From bb7b4c36295b505c7cb8841aab79789c1b71fc94 Mon Sep 17 00:00:00 2001
From: Craig Everett <zxq9@zxq9.com>
Date: Sat, 30 May 2026 15:33:43 +0900
Subject: [PATCH] Replace `case` with a simpler assertion

---
 src/hz_key_master.erl | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/src/hz_key_master.erl b/src/hz_key_master.erl
index 7670843..5f00b1f 100644
--- a/src/hz_key_master.erl
+++ b/src/hz_key_master.erl
@@ -342,14 +342,10 @@ extract(Hash, Salt, IKM) ->
 expand(Hash, PRK, Info, OutLen) ->
     HashLen = hash_size(Hash),
     BlockCount = (OutLen + HashLen - 1) div HashLen,
-    case BlockCount > 255 of
-        true ->
-            error(hkdf_length_too_long);
-        false -> 
-            FullBlocks = expand_loop(Hash, PRK, Info, BlockCount, 1, <<>>, <<>>),
-            <<Output:OutLen/binary, _/binary>> = FullBlocks,
-            Output
-    end.
+    true = BlockCount =< 255,
+    FullBlocks = expand_loop(Hash, PRK, Info, BlockCount, 1, <<>>, <<>>),
+    <<Output:OutLen/binary, _/binary>> = FullBlocks,
+    Output.
 
 expand_loop(Hash, PRK, Info, N, Counter, PrevT, Acc) when Counter =< N ->
     Payload = <<PrevT/binary, Info/binary, Counter:8>>,