diff --git a/script/lib/util.py b/script/lib/util.py
index c66dca810e67..c78ca213e199 100644
--- a/script/lib/util.py
+++ b/script/lib/util.py
@@ -30,6 +30,7 @@ def scoped_cwd(path):
 
 
 def download(text, url, path):
+  safe_mkdir(os.path.dirname(path))
   with open(path, 'w') as local_file:
     web_file = urllib2.urlopen(url)
     file_size = int(web_file.info().getheaders("Content-Length")[0])
@@ -55,6 +56,7 @@ def download(text, url, path):
       print "%s done." % (text)
     else:
       print
+  return path
 
 
 def extract_tarball(tarball_path, member, destination):
@@ -120,3 +122,28 @@ def execute(argv):
 
 def get_atom_shell_version():
   return subprocess.check_output(['git', 'describe', '--tags']).strip()
+
+
+def s3_config():
+  config = (os.environ.get('ATOM_SHELL_S3_BUCKET', ''),
+            os.environ.get('ATOM_SHELL_S3_ACCESS_KEY', ''),
+            os.environ.get('ATOM_SHELL_S3_SECRET_KEY', ''))
+  message = ('Error: Please set the $ATOM_SHELL_S3_BUCKET, '
+             '$ATOM_SHELL_S3_ACCESS_KEY, and '
+             '$ATOM_SHELL_S3_SECRET_KEY environment variables')
+  assert all(len(c) for c in config), message
+  return config
+
+
+def s3put(bucket, access_key, secret_key, prefix, key_prefix, files):
+  args = [
+    's3put',
+    '--bucket', bucket,
+    '--access_key', access_key,
+    '--secret_key', secret_key,
+    '--prefix', prefix,
+    '--key_prefix', key_prefix,
+    '--grant', 'public-read'
+  ] + files
+
+  execute(args)
diff --git a/script/upload-checksums.py b/script/upload-checksums.py
new file mode 100755
index 000000000000..34a58fce5e90
--- /dev/null
+++ b/script/upload-checksums.py
@@ -0,0 +1,70 @@
+#!/usr/bin/env python
+
+import argparse
+import hashlib
+import os
+import tempfile
+
+from lib.util import download, rm_rf, s3_config, s3put
+
+
+DIST_URL = 'https://gh-contractor-zcbenz.s3.amazonaws.com/atom-shell/dist/'
+
+
+def main():
+  args = parse_args()
+
+  url = DIST_URL + args.version + '/'
+  directory, files = download_files(url, get_files_list(args.version))
+  checksums = [
+    create_checksum('sha1', directory, 'SHASUMS.txt', files),
+    create_checksum('sha256', directory, 'SHASUMS256.txt', files)
+  ]
+
+  bucket, access_key, secret_key = s3_config()
+  s3put(bucket, access_key, secret_key, directory,
+        'atom-shell/dist/{0}'.format(args.version), checksums)
+
+  rm_rf(directory)
+
+
+def parse_args():
+  parser = argparse.ArgumentParser(description='upload sumsha file')
+  parser.add_argument('-v', '--version', help='Specify the version',
+                      required=True)
+  return parser.parse_args()
+
+
+def get_files_list(version):
+  return [
+    'node-{0}.tar.gz'.format(version),
+    'node.lib',
+    'x64/node.lib',
+  ]
+
+
+def download_files(url, files):
+  directory = tempfile.mkdtemp(prefix='atom-shell-tmp')
+  return directory, [
+    download(f, url + f, os.path.join(directory, f))
+    for f in files
+  ]
+
+
+def create_checksum(algorithm, directory, filename, files):
+  lines = []
+  for path in files:
+    h = hashlib.new(algorithm)
+    with open(path, 'r') as f:
+      h.update(f.read())
+      lines.append(h.hexdigest() + '  ' + os.path.relpath(path, directory))
+
+  checksum_file = os.path.join(directory, filename)
+  with open(checksum_file, 'w') as f:
+    f.write('\n'.join(lines) + '\n')
+  return checksum_file
+
+
+if __name__ == '__main__':
+  import sys
+  sys.exit(main())
diff --git a/script/upload.py b/script/upload.py
index afe0dbbd61e3..4cadf918d029 100755
--- a/script/upload.py
+++ b/script/upload.py
@@ -9,7 +9,8 @@ import sys
 import tempfile
 
 from lib.config import DIST_ARCH, NODE_VERSION, TARGET_PLATFORM
-from lib.util import get_atom_shell_version, scoped_cwd, safe_mkdir, execute
+from lib.util import get_atom_shell_version, scoped_cwd, safe_mkdir, execute, \
+                     s3_config, s3put
 from lib.github import GitHub
 
 
@@ -48,6 +49,11 @@ def main():
   upload_atom_shell(github, release_id, os.path.join(DIST_DIR, DIST_NAME))
   upload_atom_shell(github, release_id, os.path.join(DIST_DIR, SYMBOLS_NAME))
   if args.publish_release:
+    # Upload the SHASUMS.txt.
+    execute([sys.executable,
+             os.path.join(SOURCE_ROOT, 'script', 'upload-checksums.py')])
+
+    # Press the publish button.
     publish_release(github, release_id)
 
   # Upload node's headers to S3.
@@ -176,31 +182,6 @@ def auth_token():
   return token
 
 
-def s3_config():
-  config = (os.environ.get('ATOM_SHELL_S3_BUCKET', ''),
-            os.environ.get('ATOM_SHELL_S3_ACCESS_KEY', ''),
-            os.environ.get('ATOM_SHELL_S3_SECRET_KEY', ''))
-  message = ('Error: Please set the $ATOM_SHELL_S3_BUCKET, '
-             '$ATOM_SHELL_S3_ACCESS_KEY, and '
-             '$ATOM_SHELL_S3_SECRET_KEY environment variables')
-  assert all(len(c) for c in config), message
-  return config
-
-
-def s3put(bucket, access_key, secret_key, prefix, key_prefix, files):
-  args = [
-    's3put',
-    '--bucket', bucket,
-    '--access_key', access_key,
-    '--secret_key', secret_key,
-    '--prefix', prefix,
-    '--key_prefix', key_prefix,
-    '--grant', 'public-read'
-  ] + files
-
-  execute(args)
-
-
 def touch_x64_node_lib():
   x64_dir = os.path.join(OUT_DIR, 'x64')
   safe_mkdir(x64_dir)