linux-kernel - Re: [RFC PATCH] akcipher: Introduce verify2 for public key algorithms

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Date:   Wed, 16 Jan 2019 16:22:37 +0000
From:   David Howells <dhowells@...hat.com>
To:     Vitaly Chikunov <vt@...linux.org>
Cc:     dhowells@...hat.com, Herbert Xu <herbert@...dor.apana.org.au>,
        davem@...emloft.net, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] akcipher: Introduce verify2 for public key algorithms

Vitaly Chikunov <vt@...linux.org> wrote:

> This will be hard to do since there is at least tree device that use
> this interface (and who know how much out of tree):
> 
>   drivers$ git grep cra_name.*rsa
>   crypto/caam/caampkc.c:          .cra_name = "rsa",
>   crypto/ccp/ccp-crypto-rsa.c:            .cra_name = "rsa",
>   crypto/qat/qat_common/qat_asym_algs.c:          .cra_name = "rsa",
> 
> Interface seems to be designed that verify() call is interchangeable
> with encrypt().
> 
> Two verify does not seem that bad since there is common code for the old
> interface that removes code duplication and simplifies driver
> implementation (RSA drivers only need to implement encrypt).

You could move the comparison into core crypto code if it's makes more sense
than moving the comparison to the crypto algorithm ->verify() call.  It makes
more sense than the upper layers having to cover the differences between the
algo modules.

David