- Add sha prefix for peer id in protocol

- Add magic cookie in hello msg
- Add tests

relay/messages/id_test.go

@@ -0,0 +1,26 @@
+package messages
+
+import (
+	"encoding/binary"
+	"testing"
+
+	log "github.com/sirupsen/logrus"
+)
+
+func TestHashID(t *testing.T) {
+	hashedID, hashedStringId := HashID("abc")
+	enc := HashIDToString(hashedID)
+	if enc != hashedStringId {
+		t.Errorf("expected %s, got %s", hashedStringId, enc)
+	}
+
+	var magicHeader uint32 = 0x2112A442 // size 4 byte
+
+	msg := make([]byte, 4)
+	binary.BigEndian.PutUint32(msg, magicHeader)
+
+	magicHeader2 := []byte{0x21, 0x12, 0xA4, 0x42}
+
+	log.Infof("msg: %v, %v", msg, magicHeader2)
+
+}