#!/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}