.NET Core 企业微信回调配置
作者：互联网
1.配置API接收
2.下载加密解密库
地址：https://developer.work.weixin.qq.com/devtool/introduce?id=36388，也可以复制下面的代码
2.1 WXBizMsgCrypt.cs
该方法封装了VerifyURL, DecryptMsg, EncryptMsg三个接口，分别用于开发者验证回调url，收到用户回复消息的解密以及开发者回复消息的加密过程。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Collections;
//using System.Web;
using System.Security.Cryptography;
//-40001 ： 签名验证错误
//-40002 : xml解析失败
//-40003 : sha加密生成签名失败
//-40004 : AESKey 非法
//-40005 : corpid 校验错误
//-40006 : AES 加密失败
//-40007 ： AES 解密失败
//-40008 ： 解密后得到的buffer非法
//-40009 : base64加密异常
//-40010 : base64解密异常
namespace Entity
{
public class WXBizMsgCrypt
{
string m_sToken;
string m_sEncodingAESKey;
string m_sReceiveId;
enum WXBizMsgCryptErrorCode
{
WXBizMsgCrypt_OK = 0,
WXBizMsgCrypt_ValidateSignature_Error = -40001,
WXBizMsgCrypt_ParseXml_Error = -40002,
WXBizMsgCrypt_ComputeSignature_Error = -40003,
WXBizMsgCrypt_IllegalAesKey = -40004,
WXBizMsgCrypt_ValidateCorpid_Error = -40005,
WXBizMsgCrypt_EncryptAES_Error = -40006,
WXBizMsgCrypt_DecryptAES_Error = -40007,
WXBizMsgCrypt_IllegalBuffer = -40008,
WXBizMsgCrypt_EncodeBase64_Error = -40009,
WXBizMsgCrypt_DecodeBase64_Error = -40010
};
//构造函数
// @param sToken: 企业微信后台，开发者设置的Token
// @param sEncodingAESKey: 企业微信后台，开发者设置的EncodingAESKey
// @param sReceiveId: 不同场景含义不同，详见文档说明
public WXBizMsgCrypt(string sToken, string sEncodingAESKey, string sReceiveId)
{
m_sToken = sToken;
m_sReceiveId = sReceiveId;
m_sEncodingAESKey = sEncodingAESKey;
}
//验证URL
// @param sMsgSignature: 签名串，对应URL参数的msg_signature
// @param sTimeStamp: 时间戳，对应URL参数的timestamp
// @param sNonce: 随机串，对应URL参数的nonce
// @param sEchoStr: 随机串，对应URL参数的echostr
// @param sReplyEchoStr: 解密之后的echostr，当return返回0时有效
// @return：成功0，失败返回对应的错误码
public int VerifyURL(string sMsgSignature, string sTimeStamp, string sNonce, string sEchoStr, ref string sReplyEchoStr)
{
int ret = 0;
if (m_sEncodingAESKey.Length!=43)
{
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
}
ret = VerifySignature(m_sToken, sTimeStamp, sNonce, sEchoStr, sMsgSignature);
if (0 != ret)
{
return ret;
}
sReplyEchoStr = "";
string cpid = "";
try
{
sReplyEchoStr = Cryptography.AES_decrypt(sEchoStr, m_sEncodingAESKey, ref cpid); //m_sReceiveId);
}
catch (Exception)
{
sReplyEchoStr = "";
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error;
}
if (cpid != m_sReceiveId)
{
sReplyEchoStr = "";
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateCorpid_Error;
}
return 0;
}
// 检验消息的真实性，并且获取解密后的明文
// @param sMsgSignature: 签名串，对应URL参数的msg_signature
// @param sTimeStamp: 时间戳，对应URL参数的timestamp
// @param sNonce: 随机串，对应URL参数的nonce
// @param sPostData: 密文，对应POST请求的数据
// @param sMsg: 解密后的原文，当return返回0时有效
// @return: 成功0，失败返回对应的错误码
public int DecryptMsg(string sMsgSignature, string sTimeStamp, string sNonce, string sPostData, ref string sMsg)
{
if (m_sEncodingAESKey.Length!=43)
{
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
}
XmlDocument doc = new XmlDocument();
XmlNode root;
string sEncryptMsg;
try
{
doc.LoadXml(sPostData);
root = doc.FirstChild;
sEncryptMsg = root["Encrypt"].InnerText;
}
catch (Exception)
{
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ParseXml_Error;
}
//verify signature
int ret = 0;
ret = VerifySignature(m_sToken, sTimeStamp, sNonce, sEncryptMsg, sMsgSignature);
if (ret != 0)
return ret;
//decrypt
string cpid = "";
try
{
sMsg = Cryptography.AES_decrypt(sEncryptMsg, m_sEncodingAESKey, ref cpid);
}
catch (FormatException)
{
sMsg = "";
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecodeBase64_Error;
}
catch (Exception)
{
sMsg = "";
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error;
}
if (cpid != m_sReceiveId)
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateCorpid_Error;
return 0;
}
//将企业号回复用户的消息加密打包
// @param sReplyMsg: 企业号待回复用户的消息，xml格式的字符串
// @param sTimeStamp: 时间戳，可以自己生成，也可以用URL参数的timestamp
// @param sNonce: 随机串，可以自己生成，也可以用URL参数的nonce
// @param sEncryptMsg: 加密后的可以直接回复用户的密文，包括msg_signature, timestamp, nonce, encrypt的xml格式的字符串,
// 当return返回0时有效
// return：成功0，失败返回对应的错误码
public int EncryptMsg(string sReplyMsg, string sTimeStamp, string sNonce, ref string sEncryptMsg)
{
if (m_sEncodingAESKey.Length!=43)
{
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
}
string raw = "";
try
{
raw = Cryptography.AES_encrypt(sReplyMsg, m_sEncodingAESKey, m_sReceiveId);
}
catch (Exception)
{
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_EncryptAES_Error;
}
string MsgSigature = "";
int ret = 0;
ret = GenarateSinature(m_sToken, sTimeStamp, sNonce, raw, ref MsgSigature);
if (0 != ret)
return ret;
sEncryptMsg = "";
string EncryptLabelHead = "<Encrypt><![CDATA[";
string EncryptLabelTail = "]]></Encrypt>";
string MsgSigLabelHead = "<MsgSignature><![CDATA[";
string MsgSigLabelTail = "]]></MsgSignature>";
string TimeStampLabelHead = "<TimeStamp><![CDATA[";
string TimeStampLabelTail = "]]></TimeStamp>";
string NonceLabelHead = "<Nonce><![CDATA[";
string NonceLabelTail = "]]></Nonce>";
sEncryptMsg = sEncryptMsg + "<xml>" + EncryptLabelHead + raw + EncryptLabelTail;
sEncryptMsg = sEncryptMsg + MsgSigLabelHead + MsgSigature + MsgSigLabelTail;
sEncryptMsg = sEncryptMsg + TimeStampLabelHead + sTimeStamp + TimeStampLabelTail;
sEncryptMsg = sEncryptMsg + NonceLabelHead + sNonce + NonceLabelTail;
sEncryptMsg += "</xml>";
return 0;
}
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;
}
}
//Verify Signature
private static int VerifySignature(string sToken, string sTimeStamp, string sNonce, string sMsgEncrypt, string sSigture)
{
string hash = "";
int ret = 0;
ret = GenarateSinature(sToken, sTimeStamp, sNonce, sMsgEncrypt, ref hash);
if (ret != 0)
return ret;
if (hash == sSigture)
return 0;
else
{
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateSignature_Error;
}
}
public static int GenarateSinature(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)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ComputeSignature_Error;
}
sMsgSignature = hash;
return 0;
}
}
}
WXBizMsgCrypt.cs
2.2 Cryptography.cs
该文件封装了AES加解密过程
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;
using System.Net;
namespace Entity
{
public class Cryptography
{
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;
}
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);
}
private 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;
}
private 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;
}
}
}
Cryptography.cs
3.编写回调API
3.1 支持Http Get请求验证URL有效性
假设企业的接收消息的URL设置为http://api.com/callback/interAspect
企业管理员在保存回调配置信息时，企业微信会发送一条验证消息到填写的URL，请求内容如下：
请求方式：GET
请求地址：http://api.com/callback/interAspect?msg_signature=ASDFQWEXZCVAQFASDFASDFSS×tamp=13500001234&nonce=123412323&echostr=ENCRYPT_STR
参数说明：
| 参数 | 类型 | 说明 |
|---|---|---|
| msg_signature | String | 企业微信加密签名，msg_signature计算结合了企业填写的token、请求中的timestamp、nonce、加密的消息体。签名计算方法参考 消息体签名检验 |
| timestamp | Integer | 时间戳。与nonce结合使用，用于防止请求重放攻击。 |
| nonce | String | 随机数。与timestamp结合使用，用于防止请求重放攻击。 |
| echostr | String | 加密的字符串。需要解密得到消息内容明文，解密后有random、msg_len、msg、receiveid四个字段，其中msg即为消息内容明文 |
[HttpGet, Route("callback/interAspect")]
public ContentResult ReveiceMsg(string msg_signature,string timestamp,string nonce,string echostr)
{
//验证
WXBizMsgCrypt wxcpt = new WXBizMsgCrypt(AppSetting.Configuration["Wx:CallBackToken"]
, AppSetting.Configuration["Wx:EncodingAESKey"]
, AppSetting.Configuration["Wx:corpid"]);
int ret = 0;
string sEchoStr = "";
ret = wxcpt.VerifyURL(msg_signature, timestamp, nonce, echostr, ref sEchoStr);
if (ret != 0)
{
return Content(null);
}
return Content(sEchoStr);
}
3.2支持Http Post请求接收业务数据
假设企业的接收消息的URL设置为http://api.com/callback/interAspect。
当用户触发回调行为时，企业微信会发送回调消息到填写的URL，请求内容如下：
请求方式：POST
请求地址 ：http://api.com/callback/interAspect?msg_signature=ASDFQWEXZCVAQFASDFASDFSS×tamp=13500001234&nonce=123412323
参数说明：
| 参数 | 类型 | 说明 |
|---|---|---|
| msg_signature | String | 企业微信加密签名，msg_signature结合了企业填写的token、请求中的timestamp、nonce参数、加密的消息体 |
| timestamp | Integer | 时间戳。与nonce结合使用，用于防止请求重放攻击。 |
| nonce | String | 随机数。与timestamp结合使用，用于防止请求重放攻击。 |
| ToUserName | String | 企业微信的CorpID，当为第三方应用回调事件时，CorpID的内容为suiteid |
| AgentID | String | 接收的应用id，可在应用的设置页面获取。仅应用相关的回调会带该字段。 |
| Encrypt | String | 消息结构体加密后的字符串 |
其中Encrypt为Xml格式，需要从请求体获取。
[HttpPost, Route("callback/interAspect")]
public ContentResult AcceptMessage(string msg_signature,string timestamp,string nonce)
{
//获取Encrypt参数
string encrypt = "";
using (StreamReader sr = new StreamReader(Request.Body, Encoding.UTF8))
{
encrypt = sr.ReadToEndAsync().Result;
}
//验证
WXBizMsgCrypt wxcpt = new WXBizMsgCrypt(AppSetting.Configuration["Wx:CallBackToken"]
, AppSetting.Configuration["Wx:EncodingAESKey"]
, AppSetting.Configuration["Wx:corpid"]);
string sMsg = ""; // 解析之后的明文
int ret = wxcpt.DecryptMsg(msg_signature, timestamp, nonce, encrypt, ref sMsg);
if (ret != 0)
{
throw new Exception();
}
// ret==0表示解密成功，sMsg表示解密之后的明文xml串
XmlDocument doc = new XmlDocument();
doc.LoadXml(sMsg);
XmlNode root = doc.FirstChild;
string userName = root["FromUserName"].InnerText;
string eventKey = root["EventKey"].InnerText;
string responseCode = root["ResponseCode"].InnerText;
//这边写回调业务逻辑
return Content("成功");
}
4.写在最后
1.测试回调模式地址,位置建立连接 => 测试回调模式，用于测试Get接口是否具备解密能力，
链接https://open.work.weixin.qq.com/wwopen/devtool/interface/combine
2.openapi回调地址请求不通过: https://www.cnblogs.com/zspwf/p/16381688.html
3. POST回调不执行: 可能产生的原因有错误接收Encrypt参数，需注意Encrypt参数为Xml类型。Post无法调试，需发布到服务器中，可通过输出到系统日志，获取报错原因。
4.域名必须为公网域名。
标签：Core,aes,return,string,int,微信,Length,byte,NET 来源： https://www.cnblogs.com/zspwf/p/16381643.html