"Error: No callback provided to pbkdf2" when using async await

Question

我想在 Nodejs 中使用加密模块为 pbkdf2 密码哈希编写一个异步函数。虽然 randomBytes 函数工作正常，但我在运行 pbkdf2 with await 上得到以下错误："Error: No callback provided to pbkdf2".

我知道可以使用 pbkdf2Sync() 来解决，但我不明白为什么异步版本不起作用或者等待同步功能是否正确？

节点 v 8.10.0

async function hashPassword(password){
 let salt;
 let hash;
 let pass;
 try{
  salt = await Crypto.randomBytes(Config.SALT_BYTES);
  hash = await Crypto.pbkdf2(password, salt, Config.ITERATIONS, Config.HASH_BYTES, 'sha512');
  pass = salt+hash;
  return pass;
 }
 catch(err){
  console.log('ERR: ', err);
 }
}

Answer 1

Crypto.pbkdf2() 函数有 6 个参数，第 6 个是必需的回调。

如果您想要同步调用，您应该使用 crypto.pbkdf2Sync()。

Answer 2

一个解决方案是将方法包装在一个承诺中。任何需要回调的方法都可以通过这种方式转换成支持async/await的方法

function pbkdf2Async(password, salt, iterations, keylen, digest) {
    return new Promise( (res, rej) => {
        crypto.pbkdf2(password, salt, iterations, keylen, digest, (err, key) => {
            err ? rej(err) : res(key);
        });
    });
}

Answer 3

util.promisify 添加于：v8.0.0

Takes a function following the common error-first callback style, i.e. taking an (err, value) => ... callback as the last argument, and returns a version that returns promises.

const {promisify} = require('util');
const {randomBytes, pbkdf2} = require('crypto');
const randomBytesAsync = promisify(randomBytes);
const pbkdf2Async = promisify(pbkdf2);

async function hashPassword(password, options = {}){
  let params = Object.assign({
    saltlen: 16,
    iterations: 10000,
    keylen: 64,
    digest: 'sha512'
  }, options) // merge default and provided options
  
  const {saltLen, iterations, keylen, digest} = params;
  const salt = await randomBytesAsync(saltlen);
  const hash = await pbkdf2Async(password, salt, iterations, keylen, digest);  
  return salt + ':' + hash;
}

Full example with generation password hash and checking password

"Error: No callback provided to pbkdf2" when using async await

"Error: No callback provided to pbkdf2" when using async await

pbkdf2

node.js

async-await