SSL Certificate Generator (self-signed, requires openssl). Add both generated key- and crt files to your web server. Add crt to your local keychain and/or browser.

gencert

#! /bin/sh

if [ "$1" == "" ]; then
    echo ""
    echo "SSL Certificate Generator (self-signed, requires openssl)."
    echo ""
    echo "  Usage:"
    echo ""
    echo "    gencert <days>   # Produces server.key and server.crt"
    echo ""
    exit 2
fi

echo "Generating self-signed SSL certificate, valid for $1 days."

openssl genrsa -des3 -passout pass:x -out server.pass.key 2048
openssl rsa -passin pass:x -in server.pass.key -out server.key
openssl req -new -key server.key -out server.csr
openssl x509 -req -sha256 -days $1 -in server.csr -signkey server.key -out server.crt
rm server.pass.key server.csr