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35 lines
1.3 KiB
Rust
35 lines
1.3 KiB
Rust
// Copyright 2019 Developers of the Rand project.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Implementation for macOS
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use crate::util_libc::{last_os_error, Weak};
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use crate::{use_file, Error};
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use core::mem;
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type GetEntropyFn = unsafe extern "C" fn(*mut u8, libc::size_t) -> libc::c_int;
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pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
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static GETENTROPY: Weak = unsafe { Weak::new("getentropy\0") };
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if let Some(fptr) = GETENTROPY.ptr() {
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let func: GetEntropyFn = unsafe { mem::transmute(fptr) };
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for chunk in dest.chunks_mut(256) {
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let ret = unsafe { func(chunk.as_mut_ptr(), chunk.len()) };
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if ret != 0 {
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let err = last_os_error();
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error!("getentropy syscall failed");
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return Err(err);
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}
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}
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Ok(())
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} else {
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// We fallback to reading from /dev/random instead of SecRandomCopyBytes
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// to avoid high startup costs and linking the Security framework.
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use_file::getrandom_inner(dest)
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}
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}
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