密碼加密之類的用處，直接復制黏貼，可用

1.加密的代碼：

/// <summary>/// DEC 加密過程 /// </summary>/// <param name="pToEncrypt">要加密的字符串</param>/// <param name="sKey">密匙</param>/// <returns></returns> public static string Encrypt(string pToEncrypt, string sKey){DESCryptoServiceProvider des = new DESCryptoServiceProvider(); //把字符串放到byte數組中 byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); //建立加密對象的密鑰和偏移量 des.IV = ASCIIEncoding.ASCII.GetBytes(sKey); //原文使用ASCIIEncoding.ASCII方法的GetBytes方法 MemoryStream ms = new MemoryStream(); //使得輸入密碼必須輸入英文文本 CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();StringBuilder ret = new StringBuilder();foreach (byte b in ms.ToArray()){ret.AppendFormat("{0:X2}", b);}ret.ToString();return ret.ToString();}

2.解密的代碼

/// <summary>/// DEC 解密過程 /// </summary>/// <param name="pToDecrypt">要解密的字符串</param>/// <param name="sKey">密匙</param>/// <returns></returns>public static string Decrypt(string pToDecrypt, string sKey){DESCryptoServiceProvider des = new DESCryptoServiceProvider();byte[] inputByteArray = new byte[pToDecrypt.Length / 2];for (int x = 0; x < pToDecrypt.Length / 2; x++){int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));inputByteArray[x] = (byte)i;}des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); //建立加密對象的密鑰和偏移量，此值重要，不能修改 des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);MemoryStream ms = new MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();StringBuilder ret = new StringBuilder(); //建立StringBuild對象，CreateDecrypt使用的是流對象，必須把解密后的文本變成流對象 return System.Text.Encoding.Default.GetString(ms.ToArray());}

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轉載于:https://www.cnblogs.com/LJP-JumpAndFly/p/4824442.html

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