I need to convert a string such as 5555555547aa into a string of characters (that one would be �GUUUU). I have a function working in python2 which is posted below, but I can't get anything to work right in python3. How would I do this?
def hex_conv(hex_str):
arr = [hex_str[i:i+2] for i in range(0, len(hex_str), 2)]
rev = arr[::-1]
out_str = ""
for i in rev:
print(i)
out_str += ("\\x" + i).decode("string_escape")
return out_str
More Clearly of what I need outputted (in Python2):
print('\xaa\x47\x55\x55\x55\x55')
I have tried
print(bytes.fromhex("5555555547aa")[::-1].decode("utf-8", errors="replace"))
which doesn't quite work. It appears to produce the same output but the actual bytes are different.
Note: The output of this is going to be piped into another program (for binary exploitation) so the bytes need to be printed exact.
You just need to combine 2 steps: convert from hex to a bytestring with bytes.fromhex, and to print a bytestring to stdout using sys.stdout.buffer.write. Putting it all together:
import sys
sys.stdout.buffer.write(bytes.fromhex("5555555547aa")[::-1])
Sourced from hexadecimal string to byte array in python and How to write a raw hex byte to stdout in Python 3?
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