Hashing a Directory with MD5 and SHA256 and outputs them in to a CSV, aim is to provide a snapshot of a directory at a moment in time.

hash.py

import hashlib
import csv
import os 
import datetime 

def calcualte_hash(file_path):
    hash_md5 = hashlib.md5()
    hash_SHA256 = hashlib.sha256()
    try:
        with open(file_path, "rb") as f:
            while chunk := f.read(8192):
                hash_md5.update(chunk)
                hash_SHA256.update(chunk)
    except PermissionError:
        print(f"Error on {file_path}")
        return "ERROR", "ERROR"
    return hash_md5.hexdigest(), hash_SHA256.hexdigest()

def hash_dir(file_path):
    output_csv_filename = f"{datetime.datetime.now(datetime.timezone.utc).strftime("%d-%m-%yT%H-%M-%S")}Z hash-check.csv"
    with open(output_csv_filename, mode="w", newline="", encoding="utf-8") as csv_file:
        fieldnames = ["Time of Hash", "MD5", "SHA256", "File Name", "Path of File"]
        writer = csv.DictWriter(csv_file, fieldnames=fieldnames)

        if csv_file.tell() == 0:
            writer.writeheader()
        
        for root, _, files in os.walk(file_path):
            for file_name in files:
                file_path = os.path.join(root, file_name)

                if os.path.isfile(file_path):
                    md5, sha256 = calcualte_hash(file_path=file_path)
                    writer.writerow({"Time of Hash": datetime.datetime.now(datetime.timezone.utc).isoformat(), "MD5": md5, "SHA256": sha256, "File Name":file_name, "Path of File": file_path})
        csv_file.close()


extract = ""
hash_dir(extract)