added text on _gnutls_dh_compute_key

diff --git a/lib/nettle/pk.c b/lib/nettle/pk.c
index 8b3cba6bf6444ff29c3095fc66afeb2ff333cef7..c7ef0d78c59e577fb35f399bcfd9fb0b0f0aa008 100644 (file)
--- a/lib/nettle/pk.c
+++ b/lib/nettle/pk.c
@@ -954,6 +954,8 @@ int _gnutls_dh_generate_key(gnutls_dh_params_t dh_params,
        return ret;
 }
 
+/* Note that the value of Z will have the leading bytes stripped if they are zero -
+ * which follows the TLS approach. */
 int _gnutls_dh_compute_key(gnutls_dh_params_t dh_params,
                           const gnutls_datum_t *priv_key, const gnutls_datum_t *pub_key,
                           const gnutls_datum_t *peer_key, gnutls_datum_t *Z)