Support generation of EC keys using P256 curve and support ECDSA certs.

talk/app/webrtc/dtlsidentitystore.cc

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 45 matching lines @@
  public:
   explicit WorkerTask(DtlsIdentityStore* store)
       : signaling_thread_(rtc::Thread::Current()), store_(store) {
     store_->SignalDestroyed.connect(this, &WorkerTask::OnStoreDestroyed);
   }
 
   virtual ~WorkerTask() { DCHECK(rtc::Thread::Current() == signaling_thread_); }
 
  private:
   void GenerateIdentity_w() {
-    rtc::scoped_ptr<rtc::SSLIdentity> identity(
-        rtc::SSLIdentity::Generate(DtlsIdentityStore::kIdentityName));
+    rtc::scoped_ptr<rtc::SSLIdentity> identity(rtc::SSLIdentity::Generate(
+        DtlsIdentityStore::kIdentityName, rtc::KT_RSA));
 
     {
       rtc::CritScope cs(&cs_);
       if (store_) {
         store_->PostGenerateIdentityResult_w(identity.Pass());
       }
     }
   }
 
   void OnMessage(rtc::Message* msg) override {
@@ skipping 148 matching lines @@
 
 void DtlsIdentityStore::PostGenerateIdentityResult_w(
     rtc::scoped_ptr<rtc::SSLIdentity> identity) {
   DCHECK(rtc::Thread::Current() == worker_thread_);
 
   IdentityResultMessageData* msg =
       new IdentityResultMessageData(identity.release());
   signaling_thread_->Post(this, MSG_GENERATE_IDENTITY_RESULT, msg);
 }
 }  // namespace webrtc