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- # -*- coding: utf-8 -*-
- from __future__ import absolute_import, unicode_literals
- from library import to_binary, byte2int
- class PKCS7Encoder(object):
- block_size = 32
- @classmethod
- def encode(cls, text):
- length = len(text)
- padding_count = cls.block_size - length % cls.block_size
- if padding_count == 0:
- padding_count = cls.block_size
- padding = to_binary(chr(padding_count))
- return text + padding * padding_count
- @classmethod
- def decode(cls, decrypted):
- padding = byte2int(decrypted[-1])
- if padding < 1 or padding > 32:
- padding = 0
- return decrypted[:-padding]
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