import hashlib

algs = [None, 'sha1', 'sha256', 'sha512']

def hash(algo, passwd):
	if algo == None: # None
		return passwd
	if algo == 'sha1': # sha1
		return sha1(passwd)
	if algo == 'sha256': # sha256
		return sha256(passwd)
	if algo == 'sha512': # sha512
		return sha512(passwd)
	return passwd

def sha1(passwd):
	return hashlib.sha1(passwd).hexdigest()

def sha256(passwd):
	return hashlib.sha256(passwd).hexdigest()

def sha512(passwd):
	return hashlib.sha512(passwd).hexdigest()