Note: First you will need a linux based operating system that supports openssl command to run the following commands.

1. Extract the key-pair
   #openssl pkcs12 -in sample.pfx -nocerts -nodes -out sample.key

2. Get the Private Key from the key-pair
   #openssl rsa -in sample.key -out sample_private.key

3. Get the Public Key from key pair
   #openssl rsa -in sample.key -pubout -out sample_public.key

4. Need to do some modification to the private key -> to pkcs8 format
   #openssl pkcs8 -topk8 -inform PEM -in sample_private.key -outform PEM -nocrypt
   Copy the output and save it as sample_private_pkcs8.key

5. Get those files
   public key: sample_public.key
   private key:  sample_private_pkcs8.key