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Re: [PATCH 1/8] crypto: hash: add zero length message hash for shax and md5

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On Mon, Oct 12, 2015 at 06:53:39PM +0200, LABBE Corentin wrote:
> Some crypto drivers cannot process empty data message and return a
> precalculated hash for md5/sha1/sha224/sha256.
> 
> This patch add thoses precalculated hash in include/crypto.
> 
> Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
> ---
>  include/crypto/md5.h |  5 +++++
>  include/crypto/sha.h | 20 ++++++++++++++++++++
>  2 files changed, 25 insertions(+)
> 
> diff --git a/include/crypto/md5.h b/include/crypto/md5.h
> index 146af82..6496ee0 100644
> --- a/include/crypto/md5.h
> +++ b/include/crypto/md5.h
> @@ -13,6 +13,11 @@
>  #define MD5_H2	0x98badcfeUL
>  #define MD5_H3	0x10325476UL
>  
> +static const u8 md5_zero_message_hash[MD5_DIGEST_SIZE] = {
> +	0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04,
> +	0xe9, 0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e,
> +};
> +

This potentially creates this structure in every file that includes
md5.h.  How about putting it into md5_generic and exporting it?

> diff --git a/include/crypto/sha.h b/include/crypto/sha.h
> index dd7905a..02d7ffb 100644
> --- a/include/crypto/sha.h
> +++ b/include/crypto/sha.h
> @@ -64,6 +64,26 @@
>  #define SHA512_H6	0x1f83d9abfb41bd6bULL
>  #define SHA512_H7	0x5be0cd19137e2179ULL
>  
> +static const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {
> +	0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
> +	0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
> +	0xaf, 0xd8, 0x07, 0x09
> +};

Ditto.

Thanks,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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Thread

[PATCH] crypto: add precalculated hash for zero message length LABBE Corentin <clabbe.montjoie@gmail.com> - 2015-10-12 19:00 +0200
  [PATCH 8/8] crypto: testmgr: Use the xxx_zero_message_hash from headers LABBE Corentin <clabbe.montjoie@gmail.com> - 2015-10-12 19:00 +0200
    Re: [PATCH 8/8] crypto: testmgr: Use the xxx_zero_message_hash from  headers kbuild test robot <lkp@intel.com> - 2015-10-12 21:30 +0200
      Re: [PATCH 8/8] crypto: testmgr: Use the xxx_zero_message_hash from  headers Corentin LABBE <clabbe.montjoie@gmail.com> - 2015-10-12 21:40 +0200
  [PATCH 3/8] crypto: ccp: Use precalculated hash from headers LABBE Corentin <clabbe.montjoie@gmail.com> - 2015-10-12 19:00 +0200
  [PATCH 1/8] crypto: hash: add zero length message hash for shax and md5 LABBE Corentin <clabbe.montjoie@gmail.com> - 2015-10-12 19:00 +0200
    Re: [PATCH 1/8] crypto: hash: add zero length message hash for shax  and md5 Herbert Xu <herbert@gondor.apana.org.au> - 2015-10-14 12:10 +0200
      Re: [PATCH 1/8] crypto: hash: add zero length message hash for shax  and md5 LABBE Corentin <montjoie.mailing@gmail.com> - 2015-10-15 11:50 +0200
        Re: [PATCH 1/8] crypto: hash: add zero length message hash for shax  and md5 Ulf Hansson <ulf.hansson@linaro.org> - 2015-10-16 13:30 +0200
  [PATCH 5/8] crypto: akcipher: fix typos in include/crypto/akcipher.h LABBE Corentin <clabbe.montjoie@gmail.com> - 2015-10-12 19:00 +0200

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