import sys
import crypt
''' Compute the same password hash that Linux does
	Author: Tim Pierson, Dartmouth CS55, Winter 2021

	based example from Du: Computer and Internet Security pg 507

	python3 make_linux_passwords.py 'dees' '$6$wDRrWCQz'
		will output the same linux hash as seed in /etc/shadow
		to confirm type sudo cat /etc/shadow
'''

if __name__ == '__main__':
	if len(sys.argv) != 3:
		print(sys.argv)
		print("Got",len(sys.argv),"arguments, expecting three")
		print("Usage: python3 make_linux_passwords.py <password> <salt>")
	else:
		pwd = sys.argv[1] #'dees'
		salt = sys.argv[2] #'$6$wDRrWCQz'
		print(crypt.crypt(pwd,salt)) #does 5,000 rounds of SHA512