用于加密相关的操作，代替了md5模块和sha模块，主要提供SHA1,SHA224,SHA256,SHA512,MD5算法。
以下是算法示例：
1 #!/usr/bin/env python
2 # -*- coding:utf-8 -*-
3 import hashlib
4 #=================MD5()加密=====================
5 hhb = hashlib.md5(bytes("jahiuhfdakj", encoding='utf-8')) #加盐处理
6 ret = hhb.update(bytes("123", encoding='utf-8')) #“123”是需要加密的字符串
7 print("MD5加密:", hhb.hexdigest())
8
9
10 #=================SHA1()加密=====================
11 hhb = hashlib.sha1()
12 ret = hhb.update(bytes("123", encoding='utf-8'))
13 print("SHA1加密:", hhb.hexdigest())
14
15
16 #=================SHA224()加密=====================
17 hhb = hashlib.sha224()
18 ret = hhb.update(bytes("123", encoding='utf-8'))
19 print("SHA224加密:", hhb.hexdigest())
20
21 #=================SHA256()加密=====================
22 hhb = hashlib.sha256()
23 ret = hhb.update(bytes("123", encoding='utf-8'))
24 print("SHA256加密:", hhb.hexdigest())
25
26 #=================SHA512()加密=====================
27 hhb = hashlib.sha512()
28 ret = hhb.update(bytes("123", encoding='utf-8'))
29 print("SHA512加密:", hhb.hexdigest())
30
31 #=================SHA3_256()加密=====================
32 hhb = hashlib.sha3_256()
33 ret = hhb.update(bytes("123", encoding='utf-8'))
34 print("SHA3_256加密:", hhb.hexdigest())
35
36 #=================SHA3_384()加密=====================
37 hhb = hashlib.sha3_384()
38 ret = hhb.update(bytes("123", encoding='utf-8'))
39 print("SHA3_384加密:", hhb.hexdigest())
40
41 #=================SHA3_512()加密=====================
42 hhb = hashlib.sha3_512()
43 ret = hhb.update(bytes("123", encoding='utf-8'))
44 print("SHA3_512加密:", hhb.hexdigest())
算法示例的结果：
1 MD5加密: 113ccbcda570622489c183f6a6e0121e
2 SHA1加密: 40bd001563085fc35165329ea1ff5c5ecbdbbeef
3 SHA224加密: 78d8045d684abd2eece923758f3cd781489df3a48e1278982466017f
4 SHA256加密: a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3
5 SHA512加密: 3c9909afec25354d551dae21590bb26e38d53f2173b8d3dc3eee4c047e7ab1c1eb8b85103e3be7ba613b31bb5c9c36214dc9f14a42fd7a2fdb84856bca5c44c2
6 SHA3_256加密: a03ab19b866fc585b5cb1812a2f63ca861e7e7643ee5d43fd7106b623725fd67
7 SHA3_384加密: 9bd942d1678a25d029b114306f5e1dae49fe8abeeacd03cfab0f156aa2e363c988b1c12803d4a8c9ba38fdc873e5f007
8 SHA3_512加密: 48c8947f69c054a5caa934674ce8881d02bb18fb59d5a63eeaddff735b0e9801e87294783281ae49fc8287a0fd86779b27d7972d3e84f0fa0d826d7cb67dfefc
基于hashlib.md5()对密码进行加密实现用户登录验证的示例：
1 #!/usr/bin/env python
2 # -*- coding:utf-8 -*-
3
4 import hashlib
5 #基于MD5对密码进行加密实现用户登录验证
6
7 def md5(arg):
8 """
9 使用hashlib.md5()对密码进行加密处理
10 :param arg: 需要加密处理的密码
11 :return:
12 """
13 hash = hashlib.md5(bytes("我在学习python", encoding='utf-8')) #加盐，使用密码加密更有保障
14 hash.update(bytes(arg, encoding='utf-8'))
15 return hash.hexdigest()
16
17 def login(username, password):
18 """
19 用于用户登录验证
20 :param username: 用户名
21 :param password: 密码
22 :return: True,登录成功；False，登录失败。
23 """
24 with open("user.txt", "r", encoding="utf-8") as f:
25 for line in f:
26 line = line.strip() #默认strip无参数，会去掉首尾空格、换行符；有参数则去除指定值
27 line_list = line.split("|") #以|符号提取用户名和密码
28 if username == line_list[0] and md5(password) == line_list[1]:
29 return True
30 else:
31 return False
32
33 def register(username, password):
34 """
35 用户注册
36 :param username:用户名
37 :param password:密码
38 :return: True，注册成功
39 """
40 with open("user.txt", "a", encoding="utf-8") as f:
41 temp = "\n" + username + "|" + md5(password) # "\n"换行符
42 f.write(temp)
43 return True
44
45 def user_exsit(username):
46 """
47 注册时，判断用户名是否存在
48 :param username:用户名
49 :return:True, 用户名已存在
50 """
51 with open("user.txt", "r", encoding="utf-8") as f:
52 for line in f:
53 line = line.strip()
54 line_list = line.split("|")
55 if username == line_list[0]:
56 return True
57 return False
58
59 def main():
60 print("欢迎您使用本系统,请输入你进行操作选项。")
61 inp = input("1.登录；2.注册。请输入编号： ")
62 if inp == "1":
63 times = 1
64 while True:
65 if times == 4:
66 print("输入3次用户名或密码不正确，请在一小时后再重试。")
67 break
68 user = input("请输入你的用户名：")
69 pwd = input("请输入你的密码：")
70 is_login = login(user, pwd)
71 if is_login:
72 print("恭喜您！系统登录成功。")
73 break
74 else:
75 print("用户名或密码不正确。")
76 times += 1
77 if inp == "2":
78 user = input("请输入你的用户名：")
79 pwd = input("请输入你的密码：")
80 if user_exsit(user):
81 print("用户名已经存在，注册失败！")
82 else:
83 ret = register(user, pwd)
84 if ret:
85 print("注册成功！")
86 else:
87 print("注册失败！")
88
89 main()
加密后的user.txt的文件内容。
