1 public static string _KEY = "HQDCKEY1"; //密钥 2 public static string _IV = "HQDCKEY2"; //向量 3 4 /// <summary> 5 /// DES加密 6 /// </summary> 7 /// <param name="data"></param> 8 /// <returns></returns> 9 public static string Encode(string data) 10 { 11 12 byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(_KEY); 13 byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(_IV); 14 15 DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); 16 int i = cryptoProvider.KeySize; 17 MemoryStream ms = new MemoryStream(); 18 CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write); 19 20 StreamWriter sw = new StreamWriter(cst); 21 sw.Write(data); 22 sw.Flush(); 23 cst.FlushFinalBlock(); 24 sw.Flush(); 25 26 string strRet = Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length); 27 return strRet; 28 } 29 30 /// <summary> 31 /// DES解密 32 /// </summary> 33 /// <param name="data"></param> 34 /// <returns></returns> 35 public static string Decode(string data) 36 { 37 38 byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(_KEY); 39 byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(_IV); 40 41 byte[] byEnc; 42 43 try 44 { 45 data.Replace("_%_", "/"); 46 data.Replace("-%-", "#"); 47 byEnc = Convert.FromBase64String(data); 48 49 } 50 catch 51 { 52 return null; 53 } 54 55 DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); 56 MemoryStream ms = new MemoryStream(byEnc); 57 CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read); 58 StreamReader sr = new StreamReader(cst); 59 return sr.ReadToEnd(); 60 }