# Generate keypair with password via stdin
openssl genrsa -aes128 -passout stdin > private.key

# Extract public key
openssl rsa -in private.key -pubout -out publickey.crt

# Encrypt a file using public key
openssl rsautl -encrypt -pubin -inkey publickey.crt -in data.txt | base64 > encrypted.txt

# Decrypt with password protected private key
cat encrypted.txt | base64 -d | openssl rsautl -decrypt -inkey private.key