[ruby-core:53792] [ruby-trunk - Bug #8177] ext/openssl/pkcs7 signing fails with EC keys

Issue #8177 has been updated by Jacob640 (Joseph Coyle).


=begin
Hi Martin,

It's only a one liner aliasing public_key? to public? but I did it partly to check that nothing disastrous happened if that change were made.   

RE: the PKey interface I agree that the present situation does seem problematic.   Looking at the issues you have collected there it definitely seems like there are a lot of inconsistancies     One particular area I've experienced is the public key interface several methods assume that a public key will have the same class as private keys.   I particularly encountered this when writing a unit test for pkcs7 signing with EC keys after applying the patch above.   

The current pkcs7 unit tests dynamically construct x509 certificates from precomputed keys feeding the keys and desired attributes to a create_cert utility function in test/openssl/utils.rb.   However substituting in an EC key for an RSA/DSA key does not work because the function expects the response to key.public_key to conform to the PKey specification.   Particularly it expects that the output of key.public_key can be used as a valid argument to key.public_key= which is not true in the case of EC keys.   In order to create a working test the most expedient solution was to add an explicit test to the certificate issuing function.

This had the effect of changing this simple statement:
(({cert.public_key = key.public_key}))

To this:
...
(({
# EC keys need special handeling 
    case key.is_a?(OpenSSL::PKey::EC)
    when true
        ec_pub_key = OpenSSL::PKey::EC.new(key.group)
        ec_pub_key.public_key = key.public_key
        cert.public_key = ec_pub_key
    else
        cert.public_key = key.public_key
    end
end
}))

A branch containing a prototype test and the required alterations in the test utility function are available here: https://github.com/Jacob640/ruby/commit/afc1582a0000a021f4ee24d3cd3520f010f7f666

One aspect of the above code that particularly grates is the requirement for EC group parameter to be set before the public key info can be set.
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Bug #8177: ext/openssl/pkcs7 signing fails with EC keys
https://bugs.ruby-lang.org/issues/8177#change-37985

Author: Jacob640 (Joseph Coyle)
Status: Assigned
Priority: Normal
Assignee: MartinBosslet (Martin Bosslet)
Category: ext
Target version: current: 2.1.0
ruby -v: ruby 2.1.0dev (2013-03-27 trunk 39950) [x86_64-darwin11.4.2]


ext/openssl/pkcs7 signing fails with EC keys.   This happens because the EC keys do not respond to key.private? method which is used to check that the key is a private key.  Aliasing the instance method OpenSSL::PKey::EC.private_key? as OpenSSL::PKey::EC.private? fixes this problem and allows EC keys to be used for EC key signing.

This problem is demonstrated at https://gist.github.com/Jacob640/5239454

One potential fix which makes the key interface more consistent is here: https://github.com/ruby/ruby/pull/265

This request also improves the EC public key interface by producing a warning if the public key is set before setting an EC group as required.


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