Fixed HMAC blocking mode.

Author: caleb-garrett

embassy-stm32/src/hash/mod.rs

@@ -215,7 +215,7 @@ impl<'d, T: Instance, D> Hash<'d, T, D> {
                 self.accumulate_blocking(key);
                 T::regs().str().write(|w| w.set_dcal(true));
                 // Block waiting for digest.
-                while !T::regs().sr().read().dcis() {}
+                while !T::regs().sr().read().dinis() {}
             }
             ctx.key_sent = true;
         }
@@ -365,16 +365,16 @@ impl<'d, T: Instance, D> Hash<'d, T, D> {
         //Start the digest calculation.
         T::regs().str().write(|w| w.set_dcal(true));
 
-        // Block waiting for digest.
-        while !T::regs().sr().read().dcis() {}
-
         // Load the HMAC key if provided.
         if let Some(key) = ctx.key {
+            while !T::regs().sr().read().dinis() {}
             self.accumulate_blocking(key);
             T::regs().str().write(|w| w.set_dcal(true));
-            while !T::regs().sr().read().dcis() {}
         }
 
+        // Block until digest computation is complete.
+        while !T::regs().sr().read().dcis() {}
+
         // Return the digest.
         let digest_words = match ctx.algo {
             Algorithm::SHA1 => 5,