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Old 08-02-2016, 01:23 PM   #1
0x53h
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Registered: May 2012
Posts: 23

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base64 encoding in program vs piping to base64 command-line utility


What's going on when I pipe a string into base64 on the command line vs base64 encoding in perl or python?

Code:
user@box:~/$ perl -MMIME::Base64 -e 'print encode_base64("user\@example.com\0user\@example.com\0test")';                                                                                                 
dmljdG9yQHc2LmlvAHZpY3RvckB3Ni5pbwB0ZXN0

user@box:~/$ python -c "import base64; print(base64.b64encode('user@example.com\00user@example.com\00test'))"
dmljdG9yQHc2LmlvAHZpY3RvckB3Ni5pbwB0ZXN0

user@box:~/$ python -c "print('user@example.com\00user@example.com\00test').strip()" | base64                                                                                                      
dmljdG9yQHc2LmlvAHZpY3RvckB3Ni5pbwB0ZXN0Cg==
 
Old 08-03-2016, 04:54 PM   #2
Rinndalir
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Look at python -m pydoc print

Code:
A "'\n'" character is written at the end, unless the "print" statement
ends with a comma.
 
Old 08-04-2016, 01:01 AM   #3
chrism01
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Registered: Aug 2004
Location: Sydney
Distribution: Centos 6.10, Centos 7.5
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I knew that rang a bell, just couldn't remember until Rinndalir posted.

I came across the same thing a while back in bash
Code:
echo aaa |base64
YWFhCg==

echo -n aaa |base64
YWFh

Last edited by chrism01; 08-08-2016 at 01:06 AM. Reason: typo
 
Old 08-05-2016, 10:39 AM   #4
0x53h
LQ Newbie
 
Registered: May 2012
Posts: 23

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I see. I don't understand how to provide a coma at the end of the print statement. It can be done in Python2 with a future import making that line a bit awkard to type. Thanks though, this clears up the mystery. I believed .strip() would have taken care of that "\n".

Code:
$ python -c "from __future__ import print_function; print('user@example.com\00user@example.com\00test', end='')" | base64
dXNlckBleGFtcGxlLmNvbQB1c2VyQGV4YW1wbGUuY29tAHRlc3Q=
TIL: python -m pydoc foo and why so many base64 encoded strings end in ==
 
  


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