CRC32反向哈希解密函数输出与输入哈希不匹配的修复求助（哈希e8b7be43对应明文'a'）

我现在正尝试把一个哈希值反向还原成对应的字节序列，下面是我写的解密函数：

def decrypt(hash, size):
    bytes = bin(int(hash, 16)).replace("0b", "").zfill(32)
    bytes = flip(reverse(int(bytes, 2), 32), 33)
    div = "100000100110000010001110110110111"
    bytes = bytes.zfill(size*8)
    div = div.zfill(size*8)
    res = ""
    print(bytes + " - DIV")
    print(div + " - POLY")
    while div[0] != "1":
        res = ""
        for b in range(len(bytes)):
            if div[b] == bytes[b]:
                res = res + "0"
            else:
                res = res + "1"
        bytes = bin(int(res, 2) << 1).replace("0b", "").zfill(size*8)
        div = bin(int(div, 2) << 1).replace("0b", "").zfill(size*8)
        print(bytes + " - DIV")
        print(div + " - POLY")
    print(bytes)
    bytes = flip(bytes[0:8], 8) + flip(bytes[8:16], 8) + flip(bytes[16:24], 8) + flip(bytes[24:32], 8) + bytes[32:len(bytes)]
    bytes = bytes[0:len(bytes)-32]
    bytes = [int(reverse(int(bytes[(c*8):(c+1)*8], 2), 8), 2) for c in range(int(len(bytes)/8))]
    print(hex(zlib.crc32(bytearray(bytes))))
    return bytes
print(decrypt(sys.argv[1], int(sys.argv[2])+4))

对应的运行输出如下：

>>>python encrypt.py a
40
0xe8b7be43
[97]

>>>python decrypt.py e8b7be43 1
0000000000111101100000100001001011101000 - DIV
0000000100000100110000010001110110110111 - POLY
0000001001110010100001100001111010111110 - DIV
0000001000001001100000100011101101101110 - POLY
0000000011110110000010000100101110100000 - DIV
0000010000010011000001000111011011011100 - POLY
0000100111001010000110000111101011111000 - DIV
0000100000100110000010001110110110111000 - POLY
0000001111011000001000010010111010000000 - DIV
0010000010011000001000111011011011100000 - POLY
0010011100101000011000011110101111100000 - DIV
0010000010011000001000111011011011100000 - POLY
0000111101100000100001001011101000000000 - DIV
0100000100110000010001110110110111000000 - POLY
1001110010100001100001111010111110000000 - DIV
1000001001100000100011101101101110000000 - POLY
1001110010100001100001111010111110000000
0xa0058808
[198]

现在遇到的问题是：解密函数生成的字节数组的CRC32哈希值和我输入的e8b7be43完全不匹配，请问我该怎么修复这个问题？

备注：内容来源于stack exchange，提问作者Nguyen Tran