276 lines
10 KiB
Python
276 lines
10 KiB
Python
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#!/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) 1998-2020 Tencent Inc.
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"""
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# ------------------------------------------------------------------------
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import base64
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import string
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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 sys
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import socket
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import json
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reload(sys)
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import ierror
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sys.setdefaultencoding('utf-8')
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"""
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关于Crypto.Cipher模块，ImportError: No module named 'Crypto'解决方案
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请到官方网站 https://www.dlitz.net/software/pycrypto/ 下载pycrypto。
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下载后，按照README中的“Installation”小节的提示进行pycrypto安装。
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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))
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return ierror.WXBizMsgCrypt_OK, sha.hexdigest()
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except Exception,e:
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print e
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return ierror.WXBizMsgCrypt_ComputeSignature_Error, None
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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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# json消息模板
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AES_TEXT_RESPONSE_TEMPLATE = '''{
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"encrypt": "%(msg_encrypt)s",
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"msgsignature": "%(msg_signaturet)s",
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"timestamp": "%(timestamp)s",
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"nonce": "%(nonce)s"
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}'''
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def extract(self, jsontext):
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"""提取出json数据包中的加密消息
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@param jsontext: 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_dict = json.loads(jsontext)
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return ierror.WXBizMsgCrypt_OK, json_dict['encrypt']
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except Exception,e:
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print e
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return ierror.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 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json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_json = self.AES_TEXT_RESPONSE_TEMPLATE % resp_dict
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return resp_json
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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
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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 = self.get_random_str() + struct.pack("I",socket.htonl(len(text))) + text + receiveid
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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 ierror.WXBizMsgCrypt_OK, base64.b64encode(ciphertext)
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except Exception,e:
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print e
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return ierror.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,e:
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print e
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return ierror.WXBizMsgCrypt_DecryptAES_Error,None
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try:
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pad = ord(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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json_len = socket.ntohl(struct.unpack("I",content[ : 4])[0])
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json_content = content[4 : json_len+4]
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from_receiveid = content[json_len+4:]
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except Exception,e:
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print e
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return ierror.WXBizMsgCrypt_IllegalBuffer,None
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if from_receiveid != receiveid:
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print "receiveid not match"
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print from_receiveid
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return ierror.WXBizMsgCrypt_ValidateCorpid_Error,None
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return 0,json_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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rule = string.letters + string.digits
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str = random.sample(rule, 16)
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return "".join(str)
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class WXBizJsonMsgCrypt(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 ierror.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，json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json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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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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# json_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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print "signature not match"
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print signature
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return ierror.WXBizMsgCrypt_ValidateSignature_Error, None
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pc = Prpcrypt(self.key)
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ret,json_content = pc.decrypt(encrypt,self.m_sReceiveId)
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return ret,json_content
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