#!/usr/bin/env python
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# -*- encoding:utf-8 -*-
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""" 对企业微信发送给企业后台的消息加解密示例代码.
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@copyright: Copyright (c) 1998-2014 Tencent Inc.
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"""
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# ------------------------------------------------------------------------
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import logging
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import base64
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import random
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import hashlib
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import time
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import struct
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from Crypto.Cipher import AES
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import xml.etree.cElementTree as ET
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import socket
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import json
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WXBizMsgCrypt_OK = 0
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WXBizMsgCrypt_ValidateSignature_Error = -40001
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WXBizMsgCrypt_ParseXml_Error = -40002
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WXBizMsgCrypt_ComputeSignature_Error = -40003
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WXBizMsgCrypt_IllegalAesKey = -40004
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WXBizMsgCrypt_ValidateCorpid_Error = -40005
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WXBizMsgCrypt_EncryptAES_Error = -40006
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WXBizMsgCrypt_DecryptAES_Error = -40007
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WXBizMsgCrypt_IllegalBuffer = -40008
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WXBizMsgCrypt_EncodeBase64_Error = -40009
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WXBizMsgCrypt_DecodeBase64_Error = -40010
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WXBizMsgCrypt_GenReturnXml_Error = -40011
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WXBizMsgCrypt_ParseJson_Error = -40012
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"""
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Crypto.Cipher包已不再维护，开发者可以通过以下命令下载安装最新版的加解密工具包
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pip install pycryptodome
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"""
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class FormatException(Exception):
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pass
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def throw_exception(message, exception_class=FormatException):
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"""my define raise exception function"""
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raise exception_class(message)
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class SHA1:
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"""计算企业微信的消息签名接口"""
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def getSHA1(self, token, timestamp, nonce, encrypt):
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"""用SHA1算法生成安全签名
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@param token: 票据
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@param timestamp: 时间戳
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@param encrypt: 密文
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@param nonce: 随机字符串
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@return: 安全签名
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"""
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try:
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sortlist = [token, timestamp, nonce, encrypt]
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sortlist.sort()
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sha = hashlib.sha1()
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sha.update("".join(sortlist).encode())
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return WXBizMsgCrypt_OK, sha.hexdigest()
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except Exception as e:
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logger = logging.getLogger()
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logger.error(e)
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return WXBizMsgCrypt_ComputeSignature_Error, None
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class XMLParse:
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"""提供提取消息格式中的密文及生成回复消息格式的接口"""
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# xml消息模板
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AES_TEXT_RESPONSE_TEMPLATE = """<xml>
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<Encrypt><![CDATA[%(msg_encrypt)s]]></Encrypt>
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<MsgSignature><![CDATA[%(msg_signaturet)s]]></MsgSignature>
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<TimeStamp>%(timestamp)s</TimeStamp>
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<Nonce><![CDATA[%(nonce)s]]></Nonce>
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</xml>"""
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def extract(self, xmltext):
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"""提取出xml数据包中的加密消息
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@param xmltext: 待提取的xml字符串
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@return: 提取出的加密消息字符串
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"""
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try:
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xml_tree = ET.fromstring(xmltext)
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encrypt = xml_tree.find("Encrypt")
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return WXBizMsgCrypt_OK, encrypt.text
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except Exception as e:
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logger = logging.getLogger()
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logger.error(e)
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return WXBizMsgCrypt_ParseXml_Error, None
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def generate(self, encrypt, signature, timestamp, nonce):
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"""生成xml消息
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@param encrypt: 加密后的消息密文
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@param signature: 安全签名
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@param timestamp: 时间戳
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@param nonce: 随机字符串
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@return: 生成的xml字符串
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"""
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resp_dict = {
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'msg_encrypt': encrypt,
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'msg_signaturet': signature,
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'timestamp': timestamp,
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'nonce': nonce,
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}
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resp_xml = self.AES_TEXT_RESPONSE_TEMPLATE % resp_dict
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return resp_xml
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class JsonParse:
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"""提供提取消息格式中的密文及生成回复消息格式的接口"""
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def extract(self, json_data_str):
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"""提取出json数据包中的加密消息
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@param json_data_str: 待提取的json字符串
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@return: 提取出的加密消息字符串
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"""
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try:
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json_data_dict = json.loads(json_data_str)
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encrypt = json_data_dict['encrypt']
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return WXBizMsgCrypt_OK, encrypt
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except Exception as e:
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logger = logging.getLogger()
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logger.error(e)
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return WXBizMsgCrypt_ParseJson_Error, None
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def generate(self, encrypt, signature, timestamp, nonce):
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"""生成json消息
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@param encrypt: 加密后的消息密文
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@param msgsignature: 安全签名
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@param timestamp: 时间戳
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@param nonce: 随机字符串
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@return: 生成的json字符串
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"""
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resp_dict = {
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'encrypt': encrypt,
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'msgsignature': signature,
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'timestamp': timestamp,
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'nonce': nonce,
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}
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return resp_dict
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class PKCS7Encoder():
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"""提供基于PKCS7算法的加解密接口"""
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block_size = 32
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def encode(self, text):
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""" 对需要加密的明文进行填充补位
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@param text: 需要进行填充补位操作的明文
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@return: 补齐明文字符串
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"""
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text_length = len(text)
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# 计算需要填充的位数
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amount_to_pad = self.block_size - (text_length % self.block_size)
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if amount_to_pad == 0:
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amount_to_pad = self.block_size
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# 获得补位所用的字符
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pad = chr(amount_to_pad)
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return text + (pad * amount_to_pad).encode()
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def decode(self, decrypted):
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"""删除解密后明文的补位字符
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@param decrypted: 解密后的明文
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@return: 删除补位字符后的明文
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"""
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pad = ord(decrypted[-1])
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if pad < 1 or pad > 32:
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pad = 0
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return decrypted[:-pad]
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class Prpcrypt(object):
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"""提供接收和推送给企业微信消息的加解密接口"""
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def __init__(self, key):
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# self.key = base64.b64decode(key+"=")
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self.key = key
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# 设置加解密模式为AES的CBC模式
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self.mode = AES.MODE_CBC
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def encrypt(self, text, receiveid):
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"""对明文进行加密
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@param text: 需要加密的明文
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@return: 加密得到的字符串
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"""
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# 16位随机字符串添加到明文开头
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text = text.encode()
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text = self.get_random_str() + struct.pack("I", socket.htonl(len(text))) + text + receiveid.encode()
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# 使用自定义的填充方式对明文进行补位填充
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pkcs7 = PKCS7Encoder()
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text = pkcs7.encode(text)
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# 加密
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cryptor = AES.new(self.key, self.mode, self.key[:16])
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try:
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ciphertext = cryptor.encrypt(text)
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# 使用BASE64对加密后的字符串进行编码
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return WXBizMsgCrypt_OK, base64.b64encode(ciphertext)
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except Exception as e:
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logger = logging.getLogger()
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logger.error(e)
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return WXBizMsgCrypt_EncryptAES_Error, None
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def decrypt(self, text, receiveid):
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"""对解密后的明文进行补位删除
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@param text: 密文
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@return: 删除填充补位后的明文
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"""
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try:
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cryptor = AES.new(self.key, self.mode, self.key[:16])
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# 使用BASE64对密文进行解码，然后AES-CBC解密
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plain_text = cryptor.decrypt(base64.b64decode(text))
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except Exception as e:
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logger = logging.getLogger()
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logger.error(e)
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return WXBizMsgCrypt_DecryptAES_Error, None
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try:
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pad = plain_text[-1]
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# 去掉补位字符串
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# pkcs7 = PKCS7Encoder()
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# plain_text = pkcs7.encode(plain_text)
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# 去除16位随机字符串
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content = plain_text[16:-pad]
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xml_len = socket.ntohl(struct.unpack("I", content[: 4])[0])
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xml_content = content[4: xml_len + 4]
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from_receiveid = content[xml_len + 4:]
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except Exception as e:
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logger = logging.getLogger()
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logger.error(e)
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return WXBizMsgCrypt_IllegalBuffer, None
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if from_receiveid.decode('utf8') != receiveid:
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return WXBizMsgCrypt_ValidateCorpid_Error, None
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return 0, xml_content
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def get_random_str(self):
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""" 随机生成16位字符串
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@return: 16位字符串
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"""
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return str(random.randint(1000000000000000, 9999999999999999)).encode()
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class WXBizMsgCrypt(object):
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# 构造函数
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def __init__(self, sToken, sEncodingAESKey, sReceiveId):
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try:
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self.key = base64.b64decode(sEncodingAESKey + "=")
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assert len(self.key) == 32
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except:
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throw_exception("[error]: EncodingAESKey unvalid !", FormatException)
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# return ierror.WXBizMsgCrypt_IllegalAesKey,None
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self.m_sToken = sToken
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self.m_sReceiveId = sReceiveId
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# 验证URL
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# @param sMsgSignature: 签名串，对应URL参数的msg_signature
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# @param sTimeStamp: 时间戳，对应URL参数的timestamp
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# @param sNonce: 随机串，对应URL参数的nonce
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# @param sEchoStr: 随机串，对应URL参数的echostr
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# @param sReplyEchoStr: 解密之后的echostr，当return返回0时有效
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# @return：成功0，失败返回对应的错误码
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def VerifyURL(self, sMsgSignature, sTimeStamp, sNonce, sEchoStr):
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sha1 = SHA1()
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ret, signature = sha1.getSHA1(self.m_sToken, sTimeStamp, sNonce, sEchoStr)
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if ret != 0:
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return ret, None
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if not signature == sMsgSignature:
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return WXBizMsgCrypt_ValidateSignature_Error, None
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pc = Prpcrypt(self.key)
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ret, sReplyEchoStr = pc.decrypt(sEchoStr, self.m_sReceiveId)
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return ret, sReplyEchoStr
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def EncryptMsg(self, sReplyMsg, sNonce, timestamp=None):
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# 将企业回复用户的消息加密打包
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# @param sReplyMsg: 企业号待回复用户的消息，xml格式的字符串
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# @param sTimeStamp: 时间戳，可以自己生成，也可以用URL参数的timestamp,如为None则自动用当前时间
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# @param sNonce: 随机串，可以自己生成，也可以用URL参数的nonce
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# sEncryptMsg: 加密后的可以直接回复用户的密文，包括msg_signature, timestamp, nonce, encrypt的xml格式的字符串,
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# return：成功0，sEncryptMsg,失败返回对应的错误码None
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pc = Prpcrypt(self.key)
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ret, encrypt = pc.encrypt(sReplyMsg, self.m_sReceiveId)
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encrypt = encrypt.decode('utf8')
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if ret != 0:
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return ret, None
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if timestamp is None:
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timestamp = str(int(time.time()))
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# 生成安全签名
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sha1 = SHA1()
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ret, signature = sha1.getSHA1(self.m_sToken, timestamp, sNonce, encrypt)
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if ret != 0:
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return ret, None
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jsonParse = JsonParse()
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return ret, jsonParse.generate(encrypt, signature, timestamp, sNonce)
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def DecryptMsg(self, sPostData, sMsgSignature, sTimeStamp, sNonce):
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# 检验消息的真实性，并且获取解密后的明文
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# @param sMsgSignature: 签名串，对应URL参数的msg_signature
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# @param sTimeStamp: 时间戳，对应URL参数的timestamp
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# @param sNonce: 随机串，对应URL参数的nonce
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# @param sPostData: 密文，对应POST请求的数据
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# xml_content: 解密后的原文，当return返回0时有效
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# @return: 成功0，失败返回对应的错误码
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# 验证安全签名
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jsonParse = JsonParse()
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ret, encrypt = jsonParse.extract(sPostData)
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if ret != 0:
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return ret, None
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sha1 = SHA1()
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ret, signature = sha1.getSHA1(self.m_sToken, sTimeStamp, sNonce, encrypt)
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if ret != 0:
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return ret, None
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if not signature == sMsgSignature:
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return WXBizMsgCrypt_ValidateSignature_Error, None
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pc = Prpcrypt(self.key)
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ret, xml_content = pc.decrypt(encrypt, self.m_sReceiveId)
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return ret, xml_content
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