Remove borsh borsh new borsch

mtproto/rpc/handshake_response.go

@@ -0,0 +1,49 @@
+package rpc
+
+import (
+	"bytes"
+
+	"github.com/juju/errors"
+)
+
+type HandshakeResponse struct {
+	Type      []byte
+	Flags     []byte
+	SenderPID []byte
+	PeerPID   []byte
+}
+
+func (r *HandshakeResponse) Bytes() []byte {
+	buf := &bytes.Buffer{}
+
+	buf.Write(r.Type[:])
+	buf.Write(r.Flags[:])
+	buf.Write(r.SenderPID[:])
+	buf.Write(r.PeerPID[:])
+
+	return buf.Bytes()
+}
+
+func (r *HandshakeResponse) Valid(req *HandshakeRequest) error {
+	if !bytes.Equal(r.Type, TagHandshake) {
+		return errors.New("Unexpected handshake tag")
+	}
+	if !bytes.Equal(r.PeerPID, HandshakeSenderPID) {
+		return errors.New("Incorrect sender PID")
+	}
+
+	return nil
+}
+
+func NewHandshakeResponse(data []byte) (*HandshakeResponse, error) {
+	if len(data) != 32 {
+		return nil, errors.New("Incorrect handshake response length")
+	}
+
+	return &HandshakeResponse{
+		Type:      data[:4],
+		Flags:     data[4:8],
+		SenderPID: data[8:20],
+		PeerPID:   data[20:],
+	}, nil
+}