File integrity Checker

[sujakrishnasamy]

import hashlib
import os
import json

Function to calculate the hash of a file

def calculate_hash(file_path):
sha256_hash = hashlib.sha256()
try:
with open(file_path, "rb") as f:
for byte_block in iter(lambda: f.read(4096), b""):
sha256_hash.update(byte_block)
return sha256_hash.hexdigest()
except FileNotFoundError:
return None

Function to create or update the hash registry

def generate_hashes(directory, output_file="hashes.json"):
hash_data = {}
for root, dirs, files in os.walk(directory):
for file in files:
path = os.path.join(root, file)
hash_data[path] = calculate_hash(path)
with open(output_file, "w") as f:
json.dump(hash_data, f, indent=4)
print(f"Hashes stored in {output_file}")

Function to check file integrity

def check_integrity(directory, hash_file="hashes.json"):
if not os.path.exists(hash_file):
print("Hash file not found. Run generate_hashes() first.")
return

with open(hash_file, "r") as f:
    old_hashes = json.load(f)

for path, old_hash in old_hashes.items():
    new_hash = calculate_hash(path)
    if new_hash is None:
        print(f"[MISSING] {path}")
    elif new_hash != old_hash:
        print(f"[MODIFIED] {path}")
    else:
        print(f"[OK] {path}")

=== USAGE ===

Step 1: Generate hashes (run once initially)

generate_hashes("path_to_your_directory")

Step 2: Check file integrity later

check_integrity("path_to_your_directory")