[ruby-core:78583] [Ruby trunk Bug#12348][Closed] PKey::EC.public_key returns EC::Point

Issue #12348 has been updated by Kazuki Yamaguchi.

Status changed from Assigned to Closed

There is an inconsistency with other OpenSSL::PKey classes in #public_key method. However I don't think it's worth breaking backwards compatibility in order to align the behavior with the other classes, as OpenSSL::PKey::{RSA,DSA,DH}#public_key are useless in normal use cases.


> NoMethodError: undefined method `private?' for #OpenSSL::PKey::EC:0x0000000453e388

This should have been fixed by r55098.

----------------------------------------
Bug #12348: PKey::EC.public_key returns EC::Point
https://bugs.ruby-lang.org/issues/12348#change-61970

* Author: Michael Richardson
* Status: Closed
* Priority: Normal
* Assignee: Kazuki Yamaguchi
* ruby -v: ruby 2.4.0dev (2016-04-27 openssl-110-v1 54798) [x86_64-linux]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
It appears that the EC subclass returns something isn't recognized as a public key (not a subclass of OpenSSL::PKey::PKey) when asked for its' public_key:

<pre>
ext-ruby-2.4-ssl :040 > key = OpenSSL::PKey::EC.new('X25519')
 => #<OpenSSL::PKey::EC:0x000000041cd988 @group=nil> 
ext-ruby-2.4-ssl :041 > key.generate_key
 => #<OpenSSL::PKey::EC:0x000000041cd988 @group=nil> 
ext-ruby-2.4-ssl :042 > key.public_key
 => #<OpenSSL::PKey::EC::Point:0x000000041c7f88 @group=#<OpenSSL::PKey::EC::Group:0x000000041c7fb0 @key=#<OpenSSL::PKey::EC:0x000000041cd988 @group=#<OpenSSL::PKey::EC::Group:0x000000041c7fb0 ...>>>> 
</pre>

The result can not be assigned as a certificate public key:

<pre>
ext-ruby-2.4-ssl :043 > root_ca  = OpenSSL::X509::Certificate.new
 => #<OpenSSL::X509::Certificate: subject=#<OpenSSL::X509::Name:0x000000041c2bc8>, issuer=#<OpenSSL::X509::Name:0x000000041c2bf0>, serial=#<OpenSSL::BN:0x000000041c2c18>, not_before=nil, not_after=nil> 
ext-ruby-2.4-ssl :044 > root_ca.public_key = key.public_key
TypeError: wrong argument (OpenSSL::PKey::EC::Point)! (Expected kind of OpenSSL::PKey::PKey)
</pre>

which is how I understand the RSA and DSA objects work (see: https://github.com/augustl/ruby-openssl-cheat-sheet/blob/master/certificate_authority.rb )

Assigning:
<pre>
ext-ruby-2.4-ssl :045 > root_ca.public_key = key           
 => #<OpenSSL::PKey::EC:0x000000041cd988 @group=#<OpenSSL::PKey::EC::Group:0x000000041c7fb0 @key=#<OpenSSL::PKey::EC:0x000000041cd988 ...>>> 
</pre>

is just fine.  However, later on, one runs into that:

NoMethodError: undefined method `private?' for #<OpenSSL::PKey::EC:0x0000000453e388>

which is more likely a bug in OpenSSL::X509::Certificate.

See #12324 for branch being used, also tested with 2.3.0, and using secp112r1 curve:

<pre>
2.3.0 :026 >     root_ca.sign(root_key, OpenSSL::Digest::SHA256.new)
NoMethodError: undefined method `private?' for #<OpenSSL::PKey::EC:0x0000000463f368>
</pre>

a simple monkey patch solved this issue, but reveals issues deeper in EVP which are unique to X25519.






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