diff options
Diffstat (limited to 'getrandom/README.md')
| -rw-r--r-- | getrandom/README.md | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/getrandom/README.md b/getrandom/README.md new file mode 100644 index 0000000..01bbfb5 --- /dev/null +++ b/getrandom/README.md @@ -0,0 +1,78 @@ +# getrandom + +[](https://travis-ci.org/rust-random/getrandom) +[](https://ci.appveyor.com/project/rust-random/getrandom) +[](https://crates.io/crates/getrandom) +[](https://docs.rs/getrandom) +[](https://deps.rs/repo/github/rust-random/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`]. + +[`rand`]: https://crates.io/crates/rand + +## Usage + +Add this to your `Cargo.toml`: + +```toml +[dependencies] +getrandom = "0.1" +``` + +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) +} +``` + +## 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: + +- [`wasm-bindgen`](https://crates.io/crates/wasm_bindgen) +- [`stdweb`](https://crates.io/crates/stdweb) + +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]`][replace] or [`[patch]`][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. + +[replace]: https://doc.rust-lang.org/cargo/reference/manifest.html#the-replace-section +[patch]: https://doc.rust-lang.org/cargo/reference/manifest.html#the-patch-section + +## Minimum Supported Rust Version + +This crate requires Rust 1.32.0 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. |