2178d6a70c
A maintainable, extensible BitTorrent client (C11, Linux/io_uring) targeting 10 GbE saturation. All torrent functionality is built from scratch; liburing is the only linked third-party dependency on the data path. Implements Phases 1-7 of the roadmap: - core: page-aligned buffer pool, MPMC/Treiber queues, bitfields, worker pool - crypto: SHA-1/256 (SHA-NI + scalar), Merkle (BEP-52), RC4 (MSE) - bencode/metainfo: zero-copy parser, v1/v2/hybrid .torrent + magnet - peer: sans-IO wire codec, MSE/PE handshake state machine, BEP-10, ut_metadata, PEX - piece/storage: block-level multi-peer engine, rarest-first + endgame, per-file completion events + single-file relocate (move-as-you-finish) - tracker/dht: HTTP + UDP (BEP-15) trackers, BEP-5 KRPC iterative lookup - platform: io_uring reactor (SQPOLL, registered buffers, SEND_ZC) - surface: versioned RPC, native plugin ABI, sandboxed Lua scripting, nautd/nautctl Verified against libtorrent (single/multi/hybrid, MSE, magnet-via-DHT, swarm); unit + interop tests green; ASan/UBSan/TSan clean. Scripting reference in docs/scripting.md. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
21 lines
863 B
C
21 lines
863 B
C
/* rc4.h — ARC4 stream cipher for MSE/PE (BitTorrent message-stream encryption).
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*
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* MSE keys RC4 from a SHA-1 of the negotiated DH secret and *discards the first
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* 1024 keystream bytes* before use (the well-known RC4 keystream-bias defense),
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* so naut_rc4_init takes a drop count. This is obfuscation, not strong crypto —
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* its job is firewall/ISP evasion, and the engineering concern here is that it
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* costs real CPU at 10 GbE (see the throughput budget), hence it lives behind a
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* tight, in-place API.
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*/
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#ifndef NAUT_RC4_H
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#define NAUT_RC4_H
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#include "naut/common.h"
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typedef struct { uint8_t s[256]; uint8_t i, j; } naut_rc4;
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void naut_rc4_init(naut_rc4 *c, const void *key, size_t keylen, size_t drop);
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/* XOR keystream into buf in place (encrypt == decrypt). */
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void naut_rc4_xor(naut_rc4 *c, void *buf, size_t len);
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#endif /* NAUT_RC4_H */
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