将 Python 的 binascii.crc_hqx() 转换回 ascii

Question

我正在使用标准 Python3 库 binascii, and specifically the crc_hqx() 函数

binascii.crc_hqx(data, value)

Compute a 16-bit CRC value of data, starting with value as the initial CRC, and return the result. This uses the CRC-CCITT polynomial x16 + x12 + x5 + 1, often represented as 0x1021. This CRC is used in the binhex4 format.

我可以使用此代码转换为 CRC：

import binascii
t = 'abcd'
z = binascii.crc_hqx(t.encode('ascii'), 0)
print(t,z)

正如预期的那样，它打印了行

abcd 43062

但是我如何转换回 ASCII？

我尝试了 a2b_hqx() 函数的变体

binascii.a2b_hqx(string)

Convert binhex4 formatted ASCII data to binary, without doing RLE-decompression. The string should contain a complete number of binary bytes, or (in case of the last portion of the binhex4 data) have the remaining bits zero.

最简单的版本是：

y = binascii.a2b_hqx(str(z))

但我也尝试过 bytearray() and str.encode() 的变体，等等

对于此代码：

import binascii
t = 'abcd'
z = binascii.crc_hqx(t.encode('ascii'), 0)
print(t,z)
y = binascii.a2b_hqx(str(z))

回溯：

abcd 43062
Traceback (most recent call last):
  File "test.py", line 5, in <module>
    y = binascii.a2b_hqx(str(z))
binascii.Incomplete: String has incomplete number of bytes

并使用此代码：

y = binascii.a2b_hqx(bytearray(z))

这个回溯：

binascii.Error: Illegal char

Answer 1

生成的是校验和，无法转换回 ascii。

将 Python 的 binascii.crc_hqx() 转换回 ascii

Convert Python's binascii.crc_hqx() back to ascii

python

crc

crc16

binascii