linux-kernel - Re: [RFC PATCH 01/21] crypto: scomp - Revert "add support for deflate rfc1950 (zlib)"

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Message-ID: <ZMuBpm2No70LqgZI@gcabiddu-mobl1.ger.corp.intel.com>
Date:   Thu, 3 Aug 2023 11:29:58 +0100
From:   Giovanni Cabiddu <giovanni.cabiddu@...el.com>
To:     Ard Biesheuvel <ardb@...nel.org>
CC:     "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Eric Biggers <ebiggers@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Haren Myneni <haren@...ibm.com>,
        Nick Terrell <terrelln@...com>,
        Minchan Kim <minchan@...nel.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Jens Axboe <axboe@...nel.dk>,
        Richard Weinberger <richard@....at>,
        David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        qat-linux <qat-linux@...el.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC PATCH 01/21] crypto: scomp - Revert "add support for
 deflate rfc1950 (zlib)"

On Thu, Aug 03, 2023 at 11:59:00AM +0200, Ard Biesheuvel wrote:
> Any clue why zlib_deflate was chosen in this case?
I believe it was done for integrity.
The output of zlib_deflate is raw deflate with an header and a footer
defined in rfc1950. The footer contains a checksum which gets
calculated over the uncompressed data during compression and checked
after decompression.

-- 
Giovanni