Remove ReseedingRng (#1722)

Author: dhardy

CHANGELOG.md

@@ -28,9 +28,13 @@ You may also find the [Upgrade Guide](https://rust-random.github.io/book/update.
 - Pub export `Xoshiro128PlusPlus`, `Xoshiro256PlusPlus` prngs (#1649)
 - Pub export `ChaCha8Rng`, `ChaCha12Rng`, `ChaCha20Rng` behind `chacha` feature (#1659)
 
+### Removals
+- Removed `ReseedingRng` ([#1722])
+
 [#1695]: https://github.com/rust-random/rand/pull/1695
 [#1697]: https://github.com/rust-random/rand/pull/1697
 [#1717]: https://github.com/rust-random/rand/pull/1717
+[#1722]: https://github.com/rust-random/rand/pull/1722
 
 ## [0.9.2] - 2025-07-20
 ### Deprecated

benches/benches/generators.rs

@@ -7,19 +7,18 @@
 // except according to those terms.
 
 use chacha20::rand_core::UnwrapErr;
-use chacha20::{ChaCha8Rng, ChaCha12Rng, ChaCha20Core, ChaCha20Rng};
+use chacha20::{ChaCha8Rng, ChaCha12Rng, ChaCha20Rng};
 use core::time::Duration;
 use criterion::measurement::WallTime;
 use criterion::{BenchmarkGroup, Criterion, black_box, criterion_group, criterion_main};
 use rand::prelude::*;
-use rand::rngs::ReseedingRng;
 use rand::rngs::SysRng;
 use rand_pcg::{Pcg32, Pcg64, Pcg64Dxsm, Pcg64Mcg};
 
 criterion_group!(
     name = benches;
     config = Criterion::default();
-    targets = random_bytes, random_u32, random_u64, init_gen, init_from_u64, init_from_seed, reseeding_bytes
+    targets = random_bytes, random_u32, random_u64, init_gen, init_from_u64, init_from_seed
 );
 criterion_main!(benches);
 
@@ -189,30 +188,3 @@ pub fn init_from_seed(c: &mut Criterion) {
 
     g.finish()
 }
-
-pub fn reseeding_bytes(c: &mut Criterion) {
-    let mut g = c.benchmark_group("reseeding_bytes");
-    g.warm_up_time(Duration::from_millis(500));
-    g.throughput(criterion::Throughput::Bytes(1024 * 1024));
-
-    fn bench(g: &mut BenchmarkGroup<WallTime>, thresh: u64) {
-        let name = format!("chacha20_{thresh}k");
-        g.bench_function(name.as_str(), |b| {
-            let mut rng = ReseedingRng::<ChaCha20Core, _>::new(thresh * 1024, SysRng).unwrap();
-            let mut buf = [0u8; 1024 * 1024];
-            b.iter(|| {
-                rng.fill_bytes(&mut buf);
-                black_box(&buf);
-            });
-        });
-    }
-
-    bench(&mut g, 4);
-    bench(&mut g, 16);
-    bench(&mut g, 32);
-    bench(&mut g, 64);
-    bench(&mut g, 256);
-    bench(&mut g, 1024);
-
-    g.finish()
-}

src/rngs/mod.rs

@@ -94,9 +94,6 @@
 //! [PCG]: https://www.pcg-random.org/
 //! [xoshiro]: https://prng.di.unimi.it/
 
-mod reseeding;
-pub use reseeding::ReseedingRng;
-
 #[cfg(feature = "small_rng")]
 mod small;
 #[cfg(feature = "small_rng")]