How can I base64-encode unicode strings in JavaScript and Python?

Question

I need an encript arithmetic, which encript text to text.

the input text could be unicode, and the output should be a-z A-Z 0-9 - . (64 char max)

and it could be decrypt to unicode again.

it should implement in javascript and python.

If there is already some library could do this, great, if there is not, could you tell me.

Let me talk about why

To cheat China Greate Fire Wall , and GAE https has been blocked at china. Angry for this damn goverment.

Please add some clarification about the process. Can you show an example of input and expected output? Why does it need to be implemented in JS and Python? That sounds like a pretty exotic requirement. What exactly do you need this for? — Pekka
– Pekka, Commented Oct 13, 2010 at 9:37
It sounds like you're implementing something catastrophically insecure, and chances are the correct answer is "stop" and "use HTTPS". — Glenn Maynard
– Glenn Maynard, Commented Oct 13, 2010 at 9:50
Re why: Now that's a noble cause and gets my thumbs up any day, but is the Great Firewall really this simple? Hard to believe — Pekka
– Pekka, Commented Oct 13, 2010 at 12:58
I am not sure. Base on some experience, there are url filter and content filter, and ip filter, e.g. if url contains groups.google.com wheather it is the domain position, it will blocked, if content contains some sensitive words it will blocked, and https port for specific ip is blocked manually. — guilin 桂林
– guilin 桂林, Commented Oct 13, 2010 at 14:45

Tim Pietzcker · Accepted Answer · 2010-10-13 10:02:54Z

10

You might want to look at the base64 module. In Python 2.x (starting with 2.4):

>>> import base64
>>> s=u"Rückwärts"
>>> s
u'R\xfcckw\xe4rts'
>>> b=base64.b64encode(s.encode("utf-8"))
>>> b
'UsO8Y2t3w6RydHM='
>>> d=base64.b64decode(b)
>>> d
'R\xc3\xbcckw\xc3\xa4rts'
>>> d.decode("utf-8")
u'R\xfcckw\xe4rts'
>>> print d.decode("utf-8")
Rückwärts

edited Oct 13, 2010 at 10:02

answered Oct 13, 2010 at 9:39

Tim Pietzcker

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poke · Accepted Answer · 2010-10-13 15:21:03Z

4

You are looking for a base64 encoding. In JavaScript and Python 2 this is a bit complicated as the latter doesn't support unicode natively and for the former you would need to implement an Unicode encoding yourself.

Python 3 solution

>>> from base64 import b64encode, b64decode
>>> b64encode( 'Some random text with unicode symbols: äöü今日は'.encode() )
b'U29tZSByYW5kb20gdGV4dCB3aXRoIHVuaWNvZGUgc3ltYm9sczogw6TDtsO85LuK5pel44Gv'
>>> b64decode( b'U29tZSByYW5kb20gdGV4dCB3aXRoIHVuaWNvZGUgc3ltYm9sczogw6TDtsO85LuK5pel44Gv' )
b'Some random text with unicode symbols: \xc3\xa4\xc3\xb6\xc3\xbc\xe4\xbb\x8a\xe6\x97\xa5\xe3\x81\xaf'
>>> _.decode()
'Some random text with unicode symbols: äöü今日は'

edited Oct 13, 2010 at 15:21

answered Oct 13, 2010 at 9:41

poke

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3 Comments

AndiDog Over a year ago

Does Python 3 default to UTF-8 when calling .encode() without arguments?

AndiDog Over a year ago

Ok, got it. The default encoding was changed from ASCII to UTF-8. I think encode() somewhat violates the rule of "explicit over implicit".

poke Over a year ago

Python 3 strings are unicode, calling .encode() creates a bytes object that holds no information about the encoding. .decode() on bytes object does the reverse.

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