net: retain leading zero bytes in X.509 serial numbers.

net/base/x509_certificate_mac.cc

 // Copyright (c) 2011 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/base/x509_certificate.h"
 
 #include <CommonCrypto/CommonDigest.h>
 #include <CoreServices/CoreServices.h>
 #include <Security/Security.h>
 #include <time.h>
@@ skipping 185 matching lines @@
     if (!CSSMOIDEqual(&fields.fields[field].FieldOid,
                       &CSSMOID_X509V1SerialNumber)) {
       continue;
     }
     ret.assign(
         reinterpret_cast<char*>(fields.fields[field].FieldValue.Data),
         fields.fields[field].FieldValue.Length);
     break;
   }
 
-  // Remove leading zeros.
-  while (ret.size() > 1 && ret[0] == 0)
-    ret = ret.substr(1, ret.size() - 1);
-
   return ret;
 }
 
 // Creates a SecPolicyRef for the given OID, with optional value.
 OSStatus CreatePolicy(const CSSM_OID* policy_OID,
                       void* option_data,
                       size_t option_length,
                       SecPolicyRef* policy) {
   SecPolicySearchRef search;
   OSStatus err = SecPolicySearchCreate(CSSM_CERT_X_509v3, policy_OID, NULL,
@@ skipping 1119 matching lines @@
   CSSM_DATA cert_data;
   OSStatus status = SecCertificateGetData(cert_handle, &cert_data);
   if (status)
     return false;
 
   return pickle->WriteData(reinterpret_cast<char*>(cert_data.Data),
                            cert_data.Length);
 }
 
 }  // namespace net