一、hashlib包介绍

1. hashlib常用的加密方法

以上列表中的方法，从上到下加密后，可以破解的概率越小，破解的难度越高。

2.例子

import hashlib
import time

base_sign = 'Jg'


def custom():
    # python的时间戳是一个浮点类型的
    a_timestamp = int(time.time())
    _token = '%s%s' % (base_sign, a_timestamp)

    hashobj = hashlib.sha1(_token.encode('utf-8'))
    a_token = hashobj.hexdigest()
    return a_token, a_timestamp


def b_service_check(token, timestamp):
    _token = '%s%s' % (base_sign, timestamp)
    b_token = hashlib.sha1(_token.encode('utf-8')).hexdigest()
    if token == b_token:
        return True
    else:
        return False


if __name__ == '__main__':
    need_help_token, timestamp = custom()
    time.sleep(1)
    result = b_service_check(need_help_token, int(time.time()))

    if result == True:
        print('a合法，b服务可以进行帮助')
    else:
        print('a不合法，b不可进行帮助')

3. base64包的常用方法

4.例子

import base64

replace_one = '%'
replace_two = '$'


def encode(data):
    if isinstance(data, str):
        data = data.encode('utf-8')
    elif isinstance(data, bytes):
        data = data
    else:
        raise TypeError('data need bytes or str')

    _data = base64.encodebytes(data).decode('utf-8')
    _data = _data.replace('a', replace_one).replace('=', replace_two)
    return _data


def decode(data):
    if not isinstance(data, bytes):
        raise TypeError('data need bytes')

    replace_one_b = replace_one.encode('utf-8')
    replace_two_b = replace_two.encode('utf-8')
    data = data.replace(replace_one_b, b'a').replace(replace_two_b, b'=')
    return base64.decodebytes(data).decode('utf-8')


if __name__ == '__main__':
    result = encode('hello xu')
    print(result)
    new_result = decode(result.encode('utf-8'))
    print(new_result)