chore: rebuild vless encryption string parsing

adapter/outbound/vless.go

@@ -3,14 +3,11 @@ package outbound
 import (
 	"context"
 	"crypto/tls"
-	"encoding/base64"
 	"errors"
 	"fmt"
 	"net"
 	"net/http"
 	"strconv"
-	"strings"
-	"time"
 
 	"github.com/metacubex/mihomo/common/convert"
 	N "github.com/metacubex/mihomo/common/net"
@@ -456,41 +453,11 @@ func NewVless(option VlessOption) (*Vless, error) {
 		option: &option,
 	}
 
-	if s := strings.SplitN(option.Encryption, "-", 4); len(s) == 4 && s[2] == "mlkem768client" {
-		var minutes uint32
-		if s[0] != "1rtt" {
-			t := strings.TrimSuffix(s[0], "min")
-			if t == s[0] {
-				return nil, fmt.Errorf("invaild vless encryption value: %s", option.Encryption)
-			}
-			var i int
-			i, err = strconv.Atoi(t)
+	v.encryption, err = encryption.NewClient(option.Encryption)
 	if err != nil {
-				return nil, fmt.Errorf("invaild vless encryption value: %s", option.Encryption)
-			}
-			minutes = uint32(i)
-		}
-		var xor uint32
-		switch s[1] {
-		case "vless":
-		case "aes128xor":
-			xor = 1
-		default:
-			return nil, fmt.Errorf("invaild vless encryption value: %s", option.Encryption)
-		}
-		var b []byte
-		b, err = base64.RawURLEncoding.DecodeString(s[3])
-		if err != nil {
-			return nil, fmt.Errorf("invaild vless encryption value: %s", option.Encryption)
-		}
-		if len(b) == encryption.MLKEM768ClientLength {
-			v.encryption = &encryption.ClientInstance{}
-			if err = v.encryption.Init(b, xor, time.Duration(minutes)*time.Minute); err != nil {
-				return nil, fmt.Errorf("failed to use mlkem768seed: %w", err)
-			}
-		} else {
-			return nil, fmt.Errorf("invaild vless encryption value: %s", option.Encryption)
+		return nil, err
 	}
+	if v.encryption != nil {
 		if option.Flow != "" {
 			return nil, errors.New(`vless "encryption" doesn't support "flow" yet`)
 		}

listener/sing_vless/server.go

@@ -2,15 +2,11 @@ package sing_vless
 
 import (
 	"context"
-	"encoding/base64"
 	"errors"
-	"fmt"
 	"net"
 	"net/http"
 	"reflect"
-	"strconv"
 	"strings"
-	"time"
 	"unsafe"
 
 	"github.com/metacubex/mihomo/adapter/inbound"
@@ -88,42 +84,11 @@ func New(config LC.VlessServer, tunnel C.Tunnel, additions ...inbound.Addition)
 
 	sl = &Listener{config: config, service: service}
 
-	if s := strings.SplitN(config.Decryption, "-", 4); len(s) == 4 && s[2] == "mlkem768seed" {
-		var minutes uint32
-		if s[0] != "1rtt" {
-			t := strings.TrimSuffix(s[0], "min")
-			if t == s[0] {
-				return nil, fmt.Errorf("invaild vless decryption value: %s", config.Decryption)
-			}
-			var i int
-			i, err = strconv.Atoi(t)
+	sl.decryption, err = encryption.NewServer(config.Decryption)
 	if err != nil {
-				return nil, fmt.Errorf("invaild vless decryption value: %s", config.Decryption)
+		return nil, err
 	}
-			minutes = uint32(i)
-		}
-		var xor uint32
-		switch s[1] {
-		case "vless":
-		case "aes128xor":
-			xor = 1
-		default:
-			return nil, fmt.Errorf("invaild vless decryption value: %s", config.Decryption)
-		}
-		var b []byte
-		b, err = base64.RawURLEncoding.DecodeString(s[3])
-		if err != nil {
-			return nil, fmt.Errorf("invaild vless decryption value: %s", config.Decryption)
-		}
-		if len(b) == encryption.MLKEM768SeedLength {
-			sl.decryption = &encryption.ServerInstance{}
-			if err = sl.decryption.Init(b, xor, time.Duration(minutes)*time.Minute); err != nil {
-				return nil, fmt.Errorf("failed to use mlkem768seed: %w", err)
-			}
-		} else {
-			return nil, fmt.Errorf("invaild vless decryption value: %s", config.Decryption)
-		}
-
+	if sl.decryption != nil {
 		defer func() { // decryption must be closed to avoid the goroutine leak
 			if err != nil {
 				_ = sl.decryption.Close()

transport/vless/encryption/factory.go

@@ -0,0 +1,99 @@
+package encryption
+
+import (
+	"encoding/base64"
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// NewClient new client from encryption string
+// maybe return a nil *ClientInstance without any error, that means don't need to encrypt
+func NewClient(encryption string) (*ClientInstance, error) {
+	switch encryption {
+	case "", "none": // We will not reject empty string like xray-core does, because we need to ensure compatibility
+		return nil, nil
+	}
+	if s := strings.SplitN(encryption, "-", 4); len(s) == 4 && s[2] == "mlkem768client" {
+		var minutes uint32
+		if s[0] != "1rtt" {
+			t := strings.TrimSuffix(s[0], "min")
+			if t == s[0] {
+				return nil, fmt.Errorf("invaild vless encryption value: %s", encryption)
+			}
+			i, err := strconv.Atoi(t)
+			if err != nil {
+				return nil, fmt.Errorf("invaild vless encryption value: %s", encryption)
+			}
+			minutes = uint32(i)
+		}
+		var xor uint32
+		switch s[1] {
+		case "vless":
+		case "aes128xor":
+			xor = 1
+		default:
+			return nil, fmt.Errorf("invaild vless encryption value: %s", encryption)
+		}
+		b, err := base64.RawURLEncoding.DecodeString(s[3])
+		if err != nil {
+			return nil, fmt.Errorf("invaild vless encryption value: %s", encryption)
+		}
+		if len(b) == MLKEM768ClientLength {
+			client := &ClientInstance{}
+			if err = client.Init(b, xor, time.Duration(minutes)*time.Minute); err != nil {
+				return nil, fmt.Errorf("failed to use mlkem768seed: %w", err)
+			}
+			return client, nil
+		} else {
+			return nil, fmt.Errorf("invaild vless encryption value: %s", encryption)
+		}
+	}
+	return nil, fmt.Errorf("invaild vless encryption value: %s", encryption)
+}
+
+// NewServer new server from decryption string
+// maybe return a nil *ServerInstance without any error, that means don't need to decrypt
+func NewServer(decryption string) (*ServerInstance, error) {
+	switch decryption {
+	case "", "none": // We will not reject empty string like xray-core does, because we need to ensure compatibility
+		return nil, nil
+	}
+	if s := strings.SplitN(decryption, "-", 4); len(s) == 4 && s[2] == "mlkem768seed" {
+		var minutes uint32
+		if s[0] != "1rtt" {
+			t := strings.TrimSuffix(s[0], "min")
+			if t == s[0] {
+				return nil, fmt.Errorf("invaild vless decryption value: %s", decryption)
+			}
+			i, err := strconv.Atoi(t)
+			if err != nil {
+				return nil, fmt.Errorf("invaild vless decryption value: %s", decryption)
+			}
+			minutes = uint32(i)
+		}
+		var xor uint32
+		switch s[1] {
+		case "vless":
+		case "aes128xor":
+			xor = 1
+		default:
+			return nil, fmt.Errorf("invaild vless decryption value: %s", decryption)
+		}
+		b, err := base64.RawURLEncoding.DecodeString(s[3])
+		if err != nil {
+			return nil, fmt.Errorf("invaild vless decryption value: %s", decryption)
+		}
+		if len(b) == MLKEM768SeedLength {
+			server := &ServerInstance{}
+			if err = server.Init(b, xor, time.Duration(minutes)*time.Minute); err != nil {
+				return nil, fmt.Errorf("failed to use mlkem768seed: %w", err)
+			}
+			return server, nil
+		} else {
+			return nil, fmt.Errorf("invaild vless decryption value: %s", decryption)
+		}
+	}
+	return nil, fmt.Errorf("invaild vless decryption value: %s", decryption)
+}