import hashlib

def calc_md5(password):

     hash=hashlib.md5()

     hash.update(password.encode('utf-8'))

     return hash

def login(user, password):

    if user in db:

       hash=calc_md5(password)

       if hash.hexdigest()==db[user]:

           return True

       else:

           return  False

    else:

       return False

def login(username, password):

    user = db[username]

    password=password+user.salt

    return user.password == get_md5(password)