Implement crypto signature verification routines using OpenSSL.

extensions/browser/api/cast_channel/cast_socket.cc

Index: extensions/browser/api/cast_channel/cast_socket.cc
diff --git a/extensions/browser/api/cast_channel/cast_socket.cc b/extensions/browser/api/cast_channel/cast_socket.cc
index 83994df6b1c413a28d43401689a4db0c8b973224..95c6f959a847ff7dbb5b276763396641883fe0fb 100644
--- a/extensions/browser/api/cast_channel/cast_socket.cc
+++ b/extensions/browser/api/cast_channel/cast_socket.cc
@@ -177,6 +177,9 @@ bool CastSocket::ExtractPeerCert(std::string* cert) {
 
 bool CastSocket::VerifyChallengeReply() {
   AuthResult result = AuthenticateChallengeReply(*challenge_reply_, peer_cert_);
+  if (result.success()) {
+    VLOG(1) << result.error_message;
+  }
   logger_->LogSocketChallengeReplyEvent(channel_id_, result);
   return result.success();
 }