refactor protocol

common/crypto/aes.go

@@ -6,22 +6,14 @@ import (
 	"io"
 )
 
-func NewAesDecryptionStream(key []byte, iv []byte) (cipher.Stream, error) {
-	aesBlock, err := aes.NewCipher(key)
-	if err != nil {
-		return nil, err
-	}
-
-	return cipher.NewCFBDecrypter(aesBlock, iv), nil
+func NewAesDecryptionStream(key []byte, iv []byte) cipher.Stream {
+	aesBlock, _ := aes.NewCipher(key)
+	return cipher.NewCFBDecrypter(aesBlock, iv)
 }
 
-func NewAesEncryptionStream(key []byte, iv []byte) (cipher.Stream, error) {
-	aesBlock, err := aes.NewCipher(key)
-	if err != nil {
-		return nil, err
-	}
-
-	return cipher.NewCFBEncrypter(aesBlock, iv), nil
+func NewAesEncryptionStream(key []byte, iv []byte) cipher.Stream {
+	aesBlock, _ := aes.NewCipher(key)
+	return cipher.NewCFBEncrypter(aesBlock, iv)
 }
 
 type cryptionReader struct {

common/crypto/benchmark_test.go

@@ -35,7 +35,7 @@ func BenchmarkChaCha20IETF(b *testing.B) {
 func BenchmarkAESEncryption(b *testing.B) {
 	key := make([]byte, 32)
 	iv := make([]byte, 16)
-	c, _ := NewAesEncryptionStream(key, iv)
+	c := NewAesEncryptionStream(key, iv)
 
 	benchmarkStream(b, c)
 }
@@ -43,7 +43,7 @@ func BenchmarkAESEncryption(b *testing.B) {
 func BenchmarkAESDecryption(b *testing.B) {
 	key := make([]byte, 32)
 	iv := make([]byte, 16)
-	c, _ := NewAesDecryptionStream(key, iv)
+	c := NewAesDecryptionStream(key, iv)
 
 	benchmarkStream(b, c)
 }

common/protocol/encoding.go

@@ -2,26 +2,24 @@ package protocol
 
 import (
 	"io"
-
-	"github.com/v2ray/v2ray-core/common/alloc"
 )
 
 type RequestEncoder interface {
-	EncodeHeader(*RequestHeader) *alloc.Buffer
-	EncodeBody(io.Writer) io.Writer
+	EncodeRequestHeader(*RequestHeader, io.Writer)
+	EncodeRequestBody(io.Writer) io.Writer
 }
 
 type RequestDecoder interface {
-	DecodeHeader(io.Reader) *RequestHeader
-	DecodeBody(io.Reader) io.Reader
+	DecodeRequestHeader(io.Reader) *RequestHeader
+	DecodeRequestBody(io.Reader) io.Reader
 }
 
 type ResponseEncoder interface {
-	EncodeHeader(*ResponseHeader) *alloc.Buffer
-	EncodeBody(io.Writer) io.Writer
+	EncodeResponseHeader(*ResponseHeader, io.Writer)
+	EncodeResponseBody(io.Writer) io.Writer
 }
 
 type ResponseDecoder interface {
-	DecodeHeader(io.Reader) *ResponseHeader
-	DecodeBody(io.Reader) io.Reader
+	DecodeResponseHeader(io.Reader) *ResponseHeader
+	DecodeResponseBody(io.Reader) io.Reader
 }

common/protocol/id.go

@@ -1,8 +1,10 @@
 package protocol
 
 import (
+	"crypto/hmac"
 	"crypto/md5"
 	"errors"
+	"hash"
 
 	"github.com/v2ray/v2ray-core/common/uuid"
 )
@@ -15,6 +17,12 @@ var (
 	InvalidID = errors.New("Invalid ID.")
 )
 
+type IDHash func(key []byte) hash.Hash
+
+func DefaultIDHash(key []byte) hash.Hash {
+	return hmac.New(md5.New, key)
+}
+
 // The ID of en entity, in the form of an UUID.
 type ID struct {
 	uuid   *uuid.UUID

common/protocol/time.go

@@ -2,6 +2,7 @@ package protocol
 
 import (
 	"math/rand"
+	"time"
 
 	"github.com/v2ray/v2ray-core/common/serial"
 )
@@ -14,6 +15,10 @@ func (this Timestamp) Bytes() []byte {
 
 type TimestampGenerator func() Timestamp
 
+func NowTime() Timestamp {
+	return Timestamp(time.Now().Unix())
+}
+
 func NewTimestampGenerator(base Timestamp, delta int) TimestampGenerator {
 	return func() Timestamp {
 		rangeInDelta := rand.Intn(delta*2) - delta

common/protocol/user_validator.go

@@ -1,7 +1,6 @@
 package protocol
 
 import (
-	"hash"
 	"sync"
 	"time"
 )
@@ -11,8 +10,6 @@ const (
 	cacheDurationSec  = 120
 )
 
-type IDHash func(key []byte) hash.Hash
-
 type idEntry struct {
 	id             *ID
 	userIdx        int

proxy/shadowsocks/config.go

@@ -28,18 +28,12 @@ func (this *AesCfb) IVSize() int {
 }
 
 func (this *AesCfb) NewEncodingStream(key []byte, iv []byte) (cipher.Stream, error) {
-	stream, err := crypto.NewAesEncryptionStream(key, iv)
-	if err != nil {
-		return nil, err
-	}
+	stream := crypto.NewAesEncryptionStream(key, iv)
 	return stream, nil
 }
 
 func (this *AesCfb) NewDecodingStream(key []byte, iv []byte) (cipher.Stream, error) {
-	stream, err := crypto.NewAesDecryptionStream(key, iv)
-	if err != nil {
-		return nil, err
-	}
+	stream := crypto.NewAesDecryptionStream(key, iv)
 	return stream, nil
 }
 

proxy/vmess/inbound/inbound.go

@@ -147,13 +147,7 @@ func (this *VMessInboundHandler) HandleConnection(connection *hub.TCPConn) {
 	responseKey := md5.Sum(request.RequestKey)
 	responseIV := md5.Sum(request.RequestIV)
 
-	aesStream, err := v2crypto.NewAesEncryptionStream(responseKey[:], responseIV[:])
-	if err != nil {
-		log.Error("VMessIn: Failed to create AES decryption stream: ", err)
-		close(input)
-		return
-	}
-
+	aesStream := v2crypto.NewAesEncryptionStream(responseKey[:], responseIV[:])
 	responseWriter := v2crypto.NewCryptionWriter(aesStream, connection)
 
 	// Optimize for small response packet
@@ -188,11 +182,7 @@ func handleInput(request *protocol.VMessRequest, reader io.Reader, input chan<-
 	defer close(input)
 	defer finish.Unlock()
 
-	aesStream, err := v2crypto.NewAesDecryptionStream(request.RequestKey, request.RequestIV)
-	if err != nil {
-		log.Error("VMessIn: Failed to create AES decryption stream: ", err)
-		return
-	}
+	aesStream := v2crypto.NewAesDecryptionStream(request.RequestKey, request.RequestIV)
 	descriptionReader := v2crypto.NewCryptionReader(aesStream, reader)
 	var requestReader v2io.Reader
 	if request.IsChunkStream() {

proxy/vmess/outbound/outbound.go

@@ -98,16 +98,12 @@ func (this *VMessOutboundHandler) startCommunicate(request *protocol.VMessReques
 
 func (this *VMessOutboundHandler) handleRequest(conn net.Conn, request *protocol.VMessRequest, firstPacket v2net.Packet, input <-chan *alloc.Buffer, finish *sync.Mutex) {
 	defer finish.Unlock()
-	aesStream, err := v2crypto.NewAesEncryptionStream(request.RequestKey[:], request.RequestIV[:])
-	if err != nil {
-		log.Error("VMessOut: Failed to create AES encryption stream: ", err)
-		return
-	}
+	aesStream := v2crypto.NewAesEncryptionStream(request.RequestKey[:], request.RequestIV[:])
 	encryptRequestWriter := v2crypto.NewCryptionWriter(aesStream, conn)
 
 	buffer := alloc.NewBuffer().Clear()
 	defer buffer.Release()
-	buffer, err = request.ToBytes(proto.NewTimestampGenerator(proto.Timestamp(time.Now().Unix()), 30), buffer)
+	buffer, err := request.ToBytes(proto.NewTimestampGenerator(proto.Timestamp(time.Now().Unix()), 30), buffer)
 	if err != nil {
 		log.Error("VMessOut: Failed to serialize VMess request: ", err)
 		return
@@ -160,16 +156,12 @@ func (this *VMessOutboundHandler) handleResponse(conn net.Conn, request *protoco
 	responseKey := md5.Sum(request.RequestKey[:])
 	responseIV := md5.Sum(request.RequestIV[:])
 
-	aesStream, err := v2crypto.NewAesDecryptionStream(responseKey[:], responseIV[:])
-	if err != nil {
-		log.Error("VMessOut: Failed to create AES encryption stream: ", err)
-		return
-	}
+	aesStream := v2crypto.NewAesDecryptionStream(responseKey[:], responseIV[:])
 	decryptResponseReader := v2crypto.NewCryptionReader(aesStream, conn)
 
 	buffer := alloc.NewSmallBuffer()
 	defer buffer.Release()
-	_, err = io.ReadFull(decryptResponseReader, buffer.Value[:4])
+	_, err := io.ReadFull(decryptResponseReader, buffer.Value[:4])
 
 	if err != nil {
 		log.Error("VMessOut: Failed to read VMess response (", buffer.Len(), " bytes): ", err)

proxy/vmess/protocol/vmess.go

@@ -100,12 +100,7 @@ func (this *VMessRequestReader) Read(reader io.Reader) (*VMessRequest, error) {
 	timestampHash := TimestampHash()
 	timestampHash.Write(hashTimestamp(timeSec))
 	iv := timestampHash.Sum(nil)
-	aesStream, err := v2crypto.NewAesDecryptionStream(userObj.ID.CmdKey(), iv)
-	if err != nil {
-		log.Debug("VMess: Failed to create AES stream: ", err)
-		return nil, err
-	}
-
+	aesStream := v2crypto.NewAesDecryptionStream(userObj.ID.CmdKey(), iv)
 	decryptor := v2crypto.NewCryptionReader(aesStream, reader)
 
 	nBytes, err = io.ReadFull(decryptor, buffer.Value[:41])
@@ -235,10 +230,7 @@ func (this *VMessRequest) ToBytes(timestampGenerator proto.TimestampGenerator, b
 	timestampHash := md5.New()
 	timestampHash.Write(hashTimestamp(timestamp))
 	iv := timestampHash.Sum(nil)
-	aesStream, err := v2crypto.NewAesEncryptionStream(this.User.ID.CmdKey(), iv)
-	if err != nil {
-		return nil, err
-	}
+	aesStream := v2crypto.NewAesEncryptionStream(this.User.ID.CmdKey(), iv)
 	aesStream.XORKeyStream(buffer.Value[encryptionBegin:encryptionEnd], buffer.Value[encryptionBegin:encryptionEnd])
 
 	return buffer, nil