Swap to using bit32.byteswap for blake2s

modules/blake2s/CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Unreleased
+
+- Swap to use built-in `bit32.byteswap` over custom implementation
+
 ## Version 1.0.0
 
 - Initial release

modules/blake2s/init.luau

@@ -18,22 +18,6 @@ local SIGMA = {
 	{ 11, 3, 9, 5, 8, 7, 2, 6, 16, 12, 10, 15, 4, 13, 14, 1 },
 }
 
---[=[
-	Swaps the byte order of `n`. This is in effect changing the endianness
-	of an integer.
-
-	@param n The number to swap the byte order of.
-	@return The endianness-swapped number.
-]=]
-local function byteswap(n: number): number
-	return bit32.bor(
-		bit32.lshift(n, 24),
-		bit32.band(bit32.lshift(n, 8), 0xFF0000),
-		bit32.band(bit32.rshift(n, 8), 0xFF00),
-		bit32.rshift(n, 24)
-	)
-end
-
 --[=[
 	The BLAKE2s compression function.
 
@@ -222,14 +206,14 @@ local function blake2s(message: string, outSize: number, key: string?): string
 	-- TODO efficiency
 	local digest = string.format(
 		"%08x%08x%08x%08x%08x%08x%08x%08x",
-		byteswap(h[1]),
-		byteswap(h[2]),
-		byteswap(h[3]),
-		byteswap(h[4]),
-		byteswap(h[5]),
-		byteswap(h[6]),
-		byteswap(h[7]),
-		byteswap(h[8])
+		bit32.byteswap(h[1]),
+		bit32.byteswap(h[2]),
+		bit32.byteswap(h[3]),
+		bit32.byteswap(h[4]),
+		bit32.byteswap(h[5]),
+		bit32.byteswap(h[6]),
+		bit32.byteswap(h[7]),
+		bit32.byteswap(h[8])
 	)
 
 	return string.sub(digest, 1, outSize * 2)