无法在 Cloudflare Worker 脚本上创建 MD5 Hash

Question

I am trying to implement custom authorization of requests, before sending them to microservices, I am using Cloudflare worker scripts for the authorization and I am not able to generate the MD5 hash through worker script.

I have gone through many blogs and articles online but was not able to achieve the end result. Any help is highly appreciated.

Mentioned below is the glimpse of what I am trying to do

 addEventListener('fetch', event => {
    importScripts('https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.9-1/md5.js');
    let test = CryptoJS.MD5('test').toString();
    console.log(test);
    event.respondWith(handleRequest(event.request))
})

Answer 1

You don't need to import external libraries to calculate md5 hash in Cloudflare Workers.

It's supported natively:

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})

/**
 * Respond to the request
 * @param {Request} request
 */
async function handleRequest(request) {
  const message = "Hello world!"
  const msgUint8 = new TextEncoder().encode(message) // encode as (utf-8) Uint8Array
  const hashBuffer = await crypto.subtle.digest('MD5', msgUint8) // hash the message
  const hashArray = Array.from(new Uint8Array(hashBuffer)) // convert buffer to byte array
  const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('') // convert bytes to hex string

  return new Response(hashHex, {status: 200})
}

When triggered, it will respond with 86fb269d190d2c85f6e0468ceca42a20 which is md5 of Hello world! .

Reference:

• https://developers.cloudflare.com/workers/runtime-apis/web-crypto
• https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest

Answer 2

here's an example of Cloudflare Workers hashing without a library, except using the SHA-256 algorithm in place of the obsolete MD5

export default {
  async fetch(request)
  {
    const myText = new TextEncoder().encode('Hello world!');
    const myDigest = await crypto.subtle.digest({ name: 'SHA-256' }, myText);
    const hashArray = Array.from(new Uint8Array(myDigest));
    const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('')
    return new Response(hashHex, {status: 200});
  }
}