[autotest] Update login_OwnershipApi to use protobufs

client/cros/ownership.py

 # Copyright (c) 2011 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.
 
 import logging, os, tempfile
 from autotest_lib.client.bin import utils
 from autotest_lib.client.common_lib import autotemp, error
 import common
 import constants, cryptohome, login
 
@@ skipping 47 matching lines @@
 
 def pairgen():
     """Generate a self-signed cert and associated private key.
 
     Generates a self-signed X509 certificate and the associated private key.
     The key is 2048 bits.  The generated material is stored in PEM format
     and the paths to the two files are returned.
 
     The caller is responsible for cleaning up these files.
     """
-    keyfile = scoped_tempfile.tempdir.name + 'private.key'
-    certfile = scoped_tempfile.tempdir.name + 'cert.pem'
+    keyfile = scoped_tempfile.tempdir.name + '/private.key'
+    certfile = scoped_tempfile.tempdir.name + '/cert.pem'
     cmd = '%s -x509 -subj %s -newkey rsa:2048 -nodes -keyout %s -out %s' % (
         OPENSSLREQ, '/CN=me', keyfile, certfile)
     system_output_on_fail(cmd)
     return (keyfile, certfile)
 
 
 def push_to_nss(keyfile, certfile, nssdb):
     """Takes a pre-generated key pair and pushes them to an NSS DB.
 
     Given paths to a private key and cert in PEM format, stores the pair
@@ skipping 77 matching lines @@
     except:
         err.fo.seek(0)
         logging.error(err.fo.read())
         raise
 
     sig.fo.seek(0)
     sig_data = sig.fo.read()
     if not sig_data:
         raise error.TestFail('Empty signature!')
     return sig_data
-