From 54581b30a8ca8f04e34869160f185d2bfa1c8205 Mon Sep 17 00:00:00 2001
From: Mamy Ratsimbazafy <mamy_github@numforge.co>
Date: Wed, 25 Sep 2024 17:08:59 +0200
Subject: [PATCH] fix: template typechecking is more stringent

---
 constantine/ciphers/chacha20.nim | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/constantine/ciphers/chacha20.nim b/constantine/ciphers/chacha20.nim
index 80f8ee0a..42600799 100644
--- a/constantine/ciphers/chacha20.nim
+++ b/constantine/ciphers/chacha20.nim
@@ -28,7 +28,7 @@ template rotl(x, n: uint32): uint32 =
   # We always use it with constants in 0 ..< 32
   # so no undefined behaviour.
   (x shl n) or (x shr (32 - n))
-template `^=`(x: var uint32, y: uint32) =
+template `^=`[T: uint32|byte](x: var T, y: T) =
   x = x xor y
 template `<<<=`(x: var uint32, n: uint32) =
   x = x.rotl(n)
@@ -126,4 +126,4 @@ func chacha20_cipher*(
     eaten += 64
     counter += 1
 
-  return counter
\ No newline at end of file
+  return counter