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# getrandom
[![Build Status]][GitHub Actions] [![Crate]][crates.io] [![Documentation]][docs.rs] [![Dependency Status]][deps.rs] [![Downloads]][crates.io] [![License]][LICENSE-MIT]
[GitHub Actions]: https://github.com/rust-random/getrandom/actions?query=workflow:Tests+branch:master
[Build Status]: https://github.com/rust-random/getrandom/actions/workflows/tests.yml/badge.svg?branch=master
[crates.io]: https://crates.io/crates/getrandom
[Crate]: https://img.shields.io/crates/v/getrandom
[docs.rs]: https://docs.rs/getrandom
[Documentation]: https://docs.rs/getrandom/badge.svg
[deps.rs]: https://deps.rs/repo/github/rust-random/getrandom
[Dependency Status]: https://deps.rs/repo/github/rust-random/getrandom/status.svg
[Downloads]: https://img.shields.io/crates/d/getrandom
[LICENSE-MIT]: https://raw.githubusercontent.com/rust-random/getrandom/master/LICENSE-MIT
[License]: https://img.shields.io/crates/l/getrandom
A Rust library for retrieving random data from (operating) system sources. It is
assumed that the 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`].
[`rand`]: https://crates.io/crates/rand
## Usage
Add this to your `Cargo.toml`:
```toml
[dependencies]
getrandom = "0.2"
```
Then invoke the `getrandom` function:
```rust
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](https://docs.rs/getrandom/latest) and
[`getrandom::Error` documentation](https://docs.rs/getrandom/latest/getrandom/struct.Error.html).
## Minimum Supported Rust Version
This crate requires Rust 1.36.0 or later.
# License
The `getrandom` library is distributed under either of
* [Apache License, Version 2.0](LICENSE-APACHE)
* [MIT license](LICENSE-MIT)
at your option.
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