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Re: gc-pbkdf2-sha1
From: |
Bruno Haible |
Subject: |
Re: gc-pbkdf2-sha1 |
Date: |
Wed, 12 Oct 2005 18:54:49 +0200 |
User-agent: |
KMail/1.5 |
Simon Josefsson wrote:
> Perhaps for clarity we could change it into:
>
> #define CEIL_DIV(a,b) (((a) - 1) / (b)) + 1
> l = CEIL_DIV (dkLen, hLen);
>
> What do you think?
People could be tempted to borrow this formula and apply to situations where
it doesn't fit.
Normally one uses
#define CEIL(a,b) (((a) + (b) - 1) / (b))
but not here, because here
- this formula could yield overflow,
- it is known that dkLen > 0.
> Neither of the first two approaches is really trivial to understand
> what they mean
The comment already explains it:
l = CEIL (dkLen / hLen) ,
But you are free to add more comments, of course.
Bruno