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Message-ID: <BLU0-SMTP391603D5B7687FD2314F709FDFE0@phx.gbl>
Date: Wed, 20 Jun 2012 18:50:39 +0200
From: Frank Dittrich <frank_dittrich@...mail.com>
To: john-dev@...ts.openwall.com
Subject: Re: handling different BINARY_SIZE values in a single
format
On 06/20/2012 06:43 PM, Dhiru Kholia wrote:
> Hi,
>
> EPiServer format can crack both SHA1 and SHA256 hashes. However, the
> BINARY_SIZE for both these types is different. How can I handle this
> situation in cmp_* functions?
>
> Currently, I have the following code which is valid for only SHA1 hashes.
>
> static int cmp_one(void *binary, int index)
> {
> return !memcmp(binary, crypt_out[index], 20); /* BUG: lesser
> of the two */
> }
This should work OK if you change cmp_exact from just returning 1 to
doing a real check.
Otherwise, how high is the risk of collisions (resulting in false
positives) if you just compare 20 bytes?
Frank
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