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From: Herbert Xu <herbert@gondor.apana.org.au>
To: David Howells <dhowells@redhat.com>,
	Mimi Zohar <zohar@linux.vnet.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
	linux-integrity@vger.kernel.org, keyrings@vger.kernel.org,
	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 1/4] X.509: Parse public key parameters from x509 for akcipher
Date: Thu, 28 Feb 2019 17:01:25 +0800
Message-ID: <20190228090125.6n62v4oxpwl5yzv4@gondor.apana.org.au> (raw)
In-Reply-To: <20190228082801.2aofw23r2shzwy4n@altlinux.org>

On Thu, Feb 28, 2019 at 11:28:01AM +0300, Vitaly Chikunov wrote:
> On Thu, Feb 28, 2019 at 03:51:41PM +0800, Herbert Xu wrote:
> > On Thu, Feb 28, 2019 at 10:04:49AM +0300, Vitaly Chikunov wrote:
> > > 
> > > It seems that you insist on set_params to be removed and both key and
> > > params to be passed into set_{pub,priv}_key. This means reworking all
> > > existing RSA drivers and callers, right? Can you please confirm that
> > > huge rework to avoid misunderstanding?
> > 
> > I don't understand why we even need to touch the existing RSA
> > drivers.  Nothing needs to change as far as they're concerned.
> > 
> > Only the new algorithms would need to decode the extra parameters
> > in the key stream.
> 
>         int (*set_pub_key)(struct crypto_akcipher *tfm, const void *key,
>                            unsigned int keylen);
>         int (*set_priv_key)(struct crypto_akcipher *tfm, const void *key,
>                             unsigned int keylen);
> 
> So you want `keylen' not to cover parameters data, but parameters
> actually present in key after `keylen' bytes (in come packed format)?
> (And if there is no parameters appended, there is still appended some
> marker, like 0, to signify that there is no parameters.)
> 
> This looks a bit counter-intuitive usage of arguments (as argument
> signifying length does not cover all arguments data), is this ok to you?

This is how we handle things in DH as well as other places such
as authenc.

Cheers,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-06 13:36 [RFC PATCH 0/4] crypto: Add EC-RDSA algorithm Vitaly Chikunov
2019-01-06 13:36 ` [RFC PATCH 1/4] X.509: Parse public key parameters from x509 for akcipher Vitaly Chikunov
2019-02-09 21:42   ` Vitaly Chikunov
2019-02-10 18:46     ` Vitaly Chikunov
2019-02-19  4:37       ` Herbert Xu
2019-02-24  6:48         ` Vitaly Chikunov
2019-02-28  6:14           ` Herbert Xu
2019-02-28  7:04             ` Vitaly Chikunov
2019-02-28  7:11               ` Vitaly Chikunov
2019-02-28  7:51               ` Herbert Xu
2019-02-28  8:28                 ` Vitaly Chikunov
2019-02-28  9:01                   ` Herbert Xu [this message]
2019-02-28 10:33                     ` Vitaly Chikunov
2019-02-28 10:37                       ` Herbert Xu
2019-03-01 16:06                         ` Vitaly Chikunov
2019-01-06 13:36 ` [RFC PATCH 2/4] akcipher: Introduce verify2 for public key algorithms Vitaly Chikunov
2019-01-06 13:36 ` [RFC PATCH 3/4] KEYS: set correct flags for keyctl if encrypt is not supported Vitaly Chikunov
2019-01-06 13:36 ` [RFC PATCH 4/4] crypto: Add EC-RDSA algorithm Vitaly Chikunov
2019-01-06 18:11   ` Stephan Müller
2019-01-07  8:07     ` Vitaly Chikunov
2019-01-07  8:31       ` Stephan Mueller
2019-01-07  9:04         ` Vitaly Chikunov
2019-01-16 16:15         ` David Howells
2019-01-16 16:19 ` [RFC PATCH 2/4] akcipher: Introduce verify2 for public key algorithms David Howells

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