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Date: Sun, 12 Sep 2021 14:01:09 +0200
From: magnum <john.magnum@...hmail.com>
To: john-users@...ts.openwall.com
Subject: Re: brute forcing AES key
On 2021-09-11 12:36, magnum wrote:
> On 2021-09-10 20:55, p+password@...atpro.net wrote:
>> Here are the info for the ETH vault:
>>
>> ETH vault coin name: ETH
>> ETH public key: 0x4ac97B48CbBF9D54AE1f07bF72b10F19eBE30BB1
>> ETH private key:
>> a5f54b647905db05a82d523fe0027a5da9760c2e97e4124448896f7333cdf96f
>> ETH seed: (left blank)
>> ETH vault comment: (left blank)
>
> Decrypted hex: 6b4b12535f595e(...)3934227d5d07070707070707
>
> As you can see we got expected padding this time: seven bytes of 07.
>
> Plaintext: kKS_Y^~Q]U
> udH","publicKey":"0x4ac97B48CbBF9D54AE1f07bF72b10F19eBE30BB1","privateKey":"a5f54b647905db05a82d523fe0027a5da9760c2e97e4124448896f7333cdf96f","seed":"","comment":"","id":"1631298033694"}]
>
>
> We could look for that constant string "publicKey" within, say, the
> first two blocks of AES. But I sort of think we can trust the padding as
> long as the vault isn't completely empty - it's faster than scanning.
>
>> thanks to 0 padding up to 32 chars, using password foobar in the app
>> GUI gives the same result as foobar0000, foobar0000000000,
>> foobar000000000000000, etc., this app is so nicely coded… :)
>
> Yes, I noticed the iv is also 16 x ASCII "0" as opposed to null bytes.
I was mistaken, it's null bytes - and that's why my plaintext had the
first block garbled.
> I now opened https://github.com/openwall/john/issues/4804 for
> implementing this format.
We now have formats ready to merge:
https://github.com/openwall/john/pull/4805. After realizing my mistake
with the iv, we now only need to decrypt the very first block and look
for the constant plaintext of '[{"coinName"' right at its start.
AES isn't very GPU-friendly so the OpenCL version "only" pushes about
380Mp/s on a 2080ti.
magnum
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