| // Copyright 2018 Developers of the Rand project. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| //! Implementation for DragonFly / Haiku / Emscripten |
| |
| use rand_core::Error; |
| use super::random_device; |
| use super::OsRngImpl; |
| use std::fs::File; |
| |
| #[derive(Clone, Debug)] |
| pub struct OsRng(); |
| |
| impl OsRngImpl for OsRng { |
| fn new() -> Result<OsRng, Error> { |
| random_device::open("/dev/random", &|p| File::open(p))?; |
| Ok(OsRng()) |
| } |
| |
| fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> { |
| random_device::read(dest) |
| } |
| |
| #[cfg(target_os = "emscripten")] |
| fn max_chunk_size(&self) -> usize { |
| // `Crypto.getRandomValues` documents `dest` should be at most 65536 |
| // bytes. `crypto.randomBytes` documents: "To minimize threadpool |
| // task length variation, partition large randomBytes requests when |
| // doing so as part of fulfilling a client request. |
| 65536 |
| } |
| |
| fn method_str(&self) -> &'static str { "/dev/random" } |
| } |