linux-kernel - Re: [PATCH v7 09/13] crypto: ecdsa - Replace ndigits with nbits where precision is needed

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Date: Thu, 21 Mar 2024 19:19:20 +0200
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Stefan Berger" <stefanb@...ux.ibm.com>, <keyrings@...r.kernel.org>,
 <linux-crypto@...r.kernel.org>, <herbert@...dor.apana.org.au>,
 <davem@...emloft.net>
Cc: <linux-kernel@...r.kernel.org>, <saulo.alessandre@....jus.br>,
 <lukas@...ner.de>, <bbhushan2@...vell.com>
Subject: Re: [PATCH v7 09/13] crypto: ecdsa - Replace ndigits with nbits
 where precision is needed

On Wed Mar 20, 2024 at 1:47 PM EET, Stefan Berger wrote:
> Replace the usage of ndigits with nbits where precise space calculations
> are needed, such as in ecdsa_max_size where the length of a coordinate is
> determined.
>
> Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
> Tested-by: Lukas Wunner <lukas@...ner.de>
> ---
>  crypto/ecdsa.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/crypto/ecdsa.c b/crypto/ecdsa.c
> index 1814f009f971..4daefb40c37a 100644
> --- a/crypto/ecdsa.c
> +++ b/crypto/ecdsa.c
> @@ -266,7 +266,7 @@ static unsigned int ecdsa_max_size(struct crypto_akcipher *tfm)
>  {
>  	struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm);
>  
> -	return ctx->pub_key.ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
> +	return DIV_ROUND_UP(ctx->curve->nbits, 8);
>  }
>  
>  static int ecdsa_nist_p384_init_tfm(struct crypto_akcipher *tfm)

Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

BR, Jarkko