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// SPDX-License-Identifier: GPL-2.0
use core::convert::TryInto;
use crate::{bindings, c_types, error};
/// Fills `dest` with random bytes generated from the kernel's CSPRNG. Ensures
/// that the CSPRNG has been seeded before generating any random bytes, and
/// will block until it's ready.
pub fn getrandom(dest: &mut [u8]) -> error::KernelResult<()> {
let res = unsafe { bindings::wait_for_random_bytes() };
if res != 0 {
return Err(error::Error::from_kernel_errno(res));
}
unsafe {
bindings::get_random_bytes(
dest.as_mut_ptr() as *mut c_types::c_void,
dest.len().try_into()?,
);
}
Ok(())
}
/// Fills `dest` with random bytes generated from the kernel's CSPRNG. If the
/// CSPRNG is not yet seeded, returns an `Err(EAGAIN)` immediately.
pub fn getrandom_nonblock(dest: &mut [u8]) -> error::KernelResult<()> {
if !unsafe { bindings::rng_is_initialized() } {
return Err(error::Error::EAGAIN);
}
getrandom(dest)
}
/// Contributes the contents of `data` to the kernel's entropy pool. Does _not_
/// credit the kernel entropy counter though.
pub fn add_randomness(data: &[u8]) {
unsafe {
bindings::add_device_randomness(
data.as_ptr() as *const c_types::c_void,
data.len().try_into().unwrap(),
);
}
}
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