javascript - 如何以 express 方式发送比较哈希？服务器到客户端

Question

当客户端向服务器请求用于生成和授权访问文件的哈希值时，我需要回答客户端，如何使用node.js和express确认哈希值等于消息:

    const express = require("express");
    const bodyParser = require("body-parser");
    const request = require("request");
    const sha1 = require('sha1');
    const app = express();
    app.use(express.static("public"));
    app.use(bodyParser.urlencoded({extended: true}));
    app.get('/', function(request, response) {
      var x1 = request.query.x1; 
      var x2 = request.query.x2; 
      var x3 = request.query.x3; 
      var x4 = 654321; 
      var hash = sha1(x2+x3+x4)
    });
    app.listen(process.env.PORT || 3000, function() {
      console.log("Server is running in port 3000!");
    });

Answer 1

您可以使用crypto模块来生成和解码哈希值。这是一个例子。

const resizedIV = Buffer.allocUnsafe(16)
app.get('/', function(request, response) {

    const key = crypto
      .createHash("sha256")
      .update('secret-key')//this should be a secret key
      .digest()

   const cipher = crypto.createCipheriv("aes256", key, resizedIV)

   for (var prop in req.query) {
    if (req.query.hasOwnProperty(prop)) {
    cipher.update(req.query[prop], "binary", "hex")
    }
   }
    const hash = cipher.final("hex")
    res.send(hash)
});

然后你可以像这样解码它

app.get('/decode', function(req, res) {
    const key = crypto
        .createHash("sha256")
        .update('secret-key')
        .digest()

     const decipher = crypto.createDecipheriv("aes256", key, resizedIV),


        decipher.update(req.query.hash, "hex", "binary")


       const decoded = decipher.final("binary")

       res.send(decoded)

})