fe23bc40dc
(This is a merge from the Widevine repo of http://go/wvgerrit/131084.) This patch updates the OEM Certificate scripts to work in Python 3. Previously, the scripts were nominally Python-2-only, though I actually couldn't get them to run in either Python 2 or 3. The following changes were necessary to make the scripts work in Python 3: 1) print() is now a function, not a keyword. 2) xrange() is now range(). 3) StringIO is now part of the io package. 4) Python 3 no longer lets you mix strings and byte buffers indiscriminately. As such, the code needed to be made more crisp about when it is treating a file or other blob of data as binary vs. text. Many instances of StringIO had to become BytesIO, and several literals had to be turned into byte literals. Passphrase command-line parameters are now parsed to UTF-8 bytes during argument parsing. Bug: 151736642 Test: oem_certificate_test.py Change-Id: I8ea5d0fda2ea5a2c0289be7612be0b4e508c4abf