linux-kernel - Re: crypto: aes - rename local routines to prevent future clashes

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Date:   Thu, 19 Sep 2019 11:43:15 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: crypto: aes - rename local routines to prevent future clashes

Hi Ard,

On Wed, Sep 18, 2019 at 9:59 PM Linux Kernel Mailing List
<linux-kernel@...r.kernel.org> wrote:
> Commit:     724ecd3c0eb7040d423b22332a60d097e2666820
> Parent:     20bb4ef038a97b8bb5c07d2a1125019a93f618b3
> Refname:    refs/heads/master
> Web:        https://git.kernel.org/torvalds/c/724ecd3c0eb7040d423b22332a60d097e2666820
> Author:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
> AuthorDate: Tue Jul 2 21:41:20 2019 +0200
> Committer:  Herbert Xu <herbert@...dor.apana.org.au>
> CommitDate: Fri Jul 26 14:52:03 2019 +1000
>
>     crypto: aes - rename local routines to prevent future clashes
>
>     Rename some local AES encrypt/decrypt routines so they don't clash with
>     the names we are about to introduce for the routines exposed by the
>     generic AES library.
>
>     Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
>     Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

> --- a/crypto/aes_generic.c
> +++ b/crypto/aes_generic.c
> @@ -1332,7 +1332,7 @@ EXPORT_SYMBOL_GPL(crypto_aes_set_key);
>         f_rl(bo, bi, 3, k);     \
>  } while (0)
>
> -static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
> +static void crypto_aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
>  {
>         const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);

Looking ay the bloat-o-meter output:

crypto_aes_encrypt                             -    3158   +3158
crypto_aes_decrypt                             -    3154   +3154
aes_decrypt                                 3154    1276   -1878
aes_encrypt                                 3158    1270   -1888

Can't this just call aes_encrypt() now?
CONFIG_CRYPTO_AES already selects CRYPTO_LIB_AES?
Or does the latter has less features (it's smaller, too)?

>         u32 b0[4], b1[4];
> @@ -1402,7 +1402,7 @@ static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
>         i_rl(bo, bi, 3, k);     \
>  } while (0)
>
> -static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
> +static void crypto_aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
>  {
>         const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);

aes_decrypt()?

>         u32 b0[4], b1[4];

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds