Bug: 159928678

Clone this repo:
  1. c16f380 Mark ab/6881855 as merged by Xin Li · 9 weeks ago master
  2. 5d61e2e TEST_MAPPING: test dependers of this crate am: 4c659467bb by Jeff Vander Stoep · 3 months ago
  3. 4c65946 TEST_MAPPING: test dependers of this crate by Jeff Vander Stoep · 3 months ago
  4. b3f8ee5 Skip ab/6749736 in stage. by Xin Li · 4 months ago
  5. 5a89508 Add getrandom/OWNERS am: c9a717869c am: e970e87ba9 am: 17f3fd138d am: fa7bf14d7c by Chih-Hung Hsieh · 4 months ago


Build Status Build Status Crate Documentation Dependency status

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.


Add this to your Cargo.toml:

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)?;


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 your Cargo.toml to switch to a custom implementation with a support of your target.
  • Enable the dummy feature 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.


The getrandom library is distributed under either of

at your option.