https://gist.github.com/mtigas/952344

Create a Certificate Authority root (which represents this server)

Organization & Common Name: Some human identifier for this server CA.

openssl genrsa -des3 -out ca.key 4096

openssl req -new -x509 -days 365 -key ca.key -out ca.crt

Create the Client Key and CSR

Organization & Common Name = Person name

openssl genrsa -des3 -out client.key 4096

openssl req -new -key client.key -out client.csr

# self-signed

openssl x509 -req -days 365 -in client.csr -CA ca.crt -CAkey ca.key -set_serial 01 -out client.crt

Convert Client Key to PKCS so that it may be installed in most browsers.

openssl pkcs12 -export -clcerts -in client.crt -inkey client.key -out client.p12

Combines client.crt and client.key into a single PEM file for programs using openssl.

openssl pkcs12 -in client.p12 -out client.pem -clcerts