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  public class Encrypt    {        private static Encoding encoding = Encoding.Default;        public static string EncryptString(string originalStr)        {            return EncryptString(originalStr, "*&%$$FGad232f%^&&*()GTH$%3245gth", "@#%9286(^$jk$%#?", true);        }        private static string EncryptString(string originalStr, string key, string iv, bool returnBase64Code)        {            try            {                if (string.IsNullOrEmpty(originalStr) == false)                {                    byte[] sourcesBytes;                    byte[] originalBytes = encoding.GetBytes(originalStr);                    byte[] keyBytes = encoding.GetBytes(key);                    byte[] ivBytes = encoding.GetBytes(iv);                    using (MemoryStream ms = new MemoryStream(originalBytes.Length))                    {                        using (RijndaelManaged rm = new RijndaelManaged())                        {                            using (ICryptoTransform ic = rm.CreateEncryptor(keyBytes, ivBytes))                            {                                using (CryptoStream cs = new CryptoStream(ms, ic, CryptoStreamMode.Write))                                {                                    cs.Write(originalBytes, 0, originalBytes.Length);                                    cs.FlushFinalBlock();                                    sourcesBytes = ms.ToArray();                                }                            }                            rm.Clear();                        }                    }                    return (returnBase64Code ? Convert.ToBase64String(sourcesBytes) : encoding.GetString(sourcesBytes));                }            }            catch            {            }            return string.Empty;        }        public static string DecryptString(string targetStr)        {            return DecryptString(targetStr, "*&%$$FGad232f%^&&*()GTH$%3245gth", "@#%9286(^$jk$%#?", true);        }        private static string DecryptString(string targetstr, string key, string iv, bool returnBaseString)        {            try            {                byte[] targetBytes = (returnBaseString ? Convert.FromBase64String(targetstr) : encoding.GetBytes(targetstr));                byte[] sourcesBytes = new byte[targetBytes.Length];                byte[] keyBytes = encoding.GetBytes(key);                byte[] ivBytes = encoding.GetBytes(iv);                using (MemoryStream ms = new MemoryStream(targetBytes))                {                    using (RijndaelManaged rg = new RijndaelManaged())                    {                        using (ICryptoTransform ic = rg.CreateDecryptor(keyBytes, ivBytes))                        {                            using (CryptoStream cs = new CryptoStream(ms, ic, CryptoStreamMode.Read))                            {                                cs.Read(sourcesBytes, 0, sourcesBytes.Length);                            }                        }                        rg.Clear();                    }                }                return encoding.GetString(sourcesBytes).Trim(new char[] { '\0' });            }            catch            {            }            return string.Empty;        }        public static string MD5Encrpyt(string originalStr, bool toUpper)        {            try            {                if (string.IsNullOrEmpty(originalStr) == false)                {                    byte[] inputBytes = encoding.GetBytes(originalStr);                    MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();                    byte[] encryptBytes = md5.ComputeHash(inputBytes);                    md5.Clear();                    StringBuilder sb = new StringBuilder();                    for (int i = 0; i < encryptBytes.Length; i++)                    {                        sb.AppendFormat("{0:x2}", encryptBytes[i]);                    }                    return (toUpper ? sb.ToString().ToUpper() : sb.ToString());                }            }            catch            {            }            return string.Empty;        }        public static Encoding Encoding        {            get { return encoding; }            set { encoding = value; }        }    }
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