用 Express 加密

Question

我有一个问题，来自 npm 的加密包。

我不想将加密的字符串发送到服务器以使用快速路由器参数解密。

但是有一个大问题，如果我输入无效的字符串，服务器会给我这个错误：

TypeError: Bad input string
at Decipher.update (crypto.js:144:26)
at decrypt (APPDIRECTORY\encryption.js:17:22)
at app.get (APPDIRECTORY\encryption.js:35:17)
at Layer.handle [as handle_request] (APPDIRECTORY\node_modules\express\lib\router\layer.js:95:5)
at next (APPDIRECTORY\node_modules\express\lib\router\route.js:137:13)
at Route.dispatch (APPDIRECTORY\node_modules\express\lib\router\route.js:112:3)
at Layer.handle [as handle_request] (APPDIRECTORY\node_modules\express\lib\router\layer.js:95:5)
at APPDIRECTORY\node_modules\express\lib\router\index.js:281:22
at param (APPDIRECTORY\node_modules\express\lib\router\index.js:354:14)
at param (APPDIRECTORY\node_modules\express\lib\router\index.js:365:14)

我只是想知道，如何禁用这个错误，并输入我自己的错误！

谢谢！

编辑：

const express = require('express')
const app = express();

var crypto = require('crypto'),
    algorithm = 'aes-256-ctr',
    password = 'd6F3Efeq';

function encrypt(text){
  var cipher = crypto.createCipher(algorithm,password)
  var crypted = cipher.update(text,'utf8','hex')
  crypted += cipher.final('hex');
  return crypted;
}

function decrypt(text){
  var decipher = crypto.createDecipher(algorithm,password)
  var dec = decipher.update(text,'hex','utf8')
  dec += decipher.final('utf8');
  return dec;
}


app.get('/decrypt/:string', (request, response) => {

  let string = request.params.string;
  response.send(decrypt(string));

})

app.listen(3030, (request, response) => {
  console.log("Server started succesfully!")
})

如果字符串不是 aes-256-ctr 格式，我会出错。那么，如果字符串是 aes-256-ctr 格式，是否有某种方法可以验证字符串？

Answer 1

你只需要try-catch:

function decrypt(text){
  try {
    var decipher = crypto.createDecipher(algorithm,password)
    var dec = decipher.update(text,'hex','utf8')
    dec += decipher.final('utf8');
    return { result: dec };
  } catch(err) {
    return { error: 'INVALID_ENCRYPTED_TEXT' };
  }
}


app.get('/decrypt/:string', (request, response) => {
  let string = request.params.string;
  const dec = decrypt(string);
  if (dec.error) {
    response.status(400).end();
  } else {
    response.send(dec.result);
  }
});

用 Express 加密

Crypto with Express

string

encryption

validation

node.js

cryptojs