validate_user () {
	user=$1
	pass=$2
	shadow_digest=$(/usr/bin/getent shadow "$user" | awk -F: '{print $2}')
	if [ -z "$shadow_digest" ]
	then
	      echo "Invalid user"
	      return
	fi
	salt=$(echo $shadow_digest|awk -F\$ '{print "$"$2"$"$3}')
	export USER_PASS=$pass 
	export PASS_SALT=$salt
	user_digest=$(perl -e 'print crypt($ENV{USER_PASS},$ENV{PASS_SALT})')
	echo $user_digest
	if [ "$user_digest" = "$shadow_digest" ]; then
	    echo "Password matched."
	else
	    echo "Password did not match"
	fi
}

validate_user 'USER' 'PASSWORD'