phc-discussions - Re: Suggestion: API should include a verifier function

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Date: Tue, 26 Mar 2013 20:08:28 -0700
From: Tony Arcieri <tony.arcieri@...il.com>
To: "discussions@...sword-hashing.net" <discussions@...sword-hashing.net>
Subject: Re: Suggestion: API should include a verifier function

On Tue, Mar 26, 2013 at 7:57 PM, Tony Arcieri <tony.arcieri@...il.com>wrote:

> you'd provide a user-supplied one as input, and verify via a guaranteed
> constant time comparison whether or not it's correct.
>

Oops, not quite what I meant to say there, but I'm sure you got the idea ;)

To clarify: you would pass in the hash/salt "on file" along with the
alleged password, and the function would return whether or not the provided
password matches the supplied hash/salt. The arguments are, otherwise, the
same as the hashing function.

As an API strawman, if this is our hashing function:

    PHS(out, outlen, in, inlen, salt, saltlen, t_cost, m_cost)

we might consider:

   PHS_VERIFY(hash, hashlen, in, inlen, salt, saltlen, t_cost, m_cost)

(I'm not particularly married to the name "PHS_VERIFY", so please bikeshed
away ;)

-- 
Tony Arcieri

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