From 2a8202e74846d191a321cca1202175af9db6107d Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Thu, 5 Nov 2020 01:45:06 +0100
Subject: Convert to sibs project

---
 python/olm/utility.py | 151 --------------------------------------------------
 1 file changed, 151 deletions(-)
 delete mode 100644 python/olm/utility.py

(limited to 'python/olm/utility.py')

diff --git a/python/olm/utility.py b/python/olm/utility.py
deleted file mode 100644
index bddef38..0000000
--- a/python/olm/utility.py
+++ /dev/null
@@ -1,151 +0,0 @@
-# -*- coding: utf-8 -*-
-# libolm python bindings
-# Copyright © 2015-2017 OpenMarket Ltd
-# Copyright © 2018 Damir Jelić <poljar@termina.org.uk>
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-"""libolm Utility module.
-
-This module contains utilities for olm.
-It only contains the ed25519_verify function for signature verification.
-
-Examples:
-    >>> alice = Account()
-
-    >>> message = "Test"
-    >>> signature = alice.sign(message)
-    >>> signing_key = alice.identity_keys["ed25519"]
-
-    >>> ed25519_verify(signing_key, message, signature)
-
-"""
-
-# pylint: disable=redefined-builtin,unused-import
-from typing import AnyStr, Type
-
-from future.utils import bytes_to_native_str
-
-# pylint: disable=no-name-in-module
-from _libolm import ffi, lib  # type: ignore
-
-from ._compat import to_bytearray, to_bytes
-from ._finalize import track_for_finalization
-
-
-def _clear_utility(utility):  # pragma: no cover
-    # type: (ffi.cdata) -> None
-    lib.olm_clear_utility(utility)
-
-
-class OlmVerifyError(Exception):
-    """libolm signature verification exception."""
-
-
-class OlmHashError(Exception):
-    """libolm hash calculation exception."""
-
-
-class _Utility(object):
-    # pylint: disable=too-few-public-methods
-    """libolm Utility class."""
-
-    _buf = None
-    _utility = None
-
-    @classmethod
-    def _allocate(cls):
-        # type: (Type[_Utility]) -> None
-        cls._buf = ffi.new("char[]", lib.olm_utility_size())
-        cls._utility = lib.olm_utility(cls._buf)
-        track_for_finalization(cls, cls._utility, _clear_utility)
-
-    @classmethod
-    def _check_error(cls, ret, error_class):
-        # type: (int, Type) -> None
-        if ret != lib.olm_error():
-            return
-
-        raise error_class("{}".format(
-            ffi.string(lib.olm_utility_last_error(
-                cls._utility)).decode("utf-8")))
-
-    @classmethod
-    def _ed25519_verify(cls, key, message, signature):
-        # type: (Type[_Utility], AnyStr, AnyStr, AnyStr) -> None
-        if not cls._utility:
-            cls._allocate()
-
-        byte_key = to_bytes(key)
-        byte_message = to_bytearray(message)
-        byte_signature = to_bytearray(signature)
-
-        try:
-            ret = lib.olm_ed25519_verify(
-                cls._utility,
-                byte_key,
-                len(byte_key),
-                ffi.from_buffer(byte_message),
-                len(byte_message),
-                ffi.from_buffer(byte_signature),
-                len(byte_signature)
-            )
-
-            cls._check_error(ret, OlmVerifyError)
-
-        finally:
-            # clear out copies of the message, which may be a plaintext
-            if byte_message is not message:
-                for i in range(0, len(byte_message)):
-                    byte_message[i] = 0
-
-    @classmethod
-    def _sha256(cls, input):
-        # type: (Type[_Utility], AnyStr) -> str
-        if not cls._utility:
-            cls._allocate()
-
-        byte_input = to_bytes(input)
-        hash_length = lib.olm_sha256_length(cls._utility)
-        hash = ffi.new("char[]", hash_length)
-
-        ret = lib.olm_sha256(cls._utility, byte_input, len(byte_input),
-                             hash, hash_length)
-
-        cls._check_error(ret, OlmHashError)
-
-        return bytes_to_native_str(ffi.unpack(hash, hash_length))
-
-
-def ed25519_verify(key, message, signature):
-    # type: (AnyStr, AnyStr, AnyStr) -> None
-    """Verify an ed25519 signature.
-
-    Raises an OlmVerifyError if verification fails.
-
-    Args:
-        key(str): The ed25519 public key used for signing.
-        message(str): The signed message.
-        signature(bytes): The message signature.
-    """
-    return _Utility._ed25519_verify(key, message, signature)
-
-
-def sha256(input_string):
-    # type: (AnyStr) -> str
-    """Calculate the SHA-256 hash of the input and encodes it as base64.
-
-    Args:
-        input_string(str): The input for which the hash will be calculated.
-
-    """
-    return _Utility._sha256(input_string)
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