How can i check a PHP MD5 hash with number type in nodejs server

I’m trying to generate a MD5 hash code in NodeJS and compare it with a php-generated MD5 hash code with number type ex: md5(10). NodeJS does not seem to have a way to generate a MD5 hash with number type only – only String, Buffer, Array or Uint8Array types are supported.

I tried storing the number into a buffer, or a binary list but I did not manage to match the php-generated hash :

var buffer = new Buffer(16);
buffer.writeDoubleBE(10)
return crypto.createHash("md5").update(buffer).digest("hex");

// result : c6df1eeac30ad1fab5b50994e09033fb
// PHP-generated hash : md5(10) = d3d9446802a44259755d38e6d163e820

What exactly MD5 in php do with the data type ?
Which data form should i use to get the same result ?

Answer

The md5 function in PHP calculates the hash of a string, so in your example it’s actually calculating the hash of “10”.

To do this in Node.js should be quite simple:

const dataToHash = Buffer.from(String(10), "utf-8");
const hash = crypto.createHash("md5").update(dataToHash).digest("hex");
console.log("Hash:", hash);

We get the same result in Node.js as in PHP, e.g.

Hash: d3d9446802a44259755d38e6d163e820