Implement crypto signature verification routines using OpenSSL.

extensions/browser/api/cast_channel/cast_auth_ica.cc

Index: extensions/browser/api/cast_channel/cast_auth_ica.cc
diff --git a/extensions/browser/api/cast_channel/cast_auth_ica.cc b/extensions/browser/api/cast_channel/cast_auth_ica.cc
index ac97edca135c3d2db082c855f4362effc5be2b1a..0b570df14ae48dda92e24d4d143ab7b17022f367 100644
--- a/extensions/browser/api/cast_channel/cast_auth_ica.cc
+++ b/extensions/browser/api/cast_channel/cast_auth_ica.cc
@@ -686,6 +686,10 @@ base::StringPiece GetTrustedICAPublicKey(const base::StringPiece& data) {
   AuthorityKeyStore& authority_keys_store = g_authority_keys_store.Get();
   scoped_refptr<net::X509Certificate> ica_cert =
       net::X509Certificate::CreateFromBytes(data.data(), data.size());
+  if (!ica_cert.get()) {
+    LOG(ERROR) << "Invalid ICA certificate.";
+    return "";
+  }
   return authority_keys_store.GetICAPublicKeyFromFingerprint(
       net::X509Certificate::CalculateFingerprint256(
           ica_cert->os_cert_handle()));