1 changed files with 4 additions and 8 deletions
@@ -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>>,