Added sha256 sums for build outputs

tools/signing_script.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 import imp
 import optparse
 import os
 import subprocess
@@ skipping 114 matching lines @@
   run([GSUTIL, 'cp', bucket, destination])
 
 def upload_to_new_location(channel, config, source_zip):
   namer = bot_utils.GCSNamer(channel,
                              bot_utils.ReleaseType.SIGNED)
   zipfilename = namer.editor_zipfilename(config['system'], config['bits'])
   bucket = namer.editor_zipfilepath(config['revision'], config['system'],
                                     config['bits'])
 
   if not DRY_RUN:
-    bot_utils.CreateChecksumFile(source_zip, mangled_filename=zipfilename)
+    bot_utils.CreateMD5ChecksumFile(source_zip, mangled_filename=zipfilename)
+    bot_utils.CreateSha256ChecksumFile(source_zip,
+                                       mangled_filename=zipfilename)
   md5_zip_file = source_zip + '.md5sum'
+  sha256_zip_file = source_zip + '.sha256sum'
 
   run([GSUTIL, 'cp', source_zip, bucket])
   run([GSUTIL, 'cp', md5_zip_file, bucket + '.md5sum'])
+  run([GSUTIL, 'cp', sha256_zip_file, bucket + '.sha256sum'])
   run([GSUTIL, 'setacl', 'public-read', bucket])
   run([GSUTIL, 'setacl', 'public-read', bucket + '.md5sum'])
+  run([GSUTIL, 'setacl', 'public-read', bucket + '.sha256sum'])
 
 def upload_msi_installer_to_new_location(channel, config, signed_msi):
   namer = bot_utils.GCSNamer(channel, bot_utils.ReleaseType.SIGNED)
   bucket = namer.editor_installer_filepath(
       config['revision'], config['system'], config['bits'], 'msi')
   run([GSUTIL, 'cp', '-a', 'public-read', signed_msi, bucket])
 
 def main():
   if sys.platform != 'linux2':
     print "This script was only tested on linux. Please run it on linux!"
@@ skipping 120 matching lines @@
 
         # Upload *.msi installer and set 'public-read ACL
         if system == 'win32':
           postsign_msi = os.path.join(
               postsign_dir, locations[system]['msi_scratch'] % config)
           upload_msi_installer_to_new_location(
               options.channel, config, postsign_msi)
 
 if __name__ == '__main__':
   main()
-