linux-kernel - Re: [EXT] [PATCH v6 3/4] crypto: caam - add in-kernel interface for blob generator

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Message-ID: <7c9c093a-cfb8-c997-87f8-db769eaa2c62@pengutronix.de>
Date:   Fri, 15 Apr 2022 22:07:01 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Pankaj Gupta <pankaj.gupta@....com>,
        Horia Geanta <horia.geanta@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Sumit Garg <sumit.garg@...aro.org>,
        David Gstir <david@...ma-star.at>,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Franck Lenormand <franck.lenormand@....com>,
        Richard Weinberger <richard@....at>,
        Jan Luebbe <j.luebbe@...gutronix.de>,
        James Morris <jmorris@...ei.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Eric Biggers <ebiggers@...nel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "keyrings@...r.kernel.org" <keyrings@...r.kernel.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        David Howells <dhowells@...hat.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        James Bottomley <jejb@...ux.ibm.com>,
        "tharvey@...eworks.com" <tharvey@...eworks.com>,
        "Serge E. Hallyn" <serge@...lyn.com>
Subject: Re: [EXT] [PATCH v6 3/4] crypto: caam - add in-kernel interface for
 blob generator

On 28.03.22 11:29, Pankaj Gupta wrote:
>>> struct keyblob_info {
>>>         void *key;
>>>         size_t key_len;
>>>
>>>         void *blob;
>>>         size_t blob_len;
>>>
>>>         size_t key_mod_len;
>>>         const void *key_mod;
>>> };
>>
>> I can do that.
>>
> 
> Please do. Thanks.

I went with your other suggestion instead: void *input and void *output.
This keeps the code simple and avoids having to do:

if (encap) {
  in = info->key;
  in_len = info->key_len;
  out = info->blob_len;
  out_len = info->key_len + CAAM_BLOB_OVERHEAD; 
} else {
  in = info->blob;
  in_len = info->blob_len;
  out = info->key_len;
  out_len = info->blob_len - CAAM_BLOB_OVERHEAD; 
}

> Patch 4/4, needs to be re-worked to.
> 
>> Whats your opinion on the desc size computation? Comment the macro or
>> add the static inline helper?
>>
> 
> Comment the macro is fine.
> 
>> Cheers,
>> Ahmad
>>
>> --
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> 
> 


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