Skip to content
Navigation Menu
{{ message }}
forked from sbzhu/weworkapi_python
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathWXBizMsgCrypt.py
More file actions
280 lines (243 loc) · 10.1 KB
/
Copy pathWXBizMsgCrypt.py
File metadata and controls
280 lines (243 loc) · 10.1 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
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 = """<xml>
<Encrypt><![CDATA[%(msg_encrypt)s]]></Encrypt>
<MsgSignature><![CDATA[%(msg_signaturet)s]]></MsgSignature>
<TimeStamp>%(timestamp)s</TimeStamp>
<Nonce><![CDATA[%(nonce)s]]></Nonce>
</xml>"""
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
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
You can’t perform that action at this time.