Python实现的密码强度检测器示例

本文实例讲述了Python实现的密码强度检测器。分享给大家供大家参考，具体如下：

密码强度

密码强度如何量化呢？

一个密码可以有以下几种类型：长度、大写字母、小写字母、数字以及特殊符号。

显然，密码包含的特征越多、长度越长，其强度也就越高。

我们设置几个等级来评测密码强度，分别是：terrible, simple,
medium, strong。

不同的应用可能对密码强度的要求不一样，我们引入最小程度(min_length)和最小特征数(min_types)，作为可配置选项。

这样我们就可以检测密码包含的特征，特征与密码之间的关系可以简单定义为：

特征数	强度
小于最小长度	terrible
常用密码或规则的密码	simple
小于最小特征数	medium
大于或等于最小特征数	strong

另：常用的1万个密码点击此处本站下载。

代码实现

check.py

# coding: utf-8
"""
check
Check if your password safe
"""
import re
# 特征
NUMBER = re.compile(r'[0-9]')
LOWER_CASE = re.compile(r'[a-z]')
UPPER_CASE = re.compile(r'[A-Z]')
OTHERS = re.compile(r'[^0-9A-Za-z]')
def load_common_password():
 words = []
 with open("10k_most_common.txt", "r") as f:
  for word in f:
   words.append(word.strip())
 return words
COMMON_WORDS = load_common_password()
# 管理密码强度的类
class Strength(object):
 """
 密码强度三个属性：是否有效valid, 强度strength, 提示信息message
 """
 def __init__(self, valid, strength, message):
  self.valid = valid
  self.strength = strength
  self.message = message
 def __repr__(self):
  return self.strength
 def __str__(self):
  return self.message
 def __bool__(self):
  return self.valid
class Password(object):
 TERRIBLE = 0
 SIMPLE = 1
 MEDIUM = 2
 STRONG = 3
 @staticmethod
 def is_regular(input):
  regular = ''.join(['qwertyuiop', 'asdfghjkl', 'zxcvbnm'])
  return input in regular or input[::-1] in regular
 @staticmethod
 def is_by_step(input):
  delta = ord(input[1]) - ord(input[0])
  for i in range(2, len(input)):
   if ord(input[i]) - ord(input[i - 1]) != delta:
    return False
  return True
 @staticmethod
 def is_common(input):
  return input in COMMON_WORDS
 def __call__(self, input, min_length=6, min_type=3, level=STRONG):
  if len(input) < min_length:
   return Strength(False, "terrible", "密码太短了")
  if self.is_regular(input) or self.is_by_step(input):
   return Strength(False, "simple", "密码有规则")
  if self.is_common(input):
   return Strength(False, "simple", "密码很常见")
  types = 0
  if NUMBER.search(input):
   types += 1
  if LOWER_CASE.search(input):
   types += 1
  if UPPER_CASE.search(input):
   types += 1
  if OTHERS.search(input):
   types += 1
  if types < 2:
   return Strength(level <= self.SIMPLE, "simple", "密码太简单了")
  if types < min_type:
   return Strength(level <= self.MEDIUM, "medium", "密码还不够强")
  return Strength(True, "strong", "密码很强")
class Email(object):
 def __init__(self, email):
  self.email = email
 def is_valid_email(self):
  if re.match("^.+@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$", self.email):
   return True
  return False
 def get_email_type(self):
  types = ['qq', '163', 'gmail', '126', 'sina']
  email_type = re.search('@\w+', self.email).group()[1:]
  if email_type in types:
   return email_type
  return 'wrong email'
password = Password()

test_check.py: 用于单元测试

# coding: utf-8
"""
test for check
"""
import unittest
import check
class TestCheck(unittest.TestCase):
 def test_regular(self):
  rv = check.password("qwerty")
  self.assertTrue(repr(rv) == "simple")
  self.assertTrue('规则' in rv.message)
 def test_by_step(self):
  rv = check.password("abcdefg")
  self.assertTrue(repr(rv) == "simple")
  self.assertTrue('规则' in rv.message)
 def test_common(self):
  rv = check.password("password")
  self.assertTrue(repr(rv) == "simple")
  self.assertTrue('常见' in rv.message)
 def test_medium(self):
  rv = check.password("ahj01a")
  self.assertTrue(repr(rv) == 'medium')
  self.assertTrue('不够强' in rv.message)
 def test_strong(self):
  rv = check.password("asjka9AD")
  self.assertTrue(repr(rv) == 'strong')
  self.assertTrue('很强' in rv.message)
 # 测试邮箱
 def test_email(self):
  rv = check.Email("[e-mail]")
  self.assertEqual(rv.is_valid_email(), True)
 def test_email_type(self):
  rv = check.Email("[e-mail]")
  types = ['qq', '163', 'gmail', '126', 'sina']
  self.assertIn(rv.get_email_type(), types)
if __name__ == '__main__':
 unittest.main()