scrypt VS browserify

Check out the scrypt encryption tool.

Given that the encryption algorithm is open source (https://github.com/Tarsnap/scrypt) can you try to explain what you mean here?

I wouldn't use OpenSSL personally. If you just need simple but secure symmetric encryption, checkout the scrypt(1) encryption utility from Tarsnap. If you need support for public keys, check out age(1).

scrypt if you strictly only need symmetric encryption.

^ "scrypt page on the Tarsnap website". Retrieved 21 January 2014.

First of all I know that "implementing your own cryptography is bad". However, at some point, one does stumble upon a use-case that is not (well) covered by existing tools.

Now, assuming one has already done his due-diligence and has read (and hopefully understood at least the main ideas of) cryptography related articles / posts / etc. (especially in the area pertaining to what one wants to build), and thus we can assume one is not a complete newbie in this mater, however, nor is he an expert. Basically we can assume he is an "amateur".

Where would one go with his design to ask for feedback about it, in the hope to at least eliminate some weaknesses that one (as a non expert) might have overlooked. (I'm not speaking here about "proofs" or "audits".)

----

More specifically ---- but please let's not get into this right now, this being just an example ---- I'm trying to implement something similar to `scrypt` (the encryption utility, that uses the `scrypt` PBKDF, ) or `age` (), as a replacement to my current solution that relies on GnuPG.

It entirely does and that's exactly my point. Most "hashes" are designed to be fast, for data validation/checking whatever. For securing data (passwords, anonymisation, etc) you want a "hash" to be as slow as possible. Scrypt for example is designed to be extremely slow and use much memory (making GPU-based parallelisation useless and driving up the cost of CPU-based work). The default settings for five-second hashes changes their 18 hour estimate to a bit over two years... and that's assuming you don't turn it up further.

Browserify to use node packages in the browser.

Browserify is a widely used JavaScript bundler with over 2 million NPM weekly downloads. In addition to Node.js support, allowing developers to use require() statements in the browser is one of its highlighted features.

This began to change when NPM came in and running npm install became a quick and easy way to install dependencies. Browserify became the first JavaScript bundler. As its documentation says -

Using Npm Module with Browserify

https://www.npmjs.com/package/browserify probably a little old school, but browserify is probably good enough.

One problem was to run jsDOM as UMD module. But luckly I was able to use browserify to compile jsDOM into UMD.

Browserify

https://browserify.org/ is an easy one to get started with.