Java AES Encryption & Decryption

aes.java

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.util.Arrays;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import javax.print.DocFlavor.STRING;

import org.apache.commons.codec.binary.Base64;



public class AES {


 private static SecretKeySpec secretKey;
 private static byte[] key;

 private static String decryptedString;
 private static String encryptedString;


 public static void setKey(String myKey) {


  MessageDigest sha = null;
  try {
   key = myKey.getBytes("UTF-8");
   System.out.println(key.length);
   sha = MessageDigest.getInstance("SHA-1");
   key = sha.digest(key);
   key = Arrays.copyOf(key, 16); // use only first 128 bit
   System.out.println(key.length);
   System.out.println(new String(key, "UTF-8"));
   secretKey = new SecretKeySpec(key, "AES");


  } catch (NoSuchAlgorithmException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (UnsupportedEncodingException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }




 }

 public static String getDecryptedString() {
  return decryptedString;
 }

 public static void setDecryptedString(String decryptedString) {
  AES.decryptedString = decryptedString;
 }

 public static String getEncryptedString() {
  return encryptedString;
 }

 public static void setEncryptedString(String encryptedString) {
  AES.encryptedString = encryptedString;
 }

 public static String encrypt(String strToEncrypt) {
  try {
   Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

   cipher.init(Cipher.ENCRYPT_MODE, secretKey);


   setEncryptedString(Base64.encodeBase64String(cipher.doFinal(strToEncrypt.getBytes("UTF-8"))));

  } catch (Exception e) {

   System.out.println("Error while encrypting: " + e.toString());
  }
  return null;

 }

 public static String decrypt(String strToDecrypt) {
  try {
   Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");

   cipher.init(Cipher.DECRYPT_MODE, secretKey);
   setDecryptedString(new String(cipher.doFinal(Base64.decodeBase64(strToDecrypt))));

  } catch (Exception e) {

   System.out.println("Error while decrypting: " + e.toString());

  }
  return null;
 }


 public static void main(String args[]) {

  final String strToEncrypt = "My text to encrypt";
  final String strPssword = "secret key";
  AES.setKey(strPssword);

  AES.encrypt(strToEncrypt.trim());

  System.out.println("String to Encrypt: " + strToEncrypt);
  System.out.println("Encrypted: " + AES.getEncryptedString());

  final String strToDecrypt = AES.getEncryptedString();
  AES.decrypt(strToDecrypt.trim());

  System.out.println("String To Decrypt : " + strToDecrypt);
  System.out.println("Decrypted : " + AES.getDecryptedString());

 }

}