any other linux destro can be used to generate private and public keys for pfSence Captive portal

# (Install compiling library Make)  

sudo apt-get install make 

# (Download the latest OpenSSL 1.0.2g binaries)  

wget https://www.openssl.org/source/openssl-1.0.2l.tar.gz 

# (Extract the tar ball to the local directory)  

tar -xzvf openssl-1.0.2l.tar.gz 

# (Enter extracted OpenSSL directory)  

cd openssl-1.0.2l 

#  (Configure binaries for compiling)  

./config

# (install configured binaries)  

make

cd apps

./openssl genrsa 31 > key.private

./openssl rsa -pubout key.public

cat key.private

cat key.public

Installing old openssl and then creating key less than 30