sha256 hmac python3实现

import time
import hashlib
import hmac

def sha256_hmac(key,data):
    return hmac.new(key.encode('utf-8'), data.encode('utf-8'), digestmod=hashlib.sha256).hexdigest()

def sign(var,ak,sk,body):
    expiration = 1800
    sign_key_info = "{}/{}/{}/{}".format(var,ak,int(time.time()),expiration)
    sign_key = sha256_hmac(sk, sign_key_info)
    sing_result = sha256_hmac(sign_key, body)
    return "{}/{}".format(sign_key_info, sing_result)

var="1.0"
ak="abc"
sk="mimi"
body="this is body"

print(sign(var, ak, sk, body))