From 2b9ccbe76c6975fe7cd09a3260ba459d59b9970a Mon Sep 17 00:00:00 2001
From: Emiliano Ciavatta
Date: Wed, 1 Apr 2020 14:21:58 +0200
Subject: Initial commit

---
 utils.go | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 utils.go

(limited to 'utils.go')

diff --git a/utils.go b/utils.go
new file mode 100644
index 0000000..cc99d93
--- /dev/null
+++ b/utils.go
@@ -0,0 +1,30 @@
+package main
+
+import (
+	"crypto/sha256"
+	"io"
+	"log"
+	"os"
+)
+
+const invalidHashString = "invalid"
+
+func Sha256Sum(fileName string) (string, error) {
+	f, err := os.Open(fileName)
+	if err != nil {
+		return invalidHashString, err
+	}
+	defer func() {
+		err = f.Close()
+		if err != nil {
+			log.Println("Cannot close file " + fileName)
+		}
+	}()
+
+	h := sha256.New()
+	if _, err := io.Copy(h, f); err != nil {
+		return invalidHashString, err
+	}
+
+	return string(h.Sum(nil)), nil
+}
-- 
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