1/* Copyright 2015 OpenMarket Ltd
2 *
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15#include "olm/memory.hh"
16#include "olm/memory.h"
17
18void _olm_unset(
19 void volatile * buffer, size_t buffer_length
20) {
21 olm::unset(buffer, buffer_length);
22}
23
24void olm::unset(
25 void volatile * buffer, std::size_t buffer_length
26) {
27 char volatile * pos = reinterpret_cast<char volatile *>(buffer);
28 char volatile * end = pos + buffer_length;
29 while (pos != end) {
30 *(pos++) = 0;
31 }
32}
33
34
35bool olm::is_equal(
36 std::uint8_t const * buffer_a,
37 std::uint8_t const * buffer_b,
38 std::size_t length
39) {
40 std::uint8_t volatile result = 0;
41 while (length--) {
42 result |= (*(buffer_a++)) ^ (*(buffer_b++));
43 }
44 return result == 0;
45}
46