Xray-core/common/crypto/io.go

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package crypto
import (
"crypto/cipher"
"io"
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"github.com/xtls/xray-core/common/buf"
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)
type CryptionReader struct {
stream cipher.Stream
reader io.Reader
}
func NewCryptionReader(stream cipher.Stream, reader io.Reader) *CryptionReader {
return &CryptionReader{
stream: stream,
reader: reader,
}
}
func (r *CryptionReader) Read(data []byte) (int, error) {
nBytes, err := r.reader.Read(data)
if nBytes > 0 {
r.stream.XORKeyStream(data[:nBytes], data[:nBytes])
}
return nBytes, err
}
var (
_ buf.Writer = (*CryptionWriter)(nil)
)
type CryptionWriter struct {
stream cipher.Stream
writer io.Writer
bufWriter buf.Writer
}
// NewCryptionWriter creates a new CryptionWriter.
func NewCryptionWriter(stream cipher.Stream, writer io.Writer) *CryptionWriter {
return &CryptionWriter{
stream: stream,
writer: writer,
bufWriter: buf.NewWriter(writer),
}
}
// Write implements io.Writer.Write().
func (w *CryptionWriter) Write(data []byte) (int, error) {
w.stream.XORKeyStream(data, data)
if err := buf.WriteAllBytes(w.writer, data); err != nil {
return 0, err
}
return len(data), nil
}
// WriteMultiBuffer implements buf.Writer.
func (w *CryptionWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
for _, b := range mb {
w.stream.XORKeyStream(b.Bytes(), b.Bytes())
}
return w.bufWriter.WriteMultiBuffer(mb)
}