vendor/getrandom-0.1.16/src/ios.rs

   1 // Copyright 2018 Developers of the Rand project.
   2 //
   3 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   4 // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   5 // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
   6 // option. This file may not be copied, modified, or distributed
   7 // except according to those terms.
   8
   9 //! Implementation for iOS
  10 use crate::{error::SEC_RANDOM_FAILED, Error};
  11
  12 // TODO: Make extern once extern_types feature is stabilized. See:
  13 //   https://github.com/rust-lang/rust/issues/43467
  14 #[repr(C)]
  15 struct SecRandom([u8; 0]);
  16
  17 #[link(name = "Security", kind = "framework")]
  18 extern "C" {
  19     static kSecRandomDefault: *const SecRandom;
  20
  21     fn SecRandomCopyBytes(rnd: *const SecRandom, count: usize, bytes: *mut u8) -> i32;
  22 }
  23
  24 pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
  25     let ret = unsafe { SecRandomCopyBytes(kSecRandomDefault, dest.len(), dest.as_mut_ptr()) };
  26     if ret == -1 {
  27         Err(SEC_RANDOM_FAILED)
  28     } else {
  29         Ok(())
  30     }
  31 }