在 Python 3 中使用 UTF-8 解码 VIEWSTATE 字符串 [英] Decoding a VIEWSTATE string with UTF-8 in Python 3

问题描述

我在 Python 3 中解码 ASP.NET 视图状态字符串时遇到问题.当我尝试使用 bash 的 base64 命令解码字符串时，它成功解码字符串并且我能够看到我需要的所有信息(大部分是希伯来语，意思是 UTF-8).视图状态当然只是 base64 编码而不是加密.

I'm having trouble decoding a ASP.NET view state string in Python 3. When I try decoding the string using bash's base64 command, it decodes the string successfully and I'm able to see all the information I need (most of it is in Hebrew, meaning UTF-8). The view state is of course base64-encoded only and not encrypted.

但是，当我尝试使用 Python 的 base64 库对字符串进行解码，然后将字节数组解码为 UTF-8 字符串时，我收到一条错误消息:

However, when I try do decode the string using Python's base64 library and then decoding the byte array to a UTF-8 string, I get an error message:

UnicodeDecodeError: 'utf-8' 编解码器无法解码字节 0xff 的位置0:无效的起始字节

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte

我应该提到，由于字符串是一个视图状态，前几个字节是二进制数据，0xff"是有意义的，但是在这些字节之后，数据是可读的.

I should mention that since the string is a view state, the first few bytes are binary data and "0xff" makes sense, however after these bytes the data is readable.

Python 3 代码段:

Python 3 code segment:

b = "The_ViewState"
print(base64.b64decode(b).decode("utf-8"))

为什么解码在 bash 中工作而不是在 Python 中工作?如何解决?

Why does decoding work in bash and not in Python? How can this be resolved?

推荐答案

经过一番研究，我找到了答案:

After a little bit of research I found the answer:

b = "The_ViewState"
print(base64.b64decode(b).decode("utf-8", "ignore"))

添加忽略"标志会导致 decode() 丢弃任何无效的字节序列，从而将不相关的字节排除在解码字符串之外.

Adding the "ignore" flag causes decode() to discard any invalid byte sequences, thus leaving the irrelevant bytes out of the decoded string.

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