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221 lines
7.7 KiB
221 lines
7.7 KiB
3 years ago
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#!/usr/bin/env python
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# -*- coding:utf-8 -*-
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# project: 9月
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# author: NinEveN
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# date: 2021/9/6
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import base64
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import logging
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import string
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import random
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import struct
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import hashlib
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from Crypto.Cipher import AES
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import xml.etree.cElementTree as ET
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import time
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import socket
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from . import ierror
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logger = logging.getLogger(__name__)
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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_signature)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, xml_text):
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"""提取出xml数据包中的加密消息
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@param xml_text: 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(xml_text)
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encrypt = xml_tree.find("Encrypt")
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to_user_name = xml_tree.find("ToUserName")
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return ierror.WXBizMsgCrypt_OK, encrypt.text, to_user_name.text
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except Exception as e:
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logger.error(e)
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return ierror.WXBizMsgCrypt_ParseXml_Error, None, 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_signature': 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 PKCS7Encoder(object):
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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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def get_random_str():
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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.ascii_letters + string.digits
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return "".join(random.sample(rule, 16))
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class Prpcrypt(object):
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"""提供接收和推送给公众平台消息的加解密接口"""
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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, app_id):
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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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:param app_id: 应用id
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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 = get_random_str() + struct.pack("I", socket.htonl(len(text))).decode('utf-8') + text + app_id
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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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crypto = AES.new(self.key, self.mode, self.key[:16])
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try:
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ciphertext = crypto.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 as e:
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logger.error(e)
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return ierror.WXBizMsgCrypt_EncryptAES_Error, None
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def decrypt(self, text, app_id):
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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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:param app_id: 应用id
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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.error(e)
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return ierror.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_app_id = content[xml_len + 4:].decode('utf-8')
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except Exception as e:
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logger.error(e)
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return ierror.WXBizMsgCrypt_IllegalBuffer, None
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if from_app_id != app_id:
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return ierror.WXBizMsgCrypt_ValidateAppid_Error, None
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return 0, xml_content
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class WxMsgCryptBase(object):
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def __init__(self, app_id, app_secret, token, encoding_aes_key):
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try:
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self.key = base64.b64decode(encoding_aes_key + "=")
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assert len(self.key) == 32
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except Exception as e:
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logger.error(f"{encoding_aes_key} 解密失败 Exception:{e}")
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raise Exception("[error]: EncodingAESKey invalid !")
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self.token = token
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self.app_id = app_id
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def encrypt_msg(self, msg, nonce, timestamp=None):
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"""
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:param msg: 企业号待回复用户的消息，xml格式的字符串
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:param nonce: 随机串，可以自己生成，也可以用URL参数的nonce
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:param timestamp: 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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:return: 成功0，sEncryptMsg,失败返回对应的错误码None
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"""
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pc = Prpcrypt(self.key)
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ret, encrypt = pc.encrypt(msg, self.app_id)
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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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try:
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sha = hashlib.sha1(("".join(sorted([self.token, timestamp, nonce, encrypt]))).encode('utf-8'))
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return ret, XMLParse().generate(encrypt, sha.hexdigest(), timestamp, nonce)
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except Exception as e:
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logger.error(e)
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return ierror.WXBizMsgCrypt_ComputeSignature_Error, None
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def decrypt_msg(self, msg, msg_signature, timestamp, nonce):
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"""
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:param msg: 密文，对应POST请求的数据
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:param msg_signature: 签名串，对应URL参数的msg_signature
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:param timestamp: 时间戳，对应URL参数的timestamp
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:param nonce: 随机串，对应URL参数的nonce
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:return: 成功0，失败返回对应的错误码
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"""
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if isinstance(msg, str):
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ret, encrypt, _ = XMLParse().extract(msg)
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if ret != 0:
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return ret, None
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else:
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encrypt = msg.get('Encrypt')
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try:
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sha = hashlib.sha1(("".join(sorted([self.token, timestamp, nonce, encrypt]))).encode('utf-8'))
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if not sha.hexdigest() == msg_signature:
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return ierror.WXBizMsgCrypt_ValidateSignature_Error, None
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pc = Prpcrypt(self.key)
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ret, xml_content = pc.decrypt(encrypt, self.app_id)
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return ret, xml_content
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except Exception as e:
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logger.error(e)
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return ierror.WXBizMsgCrypt_ComputeSignature_Error, None
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