stm32/hash: Clear HMAC mode bit when hashing

Running a hash after a hmac would hang, the CR.MODE bit isn't cleared by
INIT.

Test it by running the test twice.

2 files changed, 3 insertions, 0 deletions

diff --git a/embassy-stm32/CHANGELOG.md b/embassy-stm32/CHANGELOG.md
index 0c2d23246..9ad117312 100644
--- a/embassy-stm32/CHANGELOG.md
+++ b/embassy-stm32/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased - ReleaseDate
 
 - fix: Fix vrefbuf building with log feature
+- fix: Fix performing a hash after performing a hmac
 
 ## 0.3.0 - 2025-08-12
 
diff --git a/embassy-stm32/src/hash/mod.rs b/embassy-stm32/src/hash/mod.rs
index e62151bb5..a4c275242 100644
--- a/embassy-stm32/src/hash/mod.rs
+++ b/embassy-stm32/src/hash/mod.rs
@@ -198,6 +198,8 @@ impl<'d, T: Instance, M: Mode> Hash<'d, T, M> {
             if key.len() > 64 {
                 T::regs().cr().modify(|w| w.set_lkey(true));
             }
+        } else {
+            T::regs().cr().modify(|w| w.set_mode(false));
         }
 
         T::regs().cr().modify(|w| w.set_init(true));