Add debugging information to the SSL blocking page

net/cert/x509_certificate_openssl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/cert/x509_certificate.h"
 
 #include <openssl/asn1.h>
 #include <openssl/bytestring.h>
 #include <openssl/crypto.h>
 #include <openssl/obj_mac.h>
@@ skipping 291 matching lines @@
 
 // static
 X509_STORE* X509Certificate::cert_store() {
   return X509InitSingleton::GetInstance()->store();
 }
 
 // static
 bool X509Certificate::GetDEREncoded(X509Certificate::OSCertHandle cert_handle,
                                     std::string* encoded) {
   base::StringPiece der;
-  if (!x509_util::GetDER(cert_handle, &der))
+  if (!cert_handle || !x509_util::GetDER(cert_handle, &der))
     return false;
   encoded->assign(der.data(), der.length());
   return true;
 }
 
 // static
 bool X509Certificate::IsSameOSCert(X509Certificate::OSCertHandle a,
                                    X509Certificate::OSCertHandle b) {
   DCHECK(a && b);
   if (a == b)
@@ skipping 110 matching lines @@
       if (X509_NAME_cmp(issuer, cert_names[n]) == 0) {
         return true;
       }
     }
   }
 
   return false;
 }
 
 }  // namespace net