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MClogger/web/crypto.py
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"""
MCLogger Kryptographie-Utilities
- Passwort-Hashing: PBKDF2-HMAC-SHA256 mit Salt (pro Nutzer) + Pepper (global, via ENV)
- DB-Credential-Verschlüsselung: Fernet (symmetrisch, Schlüssel via ENV)
"""
import hashlib
import os
from cryptography.fernet import Fernet
from config import Config
# ─────────────────────────────────────────────────────────────
# Passwort-Hashing
# ─────────────────────────────────────────────────────────────
def generate_salt() -> str:
"""Generiert einen zufälligen 32-Byte Hex-Salt."""
return os.urandom(32).hex()
def hash_password(password: str, salt: str) -> str:
"""
Hasht ein Passwort mit PBKDF2-HMAC-SHA256.
Verwendet: salt (pro Nutzer) + pepper (global aus ENV)
"""
dk = hashlib.pbkdf2_hmac(
"sha256",
password.encode("utf-8"),
(salt + Config.PASSWORD_PEPPER).encode("utf-8"),
iterations=260_000,
)
return dk.hex()
def verify_password(password: str, salt: str, stored_hash: str) -> bool:
"""Prüft ob ein Passwort korrekt ist."""
return hash_password(password, salt) == stored_hash
# ─────────────────────────────────────────────────────────────
# Fernet-Verschlüsselung (für DB-Zugangsdaten)
# ─────────────────────────────────────────────────────────────
def _get_fernet() -> Fernet:
key = Config.FERNET_KEY
if not key:
raise RuntimeError(
"FERNET_KEY ist nicht gesetzt! "
"Generieren: python -c \"from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())\""
)
if isinstance(key, str):
key = key.encode()
return Fernet(key)
def encrypt_str(plaintext: str) -> str:
"""Verschlüsselt einen String mit Fernet."""
return _get_fernet().encrypt(plaintext.encode("utf-8")).decode("utf-8")
def decrypt_str(ciphertext: str) -> str:
"""Entschlüsselt einen Fernet-verschlüsselten String."""
return _get_fernet().decrypt(ciphertext.encode("utf-8")).decode("utf-8")