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# -*- coding: utf-8 -*- |
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from __future__ import absolute_import, unicode_literals |
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import struct |
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import socket |
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5
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import base64 |
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7
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from wechatpy.utils import to_text, to_binary, random_string, byte2int |
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8
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from wechatpy.crypto.pkcs7 import PKCS7Encoder |
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try: |
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from wechatpy.crypto.cryptography import WeChatCipher, AesEcbCipher |
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except ImportError: |
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12
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try: |
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from wechatpy.crypto.pycrypto import WeChatCipher, AesEcbCipher |
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except ImportError: |
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raise Exception('You must install either cryptography or pycryptodome!') |
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16
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17
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18
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class BasePrpCrypto(object): |
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20
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def __init__(self, key): |
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self.cipher = WeChatCipher(key) |
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def get_random_string(self): |
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return random_string(16) |
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def _encrypt(self, text, _id): |
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text = to_binary(text) |
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tmp_list = [] |
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tmp_list.append(to_binary(self.get_random_string())) |
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length = struct.pack(b'I', socket.htonl(len(text))) |
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tmp_list.append(length) |
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tmp_list.append(text) |
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tmp_list.append(to_binary(_id)) |
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34
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35
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text = b''.join(tmp_list) |
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text = PKCS7Encoder.encode(text) |
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38
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ciphertext = to_binary(self.cipher.encrypt(text)) |
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return base64.b64encode(ciphertext) |
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40
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41
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def _decrypt(self, text, _id, exception=None): |
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text = to_binary(text) |
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plain_text = self.cipher.decrypt(base64.b64decode(text)) |
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padding = byte2int(plain_text[-1]) |
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content = plain_text[16:-padding] |
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xml_length = socket.ntohl(struct.unpack(b'I', content[:4])[0]) |
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xml_content = to_text(content[4:xml_length + 4]) |
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from_id = to_text(content[xml_length + 4:]) |
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if from_id != _id: |
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exception = exception or Exception |
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raise exception() |
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return xml_content |
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53
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54
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55
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class BaseRefundCrypto(object): |
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56
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57
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def __init__(self, key): |
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58
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self.cipher = AesEcbCipher(key) |
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59
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60
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def _encrypt(self, text): |
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61
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text = to_binary(text) |
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text = PKCS7Encoder.encode(text) |
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63
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64
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ciphertext = to_binary(self.cipher.encrypt(text)) |
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return base64.b64encode(ciphertext) |
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66
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67
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def _decrypt(self, text, exception=None): |
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text = to_binary(text) |
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69
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plain_text = self.cipher.decrypt(base64.b64decode(text)) |
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70
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padding = byte2int(plain_text[-1]) |
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content = plain_text[:-padding] |
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return content |
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jxtech /
wechatpy
