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Feature #12354

PKey::EC Can't output public key pem when private key exists

Added by armour (Armour Comms) about 4 years ago. Updated 12 months ago.

Status:
Assigned
Priority:
Normal
Target version:
-
[ruby-core:75387]

Description

Steps to reproduce:

Create EC key:

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

Try and output in pem format

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:

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

Output pem

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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