linux-kernel - Re: [PATCH 2/4] crypto: drbg - update FIPS CTR self-checks to aes256

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Date:   Mon, 30 Oct 2023 11:23:49 +0100
From:   Stephan Mueller <smueller@...onox.de>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Dimitri John Ledkov <dimitri.ledkov@...onical.com>
Cc:     simo@...hat.com, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] crypto: drbg - update FIPS CTR self-checks to aes256

Am Sonntag, 29. Oktober 2023, 21:48:21 CET schrieb Dimitri John Ledkov:

Hi Dimitri,

> When originally drbg was introduced FIPS self-checks for all types but
> CTR were using the most preferred parameters for each type of
> DRBG. Update CTR self-check to use aes256.
> 
> Fixes: 541af946fe ("crypto: drbg - SP800-90A Deterministic Random Bit
> Generator") Signed-off-by: Dimitri John Ledkov
> <dimitri.ledkov@...onical.com>



> ---
>  crypto/drbg.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/crypto/drbg.c b/crypto/drbg.c
> index 2cce18dcfc..b120e2866b 100644
> --- a/crypto/drbg.c
> +++ b/crypto/drbg.c
> @@ -1478,8 +1478,8 @@ static int drbg_generate(struct drbg_state *drbg,
>  			err = alg_test("drbg_pr_hmac_sha256",
>  				       "drbg_pr_hmac_sha256", 0, 0);
>  		else if (drbg->core->flags & DRBG_CTR)
> -			err = alg_test("drbg_pr_ctr_aes128",
> -				       "drbg_pr_ctr_aes128", 0, 0);
> +			err = alg_test("drbg_pr_ctr_aes256",
> +				       "drbg_pr_ctr_aes256", 0, 0);
>  		else
>  			err = alg_test("drbg_pr_sha256",
>  				       "drbg_pr_sha256", 0, 0);
> @@ -2017,7 +2017,7 @@ static inline int __init drbg_healthcheck_sanity(void)
> return 0;
> 
>  #ifdef CONFIG_CRYPTO_DRBG_CTR
> -	drbg_convert_tfm_core("drbg_nopr_ctr_aes128", &coreref, &pr);
> +	drbg_convert_tfm_core("drbg_nopr_ctr_aes256", &coreref, &pr);
>  #endif
>  #ifdef CONFIG_CRYPTO_DRBG_HASH
>  	drbg_convert_tfm_core("drbg_nopr_sha256", &coreref, &pr);

I am not sure again whether this warrants a "Fixes" tag, because the first 
modification is in a commented-out code section and the latter again intends 
to test the DRBG thresholds and thus just needs "a" DRBG.

Anyhow:

Reviewed-by: Stephan Mueller <smueller@...onox.de>


Ciao
Stephan