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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 iOS
use crate::Error;
use core::{ffi::c_void, ptr::null};
#[link(name = "Security", kind = "framework")]
extern "C" {
fn SecRandomCopyBytes(rnd: *const c_void, count: usize, bytes: *mut u8) -> i32;
}
pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
// Apple's documentation guarantees kSecRandomDefault is a synonym for NULL.
let ret = unsafe { SecRandomCopyBytes(null(), dest.len(), dest.as_mut_ptr()) };
// errSecSuccess (from SecBase.h) is always zero.
if ret != 0 {
Err(Error::IOS_SEC_RANDOM)
} else {
Ok(())
}
}
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