Encrypt.py

#!/usr/bin/env python
# _*_ coding:utf-8 _*_

# @Author: Merack
# @Email: merack@qq.com

import rsa


# 用Python实现的no Padding 方式的RSA加密(因为校园网的js中的RSA加密用就是no Padding模式,而Python中的RSA库没有这个模式,真坑 -_-)
# 来源: https://www.cnblogs.com/pythonClub/p/10464745.html
class Encrypt(object):
    def __init__(self, e, m):
        self.e = e
        self.m = m

    def encrypt(self, message):
        mm = int(self.m, 16)
        ee = int(self.e, 16)
        rsa_pubkey = rsa.PublicKey(mm, ee)
        crypto = self._encrypt(message.encode(), rsa_pubkey)
        return crypto.hex()

    def _pad_for_encryption(self, message, target_length):
        message = message[::-1]
        max_msglength = target_length - 11
        msglength = len(message)

        padding = b''
        padding_length = target_length - msglength - 3

        for i in range(padding_length):
            padding += b'\x00'

        return b''.join([b'\x00\x00', padding, b'\x00', message])

    def _encrypt(self, message, pub_key):
        keylength = rsa.common.byte_size(pub_key.n)
        padded = self._pad_for_encryption(message, keylength)

        payload = rsa.transform.bytes2int(padded)
        encrypted = rsa.core.encrypt_int(payload, pub_key.e, pub_key.n)
        block = rsa.transform.int2bytes(encrypted, keylength)

        return block