Add debugging information to the SSL blocking page

net/cert/x509_certificate_ios.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 <CommonCrypto/CommonDigest.h>
 #include <Security/Security.h>
 
 #include <cert.h>
@@ skipping 85 matching lines @@
     if (ip_addrs)
       ip_addrs->clear();
     return;
   }
   x509_util::GetSubjectAltName(cert_handle, dns_names, ip_addrs);
 }
 
 // static
 bool X509Certificate::GetDEREncoded(OSCertHandle cert_handle,
                                     std::string* encoded) {
+  if (!cert_handle)
+    return false;
   ScopedCFTypeRef<CFDataRef> der_data(SecCertificateCopyData(cert_handle));
   if (!der_data)
     return false;
   encoded->assign(reinterpret_cast<const char*>(CFDataGetBytePtr(der_data)),
                   CFDataGetLength(der_data));
   return true;
 }
 
 // static
 bool X509Certificate::IsSameOSCert(X509Certificate::OSCertHandle a,
@@ skipping 110 matching lines @@
 
 // static
 void X509Certificate::GetPublicKeyInfo(OSCertHandle cert_handle,
                                        size_t* size_bits,
                                        PublicKeyType* type) {
   x509_util_ios::NSSCertificate nss_cert(cert_handle);
   x509_util::GetPublicKeyInfo(nss_cert.cert_handle(), size_bits, type);
 }
 
 }  // namespace net