Migrating away from this gem

[toby-babu]

Hi,

We have an app that has used Scrypt for a long time. We are currently trying to move away from this and planning to use a 3rd party product for auth. But we have a number of customers using the hash generated by this gem. We were hoping to migrate the users to our new platform by using the same configs and parameters used to generate the password hashes. But that doesn't seem to work.
We created a new hash, figured out the values for n, r, p, salt and secret and generated the hash using

scrypt/lib/scrypt/engine.rb

Line 73 in f1aef42

salt + '$' + scrypt(secret.to_s, salt_only, cost, key_len).unpack('H*').first.rjust(key_len * 2, '0')

This was found to be the same as the hash that was generated when we use this library.
But when we try to regenerate this same hash using some other product using the same params, we were not successful.
An example is this tool: https://www.browserling.com/tools/scrypt
Our 3rd party product and this tool got the same hash with these params and the hash was different from the one generated by this gem. Can I get some help in navigating this?

Thanks,
Toby