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chacha20stream/src/bytes.rs

30 lines
605 B

use std::ffi::c_void;
use std::ptr;
#[cfg(nightly)]
#[inline(never)]
pub fn explicit_prune(buffer: &mut[u8]) {
unsafe {
ptr::write_bytes(buffer.as_mut_ptr() as *mut c_void, 0, buffer.len());
if cfg!(target_arch = "x86_64") || cfg !(target_arch = "x86") {
asm!("clflush [{}]", in(reg)buffer.as_mut_ptr());
} else {
asm!("")
}
}
}
#[cfg(not(nightly))]
#[inline]
pub fn explicit_prune(buffer: &mut[u8]) {
extern "C" {
fn explicit_bzero(_: *mut c_void, _:usize);
}
unsafe {
explicit_bzero(buffer.as_mut_ptr() as *mut c_void, buffer.len());
}
}