[SHARE] Key Generator java

[Braincode]

Setelah Libur ane memutuskan untuk fokus lg di bidang programing...

hehe

di tengah jalan ane nemu ini nih


Code:


import java.security.Key;
import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class MainClass {
public static void main(String[] args) throws Exception {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider ());
byte[] input = "www.HAHAHIHI.com".getBytes();

byte[] ivBytes = new byte[] { 0x00, 0x00, 0x00, 0x01, 0x04, 0x05, 0x06, 0x07, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x01 };

Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
KeyGenerator generator = KeyGenerator.getInstance("AES", "BC");

generator.init(192);

Key encryptionKey = generator.generateKey();

System.out.println("key : " + Utils.toHex(encryptionKey.getEncoded()));
System.out.println("input : " + new String(input));

// encryption pass
cipher.init(Cipher.ENCRYPT_MODE, encryptionKey, new IvParameterSpec(ivBytes));
byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
ctLength += cipher.doFinal(cipherText, ctLength);

// decryption pass
Key decryptionKey = new SecretKeySpec(encryptionKey.getEncoded(), encryptionKey.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, decryptionKey, new IvParameterSpec(ivBytes));
byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
ptLength += cipher.doFinal(plainText, ptLength);
System.out.println("plain : " + new String(plainText) + " bytes: " + ptLength);
}
}


class Utils
{
private static String digits = "0123456789abcdef";


public static String toHex(byte[] data, int length)
{
StringBuffer buf = new StringBuffer();

for (int i = 0; i != length; i++)
{
int v = data[i] & 0xff;

buf.append(digits.charAt(v >> 4));
buf.append(digits.charAt(v & 0xf));
}

return buf.toString();
}


public static String toHex(byte[] data)
{
return toHex(data, data.length);
}
}

Untuk KEy Generator MAC


Code:

import java.security.Security;

import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;

public class MainClass {
public static void main(String args[]) throws Exception {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider ());
String inputString = "Stringnya disini";

KeyGenerator keyGen = KeyGenerator.getInstance("HmacMD5");
SecretKey secretKey = keyGen.generateKey();

Mac mac = Mac.getInstance(secretKey.getAlgorithm());
mac.init(secretKey);

byte[] byteData = inputString.getBytes("UTF8");

byte[] macBytes = mac.doFinal(byteData);

String macAsString = new sun.misc.BASE64Encoder().encode(macBytes);

System.out.println("Authentication code is: " + macAsString);
}
}

UNTUK ASYMETHRIC KEY




Code:

import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

public class Main {
public static void main(String[] argv) throws Exception {
// Generate a DES key
KeyGenerator keyGen = KeyGenerator.getInstance("DES");
SecretKey key = keyGen.generateKey();

// Generate a Blowfish key
keyGen = KeyGenerator.getInstance("Blowfish");
key = keyGen.generateKey();

// Generate a triple DES key
keyGen = KeyGenerator.getInstance("DESede");
key = keyGen.generateKey();
}
}

moga2 bisa ngebantu agan2 disini