工作中拓展的加密解密传输方式. DES对称加密传输.

系统间通过xml传输, 不能采用明文, 就加密传输. 秘钥(真正有效的是前8位)存储于配置中.

public static string EncryptStr(this string content, string desKey)
{
	string result;
	try
	{
		if (string.IsNullOrEmpty(desKey))
		{
			result = content;
		}
		else
		{
			DESCryptoServiceProvider dESCryptoServiceProvider = new DESCryptoServiceProvider();
			dESCryptoServiceProvider.Mode = CipherMode.ECB;
			byte[] array = new byte[8];
			if (desKey.Length < 8)
			{
				byte[] bytes = Encoding.UTF8.GetBytes(desKey);
				for (int i = 0; i < array.Length; i++)
				{
					if (bytes.Length > i)
					{
						array[i] = bytes[i];
					}
					else
					{
						array[i] = 0;
					}
				}
			}
			else
			{
				array = Encoding.UTF8.GetBytes(desKey.Substring(0, 8));
			}
			dESCryptoServiceProvider.Key = array;
			dESCryptoServiceProvider.IV = dESCryptoServiceProvider.Key;
			byte[] bytes2 = Encoding.UTF8.GetBytes(content);
			MemoryStream memoryStream = new MemoryStream();
			CryptoStream cryptoStream = new CryptoStream(memoryStream, dESCryptoServiceProvider.CreateEncryptor(), CryptoStreamMode.Write);
			cryptoStream.Write(bytes2, 0, bytes2.Length);
			cryptoStream.FlushFinalBlock();
			StringBuilder stringBuilder = new StringBuilder();
			byte[] array2 = memoryStream.ToArray();
			for (int j = 0; j < array2.Length; j++)
			{
				byte b = array2[j];
				stringBuilder.Append(b.ToString());
				stringBuilder.Append("_");
			}
			if (stringBuilder.Length > 0)
			{
				stringBuilder = stringBuilder.Remove(stringBuilder.Length - 1, 1);
			}
			result = stringBuilder.ToString();
		}
	}
	catch (Exception)
	{
		result = content;
	}
	return result;
}

--- 如下解密方法:
public static string DecryptStr(this string content, string desKey)
{
	string result;
	try
	{
		if (string.IsNullOrEmpty(desKey))
		{
			result = content;
		}
		else
		{
			DESCryptoServiceProvider dESCryptoServiceProvider = new DESCryptoServiceProvider();
			dESCryptoServiceProvider.Mode = CipherMode.ECB;
			byte[] array = new byte[8];
			if (desKey.Length < 8)
			{
				byte[] bytes = Encoding.UTF8.GetBytes(desKey);
				for (int i = 0; i < array.Length; i++)
				{
					if (bytes.Length > i)
					{
						array[i] = bytes[i];
					}
					else
					{
						array[i] = 0;
					}
				}
			}
			else
			{
				array = Encoding.UTF8.GetBytes(desKey.Substring(0, 8));
			}
			dESCryptoServiceProvider.Key = array;
			dESCryptoServiceProvider.IV = dESCryptoServiceProvider.Key;
			string[] array2 = content.Split(new char[]
			{
				'_'
			});
			byte[] array3 = new byte[array2.Length];
			for (int j = 0; j < array2.Length; j++)
			{
				array3[j] = Convert.ToByte(array2[j]);
			}
			MemoryStream memoryStream = new MemoryStream();
			CryptoStream cryptoStream = new CryptoStream(memoryStream, dESCryptoServiceProvider.CreateDecryptor(), CryptoStreamMode.Write);
			cryptoStream.Write(array3, 0, array3.Length);
			cryptoStream.FlushFinalBlock();
			Encoding encoding = new UTF8Encoding();
			result = encoding.GetString(memoryStream.ToArray());
		}
	}
	catch (Exception)
	{
		result = "";
	}
	return result;
}

相应的调用发送WebRequest 方法:

//<add key="DataPushEncryptKey" value="XXXXXXXXXX"/>
//POST 方式, 为了兼容可能的Get传输. 接收XML参数.
if (!string.IsNullOrEmpty(XML))
                    XML = Request.Params["XML"];
                //如果设置了加密key则加密数据
                if (!string.IsNullOrEmpty(XXX.DataPushEncryptKey))
                    XML = XML.DecryptStr(XXX.DataPushEncryptKey);

//<add key="pushDataToXXX" value="XXX/XXX/XXX/XXXXX"/>
// <add key="EncryptKey" value="xxxxxxxxxxx"/>

--如下同步发送方法:
public static string CreatePostXXXHttpResponse(string data)
        {
            string backstr = string.Empty; ;
            try
            {
                //获取发送地址
                string url = ConfigurationManager.AppSettings["pushDataToXXX"];
                string allStr = System.Web.HttpUtility.UrlEncode(data, System.Text.Encoding.UTF8);

                //如果设置了加密key则加密数据
                if (!string.IsNullOrEmpty(XXXEncryptKey))
                    allStr = allStr.EncryptStr(XXXEncryptKey);
                //把参数转成byte
                byte[] bufferB = Encoding.UTF8.GetBytes(allStr);
                //构建HttpWebRequest，并发送
                System.Net.ServicePointManager.DefaultConnectionLimit = 200;
                HttpWebRequest WebReq = (HttpWebRequest)WebRequest.Create(url);
                WebReq.Method = "POST";
                WebReq.ContentType = "application/x-www-form-urlencoded";
                WebReq.ContentLength = allStr.Length;
                Stream PostData = WebReq.GetRequestStream();
                PostData.Write(bufferB, 0, bufferB.Length);
                PostData.Close();
                //接收返回结果
                HttpWebResponse WebResp = (HttpWebResponse)WebReq.GetResponse();
                StreamReader sr = new StreamReader(WebResp.GetResponseStream(), System.Text.Encoding.UTF8);
                backstr = sr.ReadToEnd();
                backstr = HttpUtility.UrlDecode(backstr);
            }
            catch (Exception e)
            {
                return backstr + "</br>" + e.Message;
            }
            return backstr;
        }