Initial commit

- cpisign.py
   - initial work and logic by Wei-Yu
   - converted to use python cryptography (stable API) instead of
      OpenSSL by Zack)
- Basic lint, license tests

Change-Id: I05e9c0fbce339fc3bd187120174dcfde0299852f
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..3241d3d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,55 @@
+# SPDX-FileCopyrightText: © 2021 Open Networking Foundation <support@opennetworking.org>
+# SPDX-License-Identifier: Apache-2.0
+
+# Use bash for pushd/popd, and to fail quickly.
+# No -u as virtualenv activate script has undefined vars
+SHELL = bash -e -o pipefail
+
+.DEFAULT_GOAL := help
+.PHONY: test lint pylint black blacken license help
+
+PYTHON_FILES      ?= $(wildcard *.py)
+
+# tooling
+VIRTUALENV        ?= python3 -m venv
+
+# Create the virtualenv with all the tools installed
+VENV_NAME = venv_cbrs
+
+$(VENV_NAME): requirements.txt
+	$(VIRTUALENV) $@ ;\
+  source ./$@/bin/activate ; set -u ;\
+  python -m pip install --upgrade pip;\
+  python -m pip install -r requirements.txt
+	echo "To enter virtualenv, run 'source $@/bin/activate'"
+
+test: black pylint license ## run tests
+
+pylint: $(VENV_NAME) ## pylint check for best practices
+	source ./$</bin/activate ; set -u ;\
+  pylint --version ;\
+  pylint $(PYTHON_FILES)
+
+black: $(VENV_NAME) ## run black on python files in check mode
+	source ./$</bin/activate ; set -u ;\
+  black --version ;\
+  black --check $(PYTHON_FILES)
+
+blacken: $(VENV_NAME) ## run black on python files to reformat
+	source ./$</bin/activate ; set -u ;\
+  black --version ;\
+  black $(PYTHON_FILES)
+
+license: $(VENV_NAME) ## Check license with the reuse tool
+	source ./$</bin/activate ; set -u ;\
+  reuse --version ;\
+  reuse --root . lint
+
+clean:
+	rm -rf $(VENV_NAME)
+
+help: ## Print help for each target
+	@echo cbrstools make targets
+	@echo
+	@grep '^[[:alnum:]_-]*:.* ##' $(MAKEFILE_LIST) \
+    | sort | awk 'BEGIN {FS=":.* ## "}; {printf "%-25s %s\n", $$1, $$2};'