Completed the functionalities of SrtpTransport.

webrtc/pc/srtptransport_unittest.cc

 /*
  *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/pc/srtptransport.h"
 
+#include "webrtc/media/base/fakertp.h"
+#include "webrtc/p2p/base/dtlstransportinternal.h"
+#include "webrtc/p2p/base/fakepackettransport.h"
 #include "webrtc/pc/rtptransport.h"
 #include "webrtc/pc/rtptransporttestutil.h"
+#include "webrtc/pc/srtptestutil.h"
 #include "webrtc/rtc_base/asyncpacketsocket.h"
 #include "webrtc/rtc_base/gunit.h"
 #include "webrtc/rtc_base/ptr_util.h"
-#include "webrtc/test/gmock.h"
+#include "webrtc/rtc_base/sslstreamadapter.h"
+
+using rtc::kTestKey1;
+using rtc::kTestKey2;
+using rtc::kTestKeyLen;
+using rtc::SRTP_AEAD_AES_128_GCM;
 
 namespace webrtc {
-
-using testing::_;
-using testing::Return;
-
-class MockRtpTransport : public RtpTransport {
+static const uint8_t kTestKeyGcm128_1[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ12";
+static const uint8_t kTestKeyGcm128_2[] = "21ZYXWVUTSRQPONMLKJIHGFEDCBA";
+static const int kTestKeyGcm128Len = 28;  // 128 bits key + 96 bits salt.
+static const uint8_t kTestKeyGcm256_1[] =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqr";
+static const uint8_t kTestKeyGcm256_2[] =
+    "rqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA";
+static const int kTestKeyGcm256Len = 44;  // 256 bits key + 96 bits salt.
+
+class FakeRtpTransport : public RtpTransport {
  public:
-  MockRtpTransport() : RtpTransport(true) {}
-
-  MOCK_METHOD4(SendPacket,
-               bool(bool rtcp,
-                    rtc::CopyOnWriteBuffer* packet,
-                    const rtc::PacketOptions& options,
-                    int flags));
-
-  void PretendReceivedPacket() {
+  FakeRtpTransport() : RtpTransport(true) {
+    rtp_packet_transport_ =
+        rtc::MakeUnique<rtc::FakePacketTransport>("FakePacketTransport");
+    SetRtpPacketTransport(rtp_packet_transport_.get());
+  }
+
+  void Connect(FakeRtpTransport* peer) {
+    peer_ = peer;
+    if (peer_) {
+      rtp_packet_transport_->SetDestination(
+          static_cast<rtc::FakePacketTransport*>(peer_->rtp_packet_transport()),
+          false);
+    }
+  }
+
+  bool SendPacket(bool rtcp,
+                  rtc::CopyOnWriteBuffer* packet,
+                  const rtc::PacketOptions& options,
+                  int flags) override {
+    if (peer_) {
+      rtp_packet_transport_->SendPacket(
+          reinterpret_cast<const char*>(packet->data()), packet->size(),
+          options, flags);
+      peer_->SignalPacketReceived(rtcp, packet, rtc::PacketTime());
+    }
+    return true;
+  }
+
+ private:
+  FakeRtpTransport* peer_ = nullptr;
+  std::unique_ptr<rtc::FakePacketTransport> rtp_packet_transport_;
+};
+
+class SrtpTransportTest : public testing::Test, public sigslot::has_slots<> {
+ protected:
+  SrtpTransportTest() {
+    auto rtp_transport1 = rtc::MakeUnique<FakeRtpTransport>();
+    auto rtp_transport2 = rtc::MakeUnique<FakeRtpTransport>();
+    rtp_transport1->Connect(rtp_transport2.get());
+    rtp_transport2->Connect(rtp_transport1.get());
+
+    srtp_transport1_ =
+        rtc::MakeUnique<SrtpTransport>(std::move(rtp_transport1), "content");
+    srtp_transport2_ =
+        rtc::MakeUnique<SrtpTransport>(std::move(rtp_transport2), "content");
+
+    srtp_transport1_->SignalPacketReceived.connect(
+        this, &SrtpTransportTest::OnPacketReceived1);
+    srtp_transport2_->SignalPacketReceived.connect(
+        this, &SrtpTransportTest::OnPacketReceived2);
+  }
+
+  void OnPacketReceived1(bool rtcp,
+                         rtc::CopyOnWriteBuffer* packet,
+                         const rtc::PacketTime& packet_time) {
+    LOG(LS_INFO) << "SrtpTransport1 Received a packet.";
+    last_recv_packet1_ = *packet;
+  }
+
+  void OnPacketReceived2(bool rtcp,
+                         rtc::CopyOnWriteBuffer* packet,
+                         const rtc::PacketTime& packet_time) {
+    LOG(LS_INFO) << "SrtpTransport2 Received a packet.";
+    last_recv_packet2_ = *packet;
+  }
+
+  // With external auth enabled, SRTP doesn't write the auth tag and
+  // unprotect would fail. Check accessing the information about the
+  // tag instead, similar to what the actual code would do that relies
+  // on external auth.
+  void TestRtpAuthParams(SrtpTransport* transport, const std::string& cs) {
+    int overhead;
+    EXPECT_TRUE(transport->GetSrtpOverhead(&overhead));
+    switch (rtc::SrtpCryptoSuiteFromName(cs)) {
+      case rtc::SRTP_AES128_CM_SHA1_32:
+        EXPECT_EQ(32 / 8, overhead);  // 32-bit tag.
+        break;
+      case rtc::SRTP_AES128_CM_SHA1_80:
+        EXPECT_EQ(80 / 8, overhead);  // 80-bit tag.
+        break;
+      default:
+        RTC_NOTREACHED();
+        break;
+    }
+
+    uint8_t* auth_key = nullptr;
+    int key_len = 0;
+    int tag_len = 0;
+    EXPECT_TRUE(transport->GetRtpAuthParams(&auth_key, &key_len, &tag_len));
+    EXPECT_NE(nullptr, auth_key);
+    EXPECT_EQ(160 / 8, key_len);  // Length of SHA-1 is 160 bits.
+    EXPECT_EQ(overhead, tag_len);
+  }
+
+  void TestSendRecvRtpPacket(const std::string& cipher_suite_name) {
     bool rtcp = false;
-    rtc::CopyOnWriteBuffer buffer;
-    rtc::PacketTime time;
-    SignalPacketReceived(rtcp, &buffer, time);
-  }
+
+    int rtp_len = sizeof(kPcmuFrame);
+    int packet_size = rtp_len + rtc::rtp_auth_tag_len(cipher_suite_name);
+    char rtp_packet_data[packet_size];
+    memcpy(rtp_packet_data, kPcmuFrame, rtp_len);
+    // In order to be able to run this test function multiple times we can not
+    // use the same sequence number twice. Increase the sequence number by one.
+    rtc::SetBE16(reinterpret_cast<uint8_t*>(rtp_packet_data) + 2,
+                 ++sequence_number_);
+    rtc::CopyOnWriteBuffer rtp_packet1to2(rtp_packet_data, rtp_len,
+                                          packet_size);
+    rtc::CopyOnWriteBuffer rtp_packet2to1(rtp_packet_data, rtp_len,
+                                          packet_size);
+
+    char original_rtp_data[rtp_len];
+    memcpy(original_rtp_data, rtp_packet_data, rtp_len);
+
+    rtc::PacketOptions options;
+    int flags = cricket::PF_NORMAL;
+    // Send a packet from |srtp_transport1_| to |srtp_transport2_| and verify
+    // that the packet can be successfully received and decrypted.
+    ASSERT_TRUE(
+        srtp_transport1_->SendPacket(rtcp, &rtp_packet1to2, options, flags));
+    if (srtp_transport1_->IsExternalAuthActive()) {
+      TestRtpAuthParams(srtp_transport1_.get(), cipher_suite_name);
+    } else {
+      ASSERT_TRUE(last_recv_packet2_.data());
+      EXPECT_TRUE(
+          memcmp(last_recv_packet2_.data(), original_rtp_data, rtp_len) == 0);
+      // Get the encrypted packet from underneath packet transport and verify
+      // the data is actually encrypted.
+      auto fake_rtp_packet_transport = static_cast<rtc::FakePacketTransport*>(
+          srtp_transport1_->rtp_packet_transport());
+      EXPECT_FALSE(memcmp(fake_rtp_packet_transport->last_sent_packet()->data(),
+                          original_rtp_data, rtp_len) == 0);
+    }
+
+    // Do the same thing in the opposite direction;
+    ASSERT_TRUE(
+        srtp_transport2_->SendPacket(rtcp, &rtp_packet2to1, options, flags));
+    if (srtp_transport2_->IsExternalAuthActive()) {
+      TestRtpAuthParams(srtp_transport2_.get(), cipher_suite_name);
+    } else {
+      ASSERT_TRUE(last_recv_packet1_.data());
+      EXPECT_TRUE(
+          memcmp(last_recv_packet1_.data(), original_rtp_data, rtp_len) == 0);
+      auto fake_rtp_packet_transport = static_cast<rtc::FakePacketTransport*>(
+          srtp_transport2_->rtp_packet_transport());
+      EXPECT_FALSE(memcmp(fake_rtp_packet_transport->last_sent_packet()->data(),
+                          original_rtp_data, rtp_len) == 0);
+    }
+  }
+
+  void TestSendRecvRtcpPacket(const std::string& cipher_suite_name) {
+    bool rtcp = true;
+
+    int rtcp_len = sizeof(kRtcpReport);
+    int packet_size = rtcp_len + 4 + rtc::rtcp_auth_tag_len(cipher_suite_name);
+    char rtcp_packet_data[packet_size];
+    memcpy(rtcp_packet_data, kRtcpReport, rtcp_len);
+
+    rtc::CopyOnWriteBuffer rtcp_packet1to2(rtcp_packet_data, rtcp_len,
+                                           packet_size);
+    rtc::CopyOnWriteBuffer rtcp_packet2to1(rtcp_packet_data, rtcp_len,
+                                           packet_size);
+
+    rtc::PacketOptions options;
+    int flags = cricket::PF_NORMAL;
+    // Send a packet from |srtp_transport1_| to |srtp_transport2_| and verify
+    // that the packet can be successfully received and decrypted.
+    ASSERT_TRUE(
+        srtp_transport1_->SendPacket(rtcp, &rtcp_packet1to2, options, flags));
+    ASSERT_TRUE(last_recv_packet2_.data());
+    EXPECT_TRUE(memcmp(last_recv_packet2_.data(), rtcp_packet_data, rtcp_len) ==
+                0);
+    // Get the encrypted packet from underneath packet transport and verify the
+    // data is actually encrypted.
+    auto fake_rtp_packet_transport = static_cast<rtc::FakePacketTransport*>(
+        srtp_transport1_->rtp_packet_transport());
+    EXPECT_FALSE(memcmp(fake_rtp_packet_transport->last_sent_packet()->data(),
+                        rtcp_packet_data, rtcp_len) == 0);
+
+    // Do the same thing in the opposite direction;
+    ASSERT_TRUE(
+        srtp_transport2_->SendPacket(rtcp, &rtcp_packet2to1, options, flags));
+    ASSERT_TRUE(last_recv_packet1_.data());
+    EXPECT_TRUE(memcmp(last_recv_packet1_.data(), rtcp_packet_data, rtcp_len) ==
+                0);
+    fake_rtp_packet_transport = static_cast<rtc::FakePacketTransport*>(
+        srtp_transport2_->rtp_packet_transport());
+    EXPECT_FALSE(memcmp(fake_rtp_packet_transport->last_sent_packet()->data(),
+                        rtcp_packet_data, rtcp_len) == 0);
+  }
+
+  void TestSendRecvPacket(bool enable_external_auth,
+                          int cs,
+                          const uint8_t* key1,
+                          int key1_len,
+                          const uint8_t* key2,
+                          int key2_len,
+                          const std::string& cipher_suite_name) {
+    EXPECT_EQ(key1_len, key2_len);
+    EXPECT_EQ(cipher_suite_name, rtc::SrtpCryptoSuiteToName(cs));
+    if (enable_external_auth) {
+      srtp_transport1_->EnableExternalAuth();
+      srtp_transport2_->EnableExternalAuth();
+    }
+    EXPECT_TRUE(
+        srtp_transport1_->SetRtpParams(cs, key1, key1_len, cs, key2, key2_len));
+    EXPECT_TRUE(
+        srtp_transport2_->SetRtpParams(cs, key2, key2_len, cs, key1, key1_len));
+    EXPECT_TRUE(srtp_transport1_->SetRtcpParams(cs, key1, key1_len, cs, key2,
+                                                key2_len));
+    EXPECT_TRUE(srtp_transport2_->SetRtcpParams(cs, key2, key2_len, cs, key1,
+                                                key1_len));
+    EXPECT_TRUE(srtp_transport1_->IsActive());
+    EXPECT_TRUE(srtp_transport2_->IsActive());
+    if (rtc::IsGcmCryptoSuite(cs)) {
+      EXPECT_FALSE(srtp_transport1_->IsExternalAuthActive());
+      EXPECT_FALSE(srtp_transport2_->IsExternalAuthActive());
+    } else if (enable_external_auth) {
+      EXPECT_TRUE(srtp_transport1_->IsExternalAuthActive());
+      EXPECT_TRUE(srtp_transport2_->IsExternalAuthActive());
+    }
+    TestSendRecvRtpPacket(cipher_suite_name);
+    TestSendRecvRtcpPacket(cipher_suite_name);
+  }
+
+  void TestSendRecvPacketWithEncryptedHeaderExtension(
+      const std::string& cs,
+      const std::vector<int>& encrypted_header_ids) {
+    bool rtcp = false;
+
+    int rtp_len = sizeof(kPcmuFrameWithExtensions);
+    int packet_size = rtp_len + rtc::rtp_auth_tag_len(cs);
+    char rtp_packet_data[packet_size];
+    memcpy(rtp_packet_data, kPcmuFrameWithExtensions, rtp_len);
+    // In order to be able to run this test function multiple times we can not
+    // use the same sequence number twice. Increase the sequence number by one.
+    rtc::SetBE16(reinterpret_cast<uint8_t*>(rtp_packet_data) + 2,
+                 ++sequence_number_);
+    rtc::CopyOnWriteBuffer rtp_packet(rtp_packet_data, rtp_len, packet_size);
+
+    char original_rtp_data[rtp_len];
+    memcpy(original_rtp_data, rtp_packet_data, rtp_len);
+
+    rtc::PacketOptions options;
+    int flags = cricket::PF_NORMAL;
+    // Send a packet from |srtp_transport1_| to |srtp_transport2_| and verify
+    // that the packet can be successfully received and decrypted.
+    ASSERT_TRUE(
+        srtp_transport1_->SendPacket(rtcp, &rtp_packet, options, flags));
+    ASSERT_TRUE(last_recv_packet2_.data());
+    EXPECT_TRUE(memcmp(last_recv_packet2_.data(), original_rtp_data, rtp_len) ==
+                0);
+    // Get the encrypted packet from underneath packet transport and verify the
+    // data and header extension are actually encrypted.
+    auto fake_rtp_packet_transport = static_cast<rtc::FakePacketTransport*>(
+        srtp_transport1_->rtp_packet_transport());
+    EXPECT_FALSE(memcmp(fake_rtp_packet_transport->last_sent_packet()->data(),
+                        original_rtp_data, rtp_len) == 0);
+    CompareHeaderExtensions(
+        reinterpret_cast<const char*>(
+            fake_rtp_packet_transport->last_sent_packet()->data()),
+        fake_rtp_packet_transport->last_sent_packet()->size(),
+        original_rtp_data, rtp_len, encrypted_header_ids, false);
+
+    // Do the same thing in the opposite direction;
+    ASSERT_TRUE(
+        srtp_transport2_->SendPacket(rtcp, &rtp_packet, options, flags));
+    ASSERT_TRUE(last_recv_packet1_.data());
+    EXPECT_TRUE(memcmp(last_recv_packet1_.data(), original_rtp_data, rtp_len) ==
+                0);
+    fake_rtp_packet_transport = static_cast<rtc::FakePacketTransport*>(
+        srtp_transport2_->rtp_packet_transport());
+    EXPECT_FALSE(memcmp(fake_rtp_packet_transport->last_sent_packet()->data(),
+                        original_rtp_data, rtp_len) == 0);
+    CompareHeaderExtensions(
+        reinterpret_cast<const char*>(
+            fake_rtp_packet_transport->last_sent_packet()->data()),
+        fake_rtp_packet_transport->last_sent_packet()->size(),
+        original_rtp_data, rtp_len, encrypted_header_ids, false);
+  }
+
+  void TestSendRecvEncryptedHeaderExtension(int cs,
+                                            const uint8_t* key1,
+                                            int key1_len,
+                                            const uint8_t* key2,
+                                            int key2_len,
+                                            const std::string& cs_name) {
+    std::vector<int> encrypted_headers;
+    encrypted_headers.push_back(1);
+    // Don't encrypt header ids 2 and 3.
+    encrypted_headers.push_back(4);
+    EXPECT_EQ(key1_len, key2_len);
+    EXPECT_EQ(cs_name, rtc::SrtpCryptoSuiteToName(cs));
+    srtp_transport1_->SetEncryptedHeaderExtensionIds(cricket::CS_LOCAL,
+                                                     encrypted_headers);
+    srtp_transport1_->SetEncryptedHeaderExtensionIds(cricket::CS_REMOTE,
+                                                     encrypted_headers);
+    srtp_transport2_->SetEncryptedHeaderExtensionIds(cricket::CS_LOCAL,
+                                                     encrypted_headers);
+    srtp_transport2_->SetEncryptedHeaderExtensionIds(cricket::CS_REMOTE,
+                                                     encrypted_headers);
+    EXPECT_TRUE(
+        srtp_transport1_->SetRtpParams(cs, key1, key1_len, cs, key2, key2_len));
+    EXPECT_TRUE(
+        srtp_transport2_->SetRtpParams(cs, key2, key2_len, cs, key1, key1_len));
+    EXPECT_TRUE(srtp_transport1_->IsActive());
+    EXPECT_TRUE(srtp_transport2_->IsActive());
+    EXPECT_FALSE(srtp_transport1_->IsExternalAuthActive());
+    EXPECT_FALSE(srtp_transport2_->IsExternalAuthActive());
+    TestSendRecvPacketWithEncryptedHeaderExtension(cs_name, encrypted_headers);
+  }
+
+  std::unique_ptr<SrtpTransport> srtp_transport1_;
+  std::unique_ptr<SrtpTransport> srtp_transport2_;
+
+  rtc::CopyOnWriteBuffer last_recv_packet1_;
+  rtc::CopyOnWriteBuffer last_recv_packet2_;
+  int sequence_number_ = 0;
 };
 
-TEST(SrtpTransportTest, SendPacket) {
-  auto rtp_transport = rtc::MakeUnique<MockRtpTransport>();
-  EXPECT_CALL(*rtp_transport, SendPacket(_, _, _, _)).WillOnce(Return(true));
-
-  SrtpTransport srtp_transport(std::move(rtp_transport), "a");
-
-  const bool rtcp = false;
-  rtc::CopyOnWriteBuffer packet;
-  rtc::PacketOptions options;
-  int flags = 0;
-  EXPECT_TRUE(srtp_transport.SendPacket(rtcp, &packet, options, flags));
-
-  // TODO(zstein): Also verify that the packet received by RtpTransport has been
-  // protected once SrtpTransport handles that.
-}
-
-// Test that SrtpTransport fires SignalPacketReceived when the underlying
-// RtpTransport fires SignalPacketReceived.
-TEST(SrtpTransportTest, SignalPacketReceived) {
-  auto rtp_transport = rtc::MakeUnique<MockRtpTransport>();
-  MockRtpTransport* rtp_transport_raw = rtp_transport.get();
-  SrtpTransport srtp_transport(std::move(rtp_transport), "a");
-
-  SignalPacketReceivedCounter counter(&srtp_transport);
-
-  rtp_transport_raw->PretendReceivedPacket();
-
-  EXPECT_EQ(1, counter.rtp_count());
-
-  // TODO(zstein): Also verify that the packet is unprotected once SrtpTransport
-  // handles that.
-}
+class SrtpTransportTestWithExternalAuth
+    : public SrtpTransportTest,
+      public testing::WithParamInterface<bool> {};
+
+TEST_P(SrtpTransportTestWithExternalAuth,
+       SendAndRecvPacket_AES_CM_128_HMAC_SHA1_80) {
+  bool enable_external_auth = GetParam();
+  TestSendRecvPacket(enable_external_auth, rtc::SRTP_AES128_CM_SHA1_80,
+                     kTestKey1, kTestKeyLen, kTestKey2, kTestKeyLen,
+                     rtc::CS_AES_CM_128_HMAC_SHA1_80);
+}
+
+TEST_F(SrtpTransportTest,
+       SendAndRecvPacketWithHeaderExtension_AES_CM_128_HMAC_SHA1_80) {
+  TestSendRecvEncryptedHeaderExtension(rtc::SRTP_AES128_CM_SHA1_80, kTestKey1,
+                                       kTestKeyLen, kTestKey2, kTestKeyLen,
+                                       rtc::CS_AES_CM_128_HMAC_SHA1_80);
+}
+
+TEST_P(SrtpTransportTestWithExternalAuth,
+       SendAndRecvPacket_AES_CM_128_HMAC_SHA1_32) {
+  bool enable_external_auth = GetParam();
+  TestSendRecvPacket(enable_external_auth, rtc::SRTP_AES128_CM_SHA1_32,
+                     kTestKey1, kTestKeyLen, kTestKey2, kTestKeyLen,
+                     rtc::CS_AES_CM_128_HMAC_SHA1_32);
+}
+
+TEST_F(SrtpTransportTest,
+       SendAndRecvPacketWithHeaderExtension_AES_CM_128_HMAC_SHA1_32) {
+  TestSendRecvEncryptedHeaderExtension(rtc::SRTP_AES128_CM_SHA1_32, kTestKey1,
+                                       kTestKeyLen, kTestKey2, kTestKeyLen,
+                                       rtc::CS_AES_CM_128_HMAC_SHA1_32);
+}
+
+TEST_P(SrtpTransportTestWithExternalAuth,
+       SendAndRecvPacket_SRTP_AEAD_AES_128_GCM) {
+  bool enable_external_auth = GetParam();
+  TestSendRecvPacket(enable_external_auth, rtc::SRTP_AEAD_AES_128_GCM,
+                     kTestKeyGcm128_1, kTestKeyGcm128Len, kTestKeyGcm128_2,
+                     kTestKeyGcm128Len, rtc::CS_AEAD_AES_128_GCM);
+}
+
+TEST_F(SrtpTransportTest,
+       SendAndRecvPacketWithHeaderExtension_SRTP_AEAD_AES_128_GCM) {
+  TestSendRecvEncryptedHeaderExtension(
+      rtc::SRTP_AEAD_AES_128_GCM, kTestKeyGcm128_1, kTestKeyGcm128Len,
+      kTestKeyGcm128_2, kTestKeyGcm128Len, rtc::CS_AEAD_AES_128_GCM);
+}
+
+TEST_P(SrtpTransportTestWithExternalAuth,
+       SendAndRecvPacket_SRTP_AEAD_AES_256_GCM) {
+  bool enable_external_auth = GetParam();
+  TestSendRecvPacket(enable_external_auth, rtc::SRTP_AEAD_AES_256_GCM,
+                     kTestKeyGcm256_1, kTestKeyGcm256Len, kTestKeyGcm256_2,
+                     kTestKeyGcm256Len, rtc::CS_AEAD_AES_256_GCM);
+}
+
+TEST_F(SrtpTransportTest,
+       SendAndRecvPacketWithHeaderExtension_SRTP_AEAD_AES_256_GCM) {
+  TestSendRecvEncryptedHeaderExtension(
+      rtc::SRTP_AEAD_AES_256_GCM, kTestKeyGcm256_1, kTestKeyGcm256Len,
+      kTestKeyGcm256_2, kTestKeyGcm256Len, rtc::CS_AEAD_AES_256_GCM);
+}
+
+// Run all tests both with and without external auth enabled.
+INSTANTIATE_TEST_CASE_P(ExternalAuth,
+                        SrtpTransportTestWithExternalAuth,
+                        ::testing::Values(true, false));
 

[Taylor Brandstetter, 2017/08/26 02:40:39]

It looks like all the equivalent tests from srtpfilter_unittest.cc are here
except for "TestSetParamsKeyTooShort"; might as well add that.

[Zhi Huang, 2017/08/29 18:40:35]

Oh, I missed that. Done.

 }  // namespace webrtc