[−][src]Module tox_core::net_crypto
Net crypto module allows to send data between two friends and provides encryption, ordered delivery, and perfect forward secrecy.
It can use both UDP and TCP (over relays) transport protocols to send data and can switch between them without the peers needing to disconnect and reconnect. For example two Tox friends might first connect over TCP and a few seconds later switch to UDP when a direct UDP connection becomes possible. Direct UDP is preferred over TCP because it is direct and isn't limited by possibly congested TCP relays.
Modules
| errors | Module for errors of NetCrypto. |
Structs
| ConnectionAddr | UDP address of a connection with the time when last UDP packet was received |
| CryptoConnection | Secure connection to send data between two friends that provides encryption, ordered delivery, and perfect forward secrecy. |
| NetCrypto | Struct that manages crypto connections to friends and handles net crypto packets from both UDP and TCP connections. |
| NetCryptoNewArgs | Arguments for creating new |
| RecvPacket | Received but not handled data packet that is stored in |
| SentPacket | Sent but not confirmed data packet that is stored in |
| StatusPacketWithTime | Packet that should be sent to the peer every second together with info how many times it was sent and when it was sent last time |
Enums
| ConnectionStatus | Status of crypto connection. |
| StatusPacket | Packet that should be sent every second. Depending on |
Constants
| CONGESTION_EVENT_TIMEOUT | Timeout for increasing speed after congestion event. |
| CONGESTION_LAST_SENT_ARRAY_SIZE | How many numbers of sent lossless packets should be recorded for congestion
control. It should be bigger than |
| CONGESTION_QUEUE_ARRAY_SIZE | How many last sizes of |
| CRYPTO_MIN_QUEUE_LENGTH | Minimum packets in the send queue to reduce send rate. |
| CRYPTO_PACKET_MIN_RATE | Minimum packets rate per second. |
| CRYPTO_SEND_PACKET_INTERVAL | Interval between sending cookie request/handshake packets. |
| CRYPTO_SEND_PACKET_INTERVAL_MS | Interval in ms between sending cookie request/handshake packets. |
| DEFAULT_RTT | Default RTT (round trip time) |
| MAX_NUM_SENDPACKET_TRIES | The maximum number of times we try to send the cookie request and handshake before giving up |
| PACKET_COUNTER_AVERAGE_INTERVAL | The dT for the average packet receiving rate calculations. |
| PACKET_COUNTER_AVERAGE_INTERVAL_MS | The dT for the average packet receiving rate calculations (in ms). |
| REQUEST_PACKETS_COMPARE_CONSTANT | Ratio of recv queue size / recv packet rate (in seconds) times the number of ms between request packets to send at that ratio. |
| SEND_QUEUE_CLEARANCE_TIME | If the send queue grows so that it will take more than 2 seconds to send all its packet we will reduce send rate. |
| TCP_RTT | RTT (round trip time) for TCP connections |
| UDP_DIRECT_TIMEOUT | If we don't receive UDP packets for this amount of time the direct UDP connection is considered dead |