How to convert HMAC Hash from python to node.js

Question

I want to convert this snippet to Nodejs.

import urllib.request
import base64
import hmac

signature = hmac.new(SECRETKEY.encode("utf-8"), my_string.encode("utf-8"), digestmod="sha256").digest()
urllib.parse.quote(base64.b64encode(signature))

How Can I do that to get exactly the same result?
I try this But it's wrong:

const Base64 = require('crypto-js/enc-base64');
const hmacSHA256  = require('crypto-js/hmac-sha256');

let signature = hmacSHA256(utf8.encode(my_string), utf8.encode(SECRETKEY));
signature = Base64.stringify(signature);

Topaco · Accepted Answer · 2023-01-11 13:53:07Z

With NodeJS the crypto module can be used to generate the HMAC.

URL encoding is possible e.g. with encodeURIComponent(). Note that urllib.parse.quote() does not URL encode / by default, so only + and = are URL encoded in a Base64 encoded string. On the other hand, encodeURIComponent() encodes all three special characters.
If this behavior is to be maintained in the NodeJS code, / must be URL-decoded back when encodeURIComponent() is applied (e.g. via a regular expression). Alternatively, instead of encodeURIComponent(), only + and = could be URL encoded directly using regular expressions.

const crypto = require('crypto');

var SECRETKEY = 'SECRETKEY'
var my_string = 'my_string';
var b64Hmac = crypto.createHmac('sha256', SECRETKEY).update(my_string).digest('base64');
var urlB64Hmac = encodeURIComponent(b64Hmac).replace(/%2F/g, "/"); // Remove replace() if / may also be URL-encoded...
console.log(urlB64Hmac); // aB3nu4l%2BN2jf2Z9ybad6vAPVEE8JbHlya/NYlKyJLsM%3D

Alternatively, the CryptoJS library can be used as in your sample code:

var CryptoJS = require('crypto-js')

var SECRETKEY = 'SECRETKEY'
var my_string = 'my_string';
var b64Hmac = CryptoJS.HmacSHA256(my_string, SECRETKEY).toString(CryptoJS.enc.Base64);
var urlB64Hmac = encodeURIComponent(b64Hmac).replace(/%2F/g, "/");
console.log(urlB64Hmac); // aB3nu4l%2BN2jf2Z9ybad6vAPVEE8JbHlya/NYlKyJLsM%3D

However, the advantage of the crypto module over the CryptoJS library is that no additional dependency is needed.

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