create file into db

backend/internal/service/checksum.go

@@ -0,0 +1,22 @@
+package service
+
+import (
+	"crypto/sha256"
+	"crypto/subtle"
+)
+
+func CreateSHA256Hash(data []byte) []byte {
+	hasher := sha256.New()
+
+	hasher.Write(data)
+
+	return hasher.Sum(nil)
+}
+
+func CompareHash(x, y []byte) bool {
+	if len(x) != len(y) {
+		return false
+	}
+
+	return subtle.ConstantTimeCompare(x, y) == 1
+}