[ruby-core:109885] [Ruby master Feature#12354] PKey::EC Can't output public key pem when private key exists

Issue #12354 has been updated by rhenium (Kazuki Yamaguchi).

Status changed from Assigned to Closed

openssl v2.2 added OpenSSL::PKey::PKey#public_to_pem and #public_to_der for this purpose.

https://github.com/ruby/openssl/pull/297

Ruby 3.0 includes v2.2 by default.

----------------------------------------
Feature #12354: PKey::EC Can't output public key pem when private key exists
https://bugs.ruby-lang.org/issues/12354#change-99126

* Author: armour (Armour Comms)
* Status: Closed
* Priority: Normal
* Assignee: rhenium (Kazuki Yamaguchi)
----------------------------------------
Steps to reproduce:

Create EC key:

```ruby
key = OpenSSL::PKey::EC.new("prime256v1")
key.generate_key
```

Try and output in pem format

```ruby
key.to_pem #Outputs private key pem
key.public_key.to_pem #Error
```

In order to output a public key pem, a new key object must be created with no private key:

```ruby
key_pub = OpenSSL::PKey::EC.new(key.group)
key_pub.public_key = key.public_key
```

Output pem

```ruby
key_pub.to_pem #Success!
```

From viewing the source, http://rxr.whitequark.org/mri/source/ext/openssl/ossl_pkey_ec.c#466 it seems that if the key is private there is no way to output a public key for that key object



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