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plexcryptool
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preimage attack progress

This commit is contained in:
Christoph J. Scherr 2023-04-22 01:05:00 +02:00
parent 188b077090
commit cd55bd1021
Signed by: PlexSheep
GPG Key ID: 25B4ACF7D88186CC
1 changed files with 6 additions and 4 deletions
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10
src/trash-hash.py
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@ -66,9 +66,7 @@ def test_against_hash(input: bytearray, target_hash: bytearray) -> bool:
def first_preimage():
print("Trying to find a message that produces %s" % THE_HASH.hex())
# a xor b = c
# c xor b = a
target = bytearray(b'\ff' * 16)
target = bytearray(b'\00' * 16)
input = bytearray(b'\00' * 16)
between = bytearray(16)
# this is an arbituary target
@ -76,8 +74,12 @@ def first_preimage():
target[0] = ord('A')
for i in range(0, 16):
between[i] = target[i] ^ THE_HASH[i]
between[i] = target[i] ^ DEFINED_INITIAL[i]
print("%d:\tbtw %s\ttar %s\thash %s" % (i, between.hex(), target.hex(), THE_HASH.hex()))
input[i] = between[i] ^ THE_HASH[i]
print("%d:\tbtw %s\ttar %s\thash %s" % (i, between.hex(), target.hex(), THE_HASH.hex()))
assert THE_HASH[i] == input[i] ^ target[i], "xor circle is broken"
print(test_against_hash(input, THE_HASH))