diff --git a/download_from_google_storage.py b/download_from_google_storage.py
index bbb9e64f3..e00ac6262 100755
--- a/download_from_google_storage.py
+++ b/download_from_google_storage.py
@@ -45,8 +45,12 @@ class Gsutil(object):
 
   def get_sub_env(self):
     env = os.environ.copy()
-    if self.boto_path:
+    if self.boto_path == os.devnull:
+      env['AWS_CREDENTIAL_FILE'] = ''
+      env['BOTO_CONFIG'] = ''
+    elif self.boto_path:
       env['AWS_CREDENTIAL_FILE'] = self.boto_path
+      env['BOTO_CONFIG'] = self.boto_path
     else:
       custompath = env.get('AWS_CREDENTIAL_FILE', '~/.boto') + '.depot_tools'
       custompath = os.path.expanduser(custompath)
@@ -297,7 +301,10 @@ def main(args):
                     help='Alias for "gsutil config".  Run this if you want '
                          'to initialize your saved Google Storage '
                          'credentials.')
-  parser.add_option('-p', '--platform', 
+  parser.add_option('-n', '--no_auth', action='store_true',
+                    help='Skip auth checking.  Use if it\'s known that the '
+                         'target bucket is a public bucket.')
+  parser.add_option('-p', '--platform',
                     help='A regular expression that is compared against '
                          'Python\'s sys.platform. If this option is specified, '
                          'the download will happen only if there is a match.')
@@ -311,6 +318,10 @@ def main(args):
             options.platform)
       return 0
 
+  # Set the boto file to /dev/null if we don't need auth.
+  if options.no_auth:
+    options.boto = os.devnull
+
   # Make sure we can find a working instance of gsutil.
   if os.path.exists(GSUTIL_DEFAULT_PATH):
     gsutil = Gsutil(GSUTIL_DEFAULT_PATH, boto_path=options.boto)
diff --git a/tests/download_from_google_storage_unittests.py b/tests/download_from_google_storage_unittests.py
index 24cc7997d..77dd40a67 100755
--- a/tests/download_from_google_storage_unittests.py
+++ b/tests/download_from_google_storage_unittests.py
@@ -82,7 +82,7 @@ class GstoolsUnitTests(unittest.TestCase):
     self.assertEqual(err_lines[0], 'gsutil version 3.25')
     self.assertEqual(
         err_lines[1],
-        'checksum 010822c61d38d70ac23600bc955fccf5 (OK)')
+        'checksum c9cffb512f467c0aa54880788b9ee6ca (OK)')
 
   def test_get_sha1(self):
     lorem_ipsum = os.path.join(self.base_path, 'lorem_ipsum.txt')
@@ -179,6 +179,12 @@ class DownloadTests(unittest.TestCase):
             ('ls', input_filename)),
         ('check_call',
             ('cp', '-q', input_filename, output_filename))]
+    if sys.platform != 'win32':
+      expected_calls.append(
+          ('check_call',
+           ('ls',
+            '-L',
+            'gs://sometesturl/7871c8e24da15bad8b0be2c36edc9dc77e37727f')))
     expected_output = [
         '0> Downloading %s...' % output_filename]
     expected_ret_codes = []
@@ -251,6 +257,12 @@ class DownloadTests(unittest.TestCase):
         ('check_call',
             ('cp', '-q', input_filename, output_filename))
     ]
+    if sys.platform != 'win32':
+      expected_calls.append(
+          ('check_call',
+           ('ls',
+            '-L',
+            'gs://sometesturl/7871c8e24da15bad8b0be2c36edc9dc77e37727f')))
     self.assertEqual(self.gsutil.history, expected_calls)
     self.assertEqual(code, 101)
 
@@ -274,6 +286,12 @@ class DownloadTests(unittest.TestCase):
             ('ls', input_filename)),
         ('check_call',
             ('cp', '-q', input_filename, output_filename))]
+    if sys.platform != 'win32':
+      expected_calls.append(
+          ('check_call',
+           ('ls',
+            '-L',
+            'gs://sometesturl/7871c8e24da15bad8b0be2c36edc9dc77e37727f')))
     self.assertEqual(self.gsutil.history, expected_calls)
     self.assertEqual(code, 0)
 
diff --git a/tests/upload_to_google_storage_unittests.py b/tests/upload_to_google_storage_unittests.py
index 8879f5cf8..24ac6b89c 100755
--- a/tests/upload_to_google_storage_unittests.py
+++ b/tests/upload_to_google_storage_unittests.py
@@ -29,7 +29,7 @@ TEST_DIR = os.path.dirname(os.path.abspath(__file__))
 
 class UploadTests(unittest.TestCase):
   def setUp(self):
-    self.gsutil = GsutilMock(GSUTIL_DEFAULT_PATH)
+    self.gsutil = GsutilMock(GSUTIL_DEFAULT_PATH, None)
     self.temp_dir = tempfile.mkdtemp(prefix='gstools_test')
     self.base_path = os.path.join(self.temp_dir, 'gstools')
     shutil.copytree(os.path.join(TEST_DIR, 'gstools'), self.base_path)