ngx_borderpatrol/src/ssl/README.md

This folder contains self-signed SSL key and certs which will be used for local testing with your browser:

Generate new ones via (won't be needed though):

openssl genrsa -des3 -out server.key 1024
openssl req -new -key server.key -out server.csr
cp server.key server.key.org
openssl rsa -in server.key.org -out server.key
openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt

Additional details can be found here.