AES.rar_The Program

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 AES { byte[] skey = new byte[1000]; String skeyString; static byte[] raw; String inputMessage,encryptedData,decryptedMessage; public AES() { try { generateSymmetricKey(); inputMessage=JOptionPane.showInputDialog(null,"Enter message to encrypt"); byte[] ibyte = inputMessage.getBytes(); byte[] ebyte=encrypt(raw, ibyte); String encryptedData = new String(ebyte); System.out.println("Encrypted message "+encryptedData); JOptionPane.showMessageDialog(null,"Encrypted Data "+"\n"+encryptedData); byte[] dbyte= decrypt(raw,ebyte); String decryptedMessage = new String(dbyte); System.out.println("Decrypted message "+decryptedMessage); JOptionPane.showMessageDialog(null,"Decrypted Data "+"\n"+decryptedMessage); } catch(Exception e) { System.out.println(e); } } 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; } 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 void main(String args[]) { AES aes = new AES(); } }