mirror of https://github.com/Dreamacro/clash.git
116 lines
2.3 KiB
Go
116 lines
2.3 KiB
Go
package vmess
|
|
|
|
import (
|
|
"crypto/cipher"
|
|
"encoding/binary"
|
|
"errors"
|
|
"io"
|
|
)
|
|
|
|
type aeadWriter struct {
|
|
io.Writer
|
|
cipher.AEAD
|
|
nonce [32]byte
|
|
count uint16
|
|
iv []byte
|
|
}
|
|
|
|
func newAEADWriter(w io.Writer, aead cipher.AEAD, iv []byte) *aeadWriter {
|
|
return &aeadWriter{Writer: w, AEAD: aead, iv: iv}
|
|
}
|
|
|
|
func (w *aeadWriter) Write(b []byte) (n int, err error) {
|
|
buf := bufPool.Get().([]byte)
|
|
defer bufPool.Put(buf[:cap(buf)])
|
|
length := len(b)
|
|
for {
|
|
if length == 0 {
|
|
break
|
|
}
|
|
readLen := chunkSize - w.Overhead()
|
|
if length < readLen {
|
|
readLen = length
|
|
}
|
|
payloadBuf := buf[lenSize : lenSize+chunkSize-w.Overhead()]
|
|
copy(payloadBuf, b[n:n+readLen])
|
|
|
|
binary.BigEndian.PutUint16(buf[:lenSize], uint16(readLen+w.Overhead()))
|
|
binary.BigEndian.PutUint16(w.nonce[:2], w.count)
|
|
copy(w.nonce[2:], w.iv[2:12])
|
|
|
|
w.Seal(payloadBuf[:0], w.nonce[:w.NonceSize()], payloadBuf[:readLen], nil)
|
|
w.count++
|
|
|
|
_, err = w.Writer.Write(buf[:lenSize+readLen+w.Overhead()])
|
|
if err != nil {
|
|
break
|
|
}
|
|
n += readLen
|
|
length -= readLen
|
|
}
|
|
return
|
|
}
|
|
|
|
type aeadReader struct {
|
|
io.Reader
|
|
cipher.AEAD
|
|
nonce [32]byte
|
|
buf []byte
|
|
offset int
|
|
iv []byte
|
|
sizeBuf []byte
|
|
count uint16
|
|
}
|
|
|
|
func newAEADReader(r io.Reader, aead cipher.AEAD, iv []byte) *aeadReader {
|
|
return &aeadReader{Reader: r, AEAD: aead, iv: iv, sizeBuf: make([]byte, lenSize)}
|
|
}
|
|
|
|
func (r *aeadReader) Read(b []byte) (int, error) {
|
|
if r.buf != nil {
|
|
n := copy(b, r.buf[r.offset:])
|
|
r.offset += n
|
|
if r.offset == len(r.buf) {
|
|
bufPool.Put(r.buf[:cap(r.buf)])
|
|
r.buf = nil
|
|
}
|
|
return n, nil
|
|
}
|
|
|
|
_, err := io.ReadFull(r.Reader, r.sizeBuf)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
size := int(binary.BigEndian.Uint16(r.sizeBuf))
|
|
if size > maxSize {
|
|
return 0, errors.New("Buffer is larger than standard")
|
|
}
|
|
|
|
buf := bufPool.Get().([]byte)
|
|
_, err = io.ReadFull(r.Reader, buf[:size])
|
|
if err != nil {
|
|
bufPool.Put(buf[:cap(buf)])
|
|
return 0, err
|
|
}
|
|
|
|
binary.BigEndian.PutUint16(r.nonce[:2], r.count)
|
|
copy(r.nonce[2:], r.iv[2:12])
|
|
|
|
_, err = r.Open(buf[:0], r.nonce[:r.NonceSize()], buf[:size], nil)
|
|
r.count++
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
realLen := size - r.Overhead()
|
|
n := copy(b, buf[:realLen])
|
|
if len(b) >= realLen {
|
|
bufPool.Put(buf[:cap(buf)])
|
|
return n, nil
|
|
}
|
|
|
|
r.offset = n
|
|
r.buf = buf[:realLen]
|
|
return n, nil
|
|
}
|