Re: GNU Emacs-libnettle-libhogweed integration patch v1

[Eli Zaretskii <eliz@gnu.org>]

> From: Ted Zlatanov <tzz@lifelogs.com>
> Date: Sun, 06 Oct 2013 05:15:09 -0400
> Cc: nettle-bugs@lists.lysator.liu.se
> 
> This is the first cut of the Nettle integration for your review.

Thanks.

> +DEFUN ("nettle-available-p", Fnettle_available_p, Snettle_available_p, 0, 0, 0,
> +       doc: /* Return t if libnettle+libhogweed are available in this instance of Emacs.  */)
> +     (void)
> +{
> +  return Qt;
> +}

For the record: this will have to be changed for MS-Windows, to
support dynamic loading, like we do, e.g., in decompress.c.

> +DEFUN ("nettle-hmac", Fnettle_hmac, Snettle_hmac, 3, 3, 0,
> +       doc: /* Hash INPUT string with HASH-METHOD and KEY into a unibyte string according to HMAC (RFC 2104).

The first line of the doc string is too long.  (There are others with
similar problems.)

> +          digest = xzalloc (length);
> +          hmac_digest (outer_ctx, inner_ctx, state_ctx, alg, length, digest);
> +
> +          ret = make_unibyte_string (digest, length);

Instead of xzalloc, then make_unibyte_string, I think you should be
able to allocate a string first, and then work on its SDATA.  This
will save you from at least one allocation.

> +          free (digest);
> +          free (state_ctx);
> +          free (outer_ctx);
> +          free (inner_ctx);

We tend to use xfree, not free.

> +  sha1_mode = 0 == strcmp (SDATA (hash_method), "sha1");
> +  sha256_mode = 0 == strcmp (SDATA (hash_method), "sha256");

Perhaps using Fstring_equal is better here, not sure.

> +      uint8_t *digest = xzalloc (outlength);
         ^^^^^^^
Why not 'unsigned char'?

> +  if (!rsa_keypair_from_der (&key, NULL, 0, SCHARS (public_key), SDATA (public_key)) &&
> +      !rsa_keypair_from_sexp (&key, NULL, 0, SCHARS (public_key), SDATA (public_key)))

The && should be at the beginning of a line, not at the end.