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use crate::arch::x86_64::{_rdrand16_step, _rdrand32_step, _rdrand64_step};
const RETRIES: u32 = 10;
fn fail() -> ! {
panic!("failed to generate random data");
}
fn rdrand64() -> u64 {
unsafe {
let mut ret: u64 = 0;
for _ in 0..RETRIES {
if _rdrand64_step(&mut ret) == 1 {
return ret;
}
}
fail();
}
}
fn rdrand32() -> u32 {
unsafe {
let mut ret: u32 = 0;
for _ in 0..RETRIES {
if _rdrand32_step(&mut ret) == 1 {
return ret;
}
}
fail();
}
}
fn rdrand16() -> u16 {
unsafe {
let mut ret: u16 = 0;
for _ in 0..RETRIES {
if _rdrand16_step(&mut ret) == 1 {
return ret;
}
}
fail();
}
}
pub fn fill_bytes(bytes: &mut [u8]) {
let (chunks, remainder) = bytes.as_chunks_mut();
for chunk in chunks {
*chunk = rdrand64().to_ne_bytes();
}
let (chunks, remainder) = remainder.as_chunks_mut();
for chunk in chunks {
*chunk = rdrand32().to_ne_bytes();
}
let (chunks, remainder) = remainder.as_chunks_mut();
for chunk in chunks {
*chunk = rdrand16().to_ne_bytes();
}
if let [byte] = remainder {
*byte = rdrand16() as u8;
}
}
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