使用python和hashlib对unix/etc/shadow密码进行字典攻击？

可以这样做吗？我的测试似乎不起作用。我的明文密码是dictionary.txt，password.txt是/etc/shadow文件格式的密码。-我获取密码并使用hash.sha512（salt+plaintextpassword）对其进行散列。 然后将该散列与“cat/etc/shadow | grep user”的密码部分进行比较

import hashlib
import sys

def checkpass(passwd):
    try:
        semi_c = ':'
        d_sign = '$'
        pwdlist = passwd.split("$")
        salt = '$'+pwdlist[1]+'$'+pwdlist[2]+'$'
        print 'Salt is : ' + salt
        cryptPas = passwd.split(d_sign, 3)[3]
        cryptPass = cryptPas.split(semi_c)[0]
        print cryptPass 
        dictFile = open('dictionary.txt', 'r')

        for word in dictFile.readlines():

                word = word.strip('\n')
                print 'Comparing to pass in list : ' + word + ' to ' + passwd + ' ---- '
                cryptWord = hashlib.sha512(salt + word).hexdigest()
                print 'Reproduced Hash : ' + cryptWord
                if (cryptWord == cryptPass):
                    print '[+] Found Password : ' + word + '\n'
                    return cryptWord
                else:
                    print '[-] Password not found.\n'
                    return cryptWord

    except Exception, e:
        print e
    return  

def main():

    try:
        passfile = open('password.txt')
        passwd = passfile.readline()
        semi_c = ':'
        #print passwd
        if semi_c in passwd:
            user = passwd.split(semi_c)[0]
            print '[*] Cracking Password for : ' + user
            checkpass(passwd)
    except Exception, e:
        print e
    return    

if __name__ == '__main__':
        main() 

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我不知道Python的hashlib，但请注意crypt（）不仅是DES、MD5，而且只基于DES和MD5。例如，它使用了几轮。应该有一个Python加密模块