C# DES加密、解密帮助类

DES加密、解密帮助类

System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile 这个已经废弃了，

是一个在.NET 4.5中已经废弃不用的API，参见:

​​https://msdn.microsoft.com/zh-cn/library/system.web.security.formsauthentication.hashpasswordforstoringinconfigfile(v=vs.110).aspx​​

private static string DESKey = "nfine_desencrypt_2021";

        #region ========加密========
        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string Encrypt(string Text)
        {
            return Encrypt(Text, DESKey);
        }
        /// <summary> 
        /// 加密数据 
        /// </summary> 
        /// <param name="Text"></param> 
        /// <param name="sKey"></param> 
        /// <returns></returns> 
        public static string Encrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray;
            inputByteArray = Encoding.Default.GetBytes(Text);
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            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);
            }
            return ret.ToString();
        }

        #endregion

        #region ========解密========
        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string Decrypt(string Text)
        {
            if (!string.IsNullOrEmpty(Text))
            {
                return Decrypt(Text, DESKey);
            }
            else
            {
                return "";
            }
        }
        /// <summary> 
        /// 解密数据 
        /// </summary> 
        /// <param name="Text"></param> 
        /// <param name="sKey"></param> 
        /// <returns></returns> 
        public static string Decrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = Text.Length / 2;
            byte[] inputByteArray = new byte[len];
            int x, i;
            for (x = 0; x < len; x++)
            {
                i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
                inputByteArray[x] = (byte)i;
            }
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            return Encoding.Default.GetString(ms.ToArray());
        }

        #endregion

另一种：

#region 加密算法
        public string MD5(String s)
        {
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(s);
            bytes = md5.ComputeHash(bytes);
            md5.Clear();

            string ret = "";
            for (int i = 0; i < bytes.Length; i++)
            {
                ret += Convert.ToString(bytes[i], 16).PadLeft(2, '0');
            }

            return ret.PadLeft(32, '0');
        }

        public string DesEncrypt(string normalText, string encryptKey)
        {
            var bytes = Encoding.Default.GetBytes(normalText);
            var key = Encoding.UTF8.GetBytes(encryptKey.PadLeft(8, '0').Substring(0, 8));
            using (MemoryStream ms = new MemoryStream())
            {
                var encry = new DESCryptoServiceProvider();
                CryptoStream cs = new CryptoStream(ms, encry.CreateEncryptor(key, key), CryptoStreamMode.Write);
                cs.Write(bytes, 0, bytes.Length);
                cs.FlushFinalBlock();
                return Convert.ToBase64String(ms.ToArray());
            }
        }
        public string DesDecrypt(string securityText, string encryptKey)//解密
        {
            try
            {
                var bytes = Convert.FromBase64String(securityText);
                var key = Encoding.UTF8.GetBytes(encryptKey.PadLeft(8, '0').Substring(0, 8));
                using (MemoryStream ms = new MemoryStream())
                {
                    var descrypt = new DESCryptoServiceProvider();
                    CryptoStream cs = new CryptoStream(ms, descrypt.CreateDecryptor(key, key), CryptoStreamMode.Write);
                    cs.Write(bytes, 0, bytes.Length);
                    cs.FlushFinalBlock();
                    return Encoding.UTF8.GetString(ms.ToArray());
                }

            }
            catch (Exception)
            {
                return string.Empty;
            }
        }
        #endregion