From: Martin Bosslet <Martin.Bosslet@...>
Date: 2011-07-27T10:45:13+09:00
Subject: [ruby-core:38545] [Ruby 1.9 - Feature #5103] [ext/openssl] Object equality for objects based on ASN.1 structures


Issue #5103 has been updated by Martin Bosslet.


Eric Hodel wrote:
> Is object equality on ASN.1 structures not useful or hard?

I think it could be quite useful, for example when comparing certificates. Right now an easy way to do this is by comparing cert1.to_der == cert2.to_der.
But still I would prefer the more intuitive cert1 == cert2 and implement it so that it actually compares the binary DER representation internally. This would be quite easy to implement since all ASN.1-based classes feature a to_der method already. 
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Feature #5103: [ext/openssl] Object equality for objects based on ASN.1 structures
http://redmine.ruby-lang.org/issues/5103

Author: Martin Bosslet
Status: Feedback
Priority: Normal
Assignee: Martin Bosslet
Category: ext
Target version: 1.9.4


Equality behaviour is not overridden by any of the classes that base on ASN.1 structures. This leads to
counterintuitive things such as

    require 'openssl'
    key = OpenSSL::PKey::RSA.new 256

    puts [key].include?(key) # => true

    key2 = OpenSSL::PKey.read key.to_pem

    puts key == key2 # => false
    puts [key].include?(key2) # => false

That's why I'd like to suggest to determine equality for these objects on the encoding level, i.e.
two such objects are equal iff obj1.to_der == obj2.to_der. 


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