add zip and parity stuff

fileUtilities/hash.go

@@ -0,0 +1,23 @@
+package fileUtilities
+
+import (
+	"crypto/sha256"
+	"fmt"
+	"io"
+	"os"
+)
+
+func HashFile(filePath string) ([]byte, error) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return []byte{}, fmt.Errorf("error opening file for hashing: %w", err)
+	}
+	defer file.Close()
+
+	h := sha256.New()
+	if _, err := io.Copy(h, file); err != nil {
+		return []byte{}, fmt.Errorf("error hashing file: %w", err)
+	}
+
+	return h.Sum(nil), nil
+}