Struct KeySchedulePreHandshake

pub(crate) struct KeySchedulePreHandshake {
    ks: KeySchedule,
}

The “early secret” stage of the key schedule.

Call KeySchedulePreHandshake::new to create it without a PSK, or use From<KeyScheduleEarly> to create it with a PSK.

         0
         |
         v
PSK -> HKDF-Extract = Early Secret
         |
         +-----> Derive-Secret(., "ext binder" | "res binder", "")
         |                     = binder_key
         |
         +-----> Derive-Secret(., "c e traffic", ClientHello)
         |                     = client_early_traffic_secret
         |
         +-----> Derive-Secret(., "e exp master", ClientHello)
         |                     = early_exporter_master_secret
         v
   Derive-Secret(., "derived", "")

Fields

ks: KeySchedule

Implementations

impl KeySchedulePreHandshake

pub(crate) fn new(suite: &'static Tls13CipherSuite) -> Self

Creates a key schedule without a PSK.

pub(crate) fn into_handshake( self, shared_secret: SharedSecret, ) -> KeyScheduleHandshakeStart

shared_secret is the “(EC)DHE” secret input to “HKDF-Extract”:

(EC)DHE -> HKDF-Extract = Handshake Secret

Trait Implementations

impl From<KeyScheduleEarly> for KeySchedulePreHandshake

Creates a key schedule with a PSK.

fn from(_: KeyScheduleEarly) -> Self

Converts to this type from the input type.