GNU bug report logs - #28942
base64 decoding issue

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Package: coreutils;

Reported by: Aaron Schneider <notstop2 <at> users.sourceforge.net>

Date: Sun, 22 Oct 2017 16:19:01 UTC

Severity: normal

Tags: notabug

Done: Assaf Gordon <assafgordon <at> gmail.com>

Bug is archived. No further changes may be made.

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Report forwarded to bug-coreutils <at> gnu.org:
bug#28942; Package coreutils. (Sun, 22 Oct 2017 16:19:01 GMT) Full text and rfc822 format available.

Acknowledgement sent to Aaron Schneider <notstop2 <at> users.sourceforge.net>:
New bug report received and forwarded. Copy sent to bug-coreutils <at> gnu.org. (Sun, 22 Oct 2017 16:19:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Aaron Schneider <notstop2 <at> users.sourceforge.net>
To: "bug-coreutils <at> gnu.org" <bug-coreutils <at> gnu.org>
Subject: base64 decoding issue
Date: Sun, 22 Oct 2017 16:13:01 +0000
Using this website as reference:
http://www.xinxinbtw.com/lm/url_kd/f9aadd61ca33fd1d0c47296140e88faf1f3dd2a2.html


I try to decode theĀ "thunder://" link to the "magnet://" link using base64.  For me, it adds 'AA' at the beginning (0x4141) which shouldn't be there.

* Website:
------
thunder://QUFtYWduZXQ6P3h0PXVybjpidGloOmY5YWFkZDYxY2EzM2ZkMWQwYzQ3Mjk2MTQwZTg4ZmFmMWYzZGQyYTJaWg==
------
magnet:?xt=urn:btih:f9aadd61ca33fd1d0c47296140e88faf1f3dd2a2


* My base64 (happens on all versions I've tried):
echo QUFtYWduZXQ6P3h0PXVybjpidGloOmY5YWFkZDYxY2EzM2ZkMWQwYzQ3Mjk2MTQwZTg4ZmFmMWYzZGQyYTJaWg== | base64 -d
AAmagnet:?xt=urn:btih:f9aadd61ca33fd1d0c47296140e88faf1f3dd2a2ZZ

Which one is the right? Is this a bug or the website is removing the AA intentionally? Note that there are extensions for web browsers that automatically change the link like:
+ https://addons.mozilla.org/en-US/firefox/addon/ease-link/
+ https://chrome.google.com/webstore/detail/pfgjjlnidkopfimlhcfcjhakhifbnmof




Information forwarded to bug-coreutils <at> gnu.org:
bug#28942; Package coreutils. (Tue, 30 Oct 2018 01:42:02 GMT) Full text and rfc822 format available.

Message #8 received at 28942 <at> debbugs.gnu.org (full text, mbox):

From: Assaf Gordon <assafgordon <at> gmail.com>
To: Aaron Schneider <notstop2 <at> users.sourceforge.net>, 28942 <at> debbugs.gnu.org
Subject: Re: bug#28942: base64 decoding issue
Date: Mon, 29 Oct 2018 19:40:57 -0600
tags 28942 notabug
close 28942
stop

(triaging old bugs)

On 2017-10-22 10:13 a.m., Aaron Schneider wrote:
 I try to decode theĀ "thunder://" link to the "magnet://" link using 
base64.  For me, it adds 'AA' at the beginning (0x4141) which shouldn't 
be there.
> 
> * Website:
> ------
> thunder://QUFtYWduZXQ6P3h0PXVybjpidGloOmY5YWFkZDYxY2EzM2ZkMWQwYzQ3Mjk2MTQwZTg4ZmFmMWYzZGQyYTJaWg==
> ------
> magnet:?xt=urn:btih:f9aadd61ca33fd1d0c47296140e88faf1f3dd2a2
> 
> 
> * My base64 (happens on all versions I've tried):
> echo QUFtYWduZXQ6P3h0PXVybjpidGloOmY5YWFkZDYxY2EzM2ZkMWQwYzQ3Mjk2MTQwZTg4ZmFmMWYzZGQyYTJaWg== | base64 -d
> AAmagnet:?xt=urn:btih:f9aadd61ca33fd1d0c47296140e88faf1f3dd2a2ZZ
> 

It seems your message was lost and not replied to in a eyar.
Sorry about that.

If you try to encode the "magnet://" string to base64,
you'll get:

$ echo "magnet:?xt=urn:btih:f9aadd61ca33fd1d0c47296140e88faf1f3dd2a2" \
   | base64 -w0 ; echo
bWFnbmV0Oj94dD11cm46YnRpaDpmOWFhZGQ2MWNhMzNmZDFkMGM0NzI5NjE0MGU4OGZhZjFmM2RkMmEyCg==

Which means your encoded string (the one starting with "QUF") is
not identical to the encoded "magnet://" string.


As such, I'm closing this bug.
If this is still an issue, discussion can continue by replying to this 
thread.

-assaf





Added tag(s) notabug. Request was from Assaf Gordon <assafgordon <at> gmail.com> to control <at> debbugs.gnu.org. (Tue, 30 Oct 2018 01:42:02 GMT) Full text and rfc822 format available.

bug closed, send any further explanations to 28942 <at> debbugs.gnu.org and Aaron Schneider <notstop2 <at> users.sourceforge.net> Request was from Assaf Gordon <assafgordon <at> gmail.com> to control <at> debbugs.gnu.org. (Tue, 30 Oct 2018 01:42:02 GMT) Full text and rfc822 format available.

bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Tue, 27 Nov 2018 12:24:08 GMT) Full text and rfc822 format available.

This bug report was last modified 5 years and 124 days ago.

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