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Date: Fri, 14 Aug 2015 15:51:32 +0300
From: Solar Designer <>
Subject: Re: auditing our use of FMT_* flags

On Fri, Aug 14, 2015 at 10:55:06AM +0800, Kai Zhao wrote:
> Before strncmp(), we also should check the length of string returned
> by get_key() should not smaller than plaintext_min_length.
> So the length should between plaintext_min_length and plaintext_length,
> including.

Oh, plaintext_min_length is a jumbo addition that I wasn't even aware
of.  I guess it was added for WPA PSK.

I think the check you suggest would be fine, but not of much use.  For
those formats, all test vectors are probably of at least the minimum
length, so a shorter get_key() string would be detected through it being
different from what was provided.  And if there's a shorter test vector,
violating plaintext_min_length, then your check would detect it as an
error... but do we want that?  magnum?


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