From 888fca0617aa9b99c8722b6476b3075225661202 Mon Sep 17 00:00:00 2001
From: Priyanshu Singh <123263608+dev-priyanshu15@users.noreply.github.com>
Date: Sat, 12 Oct 2024 16:02:42 +0530
Subject: [PATCH] Create fletcher32.go

add hacktoberfest-label please
---
 checksum/fletcher32.go | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 checksum/fletcher32.go

diff --git a/checksum/fletcher32.go b/checksum/fletcher32.go
new file mode 100644
index 000000000..86c880fe7
--- /dev/null
+++ b/checksum/fletcher32.go
@@ -0,0 +1,22 @@
+// Package checksum provides functions for calculating various checksum values.
+package checksum
+
+import (
+    "fmt"
+)
+
+// Fletcher32 computes the Fletcher-32 checksum of the input data.
+func Fletcher32(data []byte) uint32 {
+    var sum1, sum2 uint32 = 0xff, 0xff
+    for _, byte := range data {
+        sum1 = (sum1 + uint32(byte)) % 0xff
+        sum2 = (sum2 + sum1) % 0xff
+    }
+    return (sum2 << 8) | sum1
+}
+
+// Fletcher32Hex computes the Fletcher-32 checksum of a string and returns it as a hexadecimal string.
+func Fletcher32Hex(input string) string {
+    fletcher := Fletcher32([]byte(input))
+    return fmt.Sprintf("%08X", fletcher)
+}