Un chiffrement qui ne retient rien.

SALT_LENGTH = 32                # Zoutgrootte in bytes. Aanbevolen: 32 (256 bits)
NONCE_LENGTH = 12               # GCM nonce grootte. Aanbevolen: 12 (96 bits, standaard)
TIME_COST = 4                   # Argon2 iteraties. Aanbevolen: 3-5 (hoger = langzamer)
MEMORY_COST = 131072            # Argon2 geheugen in KB. Aanbevolen: 65536-262144 (64-256 MB)
PARALLELISM = 4                 # Argon2 threads. Aanbevolen: 2-4 (gebaseerd op CPU cores)
KEY_LENGTH = 32                 # AES sleutelgrootte. Vereist: 32 (256 bits voor AES-256)

def generate_key(answers, salt):
    """
    Why no pre-hashing?
    - Passing answers directly preserves full entropy
    - SHA-256 pre-hashing would limit entropy to 256 bits regardless of input
    - Argon2 handles any input size efficiently
    """
    normalized_answers = [normalize_answer(a) for a in answers]

    # Combine answers with a separator that's unlikely to appear in answers
    # This preserves the full entropy of each answer
    separator = b'\x00\x1f\x00'  # Null + Unit Separator + Null
    combined = separator.join(a.encode('utf-8') for a in normalized_answers)

    key = hash_secret_raw(
        combined,
        salt,
        time_cost=TIME_COST,
        memory_cost=MEMORY_COST,
        parallelism=PARALLELISM,
        hash_len=KEY_LENGTH,
        type=Type.ID  # Argon2id
    )

    return key

# Tkinter is optioneel - voor bestandsselectie dialoog
# Tails heeft standaard GEEN tkinter, dus we maken het optioneel
TKINTER_AVAILABLE = False
try:
    import tkinter as tk
    from tkinter import filedialog
    TKINTER_AVAILABLE = True
except ImportError:
    pass  # Tkinter niet beschikbaar - bestandsselectie wordt handmatig

# Probeer Crypto eerst, dan Cryptodome (Tails kan beide hebben)
try:
    from Crypto.Cipher import AES
    from Crypto.Random import get_random_bytes
    from Crypto.Hash import HMAC, SHA256
except ImportError:
    from Cryptodome.Cipher import AES
    from Cryptodome.Random import get_random_bytes
    from Cryptodome.Hash import HMAC, SHA256

pip_commands = [
    ['pip3', 'install', '--user', '--break-system-packages'],
    ['torsocks', 'pip3', 'install', '--user', '--break-system-packages'],
    ['python3', '-m', 'pip', 'install', '--user', '--break-system-packages'],
]

for pip_name, apt_name in missing:
    installed = False
    for pip_cmd in pip_commands:
        try:
            cmd = pip_cmd + [pip_name]
            result = subprocess.run(cmd, capture_output=True, text=True, timeout=180)
            if result.returncode == 0:
                installed = True
                break
        except Exception:
            continue