认证客户端的链接合法性

#服务端
from socket import *
import hmac,os
server = socket(AF_INET,SOCK_STREAM)
server.setsockopt(SOL_SOCKET,SO_REUSEADDR,1)
server.bind((‘127.0.0.1‘,9999))
server.listen(5)


secret_key = b‘chenxing‘  #密钥
def proving(conn):  #验证函数，
    print("开始验证")
    msg = os.urandom(32)  #随机生成加盐二进制字符
    conn.sendall(msg)   #将随机生成的盐发送给客户端
    local_secret = hmac.new(secret_key,msg)  #加盐摘要
    digest = local_secret.digest()  #获取摘要，返回的是二进制
    client_secret = conn.recv(len(digest))  #以本地密钥的长度为基准，截取匹配的字符串
    return  hmac.compare_digest(digest,client_secret)  #比较两个二进制是否相同
#此处将这个函数封装的非常好，在多出进行调用


def judge(conn):
    if not proving(conn):
        print("该链接不合法")
        conn.close()
        return
    print("该链接合法")
    while True:
        ret = conn.recv(1024)
        if not ret: break
        print(ret.decode(‘utf-8‘))
        conn.send(ret.upper())

if __name__ == "__main__":
    while True:
        conn,addr = server.accept()   #接受链接
        print("新连接【%s:%s】"%(addr[0],addr[1]))
        judge(conn)

from socket import *
import hmac
client = socket(AF_INET,SOCK_STREAM)
client.connect((‘127.0.0.1‘,9999))

secret_key = b‘chenxing‘
def poving():
    msg = client.recv(32)  #先取盐
    local_secret = hmac.new(secret_key,msg)
    disget = local_secret.digest()
    client.send(disget)  #将摘要发过去
poving()
while True:
    data = input(">>>").strip()
    if len(data) == 0:break
    client.send(data.encode(‘utf-8‘))
    ret = client.recv(1024)
    print(ret.decode(‘utf-8‘))
client.close()