1/*
2**
3** Copyright 2017, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#include "PlatformSpecifics.h"
19
20#include <openssl/hmac.h>
21#include <openssl/sha.h>
22#include <time.h>
23
24namespace android {
25namespace hardware {
26namespace confirmationui {
27namespace V1_0 {
28namespace implementation {
29
30MonotonicClockTimeStamper::TimeStamp MonotonicClockTimeStamper::now() {
31    timespec ts;
32    if (!clock_gettime(CLOCK_BOOTTIME, &ts)) {
33        return TimeStamp(ts.tv_sec * UINT64_C(1000) + ts.tv_nsec / UINT64_C(1000000));
34    } else {
35        return {};
36    }
37}
38
39support::NullOr<support::hmac_t> HMacImplementation::hmac256(
40    const support::auth_token_key_t& key, std::initializer_list<support::ByteBufferProxy> buffers) {
41    HMAC_CTX hmacCtx;
42    HMAC_CTX_init(&hmacCtx);
43    if (!HMAC_Init_ex(&hmacCtx, key.data(), key.size(), EVP_sha256(), nullptr)) {
44        return {};
45    }
46    for (auto& buffer : buffers) {
47        if (!HMAC_Update(&hmacCtx, buffer.data(), buffer.size())) {
48            return {};
49        }
50    }
51    support::hmac_t result;
52    if (!HMAC_Final(&hmacCtx, result.data(), nullptr)) {
53        return {};
54    }
55    return result;
56}
57
58}  // namespace implementation
59}  // namespace V1_0
60}  // namespace confirmationui
61}  // namespace hardware
62}  // namespace android
63