def decode_salt(salt: str) -> bytes:
"""Decodes the salt string to raw salt.
Args:
salt (str): The Base64-encoded string of the raw salt.
Returns:
The raw salt
"""
TypeCheck.ensure_str(salt, "salt")
return base64.b64decode(bytes(salt, "utf-8"))
def make_decrypter(salt: str, key: str) -> Cryptographer:
"""Makes a Fernet decrypter for salt and key.
Args:
salt (str): The Base64-encoded string of the raw salt.
key (str): The authentication key.
Returns:
A `Cryptographer` instance, which can be used to decrypt data.
"""
TypeCheck.ensure_str(salt, "salt")
TypeCheck.ensure_str(key, "key")
return Cryptographer(Cryptographer.decode_salt(salt), key.encode(),
False)
def test_ensure_str():
assert TypeCheck.ensure_str("") is None
assert TypeCheck.ensure_str(r"1asm") is None
with pytest.raises(TypeError):
TypeCheck.ensure_str(8)
with pytest.raises(TypeError):
TypeCheck.ensure_str(["string"])
