
for arbitrary obstacle.
Keywords—LEACH;
Obstacle; WSN
Sabtu, 11 Oktober 2014
Perbandingan QoS VoIP pada Jaringan Ad hoc dengan Protokol AODV dan AOMDV
Abdi Wahab1, Mudrik Alaydrus2
1,2 Magister Teknik Elektro, Program Paska Sarjana, Universitas Mercu Buana
nangdul56@gmail.com, mudrikalaydrus@yahoo.com
Abstract — The Cheap of VoIP technology, it simplify to used to build a media communication when the emergency held. VoIP can run on less infrastructure network, which is ad hoc network. In this research will try to calculate QoS on VoIP running on ad hoc network and uses AODV and AOMDV routing protocol. Two simulation will be build with NS-2, and the all the VoIP simulation will be used on hop scenario. The result obtain from the simulation shows that from chosen of the three QoS parameters, there’s only a few differences in delay, meanwhile for the two QoS parameters there is no big differences, even tend to be a same value. It’s more better to to make simulation with multi hop for the next research.
Keyword — VoIP, ad hoc network, AODV, AOMDV
Abstrak — Teknologi VoIP yang murah, memudahkan untuk digunakan ketika diperlukan media komunikasi dalam keadaan darurat. VoIP bisa berjalan di jaringan less infrastructure, salah satunya jaringan ad hoc. Pada penilitian ini akan coba dihitung QoS pada jaringan VoIP yang berjalan pada ad hoc dan menggunakan protokol routing AODV, dan AOMDV. Dua buah simulasi akan dibuat menggunakan NS-2 dan seluruh simulasi VoIP akan dibuat untuk skenario 1 hop saja. Hasil yang didapatkan dari simulasi menunjukkan bahwa dari ketiga parameter QoS yang diambil, hanya terjadi sedikit perbedaan delay, sedangkan dua parameter yang lain tidak terjadi perbedaan besar, bahkan cenderung memiliki nilai yang sama. Akan lebih baik lagi jika dibuat simulasi dengan multi hop untuk penelitian selanjutnya.
Kata kunci — VoIP, jaringan ad hoc, AODV, AOMDV
Senin, 23 Desember 2013
Developing VMS (Vessel Monitoring System) For IMACS in Lombok
A few weeks a go, exactly on December 10 until December 12, I went to Lombok to testing VMS application I've developed. One of my task is testing and trying the VMS apps for real testing on board or vessel. This project is from IMACS USAID, because they want give this application to DKP Lombok for monitoring vessel under 30 GT. Because there's no regulation for monitoring vessel under 30 GT.
It was very interesting experience, because that the first time I land my feet on NTB, and the first time testing real GPS devices on vessel board. May be I'll tell a lot about application in the next post. And here is the boat I used to try the apps and GPS.
Hee... May be in January, I'll go back to Lombok to present elogbook apps.
It was very interesting experience, because that the first time I land my feet on NTB, and the first time testing real GPS devices on vessel board. May be I'll tell a lot about application in the next post. And here is the boat I used to try the apps and GPS.
Hee... May be in January, I'll go back to Lombok to present elogbook apps.
Minggu, 14 April 2013
Car Rental Application with SMS Gateway
Ok, in this post I'll show my project with my friend, Hendri, for building a car rental
application with sms gateway integrated. In this application, user can reserve a car via sms, but the user must be registered first at office.
This is the screen shoot of application.
That's the first screen of application. I'll complete it later. If you interest with this app, don't hesitate to contact me.
application with sms gateway integrated. In this application, user can reserve a car via sms, but the user must be registered first at office.
This is the screen shoot of application.
That's the first screen of application. I'll complete it later. If you interest with this app, don't hesitate to contact me.
Label:
Car Rental,
Java,
Open Source,
Research,
SMS Gateway
Senin, 05 November 2012
Simple Temperature Conversion Apps for Android (Aplikasi Konversi Suhu Sederhana untuk Android)
Ok, in this post, I'll post a simple apps for conversion of temperature. This apps for only Android phone. And this is the capture of the application.
In this apps, I use spinner to add dropdown box like in a website. Ok, to make this app, so these are the codes you need to write.
First of all is main activity layout, I named it activity_conversion.xml. It's look like this:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="20dp"
android:layout_marginTop="14dp"
android:text="@string/hello_world"
tools:context=".ConversionActivity" />
<Spinner
android:id="@+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="16dp" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/spinner1"
android:layout_below="@+id/spinner1"
android:layout_marginTop="20dp"
android:text="@string/hello2" />
<Spinner
android:id="@+id/spinner2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView2"
android:layout_below="@+id/textView2"
android:layout_marginTop="22dp" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/spinner2"
android:layout_below="@+id/spinner2"
android:layout_marginTop="14dp"
android:text="@string/insert_temp" />
<EditText
android:id="@+id/insert_editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView3"
android:layout_below="@+id/textView3"
android:layout_marginTop="20dp"
android:ems="10" />
<Button
android:id="@+id/convert_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/insert_editText"
android:layout_below="@+id/insert_editText"
android:text="@string/convert_button" />
<EditText
android:id="@+id/result_editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/convert_button"
android:layout_alignParentBottom="true"
android:layout_marginBottom="20dp"
android:ems="10" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/result_editText"
android:layout_alignLeft="@+id/result_editText"
android:layout_marginBottom="22dp"
android:text="@string/result" />
</RelativeLayout>
And for the second is strings.xml. Here it's the code for strings.xml:
<resources>
<string name="app_name">TempConversion</string>
<string name="hello_world">Choose your temperature from</string>
<string name="menu_settings">Settings</string>
<string name="title_activity_conversion">ConversionActivity</string>
<string name="hello2">Conversion to</string>
<string name="insert_temp">Insert your temperature</string>
<string name="result">The result is</string>
<string name="convert_button">Convert</string>
<string-array name="nama_suhu">
<item>Celcius</item>
<item>Fahrenheit</item>
<item>Kelvin</item>
<item>Reamur</item>
</string-array>
<string-array name="nama_suhu2">
<item>Celcius</item>
<item>Fahrenheit</item>
<item>Kelvin</item>
<item>Reamur</item>
</string-array>
</resources>
Next is the main activity, I named it with ConversionActivity.java. And the codes are:
package org.tempconversion;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
public class ConversionActivity extends Activity implements OnItemSelectedListener{
//private String suhu1, suhu2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_conversion);
final Spinner pilTemp1 = (Spinner)findViewById(R.id.spinner1);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.nama_suhu, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
pilTemp1.setAdapter(adapter);
final Spinner pilTemp2 = (Spinner)findViewById(R.id.spinner2);
ArrayAdapter<CharSequence> adapter2 = ArrayAdapter.createFromResource(this, R.array.nama_suhu2, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
pilTemp2.setAdapter(adapter2);
final EditText inputTemp = (EditText)findViewById(R.id.insert_editText);
final EditText resultTemp = (EditText)findViewById(R.id.result_editText);
final Button convertButton = (Button)findViewById(R.id.convert_button);
// event for button
convertButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
String suhu1 = pilTemp1.getSelectedItem().toString();
String suhu2 = pilTemp2.getSelectedItem().toString();
String strSuhu = inputTemp.getText().toString();
String strSuhuAkhir = "";
double suhuAwal = Double.parseDouble(strSuhu);
double suhuResult = 0;
// selection for converting suhu
// start with Celcius first
if(suhu1.equals("Celcius")) {
if(suhu2.equals("Fahrenheit")) {
suhuResult = (suhuAwal * 9 / 5) + 32;
} else if(suhu2.equals("Kelvin")) {
suhuResult = suhuAwal + 273;
} else if(suhu2.equals("Reamur")) {
suhuResult = suhuAwal * 4 / 5;
} else {
suhuResult = suhuAwal;
}
} else if(suhu1.equals("Fahrenheit")) {
if(suhu2.equals("Celcius")) {
suhuResult = (suhuAwal - 32) * 5 / 9;
} else if(suhu2.equals("Kelvin")) {
suhuResult = (suhuAwal - 459) * 5 / 9;
} else if(suhu2.equals("Reamur")) {
suhuResult = (suhuAwal - 32) * 4 / 9;
} else {
suhuResult = suhuAwal;
}
} else if(suhu1.equals("Kelvin")) {
if(suhu2.equals("Celcius")) {
suhuResult = suhuAwal - 273;
} else if(suhu2.equals("Fahrenheit")) {
suhuResult = suhuAwal * 9 / 5 - 459;
} else if(suhu2.equals("Reamur")) {
suhuResult = (suhuAwal - 273) * 4 / 5;
} else {
suhuResult = suhuAwal;
}
} else if(suhu1.equals("Reamur")) {
if(suhu2.equals("Celcius")) {
suhuResult = suhuAwal * 5 / 4;
} else if(suhu2.equals("Kelvin")) {
suhuResult = suhuAwal * 5 / 4 + 273;
} else if(suhu2.equals("Fahrenheit")) {
suhuResult = suhuAwal * 9 / 4 + 32;
} else {
suhuResult = suhuAwal;
}
}
strSuhuAkhir = Double.toString(suhuResult);
resultTemp.setText(strSuhuAkhir);
}
});
}
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
// An item was selected. You can retrieve the selected item using
// parent.getItemAtPosition(pos)
}
public void onNothingSelected(AdapterView<?> parent) {
// Another interface callback
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_conversion, menu);
return true;
}
}
Ok, that's all for sharing today. Happy coding and go open source.
In this apps, I use spinner to add dropdown box like in a website. Ok, to make this app, so these are the codes you need to write.
First of all is main activity layout, I named it activity_conversion.xml. It's look like this:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="20dp"
android:layout_marginTop="14dp"
android:text="@string/hello_world"
tools:context=".ConversionActivity" />
<Spinner
android:id="@+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="16dp" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/spinner1"
android:layout_below="@+id/spinner1"
android:layout_marginTop="20dp"
android:text="@string/hello2" />
<Spinner
android:id="@+id/spinner2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView2"
android:layout_below="@+id/textView2"
android:layout_marginTop="22dp" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/spinner2"
android:layout_below="@+id/spinner2"
android:layout_marginTop="14dp"
android:text="@string/insert_temp" />
<EditText
android:id="@+id/insert_editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView3"
android:layout_below="@+id/textView3"
android:layout_marginTop="20dp"
android:ems="10" />
<Button
android:id="@+id/convert_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/insert_editText"
android:layout_below="@+id/insert_editText"
android:text="@string/convert_button" />
<EditText
android:id="@+id/result_editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/convert_button"
android:layout_alignParentBottom="true"
android:layout_marginBottom="20dp"
android:ems="10" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/result_editText"
android:layout_alignLeft="@+id/result_editText"
android:layout_marginBottom="22dp"
android:text="@string/result" />
</RelativeLayout>
And for the second is strings.xml. Here it's the code for strings.xml:
<resources>
<string name="app_name">TempConversion</string>
<string name="hello_world">Choose your temperature from</string>
<string name="menu_settings">Settings</string>
<string name="title_activity_conversion">ConversionActivity</string>
<string name="hello2">Conversion to</string>
<string name="insert_temp">Insert your temperature</string>
<string name="result">The result is</string>
<string name="convert_button">Convert</string>
<string-array name="nama_suhu">
<item>Celcius</item>
<item>Fahrenheit</item>
<item>Kelvin</item>
<item>Reamur</item>
</string-array>
<string-array name="nama_suhu2">
<item>Celcius</item>
<item>Fahrenheit</item>
<item>Kelvin</item>
<item>Reamur</item>
</string-array>
</resources>
Next is the main activity, I named it with ConversionActivity.java. And the codes are:
package org.tempconversion;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
public class ConversionActivity extends Activity implements OnItemSelectedListener{
//private String suhu1, suhu2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_conversion);
final Spinner pilTemp1 = (Spinner)findViewById(R.id.spinner1);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.nama_suhu, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
pilTemp1.setAdapter(adapter);
final Spinner pilTemp2 = (Spinner)findViewById(R.id.spinner2);
ArrayAdapter<CharSequence> adapter2 = ArrayAdapter.createFromResource(this, R.array.nama_suhu2, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
pilTemp2.setAdapter(adapter2);
final EditText inputTemp = (EditText)findViewById(R.id.insert_editText);
final EditText resultTemp = (EditText)findViewById(R.id.result_editText);
final Button convertButton = (Button)findViewById(R.id.convert_button);
// event for button
convertButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
String suhu1 = pilTemp1.getSelectedItem().toString();
String suhu2 = pilTemp2.getSelectedItem().toString();
String strSuhu = inputTemp.getText().toString();
String strSuhuAkhir = "";
double suhuAwal = Double.parseDouble(strSuhu);
double suhuResult = 0;
// selection for converting suhu
// start with Celcius first
if(suhu1.equals("Celcius")) {
if(suhu2.equals("Fahrenheit")) {
suhuResult = (suhuAwal * 9 / 5) + 32;
} else if(suhu2.equals("Kelvin")) {
suhuResult = suhuAwal + 273;
} else if(suhu2.equals("Reamur")) {
suhuResult = suhuAwal * 4 / 5;
} else {
suhuResult = suhuAwal;
}
} else if(suhu1.equals("Fahrenheit")) {
if(suhu2.equals("Celcius")) {
suhuResult = (suhuAwal - 32) * 5 / 9;
} else if(suhu2.equals("Kelvin")) {
suhuResult = (suhuAwal - 459) * 5 / 9;
} else if(suhu2.equals("Reamur")) {
suhuResult = (suhuAwal - 32) * 4 / 9;
} else {
suhuResult = suhuAwal;
}
} else if(suhu1.equals("Kelvin")) {
if(suhu2.equals("Celcius")) {
suhuResult = suhuAwal - 273;
} else if(suhu2.equals("Fahrenheit")) {
suhuResult = suhuAwal * 9 / 5 - 459;
} else if(suhu2.equals("Reamur")) {
suhuResult = (suhuAwal - 273) * 4 / 5;
} else {
suhuResult = suhuAwal;
}
} else if(suhu1.equals("Reamur")) {
if(suhu2.equals("Celcius")) {
suhuResult = suhuAwal * 5 / 4;
} else if(suhu2.equals("Kelvin")) {
suhuResult = suhuAwal * 5 / 4 + 273;
} else if(suhu2.equals("Fahrenheit")) {
suhuResult = suhuAwal * 9 / 4 + 32;
} else {
suhuResult = suhuAwal;
}
}
strSuhuAkhir = Double.toString(suhuResult);
resultTemp.setText(strSuhuAkhir);
}
});
}
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
// An item was selected. You can retrieve the selected item using
// parent.getItemAtPosition(pos)
}
public void onNothingSelected(AdapterView<?> parent) {
// Another interface callback
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_conversion, menu);
return true;
}
}
Ok, that's all for sharing today. Happy coding and go open source.
Rabu, 17 Oktober 2012
Simple Encryption Aplications Using AES and MD5 ( Aplikasi Enkripsi Sederhana Menggunakan AES dan MD5 )
Ok, this time I'll share about simple apps for encryption using AES and MD5. I try to combine AES with MD5. The string will be encrypted with AES first, and then the cipher text will be encrypted again with MD5. So, this is the capture of the applications.
The first field is for key encryption, and the second field is for the teks to be encrypted.
To create this app, I use 3 classes. The first class is an activity called AesMd5.java, GenerateAes.java, Md5Baru.java.
For the source code to create this simple apps I'll show below.
The first is
AesMd5.java
package org.aesmd5;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.*;
import android.widget.Button;
import android.widget.EditText;
public class AesMd5 extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_aes_md5);
final Button enkripButton = (Button)findViewById(R.id.enkrip_button);
final EditText inputKunci = (EditText)findViewById(R.id.input_kunci);
final EditText inputKata = (EditText)findViewById(R.id.input_kata);
final EditText teksEnkrip = (EditText)findViewById(R.id.teks_enkrip);
// handling for Encryption
enkripButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
String ambilKunci = inputKunci.getText().toString();
String ambilKata = inputKata.getText().toString();
String enKata = "";
try {
enKata = GenerateAES.encrypt(ambilKunci, ambilKata);
} catch (Exception e) {
e.printStackTrace();
}
//teksEnkrip.setText(enKata);
teksEnkrip.setText(Md5Baru.MD5(enKata));
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_aes_md5, menu);
return true;
}
}
GenerateAes.java
package org.aesmd5;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.SecureRandom;
public class GenerateAES {
//private Cipher cipher;
//private SecretKeySpec sKey;
public GenerateAES() {
}
public static String encrypt(String seed, String cleartext) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = encrypt(rawKey, cleartext.getBytes());
return toHex(result);
}
public static String decrypt(String seed, String encrypted) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] enc = toByte(encrypted);
byte[] result = decrypt(rawKey, enc);
return new String(result);
}
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(seed);
kgen.init(128, sr); // 192 and 256 bits may not be available
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
public static String toHex(String txt) {
return toHex(txt.getBytes());
}
public static byte[] toByte(String hexString) {
int len = hexString.length()/2;
byte[] result = new byte[len];
for (int i = 0; i < len; i++)
result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).byteValue();
return result;
}
public static String toHex(byte[] buf) {
if (buf == null)
return "";
StringBuffer result = new StringBuffer(2*buf.length);
for (int i = 0; i < buf.length; i++) {
appendHex(result, buf[i]);
}
return result.toString();
}
private final static String HEX = "0123456789ABCDEF";
private static void appendHex(StringBuffer sb, byte b) {
sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f));
}
}
Md5Baru.java
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package org.aesmd5;
import java.security.*;
/**
*
* @author nang
*/
public class Md5Baru {
public static String MD5(String text) {
String md5 = "";
byte test[] = text.getBytes();
int panjang = 16;
byte[] mesDig = new byte[panjang];
try {
MessageDigest mD = MessageDigest.getInstance("MD5");
mD.reset();
mD.update(text.getBytes(), 0, text.length());
mD.digest(mesDig, 0, panjang);
StringBuffer sB = new StringBuffer();
for(int i=0; i<mesDig.length;i++) {
//mesDig = mD.digest(test, 0, test.length);
String hex = Integer.toHexString(0xFF & mesDig[i]);
if(hex.length() == 1) {
sB.append('0');
}
sB.append(hex);
}
md5 = sB.toString();
} catch (Exception e){
}
return md5;
}
}
And the last is activity_aes_md5.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:id="@+id/teks_kunci"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Masukkan kunci"
/>
<EditText
android:id="@+id/input_kunci"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/teks_kata"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Masukkan kata"
/>
<EditText
android:id="@+id/input_kata"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<Button
android:id="@+id/enkrip_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Enkrip"
/>
<EditText
android:id="@+id/teks_enkrip"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
Ok, that's all for today, happy coding, and go Open Source.
The first field is for key encryption, and the second field is for the teks to be encrypted.
To create this app, I use 3 classes. The first class is an activity called AesMd5.java, GenerateAes.java, Md5Baru.java.
For the source code to create this simple apps I'll show below.
The first is
AesMd5.java
package org.aesmd5;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.*;
import android.widget.Button;
import android.widget.EditText;
public class AesMd5 extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_aes_md5);
final Button enkripButton = (Button)findViewById(R.id.enkrip_button);
final EditText inputKunci = (EditText)findViewById(R.id.input_kunci);
final EditText inputKata = (EditText)findViewById(R.id.input_kata);
final EditText teksEnkrip = (EditText)findViewById(R.id.teks_enkrip);
// handling for Encryption
enkripButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
String ambilKunci = inputKunci.getText().toString();
String ambilKata = inputKata.getText().toString();
String enKata = "";
try {
enKata = GenerateAES.encrypt(ambilKunci, ambilKata);
} catch (Exception e) {
e.printStackTrace();
}
//teksEnkrip.setText(enKata);
teksEnkrip.setText(Md5Baru.MD5(enKata));
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_aes_md5, menu);
return true;
}
}
GenerateAes.java
package org.aesmd5;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.SecureRandom;
public class GenerateAES {
//private Cipher cipher;
//private SecretKeySpec sKey;
public GenerateAES() {
}
public static String encrypt(String seed, String cleartext) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = encrypt(rawKey, cleartext.getBytes());
return toHex(result);
}
public static String decrypt(String seed, String encrypted) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] enc = toByte(encrypted);
byte[] result = decrypt(rawKey, enc);
return new String(result);
}
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(seed);
kgen.init(128, sr); // 192 and 256 bits may not be available
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
public static String toHex(String txt) {
return toHex(txt.getBytes());
}
public static byte[] toByte(String hexString) {
int len = hexString.length()/2;
byte[] result = new byte[len];
for (int i = 0; i < len; i++)
result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).byteValue();
return result;
}
public static String toHex(byte[] buf) {
if (buf == null)
return "";
StringBuffer result = new StringBuffer(2*buf.length);
for (int i = 0; i < buf.length; i++) {
appendHex(result, buf[i]);
}
return result.toString();
}
private final static String HEX = "0123456789ABCDEF";
private static void appendHex(StringBuffer sb, byte b) {
sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f));
}
}
Md5Baru.java
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package org.aesmd5;
import java.security.*;
/**
*
* @author nang
*/
public class Md5Baru {
public static String MD5(String text) {
String md5 = "";
byte test[] = text.getBytes();
int panjang = 16;
byte[] mesDig = new byte[panjang];
try {
MessageDigest mD = MessageDigest.getInstance("MD5");
mD.reset();
mD.update(text.getBytes(), 0, text.length());
mD.digest(mesDig, 0, panjang);
StringBuffer sB = new StringBuffer();
for(int i=0; i<mesDig.length;i++) {
//mesDig = mD.digest(test, 0, test.length);
String hex = Integer.toHexString(0xFF & mesDig[i]);
if(hex.length() == 1) {
sB.append('0');
}
sB.append(hex);
}
md5 = sB.toString();
} catch (Exception e){
}
return md5;
}
}
And the last is activity_aes_md5.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:id="@+id/teks_kunci"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Masukkan kunci"
/>
<EditText
android:id="@+id/input_kunci"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/teks_kata"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Masukkan kata"
/>
<EditText
android:id="@+id/input_kata"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<Button
android:id="@+id/enkrip_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Enkrip"
/>
<EditText
android:id="@+id/teks_enkrip"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
Ok, that's all for today, happy coding, and go Open Source.
Label:
Android,
Java,
Mobile Application,
Open Source,
Security
Langganan:
Postingan (Atom)