Gem::Security::Policy#check_key

# File tmp/rubies/ruby-3.4.1/lib/rubygems/security/policy.rb, line 112
def check_key(signer, key)
  unless signer && key
    return true unless @only_signed

    raise Gem::Security::Exception, "missing key or signature"
  end

  raise Gem::Security::Exception,
    "certificate #{signer.subject} does not match the signing key" unless
      signer.check_private_key(key)

  true
end