linux-kernel - Re: [PATCH v8 7/8] crypto: caam - enable prediction resistance in HRWNG

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Date:   Tue, 17 Mar 2020 19:41:37 +0200
From:   Horia Geantă <horia.geanta@....com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>
Cc:     Andrei Botila <andrei.botila@....com>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Iuliana Prodan <iuliana.prodan@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH v8 7/8] crypto: caam - enable prediction resistance in
 HRWNG

On 3/16/2020 5:01 PM, Andrey Smirnov wrote:
> Instantiate CAAM RNG with prediction resistance enabled to improve its
> quality (with PR on DRNG is forced to reseed from TRNG every time
> random data is generated).
> 
> Management Complex firmware with version lower than 10.20.0
> doesn't provide prediction resistance support. Consider this
> and only instantiate rng when mc f/w version is lower.
> 
As mentioned previously, this does not compile.

Please include the dependency
"bus: fsl-mc: add api to retrieve mc version"
https://patchwork.kernel.org/patch/11352493/
in the patch set.

> @@ -564,6 +579,26 @@ static void caam_remove_debugfs(void *root)
>  }
>  #endif
>  
> +#ifdef CONFIG_FSL_MC_BUS
> +static bool check_version(struct fsl_mc_version *mc_version, u32 major,
> +			  u32 minor, u32 revision)
> +{
> +	if (mc_version->major > major)
> +		return true;
> +
> +	if (mc_version->major == major) {
> +		if (mc_version->minor > minor)
> +			return true;
> +
> +		if (mc_version->minor == minor && mc_version->revision > 0)
There's a typo in the code we provided, sorry for this.
Should be:
		if (mc_version->minor == minor && mc_version->revision > revision)

Thanks,
Horia