diff --git a/common/net/transport.go b/common/net/transport.go
index cb581cd6..daa0dd1d 100644
--- a/common/net/transport.go
+++ b/common/net/transport.go
@@ -17,20 +17,6 @@ func ReadFrom(reader io.Reader, buffer *alloc.Buffer) (*alloc.Buffer, error) {
 	return buffer, err
 }
 
-// ReadAllBytes reads all bytes required from reader, if no error happens.
-func ReadAllBytes(reader io.Reader, buffer []byte) (int, error) {
-	bytesRead := 0
-	bytesAsked := len(buffer)
-	for bytesRead < bytesAsked {
-		nBytes, err := reader.Read(buffer[bytesRead:])
-		bytesRead += nBytes
-		if err != nil {
-			return bytesRead, err
-		}
-	}
-	return bytesRead, nil
-}
-
 // ReaderToChan dumps all content from a given reader to a chan by constantly reading it until EOF.
 func ReaderToChan(stream chan<- *alloc.Buffer, reader io.Reader) error {
 	allocate := alloc.NewBuffer
diff --git a/proxy/shadowsocks/protocol.go b/proxy/shadowsocks/protocol.go
index 8df98b4b..067cc4f8 100644
--- a/proxy/shadowsocks/protocol.go
+++ b/proxy/shadowsocks/protocol.go
@@ -24,7 +24,7 @@ func ReadRequest(reader io.Reader) (*Request, error) {
 	buffer := alloc.NewSmallBuffer()
 	defer buffer.Release()
 
-	_, err := v2net.ReadAllBytes(reader, buffer.Value[:1])
+	_, err := io.ReadFull(reader, buffer.Value[:1])
 	if err != nil {
 		log.Error("Shadowsocks: Failed to read address type: ", err)
 		return nil, transport.CorruptedPacket
@@ -35,27 +35,27 @@ func ReadRequest(reader io.Reader) (*Request, error) {
 	addrType := buffer.Value[0]
 	switch addrType {
 	case AddrTypeIPv4:
-		_, err := v2net.ReadAllBytes(reader, buffer.Value[:4])
+		_, err := io.ReadFull(reader, buffer.Value[:4])
 		if err != nil {
 			log.Error("Shadowsocks: Failed to read IPv4 address: ", err)
 			return nil, transport.CorruptedPacket
 		}
 		request.Address = v2net.IPAddress(buffer.Value[:4])
 	case AddrTypeIPv6:
-		_, err := v2net.ReadAllBytes(reader, buffer.Value[:16])
+		_, err := io.ReadFull(reader, buffer.Value[:16])
 		if err != nil {
 			log.Error("Shadowsocks: Failed to read IPv6 address: ", err)
 			return nil, transport.CorruptedPacket
 		}
 		request.Address = v2net.IPAddress(buffer.Value[:16])
 	case AddrTypeDomain:
-		_, err := v2net.ReadAllBytes(reader, buffer.Value[:1])
+		_, err := io.ReadFull(reader, buffer.Value[:1])
 		if err != nil {
 			log.Error("Shadowsocks: Failed to read domain lenth: ", err)
 			return nil, transport.CorruptedPacket
 		}
 		domainLength := int(buffer.Value[0])
-		_, err = v2net.ReadAllBytes(reader, buffer.Value[:domainLength])
+		_, err = io.ReadFull(reader, buffer.Value[:domainLength])
 		if err != nil {
 			log.Error("Shadowsocks: Failed to read domain: ", err)
 			return nil, transport.CorruptedPacket
@@ -66,7 +66,7 @@ func ReadRequest(reader io.Reader) (*Request, error) {
 		return nil, transport.CorruptedPacket
 	}
 
-	_, err = v2net.ReadAllBytes(reader, buffer.Value[:2])
+	_, err = io.ReadFull(reader, buffer.Value[:2])
 	if err != nil {
 		log.Error("Shadowsocks: Failed to read port: ", err)
 		return nil, transport.CorruptedPacket
diff --git a/proxy/shadowsocks/shadowsocks.go b/proxy/shadowsocks/shadowsocks.go
index 57b2c08b..4c033212 100644
--- a/proxy/shadowsocks/shadowsocks.go
+++ b/proxy/shadowsocks/shadowsocks.go
@@ -4,6 +4,7 @@ package shadowsocks
 
 import (
 	"crypto/rand"
+	"io"
 	"sync"
 
 	"github.com/v2ray/v2ray-core/app"
@@ -127,7 +128,7 @@ func (this *Shadowsocks) handleConnection(conn *hub.TCPConn) {
 	buffer := alloc.NewSmallBuffer()
 	defer buffer.Release()
 
-	_, err := v2net.ReadAllBytes(conn, buffer.Value[:this.config.Cipher.IVSize()])
+	_, err := io.ReadFull(conn, buffer.Value[:this.config.Cipher.IVSize()])
 	if err != nil {
 		log.Error("Shadowsocks: Failed to read IV: ", err)
 		return
diff --git a/proxy/vmess/outbound/outbound.go b/proxy/vmess/outbound/outbound.go
index 74b5fd9a..da96bfd8 100644
--- a/proxy/vmess/outbound/outbound.go
+++ b/proxy/vmess/outbound/outbound.go
@@ -3,6 +3,7 @@ package outbound
 import (
 	"crypto/md5"
 	"crypto/rand"
+	"io"
 	"net"
 	"sync"
 	"time"
@@ -39,8 +40,8 @@ func (this *VMessOutboundHandler) Dispatch(firstPacket v2net.Packet, ray ray.Out
 	}
 
 	buffer := alloc.NewSmallBuffer()
-	defer buffer.Release()                             // Buffer is released after communication finishes.
-	v2net.ReadAllBytes(rand.Reader, buffer.Value[:33]) // 16 + 16 + 1
+	defer buffer.Release()                      // Buffer is released after communication finishes.
+	io.ReadFull(rand.Reader, buffer.Value[:33]) // 16 + 16 + 1
 	request.RequestIV = buffer.Value[:16]
 	request.RequestKey = buffer.Value[16:32]
 	request.ResponseHeader = buffer.Value[32]
@@ -170,7 +171,7 @@ func (this *VMessOutboundHandler) handleResponse(conn net.Conn, request *protoco
 		dataLen := int(buffer.Value[3])
 		if buffer.Len() < dataLen+4 { // Rare case
 			diffBuffer := make([]byte, dataLen+4-buffer.Len())
-			v2net.ReadAllBytes(decryptResponseReader, diffBuffer)
+			io.ReadFull(decryptResponseReader, diffBuffer)
 			buffer.Append(diffBuffer)
 		}
 		command := buffer.Value[2]
diff --git a/proxy/vmess/protocol/vmess.go b/proxy/vmess/protocol/vmess.go
index fc613f66..6f608d87 100644
--- a/proxy/vmess/protocol/vmess.go
+++ b/proxy/vmess/protocol/vmess.go
@@ -69,7 +69,7 @@ func (this *VMessRequestReader) Read(reader io.Reader) (*VMessRequest, error) {
 	buffer := alloc.NewSmallBuffer()
 	defer buffer.Release()
 
-	nBytes, err := v2net.ReadAllBytes(reader, buffer.Value[:vmess.IDBytesLen])
+	nBytes, err := io.ReadFull(reader, buffer.Value[:vmess.IDBytesLen])
 	if err != nil {
 		log.Debug("VMess: Failed to read request ID (", nBytes, " bytes): ", err)
 		return nil, err
@@ -91,7 +91,7 @@ func (this *VMessRequestReader) Read(reader io.Reader) (*VMessRequest, error) {
 
 	decryptor := v2crypto.NewCryptionReader(aesStream, reader)
 
-	nBytes, err = v2net.ReadAllBytes(decryptor, buffer.Value[:41])
+	nBytes, err = io.ReadFull(decryptor, buffer.Value[:41])
 	if err != nil {
 		log.Debug("VMess: Failed to read request header (", nBytes, " bytes): ", err)
 		return nil, err
@@ -117,7 +117,7 @@ func (this *VMessRequestReader) Read(reader io.Reader) (*VMessRequest, error) {
 
 	switch buffer.Value[40] {
 	case addrTypeIPv4:
-		nBytes, err = v2net.ReadAllBytes(decryptor, buffer.Value[41:45]) // 4 bytes
+		nBytes, err = io.ReadFull(decryptor, buffer.Value[41:45]) // 4 bytes
 		bufferLen += 4
 		if err != nil {
 			log.Debug("VMess: Failed to read target IPv4 (", nBytes, " bytes): ", err)
@@ -125,7 +125,7 @@ func (this *VMessRequestReader) Read(reader io.Reader) (*VMessRequest, error) {
 		}
 		request.Address = v2net.IPAddress(buffer.Value[41:45])
 	case addrTypeIPv6:
-		nBytes, err = v2net.ReadAllBytes(decryptor, buffer.Value[41:57]) // 16 bytes
+		nBytes, err = io.ReadFull(decryptor, buffer.Value[41:57]) // 16 bytes
 		bufferLen += 16
 		if err != nil {
 			log.Debug("VMess: Failed to read target IPv6 (", nBytes, " bytes): ", nBytes, err)
@@ -133,7 +133,7 @@ func (this *VMessRequestReader) Read(reader io.Reader) (*VMessRequest, error) {
 		}
 		request.Address = v2net.IPAddress(buffer.Value[41:57])
 	case addrTypeDomain:
-		nBytes, err = v2net.ReadAllBytes(decryptor, buffer.Value[41:42])
+		nBytes, err = io.ReadFull(decryptor, buffer.Value[41:42])
 		if err != nil {
 			log.Debug("VMess: Failed to read target domain (", nBytes, " bytes): ", nBytes, err)
 			return nil, err
@@ -142,7 +142,7 @@ func (this *VMessRequestReader) Read(reader io.Reader) (*VMessRequest, error) {
 		if domainLength == 0 {
 			return nil, transport.CorruptedPacket
 		}
-		nBytes, err = v2net.ReadAllBytes(decryptor, buffer.Value[42:42+domainLength])
+		nBytes, err = io.ReadFull(decryptor, buffer.Value[42:42+domainLength])
 		if err != nil {
 			log.Debug("VMess: Failed to read target domain (", nBytes, " bytes): ", nBytes, err)
 			return nil, err
@@ -152,7 +152,7 @@ func (this *VMessRequestReader) Read(reader io.Reader) (*VMessRequest, error) {
 		request.Address = v2net.DomainAddress(string(domainBytes))
 	}
 
-	nBytes, err = v2net.ReadAllBytes(decryptor, buffer.Value[bufferLen:bufferLen+4])
+	nBytes, err = io.ReadFull(decryptor, buffer.Value[bufferLen:bufferLen+4])
 	if err != nil {
 		log.Debug("VMess: Failed to read checksum (", nBytes, " bytes): ", nBytes, err)
 		return nil, err