linux-kernel - Re: [PATCH v5 1/2] crypto: caam - fix pkcs1pad(rsa-caam, sha256) failure because of invalid input

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Message-ID: <VI1PR0402MB348536AFAAE417EC5F541D74981E0@VI1PR0402MB3485.eurprd04.prod.outlook.com>
Date:   Tue, 28 May 2019 10:58:36 +0000
From:   Horia Geanta <horia.geanta@....com>
To:     Iuliana Prodan <iuliana.prodan@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Aymen Sghaier <aymen.sghaier@....com>
CC:     "David S. Miller" <davem@...emloft.net>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH v5 1/2] crypto: caam - fix pkcs1pad(rsa-caam, sha256)
 failure because of invalid input

On 5/28/2019 12:52 PM, Iuliana Prodan wrote:
> The problem is with the input data size sent to CAAM for encrypt/decrypt.
> Pkcs1pad is failing due to pkcs1 padding done in SW starting with0x01
> instead of 0x00 0x01.
> CAAM expects an input of modulus size. For this we strip the leading
> zeros in case the size is more than modulus or pad the input with zeros
> until the modulus size is reached.
> 
> Signed-off-by: Iuliana Prodan <iuliana.prodan@....com>
Reviewed-by: Horia Geantă <horia.geanta@....com>

Thanks,
Horia