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/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..5432d5d
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,8 @@
+# SPDX-FileCopyrightText: © 2021 Open Networking Foundation <support@opennetworking.org>
+# SPDX-License-Identifier: Apache-2.0
+
+black~=19.10b0
+cryptography~=3.4.7
+python-jose~=3.3.0
+pylint~=2.7.2
+reuse~=0.11.1