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// 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 MacOS / iOS
extern crate libc;
use rand_core::{Error, ErrorKind};
use super::OsRngImpl;
use std::io;
use self::libc::{c_int, size_t};
#[derive(Clone, Debug)]
pub struct OsRng;
enum SecRandom {}
#[allow(non_upper_case_globals)]
const kSecRandomDefault: *const SecRandom = 0 as *const SecRandom;
#[link(name = "Security", kind = "framework")]
extern {
fn SecRandomCopyBytes(rnd: *const SecRandom,
count: size_t, bytes: *mut u8) -> c_int;
}
impl OsRngImpl for OsRng {
fn new() -> Result<OsRng, Error> { Ok(OsRng) }
fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
let ret = unsafe {
SecRandomCopyBytes(kSecRandomDefault,
dest.len() as size_t,
dest.as_mut_ptr())
};
if ret == -1 {
Err(Error::with_cause(
ErrorKind::Unavailable,
"couldn't generate random bytes",
io::Error::last_os_error()))
} else {
Ok(())
}
}
fn method_str(&self) -> &'static str { "SecRandomCopyBytes" }
}
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