nia
2fa1bbac80
Rename it from freebsd.rs to sysctl_arandom.rs. NetBSD has been patching rustc for some time to use the FreeBSD implementation because every single invocation of the compiler may drain from the entropy pool and cause the next to block. This can massively inflate build times for rust software, or cause it to fail entirely, especially in VMs (for example, our Xen package building cluster).
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 = "0.1"
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)
}
Features
This library is no_std for every supported target. However, getting randomness
usually requires calling some external system API. This means most platforms
will require linking against system libraries (i.e. libc for Unix,
Advapi32.dll for Windows, Security framework on iOS, etc...).
The log library is supported as an optional dependency. If enabled, error
reporting will be improved on some platforms.
For the wasm32-unknown-unknown target, one of the following features should be
enabled:
By default, compiling getrandom for an unsupported target will result in
a compilation error. If you want to build an application which uses getrandom
for such target, you can either:
- Use
[replace]or[patch]section in yourCargo.tomlto switch to a custom implementation with a support of your target. - Enable the
dummyfeature to have getrandom use an implementation that always fails at run-time on unsupported targets.
Minimum Supported Rust Version
This crate requires Rust 1.32.0 or later.
License
The getrandom library is distributed under either of
at your option.