PlexSheep
/
plexcryptool
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases 1 Wiki Activity

finalizing

This commit is contained in:
Christoph J. Scherr 2023-04-22 10:42:29 +02:00
parent a1a5fc10b3
commit 613605c341
Signed by: PlexSheep
GPG Key ID: 25B4ACF7D88186CC
1 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/trash-hash.py
View File

@ -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 <software@cscherr.de>
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)))