Fix wrong _create_bin_int implementation in pssh-box.py

#885.

CONTRIBUTORS

@@ -38,6 +38,7 @@ Kongqun Yang <kqyang@google.com>
 Leandro Moreira <leandro.ribeiro.moreira@gmail.com>
 Leo Law <leoltlaw.gh@gmail.com>
 Piotr Srebrny <srebrny.piotr@gmail.com>
+Qingquan Wang <wangqq1103@gmail.com>
 Richard Eklycke <richard@eklycke.se>
 Rintaro Kuroiwa <rkuroiwa@google.com>
 Sanil Raut <sr1990003@gmail.com>

packager/tools/pssh/pssh-box.py

@@ -142,8 +142,7 @@ def _split_list_on(elems, sep):
 
 def _create_bin_int(value):
   """Creates a binary string as 4-byte array from the given integer."""
-  return (chr(value >> 24) + chr((value >> 16) & 0xff) +
-          chr((value >> 8) & 0xff) + chr(value & 0xff)).encode()
+  return struct.pack('>i', value)
 
 
 def _create_uuid(data):