1 files changed, 40 insertions, 0 deletions
diff --git a/lib/chef/mixin/openssl.rb b/lib/chef/mixin/openssl.rb
new file mode 100644
index 0000000000..a13e2c22af
--- /dev/null
+++ b/lib/chef/mixin/openssl.rb
@@ -0,0 +1,40 @@
+#
+# Copyright 2008-2017, Chef Software, Inc <legal@chef.io>
+#
+# 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.
+#
+# Ported from the homebrew cookbook's Homebrew::Mixin owner helpers
+#
+# This lives here in Chef::Mixin because Chef's namespacing makes it
+# awkward to use modules elsewhere (e.g., chef/provider/package/homebrew/owner)
+
+require "openssl"
+
+class Chef
+  module Mixin
+    module Openssl
+      # Validation helpers
+      def key_length_valid?(number)
+        number >= 1024 && number & (number - 1) == 0
+      end
+
+      def key_file_valid?(key_file_path, key_password = nil)
+        # Check if the key file exists
+        # Verify the key file contains a private key
+        return false unless ::File.exist?(key_file_path)
+        key = OpenSSL::PKey::RSA.new File.read(key_file_path), key_password
+        key.private?
+      end
+    end
+  end
+end