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stream.go
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stream.go
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package shadowaead
import (
"crypto/rand"
"io"
"net"
"github.com/Asutorufa/yuhaiin/pkg/net/proxy/shadowsocks/internal"
ycrypto "github.com/Asutorufa/yuhaiin/pkg/net/proxy/yuubinsya/crypto"
)
// payloadSizeMax is the maximum size of payload in bytes.
const payloadSizeMax = 0x3FFF // 16*1024 - 1
type streamConn struct {
net.Conn
Cipher
r io.Reader
w io.Writer
}
func (c *streamConn) initReader() error {
salt := make([]byte, c.SaltSize())
if _, err := io.ReadFull(c.Conn, salt); err != nil {
return err
}
aead, err := c.Decrypter(salt)
if err != nil {
return err
}
if internal.CheckSalt(salt) {
return ErrRepeatedSalt
}
c.r = ycrypto.NewReader(c.Conn, make([]byte, aead.NonceSize()), aead, payloadSizeMax)
return nil
}
func (c *streamConn) Read(b []byte) (int, error) {
if c.r == nil {
if err := c.initReader(); err != nil {
return 0, err
}
}
return c.r.Read(b)
}
func (c *streamConn) initWriter() error {
salt := make([]byte, c.SaltSize())
if _, err := io.ReadFull(rand.Reader, salt); err != nil {
return err
}
aead, err := c.Encrypter(salt)
if err != nil {
return err
}
_, err = c.Conn.Write(salt)
if err != nil {
return err
}
internal.AddSalt(salt)
c.w = ycrypto.NewWriter(c.Conn, make([]byte, aead.NonceSize()), aead, payloadSizeMax)
return nil
}
func (c *streamConn) Write(b []byte) (int, error) {
if c.w == nil {
if err := c.initWriter(); err != nil {
return 0, err
}
}
return c.w.Write(b)
}
// NewConn wraps a stream-oriented net.Conn with cipher.
func NewConn(c net.Conn, ciph Cipher) net.Conn { return &streamConn{Conn: c, Cipher: ciph} }