C# DES加密/解密字串

 

 

using System;using System.Text;using System.Security.Cryptography;using System.IO;//預設密鑰向量private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };/// <summary>/// DES加密字串/// </summary>/// <param name="encryptString">待加密的字串</param>/// <param name="encryptKey">加密金鑰,要求為8位</param>/// <returns>加密成功返回加密後的字串，失敗返回源串</returns>public static string EncryptDES(string encryptString, string encryptKey){    try     {        byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));        byte[] rgbIV = Keys;        byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);         DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();         MemoryStream mStream = new MemoryStream();         CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);         cStream.Write(inputByteArray, 0, inputByteArray.Length);         cStream.FlushFinalBlock();        return Convert.ToBase64String(mStream.ToArray());     }    catch     {        return encryptString;     }}/// <summary>/// DES解密字串/// </summary>/// <param name="decryptString">待解密的字串</param>/// <param name="decryptKey">解密密鑰,要求為8位,和加密金鑰相同</param>/// <returns>解密成功返回解密後的字串，失敗返源串</returns>public static string DecryptDES(string decryptString, string decryptKey){    try     {        byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);        byte[] rgbIV = Keys;        byte[] inputByteArray = Convert.FromBase64String(decryptString);         DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();         MemoryStream mStream = new MemoryStream();         CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);         cStream.Write(inputByteArray, 0, inputByteArray.Length);         cStream.FlushFinalBlock();        return Encoding.UTF8.GetString(mStream.ToArray());     }    catch     {        return decryptString;     }}