make OpenSSL::PKey::EC::{Group,Point} directly wrap EC_{GROUP,POINT} object #71
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Make ossl_pkey_ec.c follow the general convension on macro names. Prefer CamelCase to Snake_Case and unify Require_*() and Get_*() macros into Get*() macros. There is nothing wrong with the style itself but it's hard to read if two different styles are mixed.
Currently an OpenSSL::PKey::EC::Point wraps an ossl_ec_point struct which has a pointer for EC_POINT. This commit make EC::Point wrap an EC_POINT directly in order to simplify the source code. There should be no changes on behavior seen from Ruby.
As done for EC::Point, remove ossl_ec_group struct. This contains a
breaking change. Modifications to an EC::Group returned by EC#group
no longer affects the EC object unless set to the key explicitly using
EC#group=. This is the common behavior in Ruby/OpenSSL, including other
getter methods of EC such as EC#public_key.
EC#group currently returns a EC::Group linked with the key, i.e. the
EC::Group object holds a reference to an EC_GROUP that the EC_KEY owns.
We use some ugly workaround - the ossl_ec_group struct has a flag
'dont_free' that indicates we must not free the EC_GROUP. But it is
still not possible to control OpenSSL of free'ing the EC_GROUP, so,
for example, the following code behaves strangely:
ec = OpenSSL::PKey::EC.generate("prime256v1")
group = ec.group
p group.curve_name #=> "prime256v1"
ec.group = OpenSSL::PKey::EC::Group.new("prime256v1")
p group.curve_name #=> nil
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