如何在post params中发送加密数据

Question

From your app, 
POST https://api.quikr.com/app/auth/access_token 
Content-Type: application/json { “appId” : “app id”, “signature" : “”} 

signature = Hmac-sha1 ("app_secret", data) 
where data = email + appId + today’s date in yyyy-MM-dd format 
Response will contain the 'token' and the 'token_id'.

这是文件，

https://developer.quikr.com/index.php/documentation#developer_api

根据它，生成访问令牌

我尝试如下，但此代码显示错误，

{error: true, message: "Invalid input Data"}

我的代码，

 this.data = 't@gmail.com12342018-01-31';
  var postData = {'appId':1242,'signature':Md5.hashStr("7777eh3y3ebe3y3e",this.data)};
var headers = new Headers();
headers.append('Content-Type', 'application/json');
this.http.post('https://api.quikr.com/app/auth/access_token', postData, { headers: headers })

任何人都可以建议我帮忙。谢谢。