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 24 namespace android { 25 namespace hardware { 26 namespace confirmationui { 27 namespace V1_0 { 28 namespace implementation { 29 30 MonotonicClockTimeStamper::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 39 support::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
