<pre name="code" class="plain"><span style="font-family:Microsoft YaHei;font-size:18px;">前面写了经常使用了MD5加密算法。一个肯定不能满足本屌丝的胃口，近期发现AES加密算法貌似挺牛逼的样子。还是是美国联邦政府採用的一种区块高级加密标准。一看到“高级”就把我吓尿了，果然牛逼，废话少说，先学会用再说。

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/**

  * @param

  * @return AES加密算法加密

  * @throws Exception

  */

 public static String encrypt(String seed, String cleartext)

   throws Exception {

  byte[] rawKey = getRawKey(seed.getBytes());

  byte[] result = encrypt(rawKey, cleartext.getBytes());

  return toHex(result);

 }

 /**

  * @param

  * @return AES加密算法加密

  * @throws Exception

  */

 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 String toHex(byte[] buf) {

  final String HEX = "0123456789ABCDEF";

  if (buf == null)

   return "";

  StringBuffer result = new StringBuffer(2 * buf.length);

  for (int i = 0; i < buf.length; i++) {

   result.append(HEX.charAt((buf[i] >> 4) & 0x0f)).append(

     HEX.charAt(buf[i] & 0x0f));

  }

  return result.toString();

 }

 /**

  * @param raw

  * @param encrypted

  * @return AES加密算法解密

  * @throws Exception

  */

 public static String decrypt(String seed, String encrypted)

   throws Exception {

  byte[] rawKey = getRawKey(seed.getBytes());

  byte[] enc = toByte(encrypted);

  byte[] result = decrypt(rawKey, enc);

  return new String(result);

 }

 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;

 }

 private static byte[] toByte(String hexString) {

  int len = hexString.length() / 2;

  byte[] result = new byte[len];

  for (int i = 0; i < len; i++)

   result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2),

     16).byteValue();

  return result;

 }

 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();

  byte[] raw = skey.getEncoded();

  return raw;

 }

<span style="font-family:Courier New;font-size:18px;">        String masterPassword = "test";

        String originalText = "0123456789";

        String encryptingCode = SimpleCrypto.encrypt(masterPassword,originalText);

        Log.i("加密结果为 ",encryptingCode);

        String decryptingCode = SimpleCrypto.decrypt(masterPassword, encryptingCode);

        Log.i("解密结果",decryptingCode);  </span>