[gnutls-devel] GnuTLS | prf: add function to retrieve early keying material (!894)

[Development of GNU's TLS library]

Nikos Mavrogiannopoulos started a new discussion on lib/prf.c: https://gitlab.com/gnutls/gnutls/merge_requests/894#note_160825573

>  }
>  
> +/**
> + * gnutls_prf_early:
> + * @session: is a #gnutls_session_t type.
> + * @label_size: length of the @label variable.
> + * @label: label used in PRF computation, typically a short string.
> + * @context_size: length of the @extra variable.
> + * @context: optional extra data to seed the PRF with.
> + * @outsize: size of pre-allocated output buffer to hold the output.
> + * @out: pre-allocated buffer to hold the generated data.
> + *
> + * This function is similar to gnutls_prf_rfc5705(), but only works in
> + * TLS 1.3 or later to export early keying material.
> + *
> + * Note that the keying material is only available after the

If this function is only useful in a hook function of a specific message, would it make sense to have its own hook, and thus being calculated and stored only for applications that need it?

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