gistfile1.java

package com.mysite.aes;

import javax.crypto.*;
import javax.crypto.spec.*;

public class AES {
	static String key = "Z7Y74jNe43F3o15T"; // must be 16-bytes
	static String iv =  "P0LrHf3nkBo7z46f";
	
	public static String Encrypt(String stringToEncrypt) {
		String stringTmp = stringToEncrypt.trim();
		byte[] encrypted = null;
		
		try {
			SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
			IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes("UTF8"));
			
			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
			cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
			encrypted = cipher.doFinal(stringTmp.getBytes("UTF8"));
		}catch (Exception e) {}
		
		return bytesToHex(encrypted);	
	}
	
	public static String Decrypt(String stringToDecrypt) {
		String stringTmp = stringToDecrypt.trim();
		byte[] outText = null;
		
		try {
		    SecretKeySpec keySpec = new SecretKeySpec(key.getBytes("UTF8"), "AES");
		    IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes("UTF8"));
			
			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
		    cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
		    outText = cipher.doFinal(hexToBytes(stringTmp));
		} catch (Exception e) {}

	    return new String(outText).trim();	
	}
	
	public static String bytesToHex(byte[] data) {
		if (data==null) {
			 return null;
		} else {
			int len = data.length;
			String str = "";
			for (int i=0; i<len; i++) {
				if ((data[i]&0xFF)<16) {
					str = str + "0" + java.lang.Integer.toHexString(data[i]&0xFF);
				} else {
					str = str + java.lang.Integer.toHexString(data[i]&0xFF);
				}
			}
			return str;
		}
	}
	
	public static byte[] hexToBytes(String str) {
		if (str==null) {
			return null;
		} else if (str.length() < 2) {
			return null;
		} else {
			int len = str.length() / 2;
			byte[] buffer = new byte[len];
			for (int i=0; i<len; i++) {
				buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
			}
			return buffer;
		}
	}	
}