C#实现模拟登录百度并发送私信

首先获取Token，根据Token获取PubliKey，使用RSA加密POST数据

private Regex _regex = new Regex(@"{.*}", RegexOptions.IgnoreCase);
        static void Main(string[] args)
        {
            new Program().Login("用户名", "密码");
            
            Console.ReadLine();
        }

        public static string Get_time_13()
        {
            DateTime d = DateTime.Now.AddHours(-8.0);
            DateTime d2 = Convert.ToDateTime("1970-01-01 ");
            return (d - d2).TotalMilliseconds.ToString("0");
        }

        public void Login(string username, string pwd)
        {
            var cookieContainer = new CookieContainer();
            var token = GetToken(cookieContainer);
            if (_regex.IsMatch(token))
            {
                token = _regex.Match(token).Value;
            }
            var resultToken = JsonConvert.DeserializeObject<ResultToken>(token);

            var pubKey = GetPubKey(resultToken.Data.Token, cookieContainer);
            if (_regex.IsMatch(pubKey))
            {
                pubKey = _regex.Match(pubKey).Value;
            }
            var publicKey = JsonConvert.DeserializeObject<PublicRsaKey>(pubKey);

            var rsakey = publicKey.Key;

            var pemToXml = RSAHelper.PemToXml(publicKey.Pubkey);
            var password = RSAHelper.RSAEncrypt(pemToXml, pwd);
            var url = "https://passport.baidu.com/v2/api/?login";
            var postdata = string.Format("staticpage=http%3A%2F%2Fapp.baidu.com%2Fsfile%2Fv3Jump.html&charset=UTF-8&token={0}&tpl=wise&subpro=&apiver=v3&tt={1}&codestring=&safeflg=0&u=%0D%0A%0D%0Ahttp%3A%2F%2Fapp.baidu.com%2Findex%3Fregdev%3D1&isPhone=false&quick_user=0&logintype=dialogLogin&logLoginType=pc_loginDialog&idc=&loginmerge=true&splogin=newuser&username={2}&password={3}&verifycode=&mem_pass=on&rsakey={4}&crypttype=12&ppui_logintime=426406&callback=parent.bd__pcbs__mwrr8d", resultToken.Data.Token, GetJsTimeSeconds(), HttpUtility.UrlEncode(username), HttpUtility.UrlEncode(password), HttpUtility.UrlEncode(rsakey));
            PostRequest(url, cookieContainer, postdata);
        }

        private string GetToken(CookieContainer cookieContainer)
        {
            var url = string.Format(@"https://passport.baidu.com/v2/api/?getapi&tpl=wise&apiver=v3&tt={0}&class=login&logintype=dialogLogin&callback=bd__cbs__v5pvt1", GetJsTimeSeconds());
            GetHtml(url, ref cookieContainer);
            return GetHtml(url, ref cookieContainer);
        }

        private string GetPubKey(string token, CookieContainer cookieContainer)
        {
            var url = string.Format("https://passport.baidu.com/v2/getpublickey?token={0}&tpl=wise&apiver=v3&tt={1}&callback=bd__cbs__fwnq4r", token, GetJsTimeSeconds());
            var html = GetHtml(url, ref cookieContainer);
            return html;
        }

        private static string GetJsTimeSeconds()
        {
            return (DateTime.UtcNow - DateTime.Parse("1970-01-01 0:0:0")).TotalMilliseconds.ToString("0");
        }

        private string GetHtml(string url, ref CookieContainer cookie)
        {
            HttpWebRequest request = null;
            HttpWebResponse response = null;
            try
            {
                request = (HttpWebRequest)WebRequest.Create(url);
                request.Proxy = null;
                request.Credentials = CredentialCache.DefaultCredentials;
                request.Method = "GET";
                request.KeepAlive = true;
                request.Accept = "application/json, text/plain, */*";
                request.CookieContainer = cookie;
                request.AllowAutoRedirect = true;
                response = (HttpWebResponse)request.GetResponse();
                var sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                string ss = sr.ReadToEnd();
                sr.Close();
                request.Abort();
                response.Close();
                return ss;
            }
            catch (WebException ex)
            {
                return "";
            }
        }

        public void PostRequest(string url, CookieContainer cookieContainer, string postData)
        {
            HttpWebRequest request = null;
            HttpWebResponse response = null;
            try
            {
                request = (HttpWebRequest)WebRequest.Create(url);//实例化web访问类  
                request.UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36";
                request.Credentials = CredentialCache.DefaultCredentials;
                request.Method = "POST"; //数据提交方式为POST  
                request.ContentType = "application/x-www-form-urlencoded";
                request.AllowAutoRedirect = false; // 不用需自动跳转
                request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
                request.CookieContainer = cookieContainer;
                request.KeepAlive = true;
                //提交请求  
                byte[] postdatabytes = Encoding.UTF8.GetBytes(postData);
                request.ContentLength = postdatabytes.Length;
                Stream stream;
                stream = request.GetRequestStream();
                //设置POST 数据
                stream.Write(postdatabytes, 0, postdatabytes.Length);
                stream.Close();
                //接收响应  
                response = (HttpWebResponse)request.GetResponse();
                var cookieCollection = response.Cookies;//拿到bduss 说明登录成功
                //保存返回cookie  
                //取下一次GET跳转地址  
                StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                string content = sr.ReadToEnd();
                CheckLogin(content);
                CheckSendMSG(cookieContainer);
                sr.Close();
            }
            catch (Exception ex)
            {

            }
            finally
            {
                if (request != null) request.Abort();
                if (response != null) response.Close();
            }
        }

        public static void CheckLogin(string content)
        {
            int after = content.IndexOf("err_no");
            if (after > 0)
            {
                string html = content.Substring(after);
                int index = html.IndexOf("=");
                int and = html.IndexOf("&");
                string ErrorCode = html.Substring(index + 1, and - index - 1);
                switch (ErrorCode)
                {
                    case "0":
                        Console.WriteLine("登录成功");
                        break;
                    case "7":
                        Console.WriteLine("密码错误");
                        break;
                    case "257":
                        Console.WriteLine("用户名不存在");
                        break;
                }
            }
        }

向指定收件人发送百度私信：

public static string FindString(string content, string str)//找到字符串位置
        {
            int num = content.IndexOf(str);
            if (num >= 0)
            {
                int length = str.Length;
                return content.Substring(num + length, content.Length - num - length);
            }
            return "";
        }

        public static string GetString(string content, string str)//截取字符串
        {
            int One = content.IndexOf(str);
            int Two = content.IndexOf(str, One + 1);
            return content.Substring(One + 1, Two - One - 1);
        }
        /// <summary>
        /// 发送百度私信
        /// </summary>
        /// <param name="User">收件人</param>
        /// <param name="MSG">发送的内容</param>
        /// <param name="cookie">Cookie</param>
        /// <param name="Token">Token字符串</param>
        /// <param name="Vcode">验证码</param>
        /// <param name="VcodeStr">动态验证码字符串</param>
        /// <returns></returns>
        public string SendMSG(string User, string MSG, CookieContainer cookie, string Token, string Vcode, string VcodeStr)
        {
            HttpHelper http = new HttpHelper(cookie);
            http.Encoding = Encoding.UTF8;
            string html = http.GetHtml("http://msg.baidu.com/msg/writing/submit/msg", cookie, "msgcontent=" + MSG + "&vcode=" + Vcode + "&msgvcode=" + VcodeStr + "&msgreceiver=" + HttpUtility.UrlEncode(User, Encoding.UTF8) + ";&bdstoken=" + Token + "&qing_request_source=", true);
            //string html = http.GetHtml("http://msg.baidu.com/msg/home");
            return html;
        }

        public void CheckSendMSG(CookieContainer cookie)
        {
            try
            {
                //获取Token
                string TokenHtml = GetHtml("http://msg.baidu.com/msg/writing", ref cookie);
                string Token = GetString(FindString(TokenHtml, "window.msgBdsToken"), """);
                //获取验证码字符串
                string VcodeHtml = GetHtml("https://passport.baidu.com/v2/?reggetcodestr&tpl=qing&app=stelyg&apiver=v3&class=reg&echoback=msg.home.editor.changeVerifyCode&tt=1471663009977&callback=msg.msgpublish.Form.changeVerifyCode", ref cookie);
                string VcodeStr = GetString(FindString(VcodeHtml, ""verifyStr""), """);
                //获取验证码图片
                WebClient client = new WebClient();
                client.DownloadFile("https://passport.baidu.com/cgi-bin/genimage?" + VcodeStr + "&t=1471585459062", "D:\验证码.png");

                Console.Write("请输入收件人：");
                string User = Console.ReadLine();
                Console.Write("请输入发送内容：");
                string MSG = Console.ReadLine();
                Console.Write("请输入验证码：");
                string Vcode = Console.ReadLine();
                string html = SendMSG(User, MSG, cookie, Token, Vcode, VcodeStr);
                string ErrorCode = GetString(FindString(html, "errorNo"), """);
                switch (ErrorCode)
                {
                    case "0":
                        Console.WriteLine("发送成功");
                        break;
                    case "3018":
                        Console.WriteLine("用户名不存在");
                        break;
                    case "3014":
                        Console.WriteLine("验证码错误");
                        break;
                }
                Console.WriteLine(html);
            }
            catch (Exception e)
            {

            }
        }

对RAS秘钥的加密和解密方法，需要引用BouncyCastle.Crypto.dll

public static string PemToXml(string pem)
        {
            if (pem.StartsWith("-----BEGIN RSA PRIVATE KEY-----")
                || pem.StartsWith("-----BEGIN PRIVATE KEY-----"))
            {
                return GetXmlRsaKey(pem, obj =>
                {
                    if ((obj as RsaPrivateCrtKeyParameters) != null)
                        return DotNetUtilities.ToRSA((RsaPrivateCrtKeyParameters)obj);
                    var keyPair = (AsymmetricCipherKeyPair)obj;
                    return DotNetUtilities.ToRSA((RsaPrivateCrtKeyParameters)keyPair.Private);
                }, rsa => rsa.ToXmlString(true));
            }

            if (pem.StartsWith("-----BEGIN PUBLIC KEY-----"))
            {
                return GetXmlRsaKey(pem, obj =>
                {
                    var publicKey = (RsaKeyParameters)obj;
                    return DotNetUtilities.ToRSA(publicKey);
                }, rsa => rsa.ToXmlString(false));
            }

            throw new InvalidKeyException("Unsupported PEM format...");
        }
        private static string GetXmlRsaKey(string pem, Func<object, RSA> getRsa, Func<RSA, string> getKey)
        {
            using (var ms = new MemoryStream())
            using (var sw = new StreamWriter(ms))
            using (var sr = new StreamReader(ms))
            {
                sw.Write(pem);
                sw.Flush();
                ms.Position = 0;
                var pr = new PemReader(sr);
                object keyPair = pr.ReadObject();
                using (RSA rsa = getRsa(keyPair))
                {
                    var xml = getKey(rsa);
                    return xml;
                }
            }
        }
       
        
        /// <summary>
        /// RSA加密
        /// </summary>
        /// <param name="publickey"></param>
        /// <param name="content"></param>
        /// <returns></returns>
        public static string RSAEncrypt(string publickey, string content)
        {
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            byte[] cipherbytes;
            rsa.FromXmlString(publickey);
            cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(content), false);

            return Convert.ToBase64String(cipherbytes);
        }

        /// <summary>
        /// RSA解密
        /// </summary>
        /// <param name="privatekey"></param>
        /// <param name="content"></param>
        /// <returns></returns>
        public static string RSADecrypt(string privatekey, string content)
        {
            privatekey =
                @"<RSAKeyValue><Modulus>5m9m14XH3oqLJ8bNGw9e4rGpXpcktv9MSkHSVFVMjHbfv+SJ5v0ubqQxa5YjLN4vc49z7SVju8s0X4gZ6AzZTn06jzWOgyPRV54Q4I0DCYadWW4Ze3e+BOtwgVU1Og3qHKn8vygoj40J6U85Z/PTJu3hN1m75Zr195ju7g9v4Hk=</Modulus><Exponent>AQAB</Exponent><P>/hf2dnK7rNfl3lbqghWcpFdu778hUpIEBixCDL5WiBtpkZdpSw90aERmHJYaW2RGvGRi6zSftLh00KHsPcNUMw==</P><Q>6Cn/jOLrPapDTEp1Fkq+uz++1Do0eeX7HYqi9rY29CqShzCeI7LEYOoSwYuAJ3xA/DuCdQENPSoJ9KFbO4Wsow==</Q><DP>ga1rHIJro8e/yhxjrKYo/nqc5ICQGhrpMNlPkD9n3CjZVPOISkWF7FzUHEzDANeJfkZhcZa21z24aG3rKo5Qnw==</DP><DQ>MNGsCB8rYlMsRZ2ek2pyQwO7h/sZT8y5ilO9wu08Dwnot/7UMiOEQfDWstY3w5XQQHnvC9WFyCfP4h4QBissyw==</DQ><InverseQ>EG02S7SADhH1EVT9DD0Z62Y0uY7gIYvxX/uq+IzKSCwB8M2G7Qv9xgZQaQlLpCaeKbux3Y59hHM+KpamGL19Kg==</InverseQ><D>vmaYHEbPAgOJvaEXQl+t8DQKFT1fudEysTy31LTyXjGu6XiltXXHUuZaa2IPyHgBz0Nd7znwsW/S44iql0Fen1kzKioEL3svANui63O3o5xdDeExVM6zOf1wUUh/oldovPweChyoAdMtUzgvCbJk1sYDJf++Nr0FeNW1RB1XG30=</D></RSAKeyValue>";
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            byte[] cipherbytes;
            rsa.FromXmlString(privatekey);
            cipherbytes = rsa.Decrypt(Convert.FromBase64String(content), false);

            return Encoding.UTF8.GetString(cipherbytes);
        }

封装字段：

public class PublicRsaKey
    {
        [JsonProperty("errno")]
        public string Errno { get; set; }

        [JsonProperty("msg")]
        public string Msg { get; set; }

        [JsonProperty("pubkey")]
        public string Pubkey { get; set; }

        [JsonProperty("key")]
        public string Key { get; set; }
    }

    public class ErrInfo
    {

        [JsonProperty("no")]
        public string No { get; set; }
    }

    public class Loginrecord
    {

        [JsonProperty("email")]
        public object[] Email { get; set; }

        [JsonProperty("phone")]
        public object[] Phone { get; set; }
    }

    public class Data
    {

        [JsonProperty("rememberedUserName")]
        public string RememberedUserName { get; set; }

        [JsonProperty("codeString")]
        public string CodeString { get; set; }

        [JsonProperty("token")]
        public string Token { get; set; }

        [JsonProperty("cookie")]
        public string Cookie { get; set; }

        [JsonProperty("usernametype")]
        public string Usernametype { get; set; }

        [JsonProperty("spLogin")]
        public string SpLogin { get; set; }

        [JsonProperty("disable")]
        public string Disable { get; set; }

        [JsonProperty("loginrecord")]
        public Loginrecord Loginrecord { get; set; }
    }



    public class ResultToken
    {

        [JsonProperty("errInfo")]
        public ErrInfo ErrInfo { get; set; }

        [JsonProperty("data")]
        public Data Data { get; set; }
    }