[gnutls-devel] Guile-GnuTLS | Draft: Add the HMAC functions (!5)

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civodul started a new discussion on guile/src/core.c: https://gitlab.com/gnutls/guile/-/merge_requests/5#note_1219865011

> +
> +SCM_DEFINE (scm_gnutls_hmac_copy, "hmac-copy", 1, 0, 0,
> +	    (SCM hmac),
> +	    "Return a copy of the current @var{hmac} state, "
> +	    "or @code{#f} if this is not supported.")
> +#define FUNC_NAME s_scm_gnutls_hmac_copy
> +{
> +  scm_gnutls_hmac_and_algorithm_t c_hmac =
> +    scm_to_gnutls_hmac (hmac, 1, FUNC_NAME);
> +  gnutls_hmac_hd_t c_ret = NULL;
> +  c_ret = gnutls_hmac_copy (c_hmac->handle);
> +  if (c_ret == NULL)
> +    {
> +      return SCM_BOOL_F;
> +    }
> +  scm_gnutls_hmac_and_algorithm_t c_combined =

Should it just call `scm_gnutls_error` when it gets NULL?  That would make it more convenient to use (no need to check for `#f`).

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