linux-kernel - Re: [PATCH v4 4/5] crypto: hisilicon/hpre

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Date:   Fri, 11 Dec 2020 15:08:22 +0100
From:   Stephan Mueller <smueller@...onox.de>
To:     Meng Yu <yumeng18@...wei.com>, herbert@...dor.apana.org.au,
        davem@...emloft.net
Cc:     linux-crypto@...r.kernel.org, xuzaibo@...wei.com,
        wangzhou1@...ilicon.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/5] crypto: hisilicon/hpre - add 'ECDH' algorithm

Am Freitag, den 11.12.2020, 14:30 +0800 schrieb Meng Yu:
> 
> +/* size in bytes of the n prime */
> +#define HPRE_ECC_NIST_P128_N_SIZE      16

Do we truly need P-128? Besides, I do not see that curve being defined in
contemporary cipher specs.

> +#define HPRE_ECC_NIST_P192_N_SIZE      24
> +#define HPRE_ECC_NIST_P224_N_SIZE      28
> +#define HPRE_ECC_NIST_P256_N_SIZE      32
> +#define HPRE_ECC_NIST_P320_N_SIZE      40

Do we truly need P-320? Besides, I do not see that curve being defined in
contemporary cipher specs.

> +#define HPRE_ECC_NIST_P384_N_SIZE      48
> +#define HPRE_ECC_NIST_P521_N_SIZE      66
> +
> +/* size in bytes */
> +#define HPRE_ECC_HW256_KSZ_B   32
> +#define HPRE_ECC_HW384_KSZ_B   48
> +#define HPRE_ECC_HW576_KSZ_B   72
> +
> +#define HPRE_ECDH_MAX_SZ       HPRE_ECC_HW576_KSZ_B]

Ciao
Stephan