linux-kernel - Re: [PATCH v2 2/6] crypto: arm64/sm3-ce

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Date:   Fri, 31 Dec 2021 15:05:31 +0800
From:   liulongfang <liulongfang@...wei.com>
To:     Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Vitaly Chikunov <vt@...linux.org>,
        Eric Biggers <ebiggers@...gle.com>,
        "Eric Biggers" <ebiggers@...nel.org>,
        Gilad Ben-Yossef <gilad@...yossef.com>,
        "Ard Biesheuvel" <ardb@...nel.org>,
        Jussi Kivilinna <jussi.kivilinna@....fi>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, <linux-crypto@...r.kernel.org>,
        <x86@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/6] crypto: arm64/sm3-ce - make dependent on sm3
 library

On 2021/12/22 12:50, Tianjia Zhang Wrote:
> SM3 generic library is stand-alone implementation, sm3-ce can depend
> on the SM3 library instead of sm3-generic.
> 
> Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
> ---
>  arch/arm64/crypto/Kconfig       |  2 +-
>  arch/arm64/crypto/sm3-ce-glue.c | 20 ++++++++++++++------
>  2 files changed, 15 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig
> index addfa413650b..2a965aa0188d 100644
> --- a/arch/arm64/crypto/Kconfig
> +++ b/arch/arm64/crypto/Kconfig
> @@ -45,7 +45,7 @@ config CRYPTO_SM3_ARM64_CE
>  	tristate "SM3 digest algorithm (ARMv8.2 Crypto Extensions)"
>  	depends on KERNEL_MODE_NEON
>  	select CRYPTO_HASH
> -	select CRYPTO_SM3
> +	select CRYPTO_LIB_SM3
>  
>  config CRYPTO_SM4_ARM64_CE
>  	tristate "SM4 symmetric cipher (ARMv8.2 Crypto Extensions)"
> diff --git a/arch/arm64/crypto/sm3-ce-glue.c b/arch/arm64/crypto/sm3-ce-glue.c
> index d71faca322f2..3198f31c9446 100644
> --- a/arch/arm64/crypto/sm3-ce-glue.c
> +++ b/arch/arm64/crypto/sm3-ce-glue.c
> @@ -27,7 +27,7 @@ static int sm3_ce_update(struct shash_desc *desc, const u8 *data,
>  			 unsigned int len)
>  {
>  	if (!crypto_simd_usable())
> -		return crypto_sm3_update(desc, data, len);
> +		return sm3_update(shash_desc_ctx(desc), data, len);
>  
>  	kernel_neon_begin();
>  	sm3_base_do_update(desc, data, len, sm3_ce_transform);
> @@ -39,7 +39,7 @@ static int sm3_ce_update(struct shash_desc *desc, const u8 *data,
>  static int sm3_ce_final(struct shash_desc *desc, u8 *out)
>  {
>  	if (!crypto_simd_usable())
> -		return crypto_sm3_finup(desc, NULL, 0, out);
> +		return sm3_final(shash_desc_ctx(desc), out);
>  
>  	kernel_neon_begin();
>  	sm3_base_do_finalize(desc, sm3_ce_transform);
> @@ -51,14 +51,22 @@ static int sm3_ce_final(struct shash_desc *desc, u8 *out)
>  static int sm3_ce_finup(struct shash_desc *desc, const u8 *data,
>  			unsigned int len, u8 *out)
>  {
> -	if (!crypto_simd_usable())
> -		return crypto_sm3_finup(desc, data, len, out);
> +	if (!crypto_simd_usable()) {
> +		struct sm3_state *sctx = shash_desc_ctx(desc);
> +
> +		if (len)
> +			sm3_update(sctx, data, len);
> +		sm3_final(sctx, out);
> +		return 0;
> +	}
>  
>  	kernel_neon_begin();
> -	sm3_base_do_update(desc, data, len, sm3_ce_transform);
> +	if (len)
> +		sm3_base_do_update(desc, data, len, sm3_ce_transform);
> +	sm3_base_do_finalize(desc, sm3_ce_transform);
>  	kernel_neon_end();
>  
> -	return sm3_ce_final(desc, out);
> +	return sm3_base_finish(desc, out);
>  }
>  
>  static struct shash_alg sm3_alg = {
>You have modified the implementation of SM3 algorithm, so what benefits will be gained
after such modification?
What flaws are solved or can performance be improved?
Thanks.
Longfang.