Relanding: Allow the DTLS fingerprint verification to occur after the handshake.

webrtc/base/opensslstreamadapter.h

Index: webrtc/base/opensslstreamadapter.h
diff --git a/webrtc/base/opensslstreamadapter.h b/webrtc/base/opensslstreamadapter.h
index 05e81021696162b626029bf2a9d723475305665c..017ccaaa8b1a6616f5c6fbac1b7d485c206c9da5 100644
--- a/webrtc/base/opensslstreamadapter.h
+++ b/webrtc/base/opensslstreamadapter.h
@@ -107,6 +107,8 @@ class OpenSSLStreamAdapter : public SSLStreamAdapter {
   bool SetDtlsSrtpCryptoSuites(const std::vector<int>& crypto_suites) override;
   bool GetDtlsSrtpCryptoSuite(int* crypto_suite) override;
 
+  bool IsTlsConnected() override { return state_ == SSL_CONNECTED; }
+
   // Capabilities interfaces
   static bool HaveDtls();
   static bool HaveDtlsSrtp();
@@ -165,9 +167,10 @@ class OpenSSLStreamAdapter : public SSLStreamAdapter {
   // SSL library configuration
   SSL_CTX* SetupSSLContext();
   // SSL verification check
-  bool SSLPostConnectionCheck(SSL* ssl, const char* server_name,
-                              const X509* peer_cert,
-                              const std::string& peer_digest);
+  bool SSLPostConnectionCheck(SSL* ssl,
+                              const char* server_name,
+                              const X509* peer_cert);
+  bool VerifyPeerCertificate();
   // SSL certification verification error handler, called back from
   // the openssl library. Returns an int interpreted as a boolean in
   // the C style: zero means verification failure, non-zero means
@@ -197,6 +200,7 @@ class OpenSSLStreamAdapter : public SSLStreamAdapter {
   // the peer must present.
   Buffer peer_certificate_digest_value_;
   std::string peer_certificate_digest_algorithm_;
+  bool certificate_verified_ = false;
 
   // OpenSSLAdapter::custom_verify_callback_ result
   bool custom_verification_succeeded_;