From 125e624c0aafdd87fe19330c8c6b2ac56b4ce560 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E9=99=88=E7=84=B0?= Date: Wed, 3 Apr 2019 18:28:10 +0800 Subject: [PATCH] =?UTF-8?q?python3=20=E9=80=82=E9=85=8D?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 1. print、except 语法 2. string 和 binary string， 各种decode --- callback/WXBizMsgCrypt3.py | 280 +++++++++++++++++++++++++++++++++++++ 1 file changed, 280 insertions(+) create mode 100644 callback/WXBizMsgCrypt3.py diff --git a/callback/WXBizMsgCrypt3.py b/callback/WXBizMsgCrypt3.py new file mode 100644 index 0000000..c0256dd --- /dev/null +++ b/callback/WXBizMsgCrypt3.py @@ -0,0 +1,280 @@ +#!/usr/bin/env python +# -*- encoding:utf-8 -*- + +""" 对企业微信发送给企业后台的消息加解密示例代码. +@copyright: Copyright (c) 1998-2014 Tencent Inc. + +""" +# ------------------------------------------------------------------------ +import logging +import base64 +import random +import hashlib +import time +import struct +from Crypto.Cipher import AES +import xml.etree.cElementTree as ET +import socket + +import ierror + + +""" +关于Crypto.Cipher模块，ImportError: No module named 'Crypto'解决方案 +请到官方网站 https://www.dlitz.net/software/pycrypto/ 下载pycrypto。 +下载后，按照README中的“Installation”小节的提示进行pycrypto安装。 +""" + + +class FormatException(Exception): + pass + + +def throw_exception(message, exception_class=FormatException): + """my define raise exception function""" + raise exception_class(message) + + +class SHA1: + """计算企业微信的消息签名接口""" + + def getSHA1(self, token, timestamp, nonce, encrypt): + """用SHA1算法生成安全签名 + @param token: 票据 + @param timestamp: 时间戳 + @param encrypt: 密文 + @param nonce: 随机字符串 + @return: 安全签名 + """ + try: + sortlist = [token, timestamp, nonce, encrypt] + sortlist.sort() + sha = hashlib.sha1() + sha.update("".join(sortlist).encode()) + return ierror.WXBizMsgCrypt_OK, sha.hexdigest() + except Exception as e: + logger = logging.getLogger() + logger.error(e) + return ierror.WXBizMsgCrypt_ComputeSignature_Error, None + + +class XMLParse: + """提供提取消息格式中的密文及生成回复消息格式的接口""" + + # xml消息模板 + AES_TEXT_RESPONSE_TEMPLATE = """ + + +%(timestamp)s + +""" + + def extract(self, xmltext): + """提取出xml数据包中的加密消息 + @param xmltext: 待提取的xml字符串 + @return: 提取出的加密消息字符串 + """ + try: + xml_tree = ET.fromstring(xmltext) + encrypt = xml_tree.find("Encrypt") + return ierror.WXBizMsgCrypt_OK, encrypt.text + except Exception as e: + logger = logging.getLogger() + logger.error(e) + return ierror.WXBizMsgCrypt_ParseXml_Error, None, None + + def generate(self, encrypt, signature, timestamp, nonce): + """生成xml消息 + @param encrypt: 加密后的消息密文 + @param signature: 安全签名 + @param timestamp: 时间戳 + @param nonce: 随机字符串 + @return: 生成的xml字符串 + """ + resp_dict = { + 'msg_encrypt': encrypt, + 'msg_signaturet': signature, + 'timestamp': timestamp, + 'nonce': nonce, + } + resp_xml = self.AES_TEXT_RESPONSE_TEMPLATE % resp_dict + return resp_xml + + +class PKCS7Encoder(): + """提供基于PKCS7算法的加解密接口""" + + block_size = 32 + + def encode(self, text): + """ 对需要加密的明文进行填充补位 + @param text: 需要进行填充补位操作的明文 + @return: 补齐明文字符串 + """ + text_length = len(text) + # 计算需要填充的位数 + amount_to_pad = self.block_size - (text_length % self.block_size) + if amount_to_pad == 0: + amount_to_pad = self.block_size + # 获得补位所用的字符 + pad = chr(amount_to_pad) + return text + (pad * amount_to_pad).encode() + + def decode(self, decrypted): + """删除解密后明文的补位字符 + @param decrypted: 解密后的明文 + @return: 删除补位字符后的明文 + """ + pad = ord(decrypted[-1]) + if pad < 1 or pad > 32: + pad = 0 + return decrypted[:-pad] + + +class Prpcrypt(object): + """提供接收和推送给企业微信消息的加解密接口""" + + def __init__(self, key): + + # self.key = base64.b64decode(key+"=") + self.key = key + # 设置加解密模式为AES的CBC模式 + self.mode = AES.MODE_CBC + + def encrypt(self, text, receiveid): + """对明文进行加密 + @param text: 需要加密的明文 + @return: 加密得到的字符串 + """ + # 16位随机字符串添加到明文开头 + text = text.encode() + text = self.get_random_str() + struct.pack("I", socket.htonl(len(text))) + text + receiveid.encode() + + # 使用自定义的填充方式对明文进行补位填充 + pkcs7 = PKCS7Encoder() + text = pkcs7.encode(text) + # 加密 + cryptor = AES.new(self.key, self.mode, self.key[:16]) + try: + ciphertext = cryptor.encrypt(text) + # 使用BASE64对加密后的字符串进行编码 + return ierror.WXBizMsgCrypt_OK, base64.b64encode(ciphertext) + except Exception as e: + logger = logging.getLogger() + logger.error(e) + return ierror.WXBizMsgCrypt_EncryptAES_Error, None + + def decrypt(self, text, receiveid): + """对解密后的明文进行补位删除 + @param text: 密文 + @return: 删除填充补位后的明文 + """ + try: + cryptor = AES.new(self.key, self.mode, self.key[:16]) + # 使用BASE64对密文进行解码，然后AES-CBC解密 + plain_text = cryptor.decrypt(base64.b64decode(text)) + except Exception as e: + logger = logging.getLogger() + logger.error(e) + return ierror.WXBizMsgCrypt_DecryptAES_Error, None + try: + pad = plain_text[-1] + # 去掉补位字符串 + # pkcs7 = PKCS7Encoder() + # plain_text = pkcs7.encode(plain_text) + # 去除16位随机字符串 + content = plain_text[16:-pad] + xml_len = socket.ntohl(struct.unpack("I", content[: 4])[0]) + xml_content = content[4: xml_len + 4] + from_receiveid = content[xml_len + 4:] + except Exception as e: + logger = logging.getLogger() + logger.error(e) + return ierror.WXBizMsgCrypt_IllegalBuffer, None + + if from_receiveid.decode('utf8') != receiveid: + return ierror.WXBizMsgCrypt_ValidateCorpid_Error, None + return 0, xml_content + + def get_random_str(self): + """ 随机生成16位字符串 + @return: 16位字符串 + """ + return str(random.randint(1000000000000000, 9999999999999999)).encode() + + +class WXBizMsgCrypt(object): + # 构造函数 + def __init__(self, sToken, sEncodingAESKey, sReceiveId): + try: + self.key = base64.b64decode(sEncodingAESKey + "=") + assert len(self.key) == 32 + except: + throw_exception("[error]: EncodingAESKey unvalid !", FormatException) + # return ierror.WXBizMsgCrypt_IllegalAesKey,None + self.m_sToken = sToken + self.m_sReceiveId = sReceiveId + + # 验证URL + # @param sMsgSignature: 签名串，对应URL参数的msg_signature + # @param sTimeStamp: 时间戳，对应URL参数的timestamp + # @param sNonce: 随机串，对应URL参数的nonce + # @param sEchoStr: 随机串，对应URL参数的echostr + # @param sReplyEchoStr: 解密之后的echostr，当return返回0时有效 + # @return：成功0，失败返回对应的错误码 + + def VerifyURL(self, sMsgSignature, sTimeStamp, sNonce, sEchoStr): + sha1 = SHA1() + ret, signature = sha1.getSHA1(self.m_sToken, sTimeStamp, sNonce, sEchoStr) + if ret != 0: + return ret, None + if not signature == sMsgSignature: + return ierror.WXBizMsgCrypt_ValidateSignature_Error, None + pc = Prpcrypt(self.key) + ret, sReplyEchoStr = pc.decrypt(sEchoStr, self.m_sReceiveId) + return ret, sReplyEchoStr + + def EncryptMsg(self, sReplyMsg, sNonce, timestamp=None): + # 将企业回复用户的消息加密打包 + # @param sReplyMsg: 企业号待回复用户的消息，xml格式的字符串 + # @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 + # @param sNonce: 随机串，可以自己生成，也可以用URL参数的nonce + # 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, + # return：成功0，sEncryptMsg,失败返回对应的错误码None + pc = Prpcrypt(self.key) + ret, encrypt = pc.encrypt(sReplyMsg, self.m_sReceiveId) + encrypt = encrypt.decode('utf8') + if ret != 0: + return ret, None + if timestamp is None: + timestamp = str(int(time.time())) + # 生成安全签名 + sha1 = SHA1() + ret, signature = sha1.getSHA1(self.m_sToken, timestamp, sNonce, encrypt) + if ret != 0: + return ret, None + xmlParse = XMLParse() + return ret, xmlParse.generate(encrypt, signature, timestamp, sNonce) + + def DecryptMsg(self, sPostData, sMsgSignature, sTimeStamp, sNonce): + # 检验消息的真实性，并且获取解密后的明文 + # @param sMsgSignature: 签名串，对应URL参数的msg_signature + # @param sTimeStamp: 时间戳，对应URL参数的timestamp + # @param sNonce: 随机串，对应URL参数的nonce + # @param sPostData: 密文，对应POST请求的数据 + # xml_content: 解密后的原文，当return返回0时有效 + # @return: 成功0，失败返回对应的错误码 + # 验证安全签名 + xmlParse = XMLParse() + ret, encrypt = xmlParse.extract(sPostData) + if ret != 0: + return ret, None + sha1 = SHA1() + ret, signature = sha1.getSHA1(self.m_sToken, sTimeStamp, sNonce, encrypt) + if ret != 0: + return ret, None + if not signature == sMsgSignature: + return ierror.WXBizMsgCrypt_ValidateSignature_Error, None + pc = Prpcrypt(self.key) + ret, xml_content = pc.decrypt(encrypt, self.m_sReceiveId) + return ret, xml_content