encrypt_packet.c

/**
 * Pull request #651 (https://github.com/h2o/quicly/pull/651) introduced an extra parameter called `payload` that specifies the
 * location of the payload to be encrypted (i.e., out-of-place encryption). Custom encryption callbacks can either adopt the new
 * API directly, or use a wrapper function that copies the out-of-place payload then calls the original function.
 *
 * The function below is an example of such a wrapper function.
 */
void new_encrypt_packet(struct st_quicly_crypto_engine_t *engine, quicly_conn_t *conn, ptls_cipher_context_t *header_protect_ctx,
                        ptls_aead_context_t *packet_protect_ctx, ptls_iovec_t datagram, size_t first_byte_at,
                        size_t payload_from, const void *payload, uint64_t packet_number, int coalesced)
{
    if (datagram.base + payload_from != payload)
        memcpy(datagram.base, payload, datagram.len - payload_from - packet_protect_ctx->algo->tag_size);
    old_encrypt_packet(engine, conn, header_protect_ctx, packet_protext_ctx, datagram, first_byte_at, payload_from,
                       packet_number, coalesced);
}