From bebd26d89c371ca7d546949b4a9c2e731d54dcae Mon Sep 17 00:00:00 2001
From: Tony Arcieri <bascule@gmail.com>
Date: Sun, 25 Jan 2026 12:58:45 -0700
Subject: [PATCH] crypto-common: add `UnwrapSysRng` alias

Though I think the `Generate` trait covers a lot of use cases, for
anyone who wants to use `SysRng` with `CryptoRng` this is a little more
convenient than importing both `SysRng` and `Unwrap` and assembling it
yourself.
---
 crypto-common/src/lib.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/crypto-common/src/lib.rs b/crypto-common/src/lib.rs
index 164db413f..0a1cedfaa 100644
--- a/crypto-common/src/lib.rs
+++ b/crypto-common/src/lib.rs
@@ -20,7 +20,7 @@ pub use hybrid_array as array;
 pub use hybrid_array::typenum;
 
 #[cfg(feature = "getrandom")]
-pub use getrandom;
+pub use getrandom::{self, SysRng};
 #[cfg(feature = "rand_core")]
 pub use {generate::Generate, rand_core};
 
@@ -33,6 +33,10 @@ use hybrid_array::{
 #[cfg(feature = "rand_core")]
 use rand_core::CryptoRng;
 
+/// [`CryptoRng`] interface for the system's preferred random number source that panics on error.
+#[cfg(feature = "getrandom")]
+pub type UnwrapSysRng = rand_core::UnwrapErr<SysRng>;
+
 /// Block on which [`BlockSizeUser`] implementors operate.
 pub type Block<B> = Array<u8, <B as BlockSizeUser>::BlockSize>;