Add x13a/zig-scrypt

[The-King-of-Toasters]

No description provided.

[x13a]

This library is waiting for std. I already made a pull request for that when zig was version 0.7.1, but haven't time to complete. In near future, maybe next week (can't promise) I will redo that.

[The-King-of-Toasters]

Sounds good, I'm using this library on it's own but I might as well wait. BTW, do you think it's possible to make a comptime kdf function if params and derived_key.len are known at compile time?

[x13a]

I don't know zig well enough to help you. This was a golang port heavy modified by @jedisct1. Maybe he answer this.

[x13a]

The stopper with comptime scrypt can be that it requires much memory allocation (depends on params). This is done on the heap. Can zig allocate memory on the heap at comptime?

But if you mean some kdf then I suppose yes. Under kdf I mean some function that will hash password using CPU intensive operations.

[jedisct1]

That would be abysmally slow!

What is the use case for running a CPU-hard/memory-hard function at comptime?

[jedisct1]

@setEvalBranchQuota would also need to be tuned accordingly, and even with very low parameters, that would be out of control.

[The-King-of-Toasters]

I had a look again and realised my error, my params would result in a 16k stack! Disregard.

[jedisct1]

16MB (not 16k) memory is the minimum for scrypt, even in low security settings.

[x13a]

@The-King-of-Toasters , merged to std: 9577