2021-10-09

#登陆密码验证，MD5编码存储密码法（加盐和username，其实也可以生成一个随机数，这样更难猜测）
import hashlib

class User(object):
    def __init__(self,username,passward):
        self.username=username
        self.passward=register(username,passward)
#调用get_md5（），返回加username和盐的MD5码
def register(username,password):
    return get_md5(password+username+'the-Salt')
#返回MD5码
def get_md5(s):
    md5=hashlib.md5()
    md5.update(s.encode('utf-8'))
    return md5.hexdigest()
#存储已有的username和password
db={'Bob':User('Bob','123'),'Lily':User('Lily','456')}
#登录
def login(username,password):
    #为了抛出username不存在的错误
    try:
        loginer=register(username,password)
        user=db[username]
        #登录成功
        if loginer==user.passward:
            print("Login succeeded")
        #失败
        else:
            print("Password or Username error")
    except:
        print("user does not exist")

username=input("please write your name:")
password=input("please write your password:")
login(username,password)

#登陆密码验证，MD5编码存储密码法（加盐和username，也可以生成一个随机数，这样更难猜测）
import hashlib,hmac

class User(object):
    def __init__(self,username,passward):
        self.username=username
        self.passward=register(username,passward)

def register(username,password):
    #new()中的参数得是bytes格式
    username=username.encode('utf-8')
    password=password.encode('utf-8')
    h=hmac.new(username,password,digestmod='MD5')
    return h.hexdigest()

db={'Bob':User('Bob','123'),'Lily':User('Lily','456')}
#登录
def login(username,password):
    #为了抛出username不存在的错误
    try:
        loginer=register(username,password)
        user=db[username]
        #登录成功
        if loginer==user.passward:
            print("Login succeeded")
        #失败
        else:
            print("Password or Username error")
    except:
        print("user does not exist")

username=input("please write your name:")
password=input("please write your password:")
login(username,password)