Joseph Richey
2ec38ad931
This PR adds some tests which make sure calls to getrandom (for both small and large buffers) "look" random.
While we could certainly add more complicated randomness tests, these simple tests are:
- Very easy to understand
- Don't require any external crates
- Makes sure we aren't doing something obviously stupid like
- forgetting [these lines](https://github.com/rust-random/getrandom/blob/bd0654fe70980583e51573e755bafa3b2f8342d9/src/rdrand.rs#L91-L95)
- failing to initialize every other byte
- initializing some significant fraction of bytes with a constant
As this tests all buffer sizes from 1 to 64, it also fixes #290.
getrandom
A Rust library for retrieving random data from (operating) system source. It is
assumed that system always provides high-quality cryptographically secure random
data, ideally backed by hardware entropy sources. This crate derives its name
from Linux's getrandom function, but is cross platform, roughly supporting
the same set of platforms as Rust's std lib.
This is a low-level API. Most users should prefer using high-level random-number
library like rand.
Usage
Add this to your Cargo.toml:
[dependencies]
getrandom = "0.2"
Then invoke the getrandom function:
fn get_random_buf() -> Result<[u8; 32], getrandom::Error> {
let mut buf = [0u8; 32];
getrandom::getrandom(&mut buf)?;
Ok(buf)
}
For more information about supported targets, entropy sources, no_std targets,
crate features, WASM support and Custom RNGs see the
getrandom documentation and
getrandom::Error documentation.
Minimum Supported Rust Version
This crate requires Rust 1.36.0 or later.
License
The getrandom library is distributed under either of
at your option.