Source Code Algoritma AES 128 Dalam Java
Dibawah ini merupakan source
code algoritma AES 128 menggunakan bahasa pemrograman java.
Disini inputan atau plainteks nya berupa string, untuk yang file akan saya
posting berikutnya. Source saya Run menggunakan Netbeans. Agar source dapat
dijalankan, download dulu "The Bouncy Castle Crypto package".
Selanjutkan tambahkan file .jar tersebut di Libraries.
Berikut source code nya :
package aes;
/**
*
* @author zae
*/
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class Main {
public static void main(String[] args) throws Exception {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
byte[] input = "tes".getBytes();
byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };
SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
System.out.println(new String(input));
// encryption pass
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
ctLength += cipher.doFinal(cipherText, ctLength);
System.out.println(new String(cipherText));
System.out.println(ctLength);
// decryption pass
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
ptLength += cipher.doFinal(plainText, ptLength);
System.out.println(new String(plainText));
System.out.println(ptLength);
}
}
/**
*
* @author zae
*/
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class Main {
public static void main(String[] args) throws Exception {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
byte[] input = "tes".getBytes();
byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };
SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
System.out.println(new String(input));
// encryption pass
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
ctLength += cipher.doFinal(cipherText, ctLength);
System.out.println(new String(cipherText));
System.out.println(ctLength);
// decryption pass
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
ptLength += cipher.doFinal(plainText, ptLength);
System.out.println(new String(plainText));
System.out.println(ptLength);
}
}
Penjelasan dari source code diatas
adalah
* Input berupa string, dalam kasus ini, saya meng-enkrip : "tes"
byte[]
input = "tes".getBytes();
*Kunci yang dipakai adalah
"123456789abcdef"
SecretKeySpec key =
new SecretKeySpec(keyBytes, "AES");
dimana keyBytes adalah array byte yang isinya kunci
byte[]
keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x09,0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };
* algoritma yang dipakai adalah AES,
dalam hal ini AES 128, karena kunci yang dipakai 128 bit
Cipher cipher =
Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
Setelah di Run maka
hasilnya sebagai berikut
run:
tes //output System.out.println(new String(input));
O�, qX(PNN�y � //output System.out.println(new String(cipherText));
16 //output System.out.println(ctLength);
tes //output System.out.println(new String(plainText));
tes //output System.out.println(new String(input));
O�, qX(PNN�y � //output System.out.println(new String(cipherText));
16 //output System.out.println(ctLength);
tes //output System.out.println(new String(plainText));
3
//output System.out.println(ptLength);
