/**
* Encrypt a cell <b>cell</b> that we are creating, and sending on
* <b>circuit</b> to the origin.
*
* The integrity field and recognized field of <b>cell</b>'s relay headers
* must be set to zero.
*/
void
relay_encrypt_cell_inbound(cell_t *cell,
or_circuit_t *or_circ)
{
relay_set_digest(or_circ->crypto.b_digest, cell);
/* encrypt one layer */
relay_crypt_one_payload(or_circ->crypto.b_crypto, cell->payload);
}
/**
* Encrypt a cell <b>cell</b> that we are creating, and sending on
* <b>circuit</b> to the origin.
*
* The integrity field and recognized field of <b>cell</b>'s relay headers
* must be set to zero.
*/
void
relay_encrypt_cell_inbound(cell_t *cell,
or_circuit_t *or_circ)
{
relay_set_digest(or_circ->crypto.b_digest, cell);
/* Record cell digest as the SENDME digest if need be. */
sendme_record_sending_cell_digest(TO_CIRCUIT(or_circ), NULL);
/* encrypt one layer */
relay_crypt_one_payload(or_circ->crypto.b_crypto, cell->payload);
}
/**
* Encrypt a cell <b>cell</b> that we are creating, and sending outbound on
* <b>circ</b> until the hop corresponding to <b>layer_hint</b>.
*
* The integrity field and recognized field of <b>cell</b>'s relay headers
* must be set to zero.
*/
void
relay_encrypt_cell_outbound(cell_t *cell,
origin_circuit_t *circ,
crypt_path_t *layer_hint)
{
crypt_path_t *thishop; /* counter for repeated crypts */
relay_set_digest(layer_hint->crypto.f_digest, cell);
thishop = layer_hint;
/* moving from farthest to nearest hop */
do {
tor_assert(thishop);
log_debug(LD_OR,"encrypting a layer of the relay cell.");
relay_crypt_one_payload(thishop->crypto.f_crypto, cell->payload);
thishop = thishop->prev;
} while (thishop != circ->cpath->prev);
}
