#!/bin/bash
 
    USERNAME=$1
    AUTHSTRING=00:00:00:00:00:00:00:00:00:00:00:66:74:69:2f
 
    for (( i=0; i<${#USERNAME}; i++ )); do
            HEXCHAR=$(echo -n ${USERNAME:$i:1} | od -An -txC | xargs)
            AUTHSTRING=${AUTHSTRING}:${HEXCHAR}
    done
    echo ${AUTHSTRING}