hex conversion in 64 bit python3

Asked Oct 18 '18 at 11:52

Active Oct 18 '18 at 11:52

Viewed 39 times

I'm trying to execute a sha1 length extension attack.

I'm stuck with the padding.

I have the length of the message, for example 257 bit, and, after converting in in hex is 0x101.

What I'd need is a 64 bit representation, so if the hex is `0x101', the correct format should be in python:

 '\x00\x00\x00\x00\x00\x00\x01\x01'

where each 8 bits are encoded in \x format.

Do you know how to implement this conversion in python3?

asked Oct 18 '18 at 11:52

stefano capra

2

Are you looking for something like `0x101.to_bytes(8, "big")`? What are the input and output types of the operation you're looking for? `int` to `bytes`? – Mark Dickinson Oct 18 '18 at 12:10
@MarkDickinson that's exactly what I was looking for. – stefano capra Oct 18 '18 at 12:28
@mkrieger1 you are right, this is the related question. I didn't found it because I didn't know how to formulate the problem properly. – stefano capra Oct 18 '18 at 12:29

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