votes up 1

PBKDF2 instances can only be used once.

Exception Class:

Raise code

        utils._check_bytes("salt", salt)
        self._salt = salt
        self._iterations = iterations
        self._backend = backend

    def derive(self, key_material: bytes) -> bytes:
        if self._used:
            raise AlreadyFinalized("PBKDF2 instances can only be used once.")
        self._used = True

        utils._check_byteslike("key_material", key_material)
        return self._backend.derive_pbkdf2_hmac(
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