Use the std::chrono to get the time.

[ Merge of http://go/wvgerrit/67985 ]

Now that we can use C++11, we should use the cross-platform types for
clocks instead of the platform-specific versions.

Test: WV unit/integration tests.
Change-Id: I50318e3d1caf9e814f33f497f83c19c9f3c154a1

libwvdrmengine/oemcrypto/ref/src/oemcrypto_engine_ref.cpp

@@ -8,6 +8,7 @@
 
 #include <arpa/inet.h>
 #include <assert.h>
+#include <chrono>
 #include <string.h>
 #include <algorithm>
 #include <iostream>
@@ -90,14 +91,8 @@ SessionContext* CryptoEngine::FindSession(SessionId sid) {
 time_t CryptoEngine::OnlineTime() {
   // Use the monotonic clock for times that don't have to be stable across
   // device boots.
-  timespec current_time;
-  int gettime_result = clock_gettime(CLOCK_MONOTONIC, &current_time);
-  if (gettime_result == 0) {
-    return current_time.tv_sec;
-  } else {
-    // Can't use monotonic clock, use roll back time.
-    return RollbackCorrectedOfflineTime();
-  }
+  std::chrono::steady_clock clock;
+  return clock.now().time_since_epoch() / std::chrono::seconds(1);
 }
 
 time_t CryptoEngine::RollbackCorrectedOfflineTime() {

libwvdrmengine/oemcrypto/ref/src/oemcrypto_ref.cpp

@@ -15,8 +15,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <string.h>
-#include <sys/time.h>
-#include <time.h>
+#include <chrono>
 #include <iostream>
 #include <string>
 #include <utility>
@@ -162,12 +161,6 @@ OEMCRYPTO_API OEMCryptoResult OEMCrypto_GenerateDerivedKeys(
   return OEMCrypto_SUCCESS;
 }
 
-static const uint64_t one_second = 1000000ull;
-static uint64_t TimeStamp(void) {
-  struct timeval tv;
-  gettimeofday(&tv,NULL);
-  return tv.tv_sec * one_second + tv.tv_usec;
-}
 
 OEMCRYPTO_API OEMCryptoResult OEMCrypto_GenerateNonce(OEMCrypto_SESSION session,
                                                       uint32_t* nonce) {
@@ -182,13 +175,14 @@ OEMCRYPTO_API OEMCryptoResult OEMCrypto_GenerateNonce(OEMCrypto_SESSION session,
   }
 
   // Prevent nonce flood.
-  uint64_t now = TimeStamp();
-  static uint64_t last_nonce_time = now;
+  static std::chrono::steady_clock clock;
+  const auto now = clock.now().time_since_epoch();
+  static auto last_nonce_time = now;
   // For testing, we set nonce_flood_count to 1.  Since count is initialized to
   // 1, the very first nonce after initialization is counted as a flood.
   static int nonce_count = 1;
 
-  if (now - last_nonce_time < one_second) {
+  if (now - last_nonce_time < std::chrono::seconds(1)) {
     nonce_count++;
     if (nonce_count > crypto_engine->nonce_flood_count()) {
       LOGE("[OEMCrypto_GenerateNonce(): Nonce Flood detected]");

libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp

@@ -16,11 +16,11 @@
 #include <openssl/x509.h>
 #include <stdint.h>
 #include <sys/time.h>
-#include <sys/types.h>
 #include <time.h>
 
 #include <gtest/gtest.h>
 #include <algorithm>
+#include <chrono>
 #include <iostream>
 #include <map>
 #include <string>
@@ -2818,32 +2818,25 @@ class OEMCryptoUsesCertificate : public OEMCryptoLoadsCertificate {
 // This test is not run by default, because it takes a long time and
 // is used to measure RSA performance, not test functionality.
 TEST_F(OEMCryptoLoadsCertificate, RSAPerformance) {
+  const std::chrono::milliseconds kTestDuration(5000);
   OEMCryptoResult sts;
+  std::chrono::steady_clock clock;
   sleep(2);  // Make sure are not nonce limited.
 
-  const uint32_t TestDuration = 5000;  // milliseconds.
-  struct timeval start_time, end_time;
-  gettimeofday(&start_time, NULL);
-  gettimeofday(&end_time, NULL);
-  double mtime = 0;
-  long count = 0;
-  for (int i = 0; i < 15; i++) {  // Only 20 nonce available.
+  auto start_time = clock.now();
+  int count = 15;
+  for (int i = 0; i < count; i++) {  // Only 20 nonce available.
     CreateWrappedRSAKey(kSign_RSASSA_PSS, true);
-    count++;
-    gettimeofday(&end_time, NULL);
-    long seconds = end_time.tv_sec - start_time.tv_sec;
-    long useconds = end_time.tv_usec - start_time.tv_usec;
-    mtime = seconds * 1e3 + useconds * 1e-3;
   }
-  double provision_time = mtime / count;
+  auto delta_time = clock.now() - start_time;
+  const double provision_time =
+      delta_time / std::chrono::milliseconds(1) / count;
 
   Session session;
   CreateWrappedRSAKey(kSign_RSASSA_PSS, true);
-  gettimeofday(&start_time, NULL);
-  gettimeofday(&end_time, NULL);
-  mtime = 0;
+  start_time = clock.now();
   count = 0;
-  do {
+  while (clock.now() - start_time < kTestDuration) {
     Session s;
     ASSERT_NO_FATAL_FAILURE(s.open());
     sts = OEMCrypto_LoadDeviceRSAKey(s.session_id(), wrapped_rsa_key_.data(),
@@ -2865,12 +2858,10 @@ TEST_F(OEMCryptoLoadsCertificate, RSAPerformance) {
     delete[] signature;
     ASSERT_EQ(OEMCrypto_SUCCESS, sts);
     count++;
-    gettimeofday(&end_time, NULL);
-    long seconds = end_time.tv_sec - start_time.tv_sec;
-    long useconds = end_time.tv_usec - start_time.tv_usec;
-    mtime = seconds * 1e3 + useconds * 1e-3;
-  } while (mtime < TestDuration);
-  double license_request_time = mtime / count;
+  }
+  delta_time = clock.now() - start_time;
+  const double license_request_time =
+      delta_time / std::chrono::milliseconds(1) / count;
 
   Session s;
   ASSERT_NO_FATAL_FAILURE(s.open());
@@ -2885,10 +2876,6 @@ TEST_F(OEMCryptoLoadsCertificate, RSAPerformance) {
   vector<uint8_t> mac_context;
   vector<uint8_t> enc_context;
   s.FillDefaultContext(&mac_context, &enc_context);
-  gettimeofday(&start_time, NULL);
-  gettimeofday(&end_time, NULL);
-  mtime = 0;
-  count = 0;
 
   enc_session_key = wvcdm::a2b_hex(
       "7789c619aa3b9fa3c0a53f57a4abc6"
@@ -2908,7 +2895,8 @@ TEST_F(OEMCryptoLoadsCertificate, RSAPerformance) {
       "ad2b1254f80c0c5dd3cf111b56572217"
       "b9f58fc1dacbf74b59d354a1e62cfa0e"
       "bf");
-  do {
+  start_time = clock.now();
+  while (clock.now() - start_time < kTestDuration) {
     ASSERT_EQ(OEMCrypto_SUCCESS,
               OEMCrypto_DeriveKeysFromSessionKey(
                   s.session_id(),
@@ -2916,12 +2904,10 @@ TEST_F(OEMCryptoLoadsCertificate, RSAPerformance) {
                   mac_context.data(), mac_context.size(),
                   enc_context.data(), enc_context.size()));
     count++;
-    gettimeofday(&end_time, NULL);
-    long seconds = end_time.tv_sec - start_time.tv_sec;
-    long useconds = end_time.tv_usec - start_time.tv_usec;
-    mtime = seconds * 1e3 + useconds * 1e-3;
-  } while (mtime < TestDuration);
-  double derive_keys_time = mtime / count;
+  }
+  delta_time = clock.now() - start_time;
+  const double derive_keys_time =
+      delta_time / std::chrono::milliseconds(1) / count;
 
   const char* level = OEMCrypto_SecurityLevel();
   printf("PERF:head, security, provision (ms), lic req(ms), derive keys(ms)\n");