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

[Development of GNU's TLS library]

Daiki Ueno commented on a discussion on lib/handshake.c: https://gitlab.com/gnutls/gnutls/merge_requests/894#note_160819254

>  			_mbuffer_xfree(&bufel);
>  			return ret;
>  		}
> +		/* If we are sending a PSK, generate early secrets here.
> +		 * This cannot be done in pre_shared_key.c, because it
> +		 * relies on transcript hash of a Client Hello. */
> +		if (type == GNUTLS_HANDSHAKE_CLIENT_HELLO &&

The problem is that the client hasn't decided the version yet at this point and `security_parameters.pversion` is set to TLS 1.2.

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