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Shadowsocks 2022 Implementations

This document tracks and compares implementations of Shadowsocks 2022 by feature and spec compliance, and showcases some benchmark and speedtest results.

1. Implementations

1.1. Reference Implementations

Reference implementations of Shadowsocks 2022 are fully spec-compliant, performance-optimized, and ready for production.

shadowsocks-go shadowsocks-rust sing-box
Description A versatile and efficient proxy platform for secure communications. CLIs and libraries written in Rust. The universal proxy platform.
URL https://github.com/database64128/shadowsocks-go https://github.com/shadowsocks/shadowsocks-rust https://github.com/SagerNet/sing-shadowsocks, https://github.com/SagerNet/sing-box
License AGPLv3 MIT GPLv3
Server ✅ ✅ ✅
Relay ❌ ❌ ✅
Client ✅ ✅ ✅
EIH (Extensible Identity Headers) ✅ ✅ ✅

1.2. Derived Implementations

Derived implementations are based on one of the reference implementations but developed separately by downstream developers.

v2ray-core (SagerNet Fork) Xray-core
URL https://github.com/SagerNet/v2ray-core https://github.com/XTLS/Xray-core
Protocol Implementation sing-shadowsocks sing-shadowsocks
License GPLv3 MPLv2
Server ✅ ✅
Relay ✅ ✅
Client ✅ ✅
EIH (Extensible Identity Headers) ✅ ✅

1.3. GUI Clients

1.4. Other Implementations

2. Benchmarks

2.1. Header Benchmarks

https://github.com/database64128/cubic-go-playground/blob/main/shadowsocks/udpheader/udpheader_test.go

BenchmarkGenSaltHkdfSha1-8          	  372712	      3283 ns/op	    1264 B/op	      18 allocs/op
BenchmarkGenSaltBlake3-8            	  770426	      1554 ns/op	       0 B/op	       0 allocs/op
BenchmarkAesEcbHeaderEncryption-8   	99224395	        12.84 ns/op	       0 B/op	       0 allocs/op
BenchmarkAesEcbHeaderDecryption-8   	100000000	        11.79 ns/op	       0 B/op	       0 allocs/op

2.2. Full UDP Packet Construction Benchmarks

https://github.com/database64128/cubic-go-playground/blob/main/shadowsocks/udp_test.go

BenchmarkShadowsocksAEADAes256GcmEncryption-8             	  252819	      4520 ns/op	    2160 B/op	      23 allocs/op
BenchmarkShadowsocksAEADAes256GcmWithBlake3Encryption-8   	  320718	      3367 ns/op	     896 B/op	       5 allocs/op
BenchmarkDraftSeparateHeaderAes256GcmEncryption-8         	 2059383	       590.5 ns/op	       0 B/op	       0 allocs/op
BenchmarkDraftXChaCha20Poly1305Encryption-8               	  993336	      1266 ns/op	       0 B/op	       0 allocs/op

2.3. Speed Tests

  • CPU: i9-13900K
  • Linux: 6.0.8-arch1-1
  • shadowsocks-go: commit 88c2d63ccd0b022f76902195ceb1559eaf15a3a7 (2022-11-13) built with Go 1.19.3
  • shadowsocks-rust: commit ff3590a830a84b4ee4f4b98623897487eed43196 (2022-11-21) built with Rust 1.65
  • TCP: iperf3 -c ::1 -p 30001 -R
  • UDP 🔽: iperf3 -c ::1 -p 30001 -Rub 0 -l 1382
  • UDP 🔼: iperf3 -c ::1 -p 30001 -ub 0 -l 1390
2022-blake3-aes-128-gcm TCP UDP 🔽 UDP 🔼
shadowsocks-go 31.0Gbps 5.20Gbps 6.03Gbps
shadowsocks-rust 27.7Gbps 4.32Gbps 4.38Gbps
shadowsocks-rust TCP UDP 🔽
2022-blake3-aes-128-gcm 27.7Gbps 4.32Gbps
2022-blake3-aes-256-gcm Gbps Gbps
2022-blake3-chacha20-poly1305 Gbps Gbps
2022-blake3-chacha8-poly1305 Gbps Gbps
aes-128-gcm Gbps Gbps
aes-256-gcm Gbps Gbps
chacha20-poly1305 Gbps Gbps