算法学习

//可传入key值的加密算法
public String encrypt(String src, String key)
        throws Exception
    {
        if (null == key || null == src)
        {
            return null;
        }
       
        byte[] raw = key.getBytes("ASCII");
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        byte[] encrypted = cipher.doFinal(src.getBytes());
       
        return TypeConvertUtil.byteTS(encrypted).toLowerCase();
       
    }
//对应解密算法
public  String decrypt(String src, String key)
        throws Exception
    {
        try
        {
            if (null == key || null == src)
            {
                return null;
            }
            byte[] raw = key.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            byte[] encrypted1 = TypeConvertUtil.sTByte(sSrc);
            try
            {
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original);
                return originalString;
            }
            catch (Exception e)
            {
                return null;
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }