[ext/openssl] Object equality for objects based on ASN.1 structures
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.
Updated by MartinBosslet (Martin Bosslet) about 8 years ago
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.