$ python file_encrypt.py --file path/to/file.txt --algorithm AES --key mysecretpassword

file_encrypt.py.txt

+import argparse
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
+from cryptography.hazmat.primitives import serialization
+from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
+import os
+
+def encrypt_file(file_path, algorithm, key):
+    with open(file_path, 'rb') as file:
+        plaintext = file.read()
+
+    salt = os.urandom(16)
+    kdf = PBKDF2HMAC(
+        algorithm=hashes.SHA256(),
+        length=32,
+        salt=salt,
+        iterations=100000,
+        backend=default_backend()
+    )
+    key = kdf.derive(key.encode())
+
+    cipher = Cipher(algorithm(key), modes.CFB8(os.urandom(16)), backend=default_backend())
+    encryptor = cipher.encryptor()
+    ciphertext = encryptor.update(plaintext) + encryptor.finalize()
+
+    encrypted_file_path = file_path + '.enc'
+    with open(encrypted_file_path, 'wb') as encrypted_file:
+        encrypted_file.write(salt + ciphertext)
+
+    print(f'File encrypted successfully as {encrypted_file_path}')
+
+if _name_ == '_main_':
+    parser = argparse.ArgumentParser(description='File Encryption Tool')
+    parser.add_argument('--file', required=True, help='Path to the file to be encrypted')
+    parser.add_argument('--algorithm', required=True, choices=['AES', 'DES', '3DES'], help='Encryption algorithm (AES, DES, or 3DES)')
+    parser.add_argument('--key', required=True, help='Secret key for encryption')
+    args = parser.parse_args()
+
+    algorithms_map = {
+        'AES': algorithms.AES,
+        'DES': algorithms.DES,
+        '3DES': algorithms.TripleDES
+    }
+
+    if args.algorithm not in algorithms_map:
+        print('Invalid algorithm')
+        exit(1)
+
+    if not os.path.exists(args.file):
+        print('File does not exist')
+        exit(1)
+
+    encrypt_file(args.file, algorithms_map[args.algorithm], args.key)
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