netdev - Re: Doing crypto in small stack buffers (bluetooth vs vmalloc-stack crash, etc)

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Message-ID: <20160628143212.17215.qmail@ns.sciencehorizons.net>
Date:	28 Jun 2016 10:32:12 -0400
From:	"George Spelvin" <linux@...encehorizons.net>
To:	herbert@...dor.apana.org.au, linux@...encehorizons.net
Cc:	linux-bluetooth@...r.kernel.org, linux-crypto@...r.kernel.org,
	luto@...capital.net, netdev@...r.kernel.org
Subject: Re: Doing crypto in small stack buffers (bluetooth vs vmalloc-stack crash, etc)

> We have actually gained quite a bit of documentation recently.
> Have you looked at Documentation/DocBook/crypto-API.tmpl?
> 
> More is always welcome of course.

It's improved since I last looked at it, but there are still many structures
that aren't described:

- struct crypto_instance
- struct crypto_spawn
- struct crypto_blkcipher
- struct blkcipher_desc
- More on the context structures returned by crypto_tfm_ctx

Also not mentioned in the documentation is that some algorithms *do*
have different implementations depending on key size.  SHA-2 is the
classic example.