284 lines
10 KiB
Python
284 lines
10 KiB
Python
#!/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 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 xml.etree.cElementTree as ET
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import sys
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import socket
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import ierror
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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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def getSHA1(self, token, timestamp, nonce, encrypt):
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try:
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# 确保所有输入都是字符串类型
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token = str(token)
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timestamp = str(timestamp)
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nonce = str(nonce)
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encrypt = str(encrypt)
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sortlist = [token, timestamp, nonce, encrypt]
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sortlist.sort()
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# 将列表转换为字符串并编码
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str_to_hash = "".join(sortlist).encode('utf-8')
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sha = hashlib.sha1()
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sha.update(str_to_hash)
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return ierror.WXBizMsgCrypt_OK, sha.hexdigest()
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except Exception as e:
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print(f"[ERROR] SHA1计算失败: {str(e)}")
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return ierror.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[%s]]></Encrypt>
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<MsgSignature><![CDATA[%s]]></MsgSignature>
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<TimeStamp>%s</TimeStamp>
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<Nonce><![CDATA[%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 ierror.WXBizMsgCrypt_OK, encrypt.text
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except Exception as e:
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print (e)
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return ierror.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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return self.AES_TEXT_RESPONSE_TEMPLATE % (
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encrypt,
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signature,
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timestamp,
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nonce
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)
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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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if isinstance(text, str):
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text = text.encode('utf-8')
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# 计算需要填充的位数
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amount_to_pad = self.block_size - (len(text) % 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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# 填充
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pad_chr = chr(amount_to_pad).encode('utf-8')
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padding = pad_chr * amount_to_pad
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return text + padding
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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(bytes类型)
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@return: 删除补位字符后的明文
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"""
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if isinstance(decrypted, bytes):
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pad = decrypted[-1]
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else:
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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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try:
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# 统一处理输入为bytes
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text = text.encode('utf-8') if isinstance(text, str) else text
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receiveid = receiveid.encode('utf-8') if isinstance(receiveid, str) else receiveid
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# 生成16位随机字符串
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random_str = self.get_random_str().encode('utf-8')
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# 打包文本长度
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text_len = struct.pack("I", socket.htonl(len(text)))
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# 拼接内容
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content = b''.join([random_str, text_len, text, receiveid])
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# PKCS7填充
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pkcs7 = PKCS7Encoder()
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padding_text = pkcs7.encode(content)
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# AES加密
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cryptor = AES.new(self.key, self.mode, self.key[:16])
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ciphertext = cryptor.encrypt(padding_text)
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# Base64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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print(f"[ERROR] 加密失败: {str(e)}")
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return ierror.WXBizMsgCrypt_EncryptAES_Error, None
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def decrypt(self,text,receiveid):
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try:
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cryptor = AES.new(self.key,self.mode,self.key[:16])
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plain_text = cryptor.decrypt(base64.b64decode(text))
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# 获取补位值
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pad = plain_text[-1]
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# 去除补位字符
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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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print(f"[ERROR] 解密失败: {str(e)}")
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return ierror.WXBizMsgCrypt_IllegalBuffer,None
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if from_receiveid != receiveid.encode('utf-8'):
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return ierror.WXBizMsgCrypt_ValidateCorpid_Error,None
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return 0,xml_content.decode('utf-8')
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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.ascii_letters + string.digits # 修改这里
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str = random.sample(rule, 16)
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return "".join(str)
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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 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，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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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.decode('utf-8'))
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if ret != 0:
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return ret, None
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xmlParse = XMLParse()
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return ret, xmlParse.generate(encrypt.decode('utf-8'), 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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xmlParse = XMLParse()
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ret,encrypt = xmlParse.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 ierror.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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