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feat!: reserve counters and decrypt data messages in batches - #129
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`begin_encapsulate` now returns an `EncapsulateBatch` that borrows the tunnel until `finish(len)` reserves `len` consecutive counters, and `begin_decapsulate` returns a `DecapsulateBatch` that collects all data messages of one session, such as the segments of a GRO datagram, before `finish` hands them to a decryption worker. Either side copies the session key and builds the AEAD key once per batch instead of once per message.
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begin_encapsulatenow returns anEncapsulateBatchthat borrows the tunnel untilfinish(len)reserveslenconsecutive counters, so a caller with several packets for one tunnel copies the session key and builds the AEAD key once per batch instead of once per message. On the receive side,begin_decapsulatereturns aDecapsulateBatchthat collects all data messages of one session, such as the segments of a GRO datagram, into one decryption job with a single key copy.