From: ruby gem <lists@...>
Date: 2012-05-08T13:45:33+09:00
Subject: Re: proper way to create truly new dup/cloned object?

okay -w doesn't show any warning about this so it isn't that. I have 
also observed that .xor! with dup works as expected in some cases. Here 
is an example showing where it works as expected

require 'xor'
require 'openssl'

@a = "aaaaaaa"
b = @a.dup
puts @a
puts b
b.xor!("bbbbbbb")
puts @a
puts b

#outputs

aaaaaaa
aaaaaaa
aaaaaaa


however, here is what I have simplified my script that I need to work to


require 'xor'
require 'openssl'

@sha256 = OpenSSL::Digest::SHA256.new
@l = @sha256.digest("whatever")
@sha256.reset
cloned_l = @l.dup
subkey = @sha256.digest("whatever2")

puts @l
puts cloned_l

cloned_l.xor!(subkey)

puts @l
puts cloned_l

#outputs

�s��2�Y���%�\m  �C�"�O
�s��2�Y���%�\m  �C�"�O
XA'pP�
       �7B�,��vd��,]|R>�f
XA'pP�
       �7B�,��vd��,]|R>�f


I am absolutely lost on why it is not working correctly here because it 
seems to be the same exact pattern to me?! Can anyone see what is going 
wrong?

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