7aec6c65c1
We can do this update now that `lucet-runtime-internals` no longer pins the `getrandom` crate version; the conflicts around spinlocks have been removed and the new version of `getrandom` brings in an important fix for calling `SYS_getrandom` on some architectures. Depends on D85409 Differential Revision: https://phabricator.services.mozilla.com/D85410
2.8 KiB
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.