util.SecurityUtil.java
package util; import java.security.Key; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class SecurityUtil { public static String DES = "AES"; // optional value AES/DES/DESede public static String CIPHER_ALGORITHM = "AES"; // optional value AES/DES/DESede public static Key getSecretKey(String key) throws Exception{ SecretKey securekey = null; if(key == null){ key = ""; } KeyGenerator keyGenerator = KeyGenerator.getInstance(DES); keyGenerator.init(new SecureRandom(key.getBytes())); securekey = keyGenerator.generateKey(); return securekey; } public static String encrypt(String data,String key) throws Exception { SecureRandom sr = new SecureRandom(); Key securekey = getSecretKey(key); Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM); cipher.init(Cipher.ENCRYPT_MODE, securekey, sr); byte[] bt = cipher.doFinal(data.getBytes()); String strs = new BASE64Encoder().encode(bt); return strs; } public static String detrypt(String message,String key) throws Exception{ SecureRandom sr = new SecureRandom(); Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM); Key securekey = getSecretKey(key); cipher.init(Cipher.DECRYPT_MODE, securekey,sr); byte[] res = new BASE64Decoder().decodeBuffer(message); res = cipher.doFinal(res); return new String(res); } public static void main(String[] args)throws Exception{ String message = "password"; String key = ""; String entryptedMsg = encrypt(message,key); System.out.println("encrypted message is below :"); System.out.println(entryptedMsg); String decryptedMsg = detrypt(entryptedMsg,key); System.out.println("decrypted message is below :"); System.out.println(decryptedMsg); } }