背景：想给公司的进件流程写一套进件脚本，首先遇到的就是加密解密。公司用的 DES3 + base64 加密解密

一、安装  pycrypto模块，推荐用pycrypto编译文件，直接下载安装就行

http://www.voidspace.org.uk/python/modules.shtml#pycrypto

二、上代码，。此套代码是在 AES解密的基础上调整

#coding=utf-8

from Crypto.Cipher import _DES3 #加密解密方法

import base64

BS = _DES3.block_size

import json

import requests

def pad(s):

return s + (BS - len(s) % BS) * chr(BS - len(s) % BS)

#定义 padding 即 填充 为PKCS7

def unpad(s):

return s[0:-ord(s[-1])]

class prpcrypt():

def __init__(self, key):

self.key = key

self.mode = _DES3.MODE_CBC

self.iv = IV

# DES3的加密模式为CBC

def encrypt(self, text):

text = pad(text)

cryptor = _DES3.new(self.key, self.mode, self.iv)

#self.iv 为 IV 即偏移量

x = len(text) % 8

if x != 0:

text = text + '\0' * (8 - x) # 不满16，32，64位补0

# print(text)

self.ciphertext = cryptor.encrypt(text)

return base64.standard_b64encode(self.ciphertext).decode("utf-8")

def decrypt(self, text):

cryptor = _DES3.new(self.key, self.mode, self.iv)

de_text = base64.standard_b64decode(text)

plain_text = cryptor.decrypt(de_text)

# st = str(plain_text.decode("utf-8")).rstrip('\0')

# out = unpad(st)

# return out

#上面注释内容解密如果运行报错，就注释掉试试

return plain_text

if __name__ == '__main__':

iv = "******"　　　　#IV偏移量

pc = prpcrypt('******') # 自己设定的密钥

message = {"ARRAYDATA":

{"FACILITYID":"","FACILITYNAME":"","FACILITYTYPE":"","PASSWORD":"***","USERNO":"***"},

"TOKEN":"***",

}

js = json.dumps(message)　　　　#字典转str，再加密

print type(js)

e = pc.encrypt(js) # 加密内容

d = pc.decrypt(e) #解密内容

print e #加密后

print d #解密后

url = "***"

header = {"Content-Type":"application/x-www-form-urlencoded",

"Accept-Encoding": "gzip",

"User-Agent": "okhttp/3.8.0"}

message1 ={"message":e}

r = requests.post(url,headers=header,data=message1)

text1 = r.text

print text1

d1 = pc.decrypt(text1)

print d1

r = re.findall('\{(.+)\}',d1) #取值，对于返回值后面带有特殊字符，如空格、\等

d = eval("{"+r[0]+"}") #str转化成字典

token = d["ARRAYDATA"]["TOKEN"]　　#字典取值

print token