example-electron-license-activation VS rand

I’m currently developing a commercial product with Rust and I was wondering what the best way to distribute and sell licenses for it is. Should I use a third party like keygen or is there an easy way I could get started on implementing my own. I’m out of my depth when it comes to software licensing so I figure I should ask before assuming it’s a task I can take on myself.

have you checked https://keygen.sh/, yoyll get ideas there

Some sort of customer portal (or spreadsheet), where the customer can add, remove licences. After payment/confirmation you simply generate a json and encrypt with an async key. In your soft you read that as config file input, that will limit how many users can be created etc. keygen.sh or any other tool might also do it.

Making compatibility promises for distributions means they cannot take advantage of potential advancements in the field.

Defining an error type that is meaningful, portable, and compatible with no-std isn't straightforward. If the std lib's getrandom requires std, then just like that, rand and many other crates won't use it anyway. Using io::Result seems to me to face this challenge.

Some wasm targets can’t generate random numbers at all but in the case of the book because you are using wasm in a browser you can use JS to generate random numbers. I believe there’s a way to get the rand crate to use JS as the backend for generating rand but its a bit more convoluted than the easy one-liner that the book suggests.

rand

This uses rand and xcomplex to handle the mathematics, png to write image files, and dialoguer and indicatif for some pretty prompts and progress bars.

You can often achieve this without any unsafe by putting an assert!() on the length before the hot loop. For example, I got rid of some unsafe in rand that way.

This is a widely used method to map random integers to floating point numbers, but it has the disadvantage of wasting 1 bit of float mantissa precision.

On modern CPUs, its computational advantage over full-precision mapping methods, such as multiplication by a float, is not always clear [1].

[1] https://github.com/rust-random/rand/issues/416

In fact, there are a lot of crates in Rust where in other programming languages, it would be included in the standard library. Examples are regex, random number generators, additional iterator methods, macros for other collections, num traits, loggers, HTTP libraries, error handling, async runtimes, serialization and deserialization, date and time, and many more.