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prop289: Add random bytes to the unused portion of the cell
Signed-off-by: David Goulet <dgoulet@torproject.org>
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@ -572,6 +572,14 @@ relay_send_command_from_edge_,(streamid_t stream_id, circuit_t *circ,
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if (payload_len)
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memcpy(cell.payload+RELAY_HEADER_SIZE, payload, payload_len);
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/* Add random bytes to the unused portion of the payload, to foil attacks
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* where the other side can predict all of the bytes in the payload and thus
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* compute authenticated sendme cells without seeing the traffic. See
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* proposal 289. */
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crypto_fast_rng_getbytes(get_thread_fast_rng(),
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cell.payload + RELAY_HEADER_SIZE + payload_len,
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RELAY_PAYLOAD_SIZE - payload_len);
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log_debug(LD_OR,"delivering %d cell %s.", relay_command,
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cell_direction == CELL_DIRECTION_OUT ? "forward" : "backward");
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