lapp/test.py

import pickle
from pathlib import Path

from cryptography.fernet import Fernet
from secrets_config import load_secrets

# =====================================================
# SECRET KEY (only your program has this)
# =====================================================
# The key is generated once and stored outside Git in instance/secrets.yaml.
_SECRET_KEY = load_secrets(Path(__file__).parent / "instance")["fernet"]["key"].encode("ascii")

fernet = Fernet(_SECRET_KEY)

# =====================================================
# ENCRYPT
# =====================================================
def encrypt_object(obj) -> bytes:
    """
    Encrypt any Python object and return encrypted bytes.
    """
    serialized = pickle.dumps(obj)
    encrypted = fernet.encrypt(serialized)
    return encrypted

# =====================================================
# DECRYPT
# =====================================================
def decrypt_object(encrypted_data: bytes):
    """
    Decrypt bytes back into the original Python object.
    """
    decrypted = fernet.decrypt(encrypted_data)
    obj = pickle.loads(decrypted)
    return obj

# =====================================================
# EXAMPLE USAGE
# =====================================================
if __name__ == "__main__":
    original_object = {
        "user": "alice",
        "permissions": ["read", "write"],
        "balance": 123.45
    }

    encrypted = encrypt_object(original_object)
    print("Encrypted:", str(encrypted))

    decrypted = decrypt_object(encrypted)
    print("Decrypted:", decrypted)


bytes_data = b'I am a bytes string'

string_data = bytes_data.decode('utf-8')

print("Type Before :- ",type(bytes_data))

print(string_data)

print("Type After :- ",type(string_data))