钉钉审批流回调

先注册回调接口(只需要调用注册回调接口一次)，

using Newtonsoft.Json;

public void DingdingTest()
        {
            string accessToken = dingApp.getAccessToken();

            string code = "jiangxiaobai";//@NFine.Code.OperatorProvider.Provider.GetCurrent().UserCode;
            var userEntry = userApp.GetList().Where(t => t.F_Account == code).FirstOrDefault();
            List<string> list = new List<string>();
            list.Add("bpms_task_change");//审批任务开始，结束，转交
            list.Add("bpms_instance_change");//审批实例开始，结束
            list.Add("user_leave_org");
            IDingTalkClient client = new DefaultDingTalkClient("https://oapi.dingtalk.com/call_back/register_call_back");
            OapiCallBackRegisterCallBackRequest request = new OapiCallBackRegisterCallBackRequest();

            request.Url      = "http://fab.retsc.com/Receive.ashx";//17        18             request.AesKey   = ding.ENCODING_AES_KEY;//("45skhqweass5232345IUJKWEDL5251054DSFdsuhfW2");//随意
            request.Token    = "123456";//随意
 
            request.CallBackTag = list;
            OapiCallBackRegisterCallBackResponse response = client.Execute(request, accessToken);
        }

注册后查询

public void DingdingLook(){
  　　　　　　　　IDingTalkClient client = new DefaultDingTalkClient("https://oapi.dingtalk.com/call_back/get_call_back");
31             OapiCallBackGetCallBackRequest request = new OapiCallBackGetCallBackRequest();
32             request.SetHttpMethod("GET");
33             OapiCallBackGetCallBackResponse response = client.Execute(request, accessToken);
}

 

新建一个后缀为.ashx的文件

using System;
using System.Collections;
using System.Configuration;
using System.IO;
using System.Text;
using System.Web;
using System.Web.Services;
using Newtonsoft.Json;
using DDApi;
using DDApi.TESTSC.COM;
using NFine.Code;
using NFine.Application.FAManage;
using NFine.Domain.Entity.FAManage;
using System.Linq;

namespace TEST.Web
{
    /// <summary>
    /// Receive 的摘要说明
    /// </summary>
    public class Receive : IHttpHandler
    {
        //ILog logger = LogManager.GetLogger(typeof(Receive));
        private NFine.Code.Log log  = LogFactory.GetLogger("ReceiveError");
       
        private string GetPostParam(HttpContext context)
        {
            if ("POST" == context.Request.RequestType)
            {
                Stream sm = context.Request.InputStream;//获取post正文
                int len = (int)sm.Length;//post数据长度
                byte[] inputByts = new byte[len];//字节数据,用于存储post数据
                sm.Read(inputByts, 0, len);//将post数据写入byte数组中
                sm.Close();//关闭IO流

                //**********下面是把字节数组类型转换成字符串**********

                string data = Encoding.UTF8.GetString(inputByts);//转为String
                data = data.Replace("{\"encrypt\":\"", "").Replace("\"}", "");
                return data;
            }
            return "get方法";
        }



        public void ProcessRequest(HttpContext context)
        {
           // context.Response.ContentType = "text/plain";
           //  context.Response.Write("Hello World");

            try
            {
                #region 获取套件配置参数
                string mToken          = DDApi.TEST.COM.ding.Token  ;// ConfigurationManager.AppSettings["Token"];
                string mSuiteKey       = DDApi.TEST.COM.ding.Corpid;
                string mEncodingAesKey = DDApi.TEST.COM.ding.ENCODING_AES_KEY;// ConfigurationManager.AppSettings["EncodingAESKey"];
                //mSuiteKey = "suite4xxxxxxxxxxxxxxx";
                #endregion

                #region 获取回调URL里面的参数
                //url中的签名
                string msgSignature  = context.Request["signature"];
                //url中的时间戳
                string timeStamp     = context.Request["timestamp"];
                //url中的随机字符串
                string nonce         = context.Request["nonce"];
                //post数据包数据中的加密数据
                string encryptStr    = GetPostParam(context);
                #endregion

                string sEchoStr = "";

                #region 验证回调的url
                
                DDApi.TEST.COM.DingTalkCrypt dingTalk = new DingTalkCrypt(mToken, mEncodingAesKey, mSuiteKey);

                var ret = dingTalk.VerifyURL(msgSignature, timeStamp, nonce, encryptStr, ref sEchoStr);

                // var ret = dingTalk.VerifyURL(mToken, mEncodingAesKey, msgSignature, timeStamp, nonce, encryptStr, ref mSuiteKey);

                if (ret != 0)
                {  
                    log.Error("ERR: VerifyURL fail, ret: " + ret);
                    return;
                }
                #endregion

                #region
                //构造DingTalkCrypt
               // DingTalkCrypt dingTalk = new DingTalkCrypt(mToken, mEncodingAesKey, mSuiteKey);

                string plainText = "";
                dingTalk.DecryptMsg(msgSignature, timeStamp, nonce, encryptStr, ref plainText);
                Hashtable tb = (Hashtable)JsonConvert.DeserializeObject(plainText, typeof(Hashtable));
                string eventType = tb["EventType"].ToString();
                string res = "success";
                log.Error("plainText:" + plainText);
                log.Info("eventType:" + eventType);
                switch (eventType)
                {
                    case "suite_ticket"://定时推送Ticket
                        ConfigurationManager.AppSettings["SuiteTicket"] = tb["SuiteTicket"].ToString();
                        mSuiteKey = tb["SuiteKey"].ToString();
                      //  dingTalk.SaveSuiteTicket(tb);
                        break;
                    case "tmp_auth_code"://钉钉推送过来的临时授权码
                        ConfigurationManager.AppSettings["TmpAuthCode"] = tb["AuthCode"].ToString();
                      //  dingTalk.SaveTmpAuthCode(tb);
                        break;
                    case "change_auth":// do something;
                        break;
                    case "check_update_suite_url":
                        res = tb["Random"].ToString();
                        mSuiteKey = tb["TestSuiteKey"].ToString();
                        break;
                    case "bpms_task_change"://审批任务开始，结束，转交

                        break;
                    case "bpms_instance_change"://审批实例开始，结束
                        string processCode = tb["processCode"].ToString();
                        if (processCode== "PROC-13AFD99D-97F7-4893-8C5D-E612B960BBBC")
                        {
                            string processInstanceId = tb["processInstanceId"].ToString();//审批实例ID
                            var a = ding.getProcessInstance(processInstanceId);
                            var b = a.ProcessInstance;
                            if (b.Status== "COMPLETED")
                            {
                                foreach (var item in b.FormComponentValues)
                                {
                                    if (item.Name=="调拨单号")
                                    {
                                        string sheetno = item.Value;
                                        TransMasterApp tApp = new TransMasterApp();
                                        var  bill = tApp.GetList().Where(t => t.F_SHEETNO == sheetno).FirstOrDefault();
                                        bill.F_STATUS = 10;
                                        tApp.UpdateForm(bill);
                                    }
                                }
                            }
                            else if(b.Status == "TERMINATED")
                            {
                                foreach (var item in b.FormComponentValues)
                                {
                                    if (item.Name == "调拨单号")
                                    {
                                        string sheetno = item.Value;
                                        TransMasterApp tApp = new TransMasterApp();
                                        var bill = tApp.GetList().Where(t => t.F_SHEETNO == sheetno).FirstOrDefault();
                                        bill.F_STATUS = 11;
                                        tApp.UpdateForm(bill);
                                    }
                                }
                            }
                        }
                        break;
                }

                timeStamp = NFine.Code.DateTimeUtil.DateTimeToTimeStamp(DateTime.Now).ToString();
                string encrypt = "";
                string signature = "";
                dingTalk = new DingTalkCrypt(mToken, mEncodingAesKey, mSuiteKey);
                dingTalk.EncryptMsg(res, timeStamp, nonce, ref encrypt, ref signature);
                Hashtable jsonMap = new Hashtable
                {
                    {"msg_signature", signature},
                    {"encrypt", encrypt},
                    {"timeStamp", timeStamp},
                    {"nonce", nonce}
                };
                string result = JsonConvert.SerializeObject(jsonMap);
                context.Response.Write(result);
                #endregion
            }
            catch (Exception ex)
            {
                log.Error(ex.Message);
                
            }


        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }


    }
}

 

 获取时间戳的方法

 /// <summary>
        /// DateTime转换为10位时间戳（单位：秒）
        /// </summary>
        /// <param name="dateTime"> DateTime</param>
        /// <returns>10位时间戳（单位：秒）</returns>
public static long DateTimeToTimeStamp(DateTime dateTime)
        {
            return (long)(dateTime.ToUniversalTime() - timeStampStartTime).TotalSeconds;
        }

必要的两个类，

using System;
using System.Collections;
using System.Security.Cryptography;
using System.Text;
namespace DDApi.TESTSC.COM { 
    /// <summary>
    /// 加密类
    /// </summary>
public class DingTalkCrypt
    {
        private string m_sEncodingAESKey;
        private string m_sToken;
        private string m_sSuiteKey;
        /**ask getPaddingBytes key固定长度**/
        private static int AES_ENCODE_KEY_LENGTH = 43;
        /**加密随机字符串字节长度**/
        //private static int RANDOM_LENGTH = 16;

        enum DingTalkCryptErrorCode
        {
            /**成功**/
            SUCCESS = 0,
            /**加密明文文本非法**/
            ENCRYPTION_PLAINTEXT_ILLEGAL = 900001,
            /**加密时间戳参数非法**/
            ENCRYPTION_TIMESTAMP_ILLEGAL = 900002,
            /**加密随机字符串参数非法**/
            ENCRYPTION_NONCE_ILLEGAL = 900003,
            /**不合法的aeskey**/
            AES_KEY_ILLEGAL = 900004,
            /**签名不匹配**/
            SIGNATURE_NOT_MATCH = 900005,
            /**计算签名错误**/
            COMPUTE_SIGNATURE_ERROR = 900006,
            /**计算加密文字错误**/
            COMPUTE_ENCRYPT_TEXT_ERROR = 900007,
            /**计算解密文字错误**/
            COMPUTE_DECRYPT_TEXT_ERROR = 900008,
            /**计算解密文字长度不匹配**/
            COMPUTE_DECRYPT_TEXT_LENGTH_ERROR = 900009,
            /**计算解密文字suiteKey不匹配**/
            COMPUTE_DECRYPT_TEXT_SuiteKey_ERROR = 900010,
        };
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="token">钉钉开放平台上，开发者设置的token</param>
        /// <param name="encodingAesKey">钉钉开放台上，开发者设置的EncodingAESKey</param>
        /// <param name="suiteKey">钉钉开放平台上，开发者设置的suiteKey</param>
        public DingTalkCrypt(string token, string encodingAesKey, string suiteKey)
        {
            m_sToken = token;
            m_sSuiteKey = suiteKey;
            m_sEncodingAESKey = encodingAesKey;
        }

        /// <summary>
        /// 将消息加密,返回加密后字符串
        /// </summary>
        /// <param name="sReplyMsg">传递的消息体明文</param>
        /// <param name="sTimeStamp">时间戳</param>
        /// <param name="sNonce">随机字符串</param>
        /// <param name="sEncryptMsg">加密后的消息信息</param>
        /// <returns>成功0，失败返回对应的错误码</returns>
        public int EncryptMsg(string sReplyMsg, string sTimeStamp, string sNonce, ref string sEncryptMsg, ref string signature)
        {
            if (string.IsNullOrEmpty(sReplyMsg))
                return (int)DingTalkCryptErrorCode.ENCRYPTION_PLAINTEXT_ILLEGAL;
            if (string.IsNullOrEmpty(sTimeStamp))
                return (int)DingTalkCryptErrorCode.ENCRYPTION_TIMESTAMP_ILLEGAL;
            if (string.IsNullOrEmpty(sNonce))
                return (int)DingTalkCryptErrorCode.ENCRYPTION_NONCE_ILLEGAL;

            if (m_sEncodingAESKey.Length != AES_ENCODE_KEY_LENGTH)
                return (int)DingTalkCryptErrorCode.AES_KEY_ILLEGAL;

            string raw = "";
            try
            {
                raw = CropCrytography.AES_encrypt(sReplyMsg, m_sEncodingAESKey, m_sSuiteKey);
            }
            catch (Exception)
            {
                return (int)DingTalkCryptErrorCode.AES_KEY_ILLEGAL;
            }

            string msgSigature = "";
            int ret = GenerateSignature(m_sToken, sTimeStamp, sNonce, raw, ref msgSigature);
            sEncryptMsg = raw;
            signature = msgSigature;
            return ret;
        }
        /// <summary>
        /// 密文解密
        /// </summary>
        /// <param name="sMsgSignature">签名串</param>
        /// <param name="sTimeStamp">时间戳</param>
        /// <param name="sNonce">随机串</param>
        /// <param name="sPostData">密文</param>
        /// <param name="sMsg">解密后的原文，当return返回0时有效</param>
        /// <returns>成功0，失败返回对应的错误码</returns>
        public int DecryptMsg(string sMsgSignature, string sTimeStamp, string sNonce, string sPostData, ref string sMsg)
        {
            if (m_sEncodingAESKey.Length != AES_ENCODE_KEY_LENGTH)
                return (int)DingTalkCryptErrorCode.AES_KEY_ILLEGAL;

            string sEncryptMsg = sPostData;

            int ret = VerifySignature(m_sToken, sTimeStamp, sNonce, sEncryptMsg, sMsgSignature);

            string cpid = "";
            try
            {
                sMsg = CropCrytography.AES_decrypt(sEncryptMsg, m_sEncodingAESKey, ref cpid);
            }
            catch (FormatException)
            {
                sMsg = "";
                return (int)DingTalkCryptErrorCode.COMPUTE_DECRYPT_TEXT_SuiteKey_ERROR;

            }
            catch (Exception)
            {
                sMsg = "";
                return (int)DingTalkCryptErrorCode.COMPUTE_DECRYPT_TEXT_SuiteKey_ERROR;
            }

            if (cpid != m_sSuiteKey)
                return (int)DingTalkCryptErrorCode.COMPUTE_DECRYPT_TEXT_SuiteKey_ERROR;

            return ret;
        }

        /// <summary>
        /// 生成签名
        /// </summary>
        /// <param name="sToken"></param>
        /// <param name="sTimeStamp"></param>
        /// <param name="sNonce"></param>
        /// <param name="sMsgEncrypt"></param>
        /// <param name="sMsgSignature"></param>
        /// <returns></returns>
        public int GenerateSignature(string sToken, string sTimeStamp, string sNonce, string sMsgEncrypt, ref string sMsgSignature)
        {
            ArrayList AL = new ArrayList();
            AL.Add(sToken);
            AL.Add(sTimeStamp);
            AL.Add(sNonce);
            AL.Add(sMsgEncrypt);
            AL.Sort(new DictionarySort());
            string raw = "";
            for (int i = 0; i < AL.Count; ++i)
            {
                raw += AL[i];
            }

            SHA1 sha;
            ASCIIEncoding enc;
            string hash = "";
            try
            {
                sha = new SHA1CryptoServiceProvider();
                enc = new ASCIIEncoding();
                byte[] dataToHash = enc.GetBytes(raw);
                byte[] dataHashed = sha.ComputeHash(dataToHash);
                hash = BitConverter.ToString(dataHashed).Replace("-", "");
                hash = hash.ToLower();
            }
            catch (Exception)
            {
                return (int)DingTalkCryptErrorCode.COMPUTE_SIGNATURE_ERROR;
            }
            sMsgSignature = hash;
            return 0;
        }
        /// <summary>
        /// 验证签名
        /// </summary>
        /// <param name="sToken"></param>
        /// <param name="sTimeStamp"></param>
        /// <param name="sNonce"></param>
        /// <param name="sMsgEncrypt"></param>
        /// <param name="sSigture"></param>
        /// <returns></returns>
        public int VerifySignature(string sToken, string sTimeStamp, string sNonce, string sMsgEncrypt, string sSigture)
        {
            string hash = "";
            int ret = 0;
            ret = GenerateSignature(sToken, sTimeStamp, sNonce, sMsgEncrypt, ref hash);
            if (ret != 0)
                return ret;
            if (hash == sSigture)
                return 0;
            else
            {
                return (int)DingTalkCryptErrorCode.SIGNATURE_NOT_MATCH;
            }
        }

        /// <summary>
        /// 验证URL
        /// </summary>
        /// <param name="sMsgSignature">签名串，对应URL参数的msg_signature</param>
        /// <param name="sTimeStamp">时间戳，对应URL参数的timestamp</param>
        /// <param name="sNonce">随机串，对应URL参数的nonce</param>
        /// <param name="sEchoStr">经过加密的消息体，对应URL参数的encrypt</param>
        /// <param name="sReplyEchoStr"></param>
        /// <returns></returns>
        public int VerifyURL(string sMsgSignature, string sTimeStamp, string sNonce, string sEchoStr, ref string sReplyEchoStr)
        {
            int ret = 0;
            if (m_sEncodingAESKey.Length != 43)
            {
                return (int)DingTalkCryptErrorCode.AES_KEY_ILLEGAL;
            }
            ret = VerifySignature(m_sToken, sTimeStamp, sNonce, sEchoStr, sMsgSignature);
            sReplyEchoStr = "";
            string cpid = "";
            try
            {
                sReplyEchoStr = CropCrytography.AES_decrypt(sEchoStr, m_sEncodingAESKey, ref cpid); //m_sCorpID);
            }
            catch (Exception)
            {
                sReplyEchoStr = "";
                return (int)DingTalkCryptErrorCode.COMPUTE_SIGNATURE_ERROR;
            }
            if (cpid != m_sSuiteKey)
            {
                sReplyEchoStr = "";
                return (int)DingTalkCryptErrorCode.COMPUTE_DECRYPT_TEXT_SuiteKey_ERROR;
            }
            return ret;
        }
        /// <summary>
        /// 字典排序
        /// </summary>
        public class DictionarySort : System.Collections.IComparer
        {
            public int Compare(object oLeft, object oRight)
            {
                string sLeft = oLeft as string;
                string sRight = oRight as string;
                int iLeftLength = sLeft.Length;
                int iRightLength = sRight.Length;
                int index = 0;
                while (index < iLeftLength && index < iRightLength)
                {
                    if (sLeft[index] < sRight[index])
                        return -1;
                    else if (sLeft[index] > sRight[index])
                        return 1;
                    else
                        index++;
                }
                return iLeftLength - iRightLength;

            }
        }

    }
}

using System;
using System.IO;
using System.Net;
using System.Security.Cryptography;
using System.Text;

namespace DDApi.TESCSC.COM
{
    /// <summary>
    /// 加密
    /// </summary>
    public class CropCrytography
    {
        public static UInt32 HostToNetworkOrder(UInt32 inval)
        {
            UInt32 outval = 0;
            for (int i = 0; i < 4; i++)
                outval = (outval << 8) + ((inval >> (i * 8)) & 255);
            return outval;
        }

        public static Int32 HostToNetworkOrder(Int32 inval)
        {
            Int32 outval = 0;
            for (int i = 0; i < 4; i++)
                outval = (outval << 8) + ((inval >> (i * 8)) & 255);
            return outval;
        }
        /// <summary>
        /// 解密方法
        /// </summary>
        /// <param name="Input">密文</param>
        /// <param name="EncodingAESKey"></param>
        /// <returns></returns>
        /// 
        public static string AES_decrypt(string Input, string EncodingAESKey, ref string corpid)
        {
            byte[] Key;
            Key = Convert.FromBase64String(EncodingAESKey + "=");
            byte[] Iv = new byte[16];
            Array.Copy(Key, Iv, 16);
            byte[] btmpMsg = AES_decrypt(Input, Iv, Key);

            int len = BitConverter.ToInt32(btmpMsg, 16);
            len = IPAddress.NetworkToHostOrder(len);


            byte[] bMsg = new byte[len];
            byte[] bCorpid = new byte[btmpMsg.Length - 20 - len];
            Array.Copy(btmpMsg, 20, bMsg, 0, len);
            Array.Copy(btmpMsg, 20 + len, bCorpid, 0, btmpMsg.Length - 20 - len);
            string oriMsg = Encoding.UTF8.GetString(bMsg);
            corpid = Encoding.UTF8.GetString(bCorpid);


            return oriMsg;
        }
        /// <summary>
        /// 加密方法
        /// </summary>
        /// <param name="Input"></param>
        /// <param name="EncodingAESKey"></param>
        /// <param name="corpid"></param>
        /// <returns></returns>
        public static string AES_encrypt(string Input, string EncodingAESKey, string corpid)
        {
            byte[] Key;
            Key = Convert.FromBase64String(EncodingAESKey + "=");
            byte[] Iv = new byte[16];
            Array.Copy(Key, Iv, 16);
            string Randcode = CreateRandCode(16);
            byte[] bRand = Encoding.UTF8.GetBytes(Randcode);
            byte[] bCorpid = Encoding.UTF8.GetBytes(corpid);
            byte[] btmpMsg = Encoding.UTF8.GetBytes(Input);
            byte[] bMsgLen = BitConverter.GetBytes(HostToNetworkOrder(btmpMsg.Length));
            byte[] bMsg = new byte[bRand.Length + bMsgLen.Length + bCorpid.Length + btmpMsg.Length];

            Array.Copy(bRand, bMsg, bRand.Length);
            Array.Copy(bMsgLen, 0, bMsg, bRand.Length, bMsgLen.Length);
            Array.Copy(btmpMsg, 0, bMsg, bRand.Length + bMsgLen.Length, btmpMsg.Length);
            Array.Copy(bCorpid, 0, bMsg, bRand.Length + bMsgLen.Length + btmpMsg.Length, bCorpid.Length);

            return AES_encrypt(bMsg, Iv, Key);

        }
        public static string CreateRandCode(int codeLen)
        {
            string codeSerial = "2,3,4,5,6,7,a,c,d,e,f,h,i,j,k,m,n,p,r,s,t,A,C,D,E,F,G,H,J,K,M,N,P,Q,R,S,U,V,W,X,Y,Z";
            if (codeLen == 0)
            {
                codeLen = 16;
            }
            string[] arr = codeSerial.Split(',');
            string code = "";
            int randValue = -1;
            Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
            for (int i = 0; i < codeLen; i++)
            {
                randValue = rand.Next(0, arr.Length - 1);
                code += arr[randValue];
            }
            return code;
        }

        private static string AES_encrypt(string Input, byte[] Iv, byte[] Key)
        {
            var aes = new RijndaelManaged();
            //秘钥的大小，以位为单位
            aes.KeySize = 256;
            //支持的块大小
            aes.BlockSize = 128;
            //填充模式
            aes.Padding = PaddingMode.PKCS7;
            aes.Mode = CipherMode.CBC;
            aes.Key = Key;
            aes.IV = Iv;
            var encrypt = aes.CreateEncryptor(aes.Key, aes.IV);
            byte[] xBuff = null;

            using (var ms = new MemoryStream())
            {
                using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write))
                {
                    byte[] xXml = Encoding.UTF8.GetBytes(Input);
                    cs.Write(xXml, 0, xXml.Length);
                }
                xBuff = ms.ToArray();
            }
            string Output = Convert.ToBase64String(xBuff);
            return Output;
        }

        private static string AES_encrypt(byte[] Input, byte[] Iv, byte[] Key)
        {
            var aes = new RijndaelManaged();
            //秘钥的大小，以位为单位
            aes.KeySize = 256;
            //支持的块大小
            aes.BlockSize = 128;
            //填充模式
            //aes.Padding = PaddingMode.PKCS7;
            aes.Padding = PaddingMode.None;
            aes.Mode = CipherMode.CBC;
            aes.Key = Key;
            aes.IV = Iv;
            var encrypt = aes.CreateEncryptor(aes.Key, aes.IV);
            byte[] xBuff = null;

            #region 自己进行PKCS7补位，用系统自己带的不行
            byte[] msg = new byte[Input.Length + 32 - Input.Length % 32];
            Array.Copy(Input, msg, Input.Length);
            byte[] pad = KCS7Encoder(Input.Length);
            Array.Copy(pad, 0, msg, Input.Length, pad.Length);
            #endregion

            #region 注释的也是一种方法，效果一样
            //ICryptoTransform transform = aes.CreateEncryptor();
            //byte[] xBuff = transform.TransformFinalBlock(msg, 0, msg.Length);
            #endregion

            using (var ms = new MemoryStream())
            {
                using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write))
                {
                    cs.Write(msg, 0, msg.Length);
                }
                xBuff = ms.ToArray();
            }

            string Output = Convert.ToBase64String(xBuff);
            return Output;
        }

        public static byte[] KCS7Encoder(int text_length)
        {
            int block_size = 32;
            // 计算需要填充的位数
            int amount_to_pad = block_size - (text_length % block_size);
            if (amount_to_pad == 0)
            {
                amount_to_pad = block_size;
            }
            // 获得补位所用的字符
            char pad_chr = chr(amount_to_pad);
            string tmp = "";
            for (int index = 0; index < amount_to_pad; index++)
            {
                tmp += pad_chr;
            }
            return Encoding.UTF8.GetBytes(tmp);
        }
        /**
         * 将数字转化成ASCII码对应的字符，用于对明文进行补码
         * 
         * @param a 需要转化的数字
         * @return 转化得到的字符
         */
        static char chr(int a)
        {

            byte target = (byte)(a & 0xFF);
            return (char)target;
        }
        private static byte[] AES_decrypt(string Input, byte[] Iv, byte[] Key)
        {
            RijndaelManaged aes = new RijndaelManaged();
            aes.KeySize = 256;
            aes.BlockSize = 128;
            aes.Mode = CipherMode.CBC;
            aes.Padding = PaddingMode.None;
            aes.Key = Key;
            aes.IV = Iv;
            var decrypt = aes.CreateDecryptor(aes.Key, aes.IV);
            byte[] xBuff = null;
            using (var ms = new MemoryStream())
            {
                using (var cs = new CryptoStream(ms, decrypt, CryptoStreamMode.Write))
                {
                    byte[] xXml = Convert.FromBase64String(Input);
                    byte[] msg = new byte[xXml.Length + 32 - xXml.Length % 32];
                    Array.Copy(xXml, msg, xXml.Length);
                    cs.Write(xXml, 0, xXml.Length);
                }
                xBuff = decode2(ms.ToArray());
            }
            return xBuff;
        }
        private static byte[] decode2(byte[] decrypted)
        {
            int pad = (int)decrypted[decrypted.Length - 1];
            if (pad < 1 || pad > 32)
            {
                pad = 0;
            }
            byte[] res = new byte[decrypted.Length - pad];
            Array.Copy(decrypted, 0, res, 0, decrypted.Length - pad);
            return res;
        }
    }
}