Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #106949

Re: How to XOR a byte output?

Path csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups comp.lang.python
Subject Re: How to XOR a byte output?
Date Wed, 13 Apr 2016 09:30:48 -0600
Lines 25
Message-ID <mailman.77.1460561490.15650.python-list@python.org> (permalink)
References <387506b1-b645-4907-a45c-81a8c3043099@googlegroups.com> <CAPTjJmpuG=ew7FPwhdtsgDyjDc8d_T8-zbWuVxZy_sUUGj+R0Q@mail.gmail.com> <mailman.71.1460554158.15650.python-list@python.org> <874mb5twha.fsf@elektro.pacujo.net> <CALwzidmrOy9T=4N86F6eV3RdAP+TSAKUBXZKUA1wNk3RxAXTXw@mail.gmail.com>
Mime-Version 1.0
Content-Type text/plain; charset=UTF-8
X-Trace news.uni-berlin.de yNaArXWjf/vC1QSYk7ZmcA/IAjrCOgKPnthJVgKIe4uQ==
Return-Path <ian.g.kelly@gmail.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.013
X-Spam-Evidence '*H*': 0.97; '*S*': 0.00; 'subject:How': 0.09; 'xor': 0.09; 'wed,': 0.15; "'hello": 0.16; '2016': 0.16; 'data)': 0.16; 'received:io': 0.16; 'received:psf.io': 0.16; 'wrote:': 0.16; 'obviously': 0.16; 'byte': 0.18; 'integer': 0.18; '>>>': 0.20; 'fairly': 0.22; 'am,': 0.23; 'this:': 0.23; 'skip:b 30': 0.24; 'header:In-Reply-To:1': 0.24; "doesn't": 0.26; 'chris': 0.26; 'message-id:@mail.gmail.com': 0.27; 'looks': 0.29; '13,': 0.29; 'skip:b 40': 0.29; 'code': 0.30; 'guess': 0.31; 'operations.': 0.33; 'received:google.com': 0.35; 'skip:b 50': 0.35; 'but': 0.36; 'received:209.85': 0.36; 'to:addr:python-list': 0.36; 'subject:?': 0.36; 'subject:: ': 0.37; 'received:209.85.213': 0.37; 'received:209': 0.38; 'data': 0.39; 'to:addr:python.org': 0.40; 'more': 0.63; '>>>>>': 0.66; "op's": 0.84; 'to:name:python': 0.84
DKIM-Signature v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=rkfGi3T5XzgVRN2ZreFzmgY9sWvdTVbxqa46GcVAF20=; b=b2I2MtZgaOxWeBgub9ip1iGR706xJ4yvx1fi/aeAz8ZWJPNIA/2Xl4J0v1QdakHavQ R/ffoS1KJ3yyDTxvcvNiZKE4hLaKpLT899k81HX0znOsOaUwbNAxKmHfKJVotwJilG6O 9U3dTtJWmkmVvxz1UdsyDQ8hy4CjoMc5o/gJpNTL6MxDUtFZMl143sPArvakmF2URTEI CsgxN0VN0SCeHu9pVBLRRaG6xz2AsM1bQc/DkflbP161WvszdD+m8q1infAoz1cP14e8 NRkQaAA8IWmlU2YObfcVOFI7DQbBtJ7EohU0WNiRQpppI5UcUFWb8ES9XsAuHEfpdQN9 Qn3w==
X-Google-DKIM-Signature v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=rkfGi3T5XzgVRN2ZreFzmgY9sWvdTVbxqa46GcVAF20=; b=fK6wbaRYQ1BfV8ZeNQGabkFZduG8RGdhB2Vb9F5iY28+jzG9WRJfMMBsEcRrMQ/3+3 lppt0Ibe/IyfMR+jWCcdc8JU2/5GE22qvTBphsbVmpq1DUjC05Qd1htoS4AZK5OPp1Oe 4ug2Vw7BeJSh7g3gGJpMISLaimRx1vACMwXjW+dHSF6I3u/UIWmYOKrJpvm7KwjGWg80 1Y+va5eC6tpn2ZbFTKEJeDsNVVkWdy+l+W/qVjjKmik6i8PoEb1Erlo2EnzWce2Pcek7 eOm6+fO1fPBzsGkWT4Wlwj8+bZdgbvhgbLT0jGRSe4d1z+QUyrJqb9ZQF8PEfWqfHXoI KXTw==
X-Gm-Message-State AOPr4FVW+iHAmBZ1p9qcdQKAlOqVIfBqIUD+CoP+kRrtpsdDrs0SL7s7D723rz/Poq1YBZZvY5mI7T8STOWkQQ==
X-Received by 10.50.26.169 with SMTP id m9mr15357591igg.68.1460561487816; Wed, 13 Apr 2016 08:31:27 -0700 (PDT)
In-Reply-To <874mb5twha.fsf@elektro.pacujo.net>
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.21
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive <http://mail.python.org/pipermail/python-list/>
List-Post <mailto:python-list@python.org>
List-Help <mailto:python-list-request@python.org?subject=help>
List-Subscribe <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
X-Mailman-Original-Message-ID <CALwzidmrOy9T=4N86F6eV3RdAP+TSAKUBXZKUA1wNk3RxAXTXw@mail.gmail.com>
X-Mailman-Original-References <387506b1-b645-4907-a45c-81a8c3043099@googlegroups.com> <CAPTjJmpuG=ew7FPwhdtsgDyjDc8d_T8-zbWuVxZy_sUUGj+R0Q@mail.gmail.com> <mailman.71.1460554158.15650.python-list@python.org> <874mb5twha.fsf@elektro.pacujo.net>
Xref csiph.com comp.lang.python:106949

Show key headers only | View raw

On Wed, Apr 13, 2016 at 8:27 AM, Marko Rauhamaa <marko@pacujo.net> wrote:
> Chris Angelico <rosuav@gmail.com>:
>
>> Let's just guess that you want to xor with the byte value 0xAA. We can
>> do that fairly simply, using integer operations.
>>
>>>>> data = b'$//W?\xc0\x829\xa2\xb9\x13\x8c\xd5{\\'
>>>>> bytes(b ^ 0xAA for b in data)
>> b'\x8e\x85\x85\xfd\x95j(\x93\x08\x13\xb9&\x7f\xd1\xf6'
>>
>> Well, that doesn't look much more intelligible.
>
> This looks clearer:
>
>    >>> code = b'a0\xed\xf0Z\x15]g^\xce3x'
>    >>> key = b')U\x81\x9c55*\x08,\xa2WY'
>    >>> bytes(c ^ k for c, k in zip(code, key)).decode()
>    'Hello world!'

But that's not the code from the OP's post. The solution is obviously this:

>>> code = b'$//W?\xc0\x829\xa2\xb9\x13\x8c\xd5{'
>>> key = b'm\x0fC8I\xa5\xa2i\xdb\xcd{\xe3\xbbZ'
>>> bytes(c ^ k for c, k in zip(code, key)).decode()
'I love Python!'

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

How to XOR a byte output? durgadevi1 <srirajarajeswaridevikrupa@gmail.com> - 2016-04-13 06:18 -0700
  Re: How to XOR a byte output? Chris Angelico <rosuav@gmail.com> - 2016-04-13 23:29 +1000
    Re: How to XOR a byte output? durgadevi1 <srirajarajeswaridevikrupa@gmail.com> - 2016-04-13 06:51 -0700
      Re: How to XOR a byte output? Chris Angelico <rosuav@gmail.com> - 2016-04-14 00:31 +1000
      Re: How to XOR a byte output? Stephen Hansen <me+python@ixokai.io> - 2016-04-13 08:33 -0700
    Re: How to XOR a byte output? Marko Rauhamaa <marko@pacujo.net> - 2016-04-13 17:27 +0300
      Re: How to XOR a byte output? Ian Kelly <ian.g.kelly@gmail.com> - 2016-04-13 09:30 -0600
      Re: How to XOR a byte output? durgadevi1 <srirajarajeswaridevikrupa@gmail.com> - 2016-04-14 01:49 -0700
        Re: How to XOR a byte output? Peter Otten <__peter__@web.de> - 2016-04-14 11:16 +0200
        Re: How to XOR a byte output? Marko Rauhamaa <marko@pacujo.net> - 2016-04-14 12:18 +0300
          Re: How to XOR a byte output? Chris Juried <cjuried@yahoo.com> - 2016-04-14 23:05 +0000
          Re: How to XOR a byte output? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-04-15 08:06 -0400
  Re: How to XOR a byte output? alister <alister.ware@ntlworld.com> - 2016-04-13 16:15 +0000
    [OT] A doubt about a doubt, was Re: How to XOR a byte output? Peter Otten <__peter__@web.de> - 2016-04-13 18:59 +0200
      Re: [OT] A doubt about a doubt, was Re: How to XOR a byte output? Rustom Mody <rustompmody@gmail.com> - 2016-04-13 18:54 -0700
        Re: [OT] A doubt about a doubt Peter Otten <__peter__@web.de> - 2016-04-14 14:26 +0200
  Re: How to XOR a byte output? durgadevi1 <srirajarajeswaridevikrupa@gmail.com> - 2016-04-14 01:32 -0700
  Re: How to XOR a byte output? durgadevi1 <srirajarajeswaridevikrupa@gmail.com> - 2016-04-15 04:46 -0700

csiph-web