while read l; do
  [[ -n $l && ${l###} = $l ]] && ssh-keygen -l -f /dev/stdin <<<$l;
done < .ssh/authorized_keys

AUTHORIZED_FP=`while read l; do [[ -n $l && ${l###} = $l ]] && ssh-keygen -l -f /dev/stdin <<<$l; done < /home/centos/.ssh/authorized_keys 2>/dev/null | grep RSA`
sudo cat /var/log/secure |grep "Accepted publickey" | while read line; do
  AUDIT_MESSAGE=`echo $line | awk -F" " '{print $1 " " $2 " " $3 " from " $11 " FP: " $16}'`
  AUDIT_FP=`echo $AUDIT_MESSAGE | awk -F" " '{print $7}'`
  #echo "$AUDIT_FP"
  MATCHED=`printf "$AUTHORIZED_FP" | grep -n $AUDIT_FP`
  if [[ "$?" == "0" ]]; then
    KEY_LINE=`echo $MATCHED | awk -F":" '{print $1}'`
    KEY_USER=`echo $MATCHED | awk -F" " '{print $3}'`
    #echo $KEY_USER`
    echo "$AUDIT_MESSAGE User: $KEY_LINE $KEY_USER"
  fi
done