1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #pragma once
18
19 #include <algorithm>
20 #include <array>
21 #include <cstdint>
22
23 namespace rootcanal::crypto {
24
25 constexpr int kOctet16Length = 16;
26 using Octet16 = std::array<uint8_t, kOctet16Length>;
27
28 Octet16 aes_128(const Octet16& key, const Octet16& message);
29
30 /* This function computes AES_128(key, message). |key| must be 128bit.
31 * |message| can be at most 16 bytes long, its length in bytes is given in
32 * |length| */
aes_128(const Octet16 & key,const uint8_t * message,const uint8_t length)33 inline Octet16 aes_128(const Octet16& key, const uint8_t* message,
34 const uint8_t length) {
35 Octet16 padded_message{0};
36 std::copy(message, message + length, padded_message.begin());
37 return aes_128(key, padded_message);
38 }
39
40 } // namespace rootcanal::crypto
41