C# DES加密解密

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using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Security.Cryptography;using System.Text;namespace ConsoleApp1{    public class EncryptUtil    {        /// <summary>        /// MD5加密碼字串        /// </summary>        /// <param name="sInputString">訊息體</param>        /// <returns>MD5簽名字元</returns>        public static string MD5Encrypt(string sInputString)        {            System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();            string encoded = BitConverter.ToString(md5.ComputeHash(Encoding.UTF8.GetBytes(sInputString))).Replace("-", "");            return encoded;        }        /// <summary>        /// DES加密        /// </summary>        /// <param name="sInputString">加密後的訊息體</param>        /// <param name="sKey">24位的密鑰</param>        /// <returns>解密後的訊息體</returns>        public static string DESEncryptBase64(string sInputString, string sKey)        {            if (string.IsNullOrEmpty(sInputString) || string.IsNullOrEmpty(sKey) || sKey.Length != 24)            {                return string.Empty;            }            DESCryptoServiceProvider des = new DESCryptoServiceProvider();            des.Mode = CipherMode.ECB;            des.Padding = PaddingMode.PKCS7;            string key = sKey.Substring(0, 12);            string iv = sKey.Remove(0, 12);            byte[] byKey = Convert.FromBase64String(key);            byte[] byIV = Convert.FromBase64String(iv);            byte[] inputByteArray = Encoding.UTF8.GetBytes(sInputString);            MemoryStream ms = new MemoryStream();            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);            cs.Write(inputByteArray, 0, inputByteArray.Length);            cs.FlushFinalBlock();            return Convert.ToBase64String(ms.ToArray());        }        /// <summary>        /// DES解密        /// </summary>        /// <param name="sInputString">待加密訊息體</param>        /// <param name="sKey">24位的密鑰</param>        /// <returns>加密後的訊息體</returns>        public static string DESDecryptBase64(string sInputString, string sKey)        {            if (string.IsNullOrEmpty(sInputString) || string.IsNullOrEmpty(sKey) || sKey.Length != 24)            {                return string.Empty;            }            DESCryptoServiceProvider des = new DESCryptoServiceProvider();            des.Mode = CipherMode.ECB;            des.Padding = PaddingMode.PKCS7;            string key = sKey.Substring(0, 12);            string iv = sKey.Remove(0, 12);            byte[] byKey = Convert.FromBase64String(key);            byte[] byIV = Convert.FromBase64String(iv);            byte[] inputByteArray = Convert.FromBase64String(sInputString);            MemoryStream ms = new MemoryStream();            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, byIV), CryptoStreamMode.Write);            cs.Write(inputByteArray, 0, inputByteArray.Length);            cs.FlushFinalBlock();            Encoding encoding = new UTF8Encoding();            return encoding.GetString(ms.ToArray());        }    }}

　　

C# DES加密解密