Key generation using AES Symmetric key Algorithm

Description

AESKeyGeneration.java generates the sysmetric key using AES algorithm. Key size assigned here is 128 bits. It works for key size of 192 and 256 bits also by adding secuirty related files to jre1.6.0\lib\security folder.

  • Filename: AESKeyGeneration.java

import javax.swing.*;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.util.Random ;
class AESKeyGeneration {
byte[] skey = new byte[1000];
String skeyString;
static byte[] raw;

public AESKeyGeneration() {
generateSymmetricKey();
}
void generateSymmetricKey() {
try {
Random r = new Random();
int num = r.nextInt(10000);
String knum = String.valueOf(num);
byte[] knumb = knum.getBytes();
skey=getRawKey(knumb);
skeyString = new String(skey);
System.out.println("AES Symmetric key = "+skeyString);
}
catch(Exception e) {
System.out.println(e);
}
}
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();
raw = skey.getEncoded();
return raw;
}
public byte[] getSessionKey() {
return raw;
}
public static void main(String args[]) {
AESKeyGeneration aeskey = new AESKeyGeneration();
}
}