From b3313d9a9594cf1df727668e7fa9da9eace30c8a Mon Sep 17 00:00:00 2001
From: Artyom Pavlov <newpavlov@gmail.com>
Date: Sun, 12 Nov 2023 16:54:06 +0300
Subject: [PATCH] digest: add DynDigestWithOid wrapper trait (#1390)

---
 digest/src/digest.rs | 9 +++++++++
 digest/src/lib.rs    | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/digest/src/digest.rs b/digest/src/digest.rs
index 0642af43..c8d1ca87 100644
--- a/digest/src/digest.rs
+++ b/digest/src/digest.rs
@@ -3,6 +3,8 @@ use crypto_common::{typenum::Unsigned, Output, OutputSizeUser};
 
 #[cfg(feature = "alloc")]
 use alloc::boxed::Box;
+#[cfg(feature = "const-oid")]
+use const_oid::DynAssociatedOid;
 
 /// Marker trait for cryptographic hash functions.
 pub trait HashMarker {}
@@ -224,3 +226,10 @@ impl Clone for Box<dyn DynDigest> {
         self.box_clone()
     }
 }
+
+/// Convenience wrapper trait around [DynDigest] and [DynAssociatedOid].
+#[cfg(feature = "const-oid")]
+pub trait DynDigestWithOid: DynDigest + DynAssociatedOid {}
+
+#[cfg(feature = "const-oid")]
+impl<T: DynDigest + DynAssociatedOid> DynDigestWithOid for T {}
diff --git a/digest/src/lib.rs b/digest/src/lib.rs
index b076853b..1bb0d532 100644
--- a/digest/src/lib.rs
+++ b/digest/src/lib.rs
@@ -59,6 +59,8 @@ pub use block_buffer;
 pub use const_oid;
 pub use crypto_common;
 
+#[cfg(feature = "const-oid")]
+pub use crate::digest::DynDigestWithOid;
 pub use crate::digest::{Digest, DynDigest, HashMarker};
 pub use crypto_common::{array, typenum, typenum::consts, Output, OutputSizeUser, Reset};
 #[cfg(feature = "mac")]