shadowsocksr-outbound-v1.patch

From 7f519b454c9ad3fe251cda71d7be5bef2e7aa41e Mon Sep 17 00:00:00 2001
From: 0xffffharry <95022881+0xffffharry@users.noreply.github.com>
Date: Sun, 3 Aug 2025 05:42:48 +0000
Subject: [PATCH] add shadowsocksr outbound support

---
 go.mod                                        |   3 +
 go.sum                                        |   4 +
 include/registry.go                           |  10 +-
 protocol/shadowsocksr/outbound.go             | 182 ++++++++
 transport/clashssr/obfs/base.go               |   9 +
 transport/clashssr/obfs/http_post.go          |   9 +
 transport/clashssr/obfs/http_simple.go        | 405 ++++++++++++++++++
 transport/clashssr/obfs/obfs.go               |  42 ++
 transport/clashssr/obfs/plain.go              |  15 +
 transport/clashssr/obfs/random_head.go        |  71 +++
 transport/clashssr/obfs/tls1.2_ticket_auth.go | 226 ++++++++++
 .../clashssr/protocol/auth_aes128_md5.go      |  18 +
 .../clashssr/protocol/auth_aes128_sha1.go     | 277 ++++++++++++
 transport/clashssr/protocol/auth_chain_a.go   | 306 +++++++++++++
 transport/clashssr/protocol/auth_chain_b.go   |  97 +++++
 transport/clashssr/protocol/auth_sha1_v4.go   | 182 ++++++++
 transport/clashssr/protocol/base.go           |  75 ++++
 transport/clashssr/protocol/origin.go         |  33 ++
 transport/clashssr/protocol/packet.go         |  36 ++
 transport/clashssr/protocol/protocol.go       |  76 ++++
 transport/clashssr/protocol/stream.go         |  50 +++
 21 files changed, 2122 insertions(+), 4 deletions(-)
 create mode 100644 protocol/shadowsocksr/outbound.go
 create mode 100644 transport/clashssr/obfs/base.go
 create mode 100644 transport/clashssr/obfs/http_post.go
 create mode 100644 transport/clashssr/obfs/http_simple.go
 create mode 100644 transport/clashssr/obfs/obfs.go
 create mode 100644 transport/clashssr/obfs/plain.go
 create mode 100644 transport/clashssr/obfs/random_head.go
 create mode 100644 transport/clashssr/obfs/tls1.2_ticket_auth.go
 create mode 100644 transport/clashssr/protocol/auth_aes128_md5.go
 create mode 100644 transport/clashssr/protocol/auth_aes128_sha1.go
 create mode 100644 transport/clashssr/protocol/auth_chain_a.go
 create mode 100644 transport/clashssr/protocol/auth_chain_b.go
 create mode 100644 transport/clashssr/protocol/auth_sha1_v4.go
 create mode 100644 transport/clashssr/protocol/base.go
 create mode 100644 transport/clashssr/protocol/origin.go
 create mode 100644 transport/clashssr/protocol/packet.go
 create mode 100644 transport/clashssr/protocol/protocol.go
 create mode 100644 transport/clashssr/protocol/stream.go

diff --git a/go.mod b/go.mod
index dd6373eb..99a9aae3 100644
--- a/go.mod
+++ b/go.mod
@@ -55,10 +55,13 @@ require (
 	howett.net/plist v1.0.1
 )
 
+require github.com/Dreamacro/protobytes v0.0.0-20230617041236-6500a9f4f158 // indirect
+
 //replace github.com/sagernet/sing => ../sing
 
 require (
 	filippo.io/edwards25519 v1.1.0 // indirect
+	github.com/Dreamacro/clash v1.18.0
 	github.com/ajg/form v1.5.1 // indirect
 	github.com/akutz/memconn v0.1.0 // indirect
 	github.com/alexbrainman/sspi v0.0.0-20231016080023-1a75b4708caa // indirect
diff --git a/go.sum b/go.sum
index e495f174..6909d4bc 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,9 @@
 filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
 filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
+github.com/Dreamacro/clash v1.18.0 h1:tic7ykTOCaT0mxwAkXo6QP3LN3Nps8oZz9atgr6TU8A=
+github.com/Dreamacro/clash v1.18.0/go.mod h1:r//xe/2pA3Zl+3fjIiI/o6RjIVd+z87drCD58dpRnFg=
+github.com/Dreamacro/protobytes v0.0.0-20230617041236-6500a9f4f158 h1:JFnwKplz9hj8ubqYjm8HkgZS1Rvz9yW+u/XCNNTxr0k=
+github.com/Dreamacro/protobytes v0.0.0-20230617041236-6500a9f4f158/go.mod h1:QvmEZ/h6KXszPOr2wUFl7Zn3hfFNYdfbXwPVDTyZs6k=
 github.com/ajg/form v1.5.1 h1:t9c7v8JUKu/XxOGBU0yjNpaMloxGEJhUkqFRq0ibGeU=
 github.com/ajg/form v1.5.1/go.mod h1:uL1WgH+h2mgNtvBq0339dVnzXdBETtL2LeUXaIv25UY=
 github.com/akutz/memconn v0.1.0 h1:NawI0TORU4hcOMsMr11g7vwlCdkYeLKXBcxWu2W/P8A=
diff --git a/include/registry.go b/include/registry.go
index 94d56db1..c2f4572d 100644
--- a/include/registry.go
+++ b/include/registry.go
@@ -3,7 +3,7 @@ package include
 import (
 	"context"
 
-	"github.com/sagernet/sing-box"
+	box "github.com/sagernet/sing-box"
 	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/adapter/endpoint"
 	"github.com/sagernet/sing-box/adapter/inbound"
@@ -35,6 +35,7 @@ import (
 	"github.com/sagernet/sing-box/protocol/tun"
 	"github.com/sagernet/sing-box/protocol/vless"
 	"github.com/sagernet/sing-box/protocol/vmess"
+	"github.com/sagernet/sing-box/protocol/shadowsocksr"
 	"github.com/sagernet/sing-box/service/resolved"
 	"github.com/sagernet/sing-box/service/ssmapi"
 	E "github.com/sagernet/sing/common/exceptions"
@@ -84,6 +85,7 @@ func OutboundRegistry() *outbound.Registry {
 	socks.RegisterOutbound(registry)
 	http.RegisterOutbound(registry)
 	shadowsocks.RegisterOutbound(registry)
+	shadowsocksr.RegisterOutbound(registry)
 	vmess.RegisterOutbound(registry)
 	trojan.RegisterOutbound(registry)
 	tor.RegisterOutbound(registry)
@@ -145,7 +147,7 @@ func registerStubForRemovedInbounds(registry *inbound.Registry) {
 }
 
 func registerStubForRemovedOutbounds(registry *outbound.Registry) {
-	outbound.Register[option.ShadowsocksROutboundOptions](registry, C.TypeShadowsocksR, func(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.ShadowsocksROutboundOptions) (adapter.Outbound, error) {
-		return nil, E.New("ShadowsocksR is deprecated and removed in sing-box 1.6.0")
-	})
+	// outbound.Register[option.ShadowsocksROutboundOptions](registry, C.TypeShadowsocksR, func(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.ShadowsocksROutboundOptions) (adapter.Outbound, error) {
+	// 	return nil, E.New("ShadowsocksR is deprecated and removed in sing-box 1.6.0")
+	// })
 }
diff --git a/protocol/shadowsocksr/outbound.go b/protocol/shadowsocksr/outbound.go
new file mode 100644
index 00000000..77660030
--- /dev/null
+++ b/protocol/shadowsocksr/outbound.go
@@ -0,0 +1,182 @@
+package shadowsocksr
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/adapter/outbound"
+	"github.com/sagernet/sing-box/common/dialer"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing-box/transport/clashssr/obfs"
+	"github.com/sagernet/sing-box/transport/clashssr/protocol"
+	"github.com/sagernet/sing/common/bufio"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/logger"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+
+	"github.com/Dreamacro/clash/transport/shadowsocks/core"
+	"github.com/Dreamacro/clash/transport/shadowsocks/shadowstream"
+	"github.com/Dreamacro/clash/transport/socks5"
+)
+
+func RegisterOutbound(registry *outbound.Registry) {
+	outbound.Register[option.ShadowsocksROutboundOptions](registry, C.TypeShadowsocksR, NewOutbound)
+}
+
+type Outbound struct {
+	outbound.Adapter
+	logger     logger.ContextLogger
+	dialer     N.Dialer
+	serverAddr M.Socksaddr
+	cipher     core.Cipher
+	obfs       obfs.Obfs
+	protocol   protocol.Protocol
+}
+
+func NewOutbound(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.ShadowsocksROutboundOptions) (adapter.Outbound, error) {
+	outboundDialer, err := dialer.New(ctx, options.DialerOptions, options.ServerIsDomain())
+	if err != nil {
+		return nil, err
+	}
+	var cipher string
+	switch options.Method {
+	case "none":
+		cipher = "dummy"
+	default:
+		cipher = options.Method
+	}
+	outbound := &Outbound{
+		Adapter:    outbound.NewAdapterWithDialerOptions(C.TypeShadowsocks, tag, options.Network.Build(), options.DialerOptions),
+		logger:     logger,
+		dialer:     outboundDialer,
+		serverAddr: options.ServerOptions.Build(),
+	}
+	outbound.cipher, err = core.PickCipher(cipher, nil, options.Password)
+	if err != nil {
+		return nil, err
+	}
+	var (
+		ivSize int
+		key    []byte
+	)
+	if cipher == "dummy" {
+		ivSize = 0
+		key = core.Kdf(options.Password, 16)
+	} else {
+		streamCipher, ok := outbound.cipher.(*core.StreamCipher)
+		if !ok {
+			return nil, fmt.Errorf("%s is not none or a supported stream cipher in ssr", cipher)
+		}
+		ivSize = streamCipher.IVSize()
+		key = streamCipher.Key
+	}
+	var obfsOverhead int
+	outbound.obfs, obfsOverhead, err = obfs.PickObfs(options.Obfs, &obfs.Base{
+		Host:   options.Server,
+		Port:   int(options.ServerPort),
+		Key:    key,
+		IVSize: ivSize,
+		Param:  options.ObfsParam,
+	})
+	if err != nil {
+		return nil, E.Cause(err, "initialize obfs")
+	}
+	outbound.protocol, err = protocol.PickProtocol(options.Protocol, &protocol.Base{
+		Key:      key,
+		Overhead: obfsOverhead,
+		Param:    options.ProtocolParam,
+	})
+	if err != nil {
+		return nil, E.Cause(err, "initialize protocol")
+	}
+	return outbound, nil
+}
+
+func (h *Outbound) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
+	ctx, metadata := adapter.ExtendContext(ctx)
+	metadata.Outbound = h.Tag()
+	metadata.Destination = destination
+	switch network {
+	case N.NetworkTCP:
+		h.logger.InfoContext(ctx, "outbound connection to ", destination)
+		conn, err := h.dialer.DialContext(ctx, network, h.serverAddr)
+		if err != nil {
+			return nil, err
+		}
+		conn = h.cipher.StreamConn(h.obfs.StreamConn(conn))
+		writeIv, err := conn.(*shadowstream.Conn).ObtainWriteIV()
+		if err != nil {
+			conn.Close()
+			return nil, err
+		}
+		conn = h.protocol.StreamConn(conn, writeIv)
+		err = M.SocksaddrSerializer.WriteAddrPort(conn, destination)
+		if err != nil {
+			conn.Close()
+			return nil, E.Cause(err, "write request")
+		}
+		return conn, nil
+	case N.NetworkUDP:
+		conn, err := h.ListenPacket(ctx, destination)
+		if err != nil {
+			return nil, err
+		}
+		return bufio.NewBindPacketConn(conn, destination), nil
+	default:
+		return nil, E.Extend(N.ErrUnknownNetwork, network)
+	}
+}
+
+func (h *Outbound) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
+	ctx, metadata := adapter.ExtendContext(ctx)
+	metadata.Outbound = h.Tag()
+	metadata.Destination = destination
+	h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
+	outConn, err := h.dialer.DialContext(ctx, N.NetworkUDP, h.serverAddr)
+	if err != nil {
+		return nil, err
+	}
+	packetConn := h.cipher.PacketConn(bufio.NewUnbindPacketConn(outConn))
+	packetConn = h.protocol.PacketConn(packetConn)
+	packetConn = &ssPacketConn{packetConn, outConn.RemoteAddr()}
+	return packetConn, nil
+}
+
+type ssPacketConn struct {
+	net.PacketConn
+	rAddr net.Addr
+}
+
+func (spc *ssPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
+	packet, err := socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b)
+	if err != nil {
+		return
+	}
+	return spc.PacketConn.WriteTo(packet[3:], spc.rAddr)
+}
+
+func (spc *ssPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, _, e := spc.PacketConn.ReadFrom(b)
+	if e != nil {
+		return 0, nil, e
+	}
+
+	addr := socks5.SplitAddr(b[:n])
+	if addr == nil {
+		return 0, nil, errors.New("parse addr error")
+	}
+
+	udpAddr := addr.UDPAddr()
+	if udpAddr == nil {
+		return 0, nil, errors.New("parse addr error")
+	}
+
+	copy(b, b[len(addr):])
+	return n - len(addr), udpAddr, e
+}
diff --git a/transport/clashssr/obfs/base.go b/transport/clashssr/obfs/base.go
new file mode 100644
index 00000000..7fd1b84c
--- /dev/null
+++ b/transport/clashssr/obfs/base.go
@@ -0,0 +1,9 @@
+package obfs
+
+type Base struct {
+	Host   string
+	Port   int
+	Key    []byte
+	IVSize int
+	Param  string
+}
diff --git a/transport/clashssr/obfs/http_post.go b/transport/clashssr/obfs/http_post.go
new file mode 100644
index 00000000..4be6cbe8
--- /dev/null
+++ b/transport/clashssr/obfs/http_post.go
@@ -0,0 +1,9 @@
+package obfs
+
+func init() {
+	register("http_post", newHTTPPost, 0)
+}
+
+func newHTTPPost(b *Base) Obfs {
+	return &httpObfs{Base: b, post: true}
+}
diff --git a/transport/clashssr/obfs/http_simple.go b/transport/clashssr/obfs/http_simple.go
new file mode 100644
index 00000000..c1ea7673
--- /dev/null
+++ b/transport/clashssr/obfs/http_simple.go
@@ -0,0 +1,405 @@
+package obfs
+
+import (
+	"bytes"
+	"encoding/hex"
+	"io"
+	"math/rand"
+	"net"
+	"strconv"
+	"strings"
+
+	"github.com/Dreamacro/clash/common/pool"
+)
+
+func init() {
+	register("http_simple", newHTTPSimple, 0)
+}
+
+type httpObfs struct {
+	*Base
+	post bool
+}
+
+func newHTTPSimple(b *Base) Obfs {
+	return &httpObfs{Base: b}
+}
+
+type httpConn struct {
+	net.Conn
+	*httpObfs
+	hasSentHeader bool
+	hasRecvHeader bool
+	buf           []byte
+}
+
+func (h *httpObfs) StreamConn(c net.Conn) net.Conn {
+	return &httpConn{Conn: c, httpObfs: h}
+}
+
+func (c *httpConn) Read(b []byte) (int, error) {
+	if c.buf != nil {
+		n := copy(b, c.buf)
+		if n == len(c.buf) {
+			c.buf = nil
+		} else {
+			c.buf = c.buf[n:]
+		}
+		return n, nil
+	}
+
+	if c.hasRecvHeader {
+		return c.Conn.Read(b)
+	}
+
+	buf := pool.Get(pool.RelayBufferSize)
+	defer pool.Put(buf)
+	n, err := c.Conn.Read(buf)
+	if err != nil {
+		return 0, err
+	}
+	pos := bytes.Index(buf[:n], []byte("\r\n\r\n"))
+	if pos == -1 {
+		return 0, io.EOF
+	}
+	c.hasRecvHeader = true
+	dataLength := n - pos - 4
+	n = copy(b, buf[4+pos:n])
+	if dataLength > n {
+		c.buf = append(c.buf, buf[4+pos+n:4+pos+dataLength]...)
+	}
+	return n, nil
+}
+
+func (c *httpConn) Write(b []byte) (int, error) {
+	if c.hasSentHeader {
+		return c.Conn.Write(b)
+	}
+	// 30: head length
+	headLength := c.IVSize + 30
+
+	bLength := len(b)
+	headDataLength := bLength
+	if bLength-headLength > 64 {
+		headDataLength = headLength + rand.Intn(65)
+	}
+	headData := b[:headDataLength]
+	b = b[headDataLength:]
+
+	var body string
+	host := c.Host
+	if len(c.Param) > 0 {
+		pos := strings.Index(c.Param, "#")
+		if pos != -1 {
+			body = strings.ReplaceAll(c.Param[pos+1:], "\n", "\r\n")
+			body = strings.ReplaceAll(body, "\\n", "\r\n")
+			host = c.Param[:pos]
+		} else {
+			host = c.Param
+		}
+	}
+	hosts := strings.Split(host, ",")
+	host = hosts[rand.Intn(len(hosts))]
+
+	buf := pool.GetBuffer()
+	defer pool.PutBuffer(buf)
+	if c.post {
+		buf.WriteString("POST /")
+	} else {
+		buf.WriteString("GET /")
+	}
+	packURLEncodedHeadData(buf, headData)
+	buf.WriteString(" HTTP/1.1\r\nHost: " + host)
+	if c.Port != 80 {
+		buf.WriteString(":" + strconv.Itoa(c.Port))
+	}
+	buf.WriteString("\r\n")
+	if len(body) > 0 {
+		buf.WriteString(body + "\r\n\r\n")
+	} else {
+		buf.WriteString("User-Agent: ")
+		buf.WriteString(userAgent[rand.Intn(len(userAgent))])
+		buf.WriteString("\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\nAccept-Language: en-US,en;q=0.8\r\nAccept-Encoding: gzip, deflate\r\n")
+		if c.post {
+			packBoundary(buf)
+		}
+		buf.WriteString("DNT: 1\r\nConnection: keep-alive\r\n\r\n")
+	}
+	buf.Write(b)
+	_, err := c.Conn.Write(buf.Bytes())
+	if err != nil {
+		return 0, nil
+	}
+	c.hasSentHeader = true
+	return bLength, nil
+}
+
+func packURLEncodedHeadData(buf *bytes.Buffer, data []byte) {
+	dataLength := len(data)
+	for i := 0; i < dataLength; i++ {
+		buf.WriteRune('%')
+		buf.WriteString(hex.EncodeToString(data[i : i+1]))
+	}
+}
+
+func packBoundary(buf *bytes.Buffer) {
+	buf.WriteString("Content-Type: multipart/form-data; boundary=")
+	set := "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+	for i := 0; i < 32; i++ {
+		buf.WriteByte(set[rand.Intn(62)])
+	}
+	buf.WriteString("\r\n")
+}
+
+var userAgent = []string{
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 7.0; Moto C Build/NRD90M.059) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 6.0.1; SM-G532M Build/MMB29T; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/55.0.2883.91 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 5.1.1; SM-J120M Build/LMY47X) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 7.0; Moto G (5) Build/NPPS25.137-93-14) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 7.0; SM-G570M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.80 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 5.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
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+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.65 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 7.1; Mi A1 Build/N2G47H) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.83 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36",
+	"Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.99 Safari/533.4",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.125 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.89 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.111 Safari/537.36 MVisionPlayer/1.0.0.0",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 5.1; A37f Build/LMY47V) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.93 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.86 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.76 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 5.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 6.0.1; CPH1607 Build/MMB29M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/63.0.3239.111 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 6.0.1; vivo 1603 Build/MMB29M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.83 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 6.0.1; SM-G532M Build/MMB29T) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 6.0.1; Redmi 4A Build/MMB29M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/60.0.3112.116 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36",
+	"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.71 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 5.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.90 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.143 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 6.0.1; SM-G532G Build/MMB29T) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.83 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.109 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.131 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 6.0; vivo 1713 Build/MRA58K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.124 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.89 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36",
+}
diff --git a/transport/clashssr/obfs/obfs.go b/transport/clashssr/obfs/obfs.go
new file mode 100644
index 00000000..c56acc8a
--- /dev/null
+++ b/transport/clashssr/obfs/obfs.go
@@ -0,0 +1,42 @@
+package obfs
+
+import (
+	"errors"
+	"fmt"
+	"net"
+)
+
+var (
+	errTLS12TicketAuthIncorrectMagicNumber = errors.New("tls1.2_ticket_auth incorrect magic number")
+	errTLS12TicketAuthTooShortData         = errors.New("tls1.2_ticket_auth too short data")
+	errTLS12TicketAuthHMACError            = errors.New("tls1.2_ticket_auth hmac verifying failed")
+)
+
+type authData struct {
+	clientID [32]byte
+}
+
+type Obfs interface {
+	StreamConn(net.Conn) net.Conn
+}
+
+type obfsCreator func(b *Base) Obfs
+
+var obfsList = make(map[string]struct {
+	overhead int
+	new      obfsCreator
+})
+
+func register(name string, c obfsCreator, o int) {
+	obfsList[name] = struct {
+		overhead int
+		new      obfsCreator
+	}{overhead: o, new: c}
+}
+
+func PickObfs(name string, b *Base) (Obfs, int, error) {
+	if choice, ok := obfsList[name]; ok {
+		return choice.new(b), choice.overhead, nil
+	}
+	return nil, 0, fmt.Errorf("Obfs %s not supported", name)
+}
diff --git a/transport/clashssr/obfs/plain.go b/transport/clashssr/obfs/plain.go
new file mode 100644
index 00000000..eb998a47
--- /dev/null
+++ b/transport/clashssr/obfs/plain.go
@@ -0,0 +1,15 @@
+package obfs
+
+import "net"
+
+type plain struct{}
+
+func init() {
+	register("plain", newPlain, 0)
+}
+
+func newPlain(b *Base) Obfs {
+	return &plain{}
+}
+
+func (p *plain) StreamConn(c net.Conn) net.Conn { return c }
diff --git a/transport/clashssr/obfs/random_head.go b/transport/clashssr/obfs/random_head.go
new file mode 100644
index 00000000..b10b01c5
--- /dev/null
+++ b/transport/clashssr/obfs/random_head.go
@@ -0,0 +1,71 @@
+package obfs
+
+import (
+	"encoding/binary"
+	"hash/crc32"
+	"math/rand"
+	"net"
+
+	"github.com/Dreamacro/clash/common/pool"
+)
+
+func init() {
+	register("random_head", newRandomHead, 0)
+}
+
+type randomHead struct {
+	*Base
+}
+
+func newRandomHead(b *Base) Obfs {
+	return &randomHead{Base: b}
+}
+
+type randomHeadConn struct {
+	net.Conn
+	*randomHead
+	hasSentHeader bool
+	rawTransSent  bool
+	rawTransRecv  bool
+	buf           []byte
+}
+
+func (r *randomHead) StreamConn(c net.Conn) net.Conn {
+	return &randomHeadConn{Conn: c, randomHead: r}
+}
+
+func (c *randomHeadConn) Read(b []byte) (int, error) {
+	if c.rawTransRecv {
+		return c.Conn.Read(b)
+	}
+	buf := pool.Get(pool.RelayBufferSize)
+	defer pool.Put(buf)
+	c.Conn.Read(buf)
+	c.rawTransRecv = true
+	c.Write(nil)
+	return 0, nil
+}
+
+func (c *randomHeadConn) Write(b []byte) (int, error) {
+	if c.rawTransSent {
+		return c.Conn.Write(b)
+	}
+	c.buf = append(c.buf, b...)
+	if !c.hasSentHeader {
+		c.hasSentHeader = true
+		dataLength := rand.Intn(96) + 4
+		buf := pool.Get(dataLength + 4)
+		defer pool.Put(buf)
+		rand.Read(buf[:dataLength])
+		binary.LittleEndian.PutUint32(buf[dataLength:], 0xffffffff-crc32.ChecksumIEEE(buf[:dataLength]))
+		_, err := c.Conn.Write(buf)
+		return len(b), err
+	}
+	if c.rawTransRecv {
+		_, err := c.Conn.Write(c.buf)
+		c.buf = nil
+		c.rawTransSent = true
+		return len(b), err
+	}
+	return len(b), nil
+}
diff --git a/transport/clashssr/obfs/tls1.2_ticket_auth.go b/transport/clashssr/obfs/tls1.2_ticket_auth.go
new file mode 100644
index 00000000..10f2786a
--- /dev/null
+++ b/transport/clashssr/obfs/tls1.2_ticket_auth.go
@@ -0,0 +1,226 @@
+package obfs
+
+import (
+	"bytes"
+	"crypto/hmac"
+	"encoding/binary"
+	"math/rand"
+	"net"
+	"strings"
+	"time"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/transport/ssr/tools"
+)
+
+func init() {
+	register("tls1.2_ticket_auth", newTLS12Ticket, 5)
+	register("tls1.2_ticket_fastauth", newTLS12Ticket, 5)
+}
+
+type tls12Ticket struct {
+	*Base
+	*authData
+}
+
+func newTLS12Ticket(b *Base) Obfs {
+	r := &tls12Ticket{Base: b, authData: &authData{}}
+	rand.Read(r.clientID[:])
+	return r
+}
+
+type tls12TicketConn struct {
+	net.Conn
+	*tls12Ticket
+	handshakeStatus int
+	decoded         bytes.Buffer
+	underDecoded    bytes.Buffer
+	sendBuf         bytes.Buffer
+}
+
+func (t *tls12Ticket) StreamConn(c net.Conn) net.Conn {
+	return &tls12TicketConn{Conn: c, tls12Ticket: t}
+}
+
+func (c *tls12TicketConn) Read(b []byte) (int, error) {
+	if c.decoded.Len() > 0 {
+		return c.decoded.Read(b)
+	}
+
+	buf := pool.Get(pool.RelayBufferSize)
+	defer pool.Put(buf)
+	n, err := c.Conn.Read(buf)
+	if err != nil {
+		return 0, err
+	}
+
+	if c.handshakeStatus == 8 {
+		c.underDecoded.Write(buf[:n])
+		for c.underDecoded.Len() > 5 {
+			if !bytes.Equal(c.underDecoded.Bytes()[:3], []byte{0x17, 3, 3}) {
+				c.underDecoded.Reset()
+				return 0, errTLS12TicketAuthIncorrectMagicNumber
+			}
+			size := int(binary.BigEndian.Uint16(c.underDecoded.Bytes()[3:5]))
+			if c.underDecoded.Len() < 5+size {
+				break
+			}
+			c.underDecoded.Next(5)
+			c.decoded.Write(c.underDecoded.Next(size))
+		}
+		n, _ = c.decoded.Read(b)
+		return n, nil
+	}
+
+	if n < 11+32+1+32 {
+		return 0, errTLS12TicketAuthTooShortData
+	}
+
+	if !hmac.Equal(buf[33:43], c.hmacSHA1(buf[11:33])[:10]) || !hmac.Equal(buf[n-10:n], c.hmacSHA1(buf[:n-10])[:10]) {
+		return 0, errTLS12TicketAuthHMACError
+	}
+
+	c.Write(nil)
+	return 0, nil
+}
+
+func (c *tls12TicketConn) Write(b []byte) (int, error) {
+	length := len(b)
+	if c.handshakeStatus == 8 {
+		buf := pool.GetBuffer()
+		defer pool.PutBuffer(buf)
+		for len(b) > 2048 {
+			size := rand.Intn(4096) + 100
+			if len(b) < size {
+				size = len(b)
+			}
+			packData(buf, b[:size])
+			b = b[size:]
+		}
+		if len(b) > 0 {
+			packData(buf, b)
+		}
+		_, err := c.Conn.Write(buf.Bytes())
+		if err != nil {
+			return 0, err
+		}
+		return length, nil
+	}
+
+	if len(b) > 0 {
+		packData(&c.sendBuf, b)
+	}
+
+	if c.handshakeStatus == 0 {
+		c.handshakeStatus = 1
+
+		data := pool.GetBuffer()
+		defer pool.PutBuffer(data)
+
+		data.Write([]byte{3, 3})
+		c.packAuthData(data)
+		data.WriteByte(0x20)
+		data.Write(c.clientID[:])
+		data.Write([]byte{0x00, 0x1c, 0xc0, 0x2b, 0xc0, 0x2f, 0xcc, 0xa9, 0xcc, 0xa8, 0xcc, 0x14, 0xcc, 0x13, 0xc0, 0x0a, 0xc0, 0x14, 0xc0, 0x09, 0xc0, 0x13, 0x00, 0x9c, 0x00, 0x35, 0x00, 0x2f, 0x00, 0x0a})
+		data.Write([]byte{0x1, 0x0})
+
+		ext := pool.GetBuffer()
+		defer pool.PutBuffer(ext)
+
+		host := c.getHost()
+		ext.Write([]byte{0xff, 0x01, 0x00, 0x01, 0x00})
+		packSNIData(ext, host)
+		ext.Write([]byte{0, 0x17, 0, 0})
+		c.packTicketBuf(ext, host)
+		ext.Write([]byte{0x00, 0x0d, 0x00, 0x16, 0x00, 0x14, 0x06, 0x01, 0x06, 0x03, 0x05, 0x01, 0x05, 0x03, 0x04, 0x01, 0x04, 0x03, 0x03, 0x01, 0x03, 0x03, 0x02, 0x01, 0x02, 0x03})
+		ext.Write([]byte{0x00, 0x05, 0x00, 0x05, 0x01, 0x00, 0x00, 0x00, 0x00})
+		ext.Write([]byte{0x00, 0x12, 0x00, 0x00})
+		ext.Write([]byte{0x75, 0x50, 0x00, 0x00})
+		ext.Write([]byte{0x00, 0x0b, 0x00, 0x02, 0x01, 0x00})
+		ext.Write([]byte{0x00, 0x0a, 0x00, 0x06, 0x00, 0x04, 0x00, 0x17, 0x00, 0x18})
+
+		binary.Write(data, binary.BigEndian, uint16(ext.Len()))
+		data.ReadFrom(ext)
+
+		ret := pool.GetBuffer()
+		defer pool.PutBuffer(ret)
+
+		ret.Write([]byte{0x16, 3, 1})
+		binary.Write(ret, binary.BigEndian, uint16(data.Len()+4))
+		ret.Write([]byte{1, 0})
+		binary.Write(ret, binary.BigEndian, uint16(data.Len()))
+		ret.ReadFrom(data)
+
+		_, err := c.Conn.Write(ret.Bytes())
+		if err != nil {
+			return 0, err
+		}
+		return length, nil
+	} else if c.handshakeStatus == 1 && len(b) == 0 {
+		buf := pool.GetBuffer()
+		defer pool.PutBuffer(buf)
+
+		buf.Write([]byte{0x14, 3, 3, 0, 1, 1, 0x16, 3, 3, 0, 0x20})
+		tools.AppendRandBytes(buf, 22)
+		buf.Write(c.hmacSHA1(buf.Bytes())[:10])
+		buf.ReadFrom(&c.sendBuf)
+
+		c.handshakeStatus = 8
+
+		_, err := c.Conn.Write(buf.Bytes())
+		return 0, err
+	}
+	return length, nil
+}
+
+func packData(buf *bytes.Buffer, data []byte) {
+	buf.Write([]byte{0x17, 3, 3})
+	binary.Write(buf, binary.BigEndian, uint16(len(data)))
+	buf.Write(data)
+}
+
+func (t *tls12Ticket) packAuthData(buf *bytes.Buffer) {
+	binary.Write(buf, binary.BigEndian, uint32(time.Now().Unix()))
+	tools.AppendRandBytes(buf, 18)
+	buf.Write(t.hmacSHA1(buf.Bytes()[buf.Len()-22:])[:10])
+}
+
+func packSNIData(buf *bytes.Buffer, u string) {
+	len := uint16(len(u))
+	buf.Write([]byte{0, 0})
+	binary.Write(buf, binary.BigEndian, len+5)
+	binary.Write(buf, binary.BigEndian, len+3)
+	buf.WriteByte(0)
+	binary.Write(buf, binary.BigEndian, len)
+	buf.WriteString(u)
+}
+
+func (c *tls12TicketConn) packTicketBuf(buf *bytes.Buffer, u string) {
+	length := 16 * (rand.Intn(17) + 8)
+	buf.Write([]byte{0, 0x23})
+	binary.Write(buf, binary.BigEndian, uint16(length))
+	tools.AppendRandBytes(buf, length)
+}
+
+func (t *tls12Ticket) hmacSHA1(data []byte) []byte {
+	key := pool.Get(len(t.Key) + 32)
+	defer pool.Put(key)
+	copy(key, t.Key)
+	copy(key[len(t.Key):], t.clientID[:])
+
+	sha1Data := tools.HmacSHA1(key, data)
+	return sha1Data[:10]
+}
+
+func (t *tls12Ticket) getHost() string {
+	host := t.Param
+	if len(host) == 0 {
+		host = t.Host
+	}
+	if len(host) > 0 && host[len(host)-1] >= '0' && host[len(host)-1] <= '9' {
+		host = ""
+	}
+	hosts := strings.Split(host, ",")
+	host = hosts[rand.Intn(len(hosts))]
+	return host
+}
diff --git a/transport/clashssr/protocol/auth_aes128_md5.go b/transport/clashssr/protocol/auth_aes128_md5.go
new file mode 100644
index 00000000..d3bc9417
--- /dev/null
+++ b/transport/clashssr/protocol/auth_aes128_md5.go
@@ -0,0 +1,18 @@
+package protocol
+
+import "github.com/Dreamacro/clash/transport/ssr/tools"
+
+func init() {
+	register("auth_aes128_md5", newAuthAES128MD5, 9)
+}
+
+func newAuthAES128MD5(b *Base) Protocol {
+	a := &authAES128{
+		Base:               b,
+		authData:           &authData{},
+		authAES128Function: &authAES128Function{salt: "auth_aes128_md5", hmac: tools.HmacMD5, hashDigest: tools.MD5Sum},
+		userData:           &userData{},
+	}
+	a.initUserData()
+	return a
+}
diff --git a/transport/clashssr/protocol/auth_aes128_sha1.go b/transport/clashssr/protocol/auth_aes128_sha1.go
new file mode 100644
index 00000000..99c2f6f8
--- /dev/null
+++ b/transport/clashssr/protocol/auth_aes128_sha1.go
@@ -0,0 +1,277 @@
+package protocol
+
+import (
+	"bytes"
+	"encoding/binary"
+	"math"
+	"math/rand"
+	"net"
+	"strconv"
+	"strings"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/transport/ssr/tools"
+)
+
+type (
+	hmacMethod       func(key, data []byte) []byte
+	hashDigestMethod func([]byte) []byte
+)
+
+func init() {
+	register("auth_aes128_sha1", newAuthAES128SHA1, 9)
+}
+
+type authAES128Function struct {
+	salt       string
+	hmac       hmacMethod
+	hashDigest hashDigestMethod
+}
+
+type authAES128 struct {
+	*Base
+	*authData
+	*authAES128Function
+	*userData
+	iv            []byte
+	hasSentHeader bool
+	rawTrans      bool
+	packID        uint32
+	recvID        uint32
+}
+
+func newAuthAES128SHA1(b *Base) Protocol {
+	a := &authAES128{
+		Base:               b,
+		authData:           &authData{},
+		authAES128Function: &authAES128Function{salt: "auth_aes128_sha1", hmac: tools.HmacSHA1, hashDigest: tools.SHA1Sum},
+		userData:           &userData{},
+	}
+	a.initUserData()
+	return a
+}
+
+func (a *authAES128) initUserData() {
+	params := strings.Split(a.Param, ":")
+	if len(params) > 1 {
+		if userID, err := strconv.ParseUint(params[0], 10, 32); err == nil {
+			binary.LittleEndian.PutUint32(a.userID[:], uint32(userID))
+			a.userKey = a.hashDigest([]byte(params[1]))
+		}
+	}
+	if len(a.userKey) == 0 {
+		a.userKey = a.Key
+		rand.Read(a.userID[:])
+	}
+}
+
+func (a *authAES128) StreamConn(c net.Conn, iv []byte) net.Conn {
+	p := &authAES128{
+		Base:               a.Base,
+		authData:           a.next(),
+		authAES128Function: a.authAES128Function,
+		userData:           a.userData,
+		packID:             1,
+		recvID:             1,
+	}
+	p.iv = iv
+	return &Conn{Conn: c, Protocol: p}
+}
+
+func (a *authAES128) PacketConn(c net.PacketConn) net.PacketConn {
+	p := &authAES128{
+		Base:               a.Base,
+		authAES128Function: a.authAES128Function,
+		userData:           a.userData,
+	}
+	return &PacketConn{PacketConn: c, Protocol: p}
+}
+
+func (a *authAES128) Decode(dst, src *bytes.Buffer) error {
+	if a.rawTrans {
+		dst.ReadFrom(src)
+		return nil
+	}
+	for src.Len() > 4 {
+		macKey := pool.Get(len(a.userKey) + 4)
+		defer pool.Put(macKey)
+		copy(macKey, a.userKey)
+		binary.LittleEndian.PutUint32(macKey[len(a.userKey):], a.recvID)
+		if !bytes.Equal(a.hmac(macKey, src.Bytes()[:2])[:2], src.Bytes()[2:4]) {
+			src.Reset()
+			return errAuthAES128MACError
+		}
+
+		length := int(binary.LittleEndian.Uint16(src.Bytes()[:2]))
+		if length >= 8192 || length < 7 {
+			a.rawTrans = true
+			src.Reset()
+			return errAuthAES128LengthError
+		}
+		if length > src.Len() {
+			break
+		}
+
+		if !bytes.Equal(a.hmac(macKey, src.Bytes()[:length-4])[:4], src.Bytes()[length-4:length]) {
+			a.rawTrans = true
+			src.Reset()
+			return errAuthAES128ChksumError
+		}
+
+		a.recvID++
+
+		pos := int(src.Bytes()[4])
+		if pos < 255 {
+			pos += 4
+		} else {
+			pos = int(binary.LittleEndian.Uint16(src.Bytes()[5:7])) + 4
+		}
+		dst.Write(src.Bytes()[pos : length-4])
+		src.Next(length)
+	}
+	return nil
+}
+
+func (a *authAES128) Encode(buf *bytes.Buffer, b []byte) error {
+	fullDataLength := len(b)
+	if !a.hasSentHeader {
+		dataLength := getDataLength(b)
+		a.packAuthData(buf, b[:dataLength])
+		b = b[dataLength:]
+		a.hasSentHeader = true
+	}
+	for len(b) > 8100 {
+		a.packData(buf, b[:8100], fullDataLength)
+		b = b[8100:]
+	}
+	if len(b) > 0 {
+		a.packData(buf, b, fullDataLength)
+	}
+	return nil
+}
+
+func (a *authAES128) DecodePacket(b []byte) ([]byte, error) {
+	if len(b) < 4 {
+		return nil, errAuthAES128LengthError
+	}
+	if !bytes.Equal(a.hmac(a.Key, b[:len(b)-4])[:4], b[len(b)-4:]) {
+		return nil, errAuthAES128ChksumError
+	}
+	return b[:len(b)-4], nil
+}
+
+func (a *authAES128) EncodePacket(buf *bytes.Buffer, b []byte) error {
+	buf.Write(b)
+	buf.Write(a.userID[:])
+	buf.Write(a.hmac(a.userKey, buf.Bytes())[:4])
+	return nil
+}
+
+func (a *authAES128) packData(poolBuf *bytes.Buffer, data []byte, fullDataLength int) {
+	dataLength := len(data)
+	randDataLength := a.getRandDataLengthForPackData(dataLength, fullDataLength)
+	/*
+		2:	uint16 LittleEndian packedDataLength
+		2:	hmac of packedDataLength
+		3:	maxRandDataLengthPrefix (min:1)
+		4:	hmac of packedData except the last 4 bytes
+	*/
+	packedDataLength := 2 + 2 + 3 + randDataLength + dataLength + 4
+	if randDataLength < 128 {
+		packedDataLength -= 2
+	}
+
+	macKey := pool.Get(len(a.userKey) + 4)
+	defer pool.Put(macKey)
+	copy(macKey, a.userKey)
+	binary.LittleEndian.PutUint32(macKey[len(a.userKey):], a.packID)
+	a.packID++
+
+	binary.Write(poolBuf, binary.LittleEndian, uint16(packedDataLength))
+	poolBuf.Write(a.hmac(macKey, poolBuf.Bytes()[poolBuf.Len()-2:])[:2])
+	a.packRandData(poolBuf, randDataLength)
+	poolBuf.Write(data)
+	poolBuf.Write(a.hmac(macKey, poolBuf.Bytes()[poolBuf.Len()-packedDataLength+4:])[:4])
+}
+
+func trapezoidRandom(max int, d float64) int {
+	base := rand.Float64()
+	if d-0 > 1e-6 {
+		a := 1 - d
+		base = (math.Sqrt(a*a+4*d*base) - a) / (2 * d)
+	}
+	return int(base * float64(max))
+}
+
+func (a *authAES128) getRandDataLengthForPackData(dataLength, fullDataLength int) int {
+	if fullDataLength >= 32*1024-a.Overhead {
+		return 0
+	}
+	// 1460: tcp_mss
+	revLength := 1460 - dataLength - 9
+	if revLength == 0 {
+		return 0
+	}
+	if revLength < 0 {
+		if revLength > -1460 {
+			return trapezoidRandom(revLength+1460, -0.3)
+		}
+		return rand.Intn(32)
+	}
+	if dataLength > 900 {
+		return rand.Intn(revLength)
+	}
+	return trapezoidRandom(revLength, -0.3)
+}
+
+func (a *authAES128) packAuthData(poolBuf *bytes.Buffer, data []byte) {
+	if len(data) == 0 {
+		return
+	}
+	dataLength := len(data)
+	randDataLength := a.getRandDataLengthForPackAuthData(dataLength)
+	/*
+		7:	checkHead(1) and hmac of checkHead(6)
+		4:	userID
+		16:	encrypted data of authdata(12), uint16 BigEndian packedDataLength(2) and uint16 BigEndian randDataLength(2)
+		4:	hmac of userID and encrypted data
+		4:	hmac of packedAuthData except the last 4 bytes
+	*/
+	packedAuthDataLength := 7 + 4 + 16 + 4 + randDataLength + dataLength + 4
+
+	macKey := pool.Get(len(a.iv) + len(a.Key))
+	defer pool.Put(macKey)
+	copy(macKey, a.iv)
+	copy(macKey[len(a.iv):], a.Key)
+
+	poolBuf.WriteByte(byte(rand.Intn(256)))
+	poolBuf.Write(a.hmac(macKey, poolBuf.Bytes())[:6])
+	poolBuf.Write(a.userID[:])
+	err := a.authData.putEncryptedData(poolBuf, a.userKey, [2]int{packedAuthDataLength, randDataLength}, a.salt)
+	if err != nil {
+		poolBuf.Reset()
+		return
+	}
+	poolBuf.Write(a.hmac(macKey, poolBuf.Bytes()[7:])[:4])
+	tools.AppendRandBytes(poolBuf, randDataLength)
+	poolBuf.Write(data)
+	poolBuf.Write(a.hmac(a.userKey, poolBuf.Bytes())[:4])
+}
+
+func (a *authAES128) getRandDataLengthForPackAuthData(size int) int {
+	if size > 400 {
+		return rand.Intn(512)
+	}
+	return rand.Intn(1024)
+}
+
+func (a *authAES128) packRandData(poolBuf *bytes.Buffer, size int) {
+	if size < 128 {
+		poolBuf.WriteByte(byte(size + 1))
+		tools.AppendRandBytes(poolBuf, size)
+		return
+	}
+	poolBuf.WriteByte(255)
+	binary.Write(poolBuf, binary.LittleEndian, uint16(size+3))
+	tools.AppendRandBytes(poolBuf, size)
+}
diff --git a/transport/clashssr/protocol/auth_chain_a.go b/transport/clashssr/protocol/auth_chain_a.go
new file mode 100644
index 00000000..0cbdfd70
--- /dev/null
+++ b/transport/clashssr/protocol/auth_chain_a.go
@@ -0,0 +1,306 @@
+package protocol
+
+import (
+	"bytes"
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/rc4"
+	"encoding/base64"
+	"encoding/binary"
+	"net"
+	"strconv"
+	"strings"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/transport/shadowsocks/core"
+	"github.com/Dreamacro/clash/transport/ssr/tools"
+)
+
+func init() {
+	register("auth_chain_a", newAuthChainA, 4)
+}
+
+type randDataLengthMethod func(int, []byte, *tools.XorShift128Plus) int
+
+type authChainA struct {
+	*Base
+	*authData
+	*userData
+	iv             []byte
+	salt           string
+	hasSentHeader  bool
+	rawTrans       bool
+	lastClientHash []byte
+	lastServerHash []byte
+	encrypter      cipher.Stream
+	decrypter      cipher.Stream
+	randomClient   tools.XorShift128Plus
+	randomServer   tools.XorShift128Plus
+	randDataLength randDataLengthMethod
+	packID         uint32
+	recvID         uint32
+}
+
+func newAuthChainA(b *Base) Protocol {
+	a := &authChainA{
+		Base:     b,
+		authData: &authData{},
+		userData: &userData{},
+		salt:     "auth_chain_a",
+	}
+	a.initUserData()
+	return a
+}
+
+func (a *authChainA) initUserData() {
+	params := strings.Split(a.Param, ":")
+	if len(params) > 1 {
+		if userID, err := strconv.ParseUint(params[0], 10, 32); err == nil {
+			binary.LittleEndian.PutUint32(a.userID[:], uint32(userID))
+			a.userKey = []byte(params[1])
+		}
+	}
+	if len(a.userKey) == 0 {
+		a.userKey = a.Key
+		rand.Read(a.userID[:])
+	}
+}
+
+func (a *authChainA) StreamConn(c net.Conn, iv []byte) net.Conn {
+	p := &authChainA{
+		Base:     a.Base,
+		authData: a.next(),
+		userData: a.userData,
+		salt:     a.salt,
+		packID:   1,
+		recvID:   1,
+	}
+	p.iv = iv
+	p.randDataLength = p.getRandLength
+	return &Conn{Conn: c, Protocol: p}
+}
+
+func (a *authChainA) PacketConn(c net.PacketConn) net.PacketConn {
+	p := &authChainA{
+		Base:     a.Base,
+		salt:     a.salt,
+		userData: a.userData,
+	}
+	return &PacketConn{PacketConn: c, Protocol: p}
+}
+
+func (a *authChainA) Decode(dst, src *bytes.Buffer) error {
+	if a.rawTrans {
+		dst.ReadFrom(src)
+		return nil
+	}
+	for src.Len() > 4 {
+		macKey := pool.Get(len(a.userKey) + 4)
+		defer pool.Put(macKey)
+		copy(macKey, a.userKey)
+		binary.LittleEndian.PutUint32(macKey[len(a.userKey):], a.recvID)
+
+		dataLength := int(binary.LittleEndian.Uint16(src.Bytes()[:2]) ^ binary.LittleEndian.Uint16(a.lastServerHash[14:16]))
+		randDataLength := a.randDataLength(dataLength, a.lastServerHash, &a.randomServer)
+		length := dataLength + randDataLength
+
+		if length >= 4096 {
+			a.rawTrans = true
+			src.Reset()
+			return errAuthChainLengthError
+		}
+
+		if 4+length > src.Len() {
+			break
+		}
+
+		serverHash := tools.HmacMD5(macKey, src.Bytes()[:length+2])
+		if !bytes.Equal(serverHash[:2], src.Bytes()[length+2:length+4]) {
+			a.rawTrans = true
+			src.Reset()
+			return errAuthChainChksumError
+		}
+		a.lastServerHash = serverHash
+
+		pos := 2
+		if dataLength > 0 && randDataLength > 0 {
+			pos += getRandStartPos(randDataLength, &a.randomServer)
+		}
+		wantedData := src.Bytes()[pos : pos+dataLength]
+		a.decrypter.XORKeyStream(wantedData, wantedData)
+		if a.recvID == 1 {
+			dst.Write(wantedData[2:])
+		} else {
+			dst.Write(wantedData)
+		}
+		a.recvID++
+		src.Next(length + 4)
+	}
+	return nil
+}
+
+func (a *authChainA) Encode(buf *bytes.Buffer, b []byte) error {
+	if !a.hasSentHeader {
+		dataLength := getDataLength(b)
+		a.packAuthData(buf, b[:dataLength])
+		b = b[dataLength:]
+		a.hasSentHeader = true
+	}
+	for len(b) > 2800 {
+		a.packData(buf, b[:2800])
+		b = b[2800:]
+	}
+	if len(b) > 0 {
+		a.packData(buf, b)
+	}
+	return nil
+}
+
+func (a *authChainA) DecodePacket(b []byte) ([]byte, error) {
+	if len(b) < 9 {
+		return nil, errAuthChainLengthError
+	}
+	if !bytes.Equal(tools.HmacMD5(a.userKey, b[:len(b)-1])[:1], b[len(b)-1:]) {
+		return nil, errAuthChainChksumError
+	}
+	md5Data := tools.HmacMD5(a.Key, b[len(b)-8:len(b)-1])
+
+	randDataLength := udpGetRandLength(md5Data, &a.randomServer)
+
+	key := core.Kdf(base64.StdEncoding.EncodeToString(a.userKey)+base64.StdEncoding.EncodeToString(md5Data), 16)
+	rc4Cipher, err := rc4.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	wantedData := b[:len(b)-8-randDataLength]
+	rc4Cipher.XORKeyStream(wantedData, wantedData)
+	return wantedData, nil
+}
+
+func (a *authChainA) EncodePacket(buf *bytes.Buffer, b []byte) error {
+	authData := pool.Get(3)
+	defer pool.Put(authData)
+	rand.Read(authData)
+
+	md5Data := tools.HmacMD5(a.Key, authData)
+
+	randDataLength := udpGetRandLength(md5Data, &a.randomClient)
+
+	key := core.Kdf(base64.StdEncoding.EncodeToString(a.userKey)+base64.StdEncoding.EncodeToString(md5Data), 16)
+	rc4Cipher, err := rc4.NewCipher(key)
+	if err != nil {
+		return err
+	}
+	rc4Cipher.XORKeyStream(b, b)
+
+	buf.Write(b)
+	tools.AppendRandBytes(buf, randDataLength)
+	buf.Write(authData)
+	binary.Write(buf, binary.LittleEndian, binary.LittleEndian.Uint32(a.userID[:])^binary.LittleEndian.Uint32(md5Data[:4]))
+	buf.Write(tools.HmacMD5(a.userKey, buf.Bytes())[:1])
+	return nil
+}
+
+func (a *authChainA) packAuthData(poolBuf *bytes.Buffer, data []byte) {
+	/*
+		dataLength := len(data)
+		12:	checkHead(4) and hmac of checkHead(8)
+		4:	uint32 LittleEndian uid (uid = userID ^ last client hash)
+		16:	encrypted data of authdata(12), uint16 LittleEndian overhead(2) and uint16 LittleEndian number zero(2)
+		4:	last server hash(4)
+		packedAuthDataLength := 12 + 4 + 16 + 4 + dataLength
+	*/
+
+	macKey := pool.Get(len(a.iv) + len(a.Key))
+	defer pool.Put(macKey)
+	copy(macKey, a.iv)
+	copy(macKey[len(a.iv):], a.Key)
+
+	// check head
+	tools.AppendRandBytes(poolBuf, 4)
+	a.lastClientHash = tools.HmacMD5(macKey, poolBuf.Bytes())
+	a.initRC4Cipher()
+	poolBuf.Write(a.lastClientHash[:8])
+	// uid
+	binary.Write(poolBuf, binary.LittleEndian, binary.LittleEndian.Uint32(a.userID[:])^binary.LittleEndian.Uint32(a.lastClientHash[8:12]))
+	// encrypted data
+	err := a.putEncryptedData(poolBuf, a.userKey, [2]int{a.Overhead, 0}, a.salt)
+	if err != nil {
+		poolBuf.Reset()
+		return
+	}
+	// last server hash
+	a.lastServerHash = tools.HmacMD5(a.userKey, poolBuf.Bytes()[12:])
+	poolBuf.Write(a.lastServerHash[:4])
+	// packed data
+	a.packData(poolBuf, data)
+}
+
+func (a *authChainA) packData(poolBuf *bytes.Buffer, data []byte) {
+	a.encrypter.XORKeyStream(data, data)
+
+	macKey := pool.Get(len(a.userKey) + 4)
+	defer pool.Put(macKey)
+	copy(macKey, a.userKey)
+	binary.LittleEndian.PutUint32(macKey[len(a.userKey):], a.packID)
+	a.packID++
+
+	length := uint16(len(data)) ^ binary.LittleEndian.Uint16(a.lastClientHash[14:16])
+
+	originalLength := poolBuf.Len()
+	binary.Write(poolBuf, binary.LittleEndian, length)
+	a.putMixedRandDataAndData(poolBuf, data)
+	a.lastClientHash = tools.HmacMD5(macKey, poolBuf.Bytes()[originalLength:])
+	poolBuf.Write(a.lastClientHash[:2])
+}
+
+func (a *authChainA) putMixedRandDataAndData(poolBuf *bytes.Buffer, data []byte) {
+	randDataLength := a.randDataLength(len(data), a.lastClientHash, &a.randomClient)
+	if len(data) == 0 {
+		tools.AppendRandBytes(poolBuf, randDataLength)
+		return
+	}
+	if randDataLength > 0 {
+		startPos := getRandStartPos(randDataLength, &a.randomClient)
+		tools.AppendRandBytes(poolBuf, startPos)
+		poolBuf.Write(data)
+		tools.AppendRandBytes(poolBuf, randDataLength-startPos)
+		return
+	}
+	poolBuf.Write(data)
+}
+
+func getRandStartPos(length int, random *tools.XorShift128Plus) int {
+	if length == 0 {
+		return 0
+	}
+	return int(int64(random.Next()%8589934609) % int64(length))
+}
+
+func (a *authChainA) getRandLength(length int, lastHash []byte, random *tools.XorShift128Plus) int {
+	if length > 1440 {
+		return 0
+	}
+	random.InitFromBinAndLength(lastHash, length)
+	if length > 1300 {
+		return int(random.Next() % 31)
+	}
+	if length > 900 {
+		return int(random.Next() % 127)
+	}
+	if length > 400 {
+		return int(random.Next() % 521)
+	}
+	return int(random.Next() % 1021)
+}
+
+func (a *authChainA) initRC4Cipher() {
+	key := core.Kdf(base64.StdEncoding.EncodeToString(a.userKey)+base64.StdEncoding.EncodeToString(a.lastClientHash), 16)
+	a.encrypter, _ = rc4.NewCipher(key)
+	a.decrypter, _ = rc4.NewCipher(key)
+}
+
+func udpGetRandLength(lastHash []byte, random *tools.XorShift128Plus) int {
+	random.InitFromBin(lastHash)
+	return int(random.Next() % 127)
+}
diff --git a/transport/clashssr/protocol/auth_chain_b.go b/transport/clashssr/protocol/auth_chain_b.go
new file mode 100644
index 00000000..857b2a3a
--- /dev/null
+++ b/transport/clashssr/protocol/auth_chain_b.go
@@ -0,0 +1,97 @@
+package protocol
+
+import (
+	"net"
+	"sort"
+
+	"github.com/Dreamacro/clash/transport/ssr/tools"
+)
+
+func init() {
+	register("auth_chain_b", newAuthChainB, 4)
+}
+
+type authChainB struct {
+	*authChainA
+	dataSizeList  []int
+	dataSizeList2 []int
+}
+
+func newAuthChainB(b *Base) Protocol {
+	a := &authChainB{
+		authChainA: &authChainA{
+			Base:     b,
+			authData: &authData{},
+			userData: &userData{},
+			salt:     "auth_chain_b",
+		},
+	}
+	a.initUserData()
+	return a
+}
+
+func (a *authChainB) StreamConn(c net.Conn, iv []byte) net.Conn {
+	p := &authChainB{
+		authChainA: &authChainA{
+			Base:     a.Base,
+			authData: a.next(),
+			userData: a.userData,
+			salt:     a.salt,
+			packID:   1,
+			recvID:   1,
+		},
+	}
+	p.iv = iv
+	p.randDataLength = p.getRandLength
+	p.initDataSize()
+	return &Conn{Conn: c, Protocol: p}
+}
+
+func (a *authChainB) initDataSize() {
+	a.dataSizeList = a.dataSizeList[:0]
+	a.dataSizeList2 = a.dataSizeList2[:0]
+
+	a.randomServer.InitFromBin(a.Key)
+	length := a.randomServer.Next()%8 + 4
+	for ; length > 0; length-- {
+		a.dataSizeList = append(a.dataSizeList, int(a.randomServer.Next()%2340%2040%1440))
+	}
+	sort.Ints(a.dataSizeList)
+
+	length = a.randomServer.Next()%16 + 8
+	for ; length > 0; length-- {
+		a.dataSizeList2 = append(a.dataSizeList2, int(a.randomServer.Next()%2340%2040%1440))
+	}
+	sort.Ints(a.dataSizeList2)
+}
+
+func (a *authChainB) getRandLength(length int, lashHash []byte, random *tools.XorShift128Plus) int {
+	if length >= 1440 {
+		return 0
+	}
+	random.InitFromBinAndLength(lashHash, length)
+	pos := sort.Search(len(a.dataSizeList), func(i int) bool { return a.dataSizeList[i] >= length+a.Overhead })
+	finalPos := pos + int(random.Next()%uint64(len(a.dataSizeList)))
+	if finalPos < len(a.dataSizeList) {
+		return a.dataSizeList[finalPos] - length - a.Overhead
+	}
+
+	pos = sort.Search(len(a.dataSizeList2), func(i int) bool { return a.dataSizeList2[i] >= length+a.Overhead })
+	finalPos = pos + int(random.Next()%uint64(len(a.dataSizeList2)))
+	if finalPos < len(a.dataSizeList2) {
+		return a.dataSizeList2[finalPos] - length - a.Overhead
+	}
+	if finalPos < pos+len(a.dataSizeList2)-1 {
+		return 0
+	}
+	if length > 1300 {
+		return int(random.Next() % 31)
+	}
+	if length > 900 {
+		return int(random.Next() % 127)
+	}
+	if length > 400 {
+		return int(random.Next() % 521)
+	}
+	return int(random.Next() % 1021)
+}
diff --git a/transport/clashssr/protocol/auth_sha1_v4.go b/transport/clashssr/protocol/auth_sha1_v4.go
new file mode 100644
index 00000000..30392c9e
--- /dev/null
+++ b/transport/clashssr/protocol/auth_sha1_v4.go
@@ -0,0 +1,182 @@
+package protocol
+
+import (
+	"bytes"
+	"encoding/binary"
+	"hash/adler32"
+	"hash/crc32"
+	"math/rand"
+	"net"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/transport/ssr/tools"
+)
+
+func init() {
+	register("auth_sha1_v4", newAuthSHA1V4, 7)
+}
+
+type authSHA1V4 struct {
+	*Base
+	*authData
+	iv            []byte
+	hasSentHeader bool
+	rawTrans      bool
+}
+
+func newAuthSHA1V4(b *Base) Protocol {
+	return &authSHA1V4{Base: b, authData: &authData{}}
+}
+
+func (a *authSHA1V4) StreamConn(c net.Conn, iv []byte) net.Conn {
+	p := &authSHA1V4{Base: a.Base, authData: a.next()}
+	p.iv = iv
+	return &Conn{Conn: c, Protocol: p}
+}
+
+func (a *authSHA1V4) PacketConn(c net.PacketConn) net.PacketConn {
+	return c
+}
+
+func (a *authSHA1V4) Decode(dst, src *bytes.Buffer) error {
+	if a.rawTrans {
+		dst.ReadFrom(src)
+		return nil
+	}
+	for src.Len() > 4 {
+		if uint16(crc32.ChecksumIEEE(src.Bytes()[:2])&0xffff) != binary.LittleEndian.Uint16(src.Bytes()[2:4]) {
+			src.Reset()
+			return errAuthSHA1V4CRC32Error
+		}
+
+		length := int(binary.BigEndian.Uint16(src.Bytes()[:2]))
+		if length >= 8192 || length < 7 {
+			a.rawTrans = true
+			src.Reset()
+			return errAuthSHA1V4LengthError
+		}
+		if length > src.Len() {
+			break
+		}
+
+		if adler32.Checksum(src.Bytes()[:length-4]) != binary.LittleEndian.Uint32(src.Bytes()[length-4:length]) {
+			a.rawTrans = true
+			src.Reset()
+			return errAuthSHA1V4Adler32Error
+		}
+
+		pos := int(src.Bytes()[4])
+		if pos < 255 {
+			pos += 4
+		} else {
+			pos = int(binary.BigEndian.Uint16(src.Bytes()[5:7])) + 4
+		}
+		dst.Write(src.Bytes()[pos : length-4])
+		src.Next(length)
+	}
+	return nil
+}
+
+func (a *authSHA1V4) Encode(buf *bytes.Buffer, b []byte) error {
+	if !a.hasSentHeader {
+		dataLength := getDataLength(b)
+
+		a.packAuthData(buf, b[:dataLength])
+		b = b[dataLength:]
+
+		a.hasSentHeader = true
+	}
+	for len(b) > 8100 {
+		a.packData(buf, b[:8100])
+		b = b[8100:]
+	}
+	if len(b) > 0 {
+		a.packData(buf, b)
+	}
+
+	return nil
+}
+
+func (a *authSHA1V4) DecodePacket(b []byte) ([]byte, error) { return b, nil }
+
+func (a *authSHA1V4) EncodePacket(buf *bytes.Buffer, b []byte) error {
+	buf.Write(b)
+	return nil
+}
+
+func (a *authSHA1V4) packData(poolBuf *bytes.Buffer, data []byte) {
+	dataLength := len(data)
+	randDataLength := a.getRandDataLength(dataLength)
+	/*
+		2:	uint16 BigEndian packedDataLength
+		2:	uint16 LittleEndian crc32Data & 0xffff
+		3:	maxRandDataLengthPrefix (min:1)
+		4:	adler32Data
+	*/
+	packedDataLength := 2 + 2 + 3 + randDataLength + dataLength + 4
+	if randDataLength < 128 {
+		packedDataLength -= 2
+	}
+
+	binary.Write(poolBuf, binary.BigEndian, uint16(packedDataLength))
+	binary.Write(poolBuf, binary.LittleEndian, uint16(crc32.ChecksumIEEE(poolBuf.Bytes()[poolBuf.Len()-2:])&0xffff))
+	a.packRandData(poolBuf, randDataLength)
+	poolBuf.Write(data)
+	binary.Write(poolBuf, binary.LittleEndian, adler32.Checksum(poolBuf.Bytes()[poolBuf.Len()-packedDataLength+4:]))
+}
+
+func (a *authSHA1V4) packAuthData(poolBuf *bytes.Buffer, data []byte) {
+	dataLength := len(data)
+	randDataLength := a.getRandDataLength(12 + dataLength)
+	/*
+		2:	uint16 BigEndian packedAuthDataLength
+		4:	uint32 LittleEndian crc32Data
+		3:	maxRandDataLengthPrefix (min: 1)
+		12:	authDataLength
+		10:	hmacSHA1DataLength
+	*/
+	packedAuthDataLength := 2 + 4 + 3 + randDataLength + 12 + dataLength + 10
+	if randDataLength < 128 {
+		packedAuthDataLength -= 2
+	}
+
+	salt := []byte("auth_sha1_v4")
+	crcData := pool.Get(len(salt) + len(a.Key) + 2)
+	defer pool.Put(crcData)
+	binary.BigEndian.PutUint16(crcData, uint16(packedAuthDataLength))
+	copy(crcData[2:], salt)
+	copy(crcData[2+len(salt):], a.Key)
+
+	key := pool.Get(len(a.iv) + len(a.Key))
+	defer pool.Put(key)
+	copy(key, a.iv)
+	copy(key[len(a.iv):], a.Key)
+
+	poolBuf.Write(crcData[:2])
+	binary.Write(poolBuf, binary.LittleEndian, crc32.ChecksumIEEE(crcData))
+	a.packRandData(poolBuf, randDataLength)
+	a.putAuthData(poolBuf)
+	poolBuf.Write(data)
+	poolBuf.Write(tools.HmacSHA1(key, poolBuf.Bytes()[poolBuf.Len()-packedAuthDataLength+10:])[:10])
+}
+
+func (a *authSHA1V4) packRandData(poolBuf *bytes.Buffer, size int) {
+	if size < 128 {
+		poolBuf.WriteByte(byte(size + 1))
+		tools.AppendRandBytes(poolBuf, size)
+		return
+	}
+	poolBuf.WriteByte(255)
+	binary.Write(poolBuf, binary.BigEndian, uint16(size+3))
+	tools.AppendRandBytes(poolBuf, size)
+}
+
+func (a *authSHA1V4) getRandDataLength(size int) int {
+	if size > 1200 {
+		return 0
+	}
+	if size > 400 {
+		return rand.Intn(256)
+	}
+	return rand.Intn(512)
+}
diff --git a/transport/clashssr/protocol/base.go b/transport/clashssr/protocol/base.go
new file mode 100644
index 00000000..e187fcb7
--- /dev/null
+++ b/transport/clashssr/protocol/base.go
@@ -0,0 +1,75 @@
+package protocol
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"encoding/base64"
+	"encoding/binary"
+	"math/rand"
+	"sync"
+	"time"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/transport/shadowsocks/core"
+)
+
+type Base struct {
+	Key      []byte
+	Overhead int
+	Param    string
+}
+
+type userData struct {
+	userKey []byte
+	userID  [4]byte
+}
+
+type authData struct {
+	clientID     [4]byte
+	connectionID uint32
+	mutex        sync.Mutex
+}
+
+func (a *authData) next() *authData {
+	r := &authData{}
+	a.mutex.Lock()
+	defer a.mutex.Unlock()
+	if a.connectionID > 0xff000000 || a.connectionID == 0 {
+		rand.Read(a.clientID[:])
+		a.connectionID = rand.Uint32() & 0xffffff
+	}
+	a.connectionID++
+	copy(r.clientID[:], a.clientID[:])
+	r.connectionID = a.connectionID
+	return r
+}
+
+func (a *authData) putAuthData(buf *bytes.Buffer) {
+	binary.Write(buf, binary.LittleEndian, uint32(time.Now().Unix()))
+	buf.Write(a.clientID[:])
+	binary.Write(buf, binary.LittleEndian, a.connectionID)
+}
+
+func (a *authData) putEncryptedData(b *bytes.Buffer, userKey []byte, paddings [2]int, salt string) error {
+	encrypt := pool.Get(16)
+	defer pool.Put(encrypt)
+	binary.LittleEndian.PutUint32(encrypt, uint32(time.Now().Unix()))
+	copy(encrypt[4:], a.clientID[:])
+	binary.LittleEndian.PutUint32(encrypt[8:], a.connectionID)
+	binary.LittleEndian.PutUint16(encrypt[12:], uint16(paddings[0]))
+	binary.LittleEndian.PutUint16(encrypt[14:], uint16(paddings[1]))
+
+	cipherKey := core.Kdf(base64.StdEncoding.EncodeToString(userKey)+salt, 16)
+	block, err := aes.NewCipher(cipherKey)
+	if err != nil {
+		return err
+	}
+	iv := bytes.Repeat([]byte{0}, 16)
+	cbcCipher := cipher.NewCBCEncrypter(block, iv)
+
+	cbcCipher.CryptBlocks(encrypt, encrypt)
+
+	b.Write(encrypt)
+	return nil
+}
diff --git a/transport/clashssr/protocol/origin.go b/transport/clashssr/protocol/origin.go
new file mode 100644
index 00000000..80fdfa9a
--- /dev/null
+++ b/transport/clashssr/protocol/origin.go
@@ -0,0 +1,33 @@
+package protocol
+
+import (
+	"bytes"
+	"net"
+)
+
+type origin struct{}
+
+func init() { register("origin", newOrigin, 0) }
+
+func newOrigin(b *Base) Protocol { return &origin{} }
+
+func (o *origin) StreamConn(c net.Conn, iv []byte) net.Conn { return c }
+
+func (o *origin) PacketConn(c net.PacketConn) net.PacketConn { return c }
+
+func (o *origin) Decode(dst, src *bytes.Buffer) error {
+	dst.ReadFrom(src)
+	return nil
+}
+
+func (o *origin) Encode(buf *bytes.Buffer, b []byte) error {
+	buf.Write(b)
+	return nil
+}
+
+func (o *origin) DecodePacket(b []byte) ([]byte, error) { return b, nil }
+
+func (o *origin) EncodePacket(buf *bytes.Buffer, b []byte) error {
+	buf.Write(b)
+	return nil
+}
diff --git a/transport/clashssr/protocol/packet.go b/transport/clashssr/protocol/packet.go
new file mode 100644
index 00000000..249db70a
--- /dev/null
+++ b/transport/clashssr/protocol/packet.go
@@ -0,0 +1,36 @@
+package protocol
+
+import (
+	"net"
+
+	"github.com/Dreamacro/clash/common/pool"
+)
+
+type PacketConn struct {
+	net.PacketConn
+	Protocol
+}
+
+func (c *PacketConn) WriteTo(b []byte, addr net.Addr) (int, error) {
+	buf := pool.GetBuffer()
+	defer pool.PutBuffer(buf)
+	err := c.EncodePacket(buf, b)
+	if err != nil {
+		return 0, err
+	}
+	_, err = c.PacketConn.WriteTo(buf.Bytes(), addr)
+	return len(b), err
+}
+
+func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, addr, err := c.PacketConn.ReadFrom(b)
+	if err != nil {
+		return n, addr, err
+	}
+	decoded, err := c.DecodePacket(b[:n])
+	if err != nil {
+		return n, addr, err
+	}
+	copy(b, decoded)
+	return len(decoded), addr, nil
+}
diff --git a/transport/clashssr/protocol/protocol.go b/transport/clashssr/protocol/protocol.go
new file mode 100644
index 00000000..41bd984c
--- /dev/null
+++ b/transport/clashssr/protocol/protocol.go
@@ -0,0 +1,76 @@
+package protocol
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"math/rand"
+	"net"
+)
+
+var (
+	errAuthSHA1V4CRC32Error   = errors.New("auth_sha1_v4 decode data wrong crc32")
+	errAuthSHA1V4LengthError  = errors.New("auth_sha1_v4 decode data wrong length")
+	errAuthSHA1V4Adler32Error = errors.New("auth_sha1_v4 decode data wrong adler32")
+	errAuthAES128MACError     = errors.New("auth_aes128 decode data wrong mac")
+	errAuthAES128LengthError  = errors.New("auth_aes128 decode data wrong length")
+	errAuthAES128ChksumError  = errors.New("auth_aes128 decode data wrong checksum")
+	errAuthChainLengthError   = errors.New("auth_chain decode data wrong length")
+	errAuthChainChksumError   = errors.New("auth_chain decode data wrong checksum")
+)
+
+type Protocol interface {
+	StreamConn(net.Conn, []byte) net.Conn
+	PacketConn(net.PacketConn) net.PacketConn
+	Decode(dst, src *bytes.Buffer) error
+	Encode(buf *bytes.Buffer, b []byte) error
+	DecodePacket([]byte) ([]byte, error)
+	EncodePacket(buf *bytes.Buffer, b []byte) error
+}
+
+type protocolCreator func(b *Base) Protocol
+
+var protocolList = make(map[string]struct {
+	overhead int
+	new      protocolCreator
+})
+
+func register(name string, c protocolCreator, o int) {
+	protocolList[name] = struct {
+		overhead int
+		new      protocolCreator
+	}{overhead: o, new: c}
+}
+
+func PickProtocol(name string, b *Base) (Protocol, error) {
+	if choice, ok := protocolList[name]; ok {
+		b.Overhead += choice.overhead
+		return choice.new(b), nil
+	}
+	return nil, fmt.Errorf("protocol %s not supported", name)
+}
+
+func getHeadSize(b []byte, defaultValue int) int {
+	if len(b) < 2 {
+		return defaultValue
+	}
+	headType := b[0] & 7
+	switch headType {
+	case 1:
+		return 7
+	case 4:
+		return 19
+	case 3:
+		return 4 + int(b[1])
+	}
+	return defaultValue
+}
+
+func getDataLength(b []byte) int {
+	bLength := len(b)
+	dataLength := getHeadSize(b, 30) + rand.Intn(32)
+	if bLength < dataLength {
+		return bLength
+	}
+	return dataLength
+}
diff --git a/transport/clashssr/protocol/stream.go b/transport/clashssr/protocol/stream.go
new file mode 100644
index 00000000..3c846157
--- /dev/null
+++ b/transport/clashssr/protocol/stream.go
@@ -0,0 +1,50 @@
+package protocol
+
+import (
+	"bytes"
+	"net"
+
+	"github.com/Dreamacro/clash/common/pool"
+)
+
+type Conn struct {
+	net.Conn
+	Protocol
+	decoded      bytes.Buffer
+	underDecoded bytes.Buffer
+}
+
+func (c *Conn) Read(b []byte) (int, error) {
+	if c.decoded.Len() > 0 {
+		return c.decoded.Read(b)
+	}
+
+	buf := pool.Get(pool.RelayBufferSize)
+	defer pool.Put(buf)
+	n, err := c.Conn.Read(buf)
+	if err != nil {
+		return 0, err
+	}
+	c.underDecoded.Write(buf[:n])
+	err = c.Decode(&c.decoded, &c.underDecoded)
+	if err != nil {
+		return 0, err
+	}
+	n, _ = c.decoded.Read(b)
+	return n, nil
+}
+
+func (c *Conn) Write(b []byte) (int, error) {
+	bLength := len(b)
+	buf := pool.GetBuffer()
+	defer pool.PutBuffer(buf)
+	err := c.Encode(buf, b)
+	if err != nil {
+		return 0, err
+	}
+	_, err = c.Conn.Write(buf.Bytes())
+	if err != nil {
+		return 0, err
+	}
+	return bLength, nil
+}
-- 
2.50.1