具有FEC的golang加密安全、生产级可靠UDP库.zip

<img src="kcp-go.png" alt="kcp-go" height="50px" /> [![GoDoc][1]][2] [![Powered][9]][10] [![MIT licensed][11]][12] [![Build Status][3]][4] [![Go Report Card][5]][6] [![Coverage Statusd][7]][8] [![Sourcegraph][13]][14] [1]: https://godoc.org/github.com/xtaci/kcp-go?status.svg [2]: https://pkg.go.dev/github.com/xtaci/kcp-go [3]: https://travis-ci.org/xtaci/kcp-go.svg?branch=master [4]: https://travis-ci.org/xtaci/kcp-go [5]: https://goreportcard.com/badge/github.com/xtaci/kcp-go [6]: https://goreportcard.com/report/github.com/xtaci/kcp-go [7]: https://codecov.io/gh/xtaci/kcp-go/branch/master/graph/badge.svg [8]: https://codecov.io/gh/xtaci/kcp-go [9]: https://img.shields.io/badge/KCP-Powered-blue.svg [10]: https://github.com/skywind3000/kcp [11]: https://img.shields.io/badge/license-MIT-blue.svg [12]: LICENSE [13]: https://sourcegraph.com/github.com/xtaci/kcp-go/-/badge.svg [14]: https://sourcegraph.com/github.com/xtaci/kcp-go?badge ## Introduction **kcp-go** is a **Production-Grade Reliable-UDP** library for [golang](https://golang.org/). This library intents to provide a **smooth, resilient, ordered, error-checked and anonymous** delivery of streams over **UDP** packets, it has been battle-tested with opensource project [kcptun](https://github.com/xtaci/kcptun). Millions of devices(from low-end MIPS routers to high-end servers) have deployed **kcp-go** powered program in a variety of forms like **online games, live broadcasting, file synchronization and network acceleration**. [Lastest Release](https://github.com/xtaci/kcp-go/releases) ## Features 1. Designed for **Latency-sensitive** scenarios. 1. **Cache friendly** and **Memory optimized** design, offers extremely **High Performance** core. 1. Handles **>5K concurrent connections** on a single commodity server. 1. Compatible with [net.Conn](https://golang.org/pkg/net/#Conn) and [net.Listener](https://golang.org/pkg/net/#Listener), a drop-in replacement for [net.TCPConn](https://golang.org/pkg/net/#TCPConn). 1. [FEC(Forward Error Correction)](https://en.wikipedia.org/wiki/Forward_error_correction) Support with [Reed-Solomon Codes](https://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_correction) 1. Packet level encryption support with [AES](https://en.wikipedia.org/wiki/Advanced_Encryption_Standard), [TEA](https://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm), [3DES](https://en.wikipedia.org/wiki/Triple_DES), [Blowfish](https://en.wikipedia.org/wiki/Blowfish_(cipher)), [Cast5](https://en.wikipedia.org/wiki/CAST-128), [Salsa20]( https://en.wikipedia.org/wiki/Salsa20), etc. in [CFB](https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Cipher_Feedback_.28CFB.29) mode, which generates completely anonymous packet. 1. Only **A fixed number of goroutines** will be created for the entire server application, costs in **context switch** between goroutines have been taken into consideration. 1. Compatible with [skywind3000's](https://github.com/skywind3000) C version with various improvements. 1. Platform-dependent optimizations: [sendmmsg](http://man7.org/linux/man-pages/man2/sendmmsg.2.html) and [recvmmsg](http://man7.org/linux/man-pages/man2/recvmmsg.2.html) were expoloited for linux. ## Documentation For complete documentation, see the associated [Godoc](https://godoc.org/github.com/xtaci/kcp-go). ## Specification <img src="frame.png" alt="Frame Format" height="109px" /> ``` NONCE: 16bytes cryptographically secure random number, nonce changes for every packet. CRC32: CRC-32 checksum of data using the IEEE polynomial FEC TYPE: typeData = 0xF1 typeParity = 0xF2 FEC SEQID: monotonically increasing in range: [0, (0xffffffff/shardSize) * shardSize - 1] SIZE: The size of KCP frame plus 2 ``` ``` +-----------------+ | SESSION | +-----------------+ | KCP(ARQ) | +-----------------+ | FEC(OPTIONAL) | +-----------------+ | CRYPTO(OPTIONAL)| +-----------------+ | UDP(PACKET) | +-----------------+ | IP | +-----------------+ | LINK | +-----------------+ | PHY | +-----------------+ (LAYER MODEL OF KCP-GO) ``` ## Examples 1. [simple examples](https://github.com/xtaci/kcp-go/tree/master/examples) 2. [kcptun client](https://github.com/xtaci/kcptun/blob/master/client/main.go) 3. [kcptun server](https://github.com/xtaci/kcptun/blob/master/server/main.go) ## Benchmark ``` === Model Name: MacBook Pro Model Identifier: MacBookPro14,1 Processor Name: Intel Core i5 Processor Speed: 3.1 GHz Number of Processors: 1 Total Number of Cores: 2 L2 Cache (per Core): 256 KB L3 Cache: 4 MB Memory: 8 GB === $ go test -v -run=^$ -bench . beginning tests, encryption:salsa20, fec:10/3 goos: darwin goarch: amd64 pkg: github.com/xtaci/kcp-go BenchmarkSM4-4 50000 32180 ns/op 93.23 MB/s 0 B/op 0 allocs/op BenchmarkAES128-4 500000 3285 ns/op 913.21 MB/s 0 B/op 0 allocs/op BenchmarkAES192-4 300000 3623 ns/op 827.85 MB/s 0 B/op 0 allocs/op BenchmarkAES256-4 300000 3874 ns/op 774.20 MB/s 0 B/op 0 allocs/op BenchmarkTEA-4 100000 15384 ns/op 195.00 MB/s 0 B/op 0 allocs/op BenchmarkXOR-4 20000000 89.9 ns/op 33372.00 MB/s 0 B/op 0 allocs/op BenchmarkBlowfish-4 50000 26927 ns/op 111.41 MB/s 0 B/op 0 allocs/op BenchmarkNone-4 30000000 45.7 ns/op 65597.94 MB/s 0 B/op 0 allocs/op BenchmarkCast5-4 50000 34258 ns/op 87.57 MB/s 0 B/op 0 allocs/op Benchmark3DES-4 10000 117149 ns/op 25.61 MB/s 0 B/op 0 allocs/op BenchmarkTwofish-4 50000 33538 ns/op 89.45 MB/s 0 B/op 0 allocs/op BenchmarkXTEA-4 30000 45666 ns/op 65.69 MB/s 0 B/op 0 allocs/op BenchmarkSalsa20-4 500000 3308 ns/op 906.76 MB/s 0 B/op 0 allocs/op BenchmarkCRC32-4 20000000 65.2 ns/op 15712.43 MB/s BenchmarkCsprngSystem-4 1000000 1150 ns/op 13.91 MB/s BenchmarkCsprngMD5-4 10000000 145 ns/op 110.26 MB/s BenchmarkCsprngSHA1-4 10000000 158 ns/op 126.54 MB/s BenchmarkCsprngNonceMD5-4 10000000 153 ns/op 104.22 MB/s BenchmarkCsprngNonceAES128-4 100000000 19.1 ns/op 837.81 MB/s BenchmarkFECDecode-4 1000000 1119 ns/op 1339.61 MB/s 1606 B/op 2 allocs/op BenchmarkFECEncode-4 2000000 832 ns/op 1801.83 MB/s 17 B/op 0 allocs/op BenchmarkFlush-4 5000000 272 ns/op 0 B/op 0 allocs/op BenchmarkEchoSpeed4K-4 5000 259617 ns/op 15.78 MB/s 5451 B/op 149 allocs/op BenchmarkEchoSpeed64K-4 1000 1706084 ns/op 38.41 MB/s 56002 B/op 1604 allocs/op BenchmarkEchoSpeed512K-4 100 14345505 ns/op 36.55 MB/s 482597 B/op 13045 allocs/op BenchmarkEchoSpeed1M-4 30 34859104 ns/op 30.08 MB/s 1143773 B/op 27186 allocs/op BenchmarkSinkSpeed4K-4 50000 31369 ns/op 130.57 MB/s 1566 B/op 30 allocs/op BenchmarkSinkSpeed64K-4 5000 329065 ns/op 199.16 MB/s 21529 B/op 453 allocs/op BenchmarkSinkSpeed256K-4 500 2373354 ns/op 220.91 MB/s 166332 B/op 3554 allocs/op BenchmarkSinkSpeed1M-4 300 5117927 ns/op 204.88 MB/s 310378 B/op 6988 allocs/op PASS ok github.com/xtaci/kcp-go 50.349s ``` ``` === Raspberry Pi 4 === ➜ kcp-go git:(master) cat /proc/cpuinfo processor : 0 model name : ARMv7 Processor rev 3 (v7l) BogoMIPS : 108.00 Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32 CPU implementer : 0x41 CPU architecture: 7