C#加密與解密

標籤：

密碼加密之類的用處，直接複製黏貼，可用

1.加密的代碼：

        /// <summary>        ///  DEC   加密過程          /// </summary>        /// <param name="pToEncrypt">要加密的字串</param>        /// <param name="sKey">密匙</param>        /// <returns></returns>          public static string Encrypt(string pToEncrypt, string sKey)        {            DESCryptoServiceProvider des = new DESCryptoServiceProvider();     //把字串放到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位移量              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位移量，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，必須把解密後的文本變成流對象                  return System.Text.Encoding.Default.GetString(ms.ToArray());        }

留著備用，省得再網上找。。。

C#加密與解密