Fix secret key validation and encoding in generate_secret_key function; update requirements and add setup script

ft_otp.py

@@ -49,14 +49,14 @@ def generate_secret_key(secret_file):
 	if not secret:
 		print("The provided secret file is empty. Please provide a valid secret.")
 		return
-	if not is_hex(secret.decode()):
+	if not is_hex(secret):
 		print("The provided secret is not a valid hexadecimal string.")
 		return
 	if len(secret) < 64:
 		print("The provided secret is too short. It should be at least 64 characters long.")
 		return
 	fernet = Fernet(machine_id)
-	secret_enc = fernet.encrypt(secret)
+	secret_enc = fernet.encrypt(secret.encode())
 	try:
 		with open('./ft_otp.key', 'wb') as f:
 			f.write(secret_enc)

requirements.txt

@@ -1,3 +1,6 @@
 cffi==1.17.1
 cryptography==45.0.4
+pillow==11.3.0
 pycparser==2.22
+qrcode==8.2
+qrcode-terminal==0.8

setup.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+python3 -m venv .venv
+source .venv/bin/activate
+pip install -r requirements.txt