[login_manager] Use keygen helper to generate owner key

owner_key.cc

 // Copyright (c) 2010 The Chromium OS 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 "login_manager/owner_key.h"
 
 #include <base/crypto/rsa_private_key.h>
 #include <base/file_path.h>
 #include <base/file_util.h>
 #include <base/logging.h>
 #include <base/scoped_ptr.h>
 
+#include "login_manager/child_job.h"
 #include "login_manager/nss_util.h"
 #include "login_manager/system_utils.h"
 
 namespace login_manager {
 
 // Note: this structure is an ASN.1 which encodes the algorithm used
 // with its parameters. This is defined in PKCS #1 v2.1 (RFC 3447).
 // It is encoding: { OID sha1WithRSAEncryption      PARAMETERS NULL }
 // static
 const uint8 OwnerKey::kAlgorithm[15] = {
@@ skipping 109 matching lines @@
   if (!util->Sign(reinterpret_cast<const uint8*>(data),
                   data_len,
                   OUT_signature,
                   private_key.get())) {
     LOG(ERROR) << "Signing of " << data << " failed";
     return false;
   }
   return true;
 }
 
+
+int OwnerKey::StartGeneration(ChildJobInterface* generator) {
+  int pid = fork();
+  if (pid == 0) {
+    generator->Run();
+    exit(1);  // Run() is not supposed to return.
+  }
+  return pid;
+}
+
 }  // namespace login_manager