OPENSSL CA

Selfsigned CA:
Steps
1) Create private key

openssl genrsa -aes128 -passout pass:foobar -out keys/privkey.pem 2048

2) Create public key

openssl req -new -x509 -days 1001 -key keys/privkey.pem -passin pass:foobar -out ca.cer <<EOF
>ES
>Spain
>Madrid
>Test
>Security
>AutoridadVal
>tt@none.es
>EOF

Script for data encryption with openssl

#!/bin/bash
export data=$2
openssl enc -blowfish -e -a -pass pass:$1 <<EOF
$data
EOF

Changing unix password with a script

This script is a test, use it at your own risk

#!/bin/bash
export pass=$1 
export user=$2
# we have assigned the data 
passwd $user << END
$pass
$pass
END