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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. shadowsocks-rust Speed Tests

shadowsocks-rust TCP UDP
2022-blake3-aes-128-gcm 12.2Gbps 14.2Gbps
2022-blake3-aes-256-gcm 10.9Gbps 12.5Gbps
2022-blake3-chacha20-poly1305 8.05Gbps 2.35Gbps
2022-blake3-chacha8-poly1305 8.36Gbps 2.60Gbps
aes-128-gcm 8.99Gbps 13.5Gbps
aes-256-gcm 8.21Gbps 11.9Gbps
chacha20-poly1305 6.55Gbps 8.66Gbps