linux-kernel - Re: [RFC PATCH 5/8] KEYS: Provide software public key query function [ver 3]

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Message-ID: <25139.1463048363@warthog.procyon.org.uk>
Date:	Thu, 12 May 2016 11:19:23 +0100
From:	David Howells <dhowells@...hat.com>
To:	Mat Martineau <mathew.j.martineau@...ux.intel.com>,
	tadeusz.struk@...el.com
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
	linux-crypto@...r.kernel.org, dwmw2@...radead.org
Subject: Re: [RFC PATCH 5/8] KEYS: Provide software public key query function [ver 3]

Mat Martineau <mathew.j.martineau@...ux.intel.com> wrote:

> > +	len = crypto_akcipher_maxsize(tfm);
> > +	info->key_size = len * 8;
> > +	info->max_data_size = len;
> > +	info->max_sig_size = len;
> > +	info->max_enc_size = len;
> > +	info->max_dec_size = len;
> 
> If len > UINT16_MAX, should UINT16_MAX be reported as the max size? Similar
> question for len*8 and key_size.

key_size is 32 bits, but the other sizes are all 16 bits, so you would need a
524288-bit key to exceed their capacity.  I'm not sure that's likely anytime
soon, but should I just make all the sizes 32-bit anyway?

David