Convert String From Big-endian To Little-endian Or Vice Versa In Python

I have a long string with hexadecimal characters. For example: string = 'AA55CC3301AA55CC330F234567' I am using the string.to_bytes(4, 'little') I would like the final string to

Solution 1:

to_bytes only works with integer, afaik.

You could use bytearray:

>>>ba = bytearray.fromhex("AA55CC3301AA55CC330F234567")>>>ba.reverse()

To convert it back to string using format:

>>>s = ''.join(format(x, '02x') for x in ba)>>>print(s.upper())
6745230F33CC55AA0133CC55AA

Solution 2:

Notice your question is very similar to this question from 2009 . While the old thread asks for one-way conversion, and you ask for a "vice-versa" conversion, it is really the same thing, whichever endianness you start with. Let me show,

0x12345678->0x78563412->0x12345678

The conversion is very easy with pwntools, the tools created for software hacking. In particular, to avoid packing-unpacking mess, pwntools embeds p32() function for exact this purpose

importpwntoolsx2= p32(x1)

Solution 3:

To convert between little and big-endian you can use this convert_hex function based on int.to_bytes and int.from_bytes:

defint2bytes(i, enc):
    return i.to_bytes((i.bit_length() + 7) // 8, enc)

defconvert_hex(str, enc1, enc2):
    return int2bytes(int.from_bytes(bytes.fromhex(str), enc1), enc2).hex()

be = "AA55CC3301AA55CC330F234567"
convert_hex(be, 'big', 'little')

Solution 4:

Is this the answer/code you are looking for?

def little(string):
 t= bytearray.fromhex(string)
 t.reverse()
 return ''.join(format(x,'02x') for x in t).upper()
little(s=AA55CC3301AA55CC330F234567)

Solution 5:

Maybe you can reverse string one of way would be

string = "AA55CC3301AA55CC330F234567"[::-1]