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//! Prng utilities.
use std::convert::Infallible;
/// Helper to implement rand_core_06 for an Rng providing RngCore from rand_core 0.9.
///
/// We need this (for now) for compatibility with *-dalek and
/// some other crypto libraries.
/// (Please avoid propagating this type outside of the tor-llcrypto crate.
/// If you need it for a legacy crypto tool, it is usually better to wrap
/// that tool with an API that uses RngCompat.)
#[cfg_attr(feature = "rng-compat", visibility::make(pub))]
pub struct RngCompat<R>(R);
impl<R> RngCompat<R> {
/// Create a ne RngCompat to wrap `rng`
pub(crate) fn new(rng: R) -> Self {
Self(rng)
}
impl<R: rand_core::Rng> rand_core_06::RngCore for RngCompat<R> {
fn next_u32(&mut self) -> u32 {
self.0.next_u32()
fn next_u64(&mut self) -> u64 {
self.0.next_u64()
fn fill_bytes(&mut self, dest: &mut [u8]) {
self.0.fill_bytes(dest);
fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), rand_core_06::Error> {
Ok(())
impl<R: rand_core::CryptoRng> rand_core_06::CryptoRng for RngCompat<R> {}
impl<R: rand_core_06::RngCore> rand_core::TryRng for RngCompat<R> {
type Error = Infallible;
fn try_next_u32(&mut self) -> Result<u32, Infallible> {
Ok(self.0.next_u32())
fn try_next_u64(&mut self) -> Result<u64, Infallible> {
Ok(self.0.next_u64())
fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Infallible> {
impl<R: rand_core_06::CryptoRng + rand_core_06::RngCore> rand_core::TryCryptoRng for RngCompat<R> {}