From 613605c34123219948d783574cb9a603c63b9190 Mon Sep 17 00:00:00 2001 From: PlexSheep Date: Sat, 22 Apr 2023 10:42:29 +0200 Subject: [PATCH] finalizing --- src/trash-hash.py | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/src/trash-hash.py b/src/trash-hash.py index c700e17..a1c3423 100755 --- a/src/trash-hash.py +++ b/src/trash-hash.py @@ -1,6 +1,10 @@ #!/usr/bin/env python3 """ Dirty hash we were covered in an excercise for Week 16 of 2023 in cryptography + +author: Christoph J. Scherr +version control at: https://git.cscherr.de/PlexSheep/python-dhbw/src/branch/master/src/trash-hash.py +License: MIT """ import math import random @@ -65,11 +69,12 @@ def test_against_hash(input: bytearray, target_hash: bytearray) -> bool: # the hash we want to find in the preimage attacks # comes from 'AAAA' +#THE_HASH_ORIGIN = bytearray(b'AAAA') #THE_HASH = bytearray(b'\xe4\xe4\xe4\xe4\xa5\xa5\xa5\xa5\xaa\xaa\xaa\xaa\x55\x55\x55\x55') # any custom hash you want to find a collision for: # needs to be 16 bytes long # TODO fill with padding if not long enough -THE_HASH_ORIGIN = bytearray(b'amogus sus sus mogus more than 16 lol') +THE_HASH_ORIGIN = bytearray(b'1249239473289754927513214 21421 4124 214 21') THE_HASH = trash_hash(THE_HASH_ORIGIN) def first_preimage(): @@ -84,9 +89,9 @@ def first_preimage(): for i in range(0, 16): between[i] = THE_HASH[i] ^ DEFINED_INITIAL[i] - print("%d:\tbtw %s\ttar %s\thash %s\n\tini %s\tinp %s" % (i, between.hex(), target.hex(), THE_HASH.hex(), DEFINED_INITIAL.hex(), input.hex())) + #print("%d:\tbtw %s\ttar %s\thash %s\n\tini %s\tinp %s" % (i, between.hex(), target.hex(), THE_HASH.hex(), DEFINED_INITIAL.hex(), input.hex())) input[i] = target[i] ^ between[i] - print("%d:\tbtw %s\ttar %s\thash %s\n\tini %s\tinp %s" % (i, between.hex(), target.hex(), THE_HASH.hex(), DEFINED_INITIAL.hex(), input.hex())) + #print("%d:\tbtw %s\ttar %s\thash %s\n\tini %s\tinp %s" % (i, between.hex(), target.hex(), THE_HASH.hex(), DEFINED_INITIAL.hex(), input.hex())) assert THE_HASH[i] == DEFINED_INITIAL[i] ^ between[i], "xor circle is broken: %s vs %s" % (hex(THE_HASH[i]), hex(input[i] ^ between[i])) input: bytearray = bytearray(bytes(a ^ b for a, b in zip(input, target)))