#--coding:utf-8---
# Author: subk
# Time  : 2018/12/12 22:06
# Desc  : 

"""
1. 都用的小写字母
2. & 0xffffffff是为了得到正数
    如 binascii.crc32(‘haha’)
"""

import itertools
import binascii

alph = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/='

def crc32_dec_2(crc32):  
    x = itertools.product(alph, repeat=2)       #repeat 确定生成的组合里有几个字符
    for i in x:
        zuhe=''.join(i)
        if str(hex(binascii.crc32(zuhe) & 0xffffffff)[2:10]) == crc32.lower():
            return zuhe

def crc32_dec_3(crc32):  
    x = itertools.product(alph, repeat=3)       #repeat 确定生成的组合里有几个字符
    for i in x:
        zuhe=''.join(i)
        if str(hex(binascii.crc32(zuhe) & 0xffffffff)[2:10]) == crc32.lower():
            return zuhe

def crc32_dec_5(crc32):  #需要的时间可能比较长
    x = itertools.product(alph, repeat=5)       #repeat 确定生成的组合里有几个字符
    for i in x:
        zuhe=''.join(i)
        if str(hex(binascii.crc32(zuhe) & 0xffffffff)[2:10]) == crc32.lower():
            return zuhe

print crc32_dec_5('c46bbddc')   #需要爆破的crc32值