
To generate a new key pair, run each of the followign commands 
and provide the same passphrase when prompted

openssl genrsa -des3 -out mykey.pem 2048
openssl rsa -in mykey.pem -outform PEM -pubout -out pkg_public.pem
openssl rsa -in mykey.pem -out pkg_private.pem -outform PEM 
rm mykey.pem

A quick experiment

cp README t1
openssl dgst -sha256 -sign pkg_private.pem -out sign.txt t1 
ls -l sign.txt 
openssl dgst -sha256 -verify pkg_public.pem -signature sign.txt t1

