Vendor the external cookbooks

Knife-Zero doesn't include Berkshelf support, so vendoring everything in
the repo is convenient again

cookbooks/openssl/resources/dhparam.rb

@@ -0,0 +1,48 @@
+#
+# Copyright:: Copyright 2009-2018, Chef Software Inc.
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+chef_version_for_provides '< 14.0' if respond_to?(:chef_version_for_provides)
+resource_name :openssl_dhparam
+
+include OpenSSLCookbook::Helpers
+
+property :path,        String, name_property: true
+property :key_length,  equal_to: [1024, 2048, 4096, 8192], default: 2048
+property :generator,   equal_to: [2, 5], default: 2
+property :owner,       String
+property :group,       String
+property :mode,        [Integer, String], default: '0640'
+
+action :create do
+  unless dhparam_pem_valid?(new_resource.path)
+    converge_by("Create a dhparam file #{new_resource.path}") do
+      dhparam_content = gen_dhparam(new_resource.key_length, new_resource.generator).to_pem
+
+      log "Generating #{new_resource.key_length} bit "\
+          "dhparam file at #{new_resource.path}, this may take some time"
+
+      file new_resource.path do
+        action :create
+        owner new_resource.owner unless new_resource.owner.nil?
+        group new_resource.group unless new_resource.group.nil?
+        mode new_resource.mode
+        sensitive true
+        content dhparam_content
+      end
+    end
+  end
+end