Bit of cleanup in hkex.Read(),Write() and server.go read bufsize to 512

demo/server.go

@@ -44,7 +44,7 @@ func main() {
 			go func(ch chan []byte, eCh chan error) {
 				for {
 					// try to read the data
-					data := make([]byte, 8)
+					data := make([]byte, 512)
 					chN, err = c.Read(data)
 					if err != nil {
 						// send an error if it's encountered

hkexnet.go

@@ -126,13 +126,14 @@ func (hc Conn) Read(b []byte) (n int, err error) {
 	if err != nil && err.Error() != "EOF" {
 		panic(err)
 	}
-	if n > 0 {
-		fmt.Printf("  ctext:%+v\n", b[:n])
+	fmt.Printf("  ctext:%+v\n", b[:n]) // print only used portion
 	db := bytes.NewBuffer(b[:n])
+	// The StreamReader acts like a pipe, decrypting
+	// whatever is available and forwarding the result
+	// to the parameter of Read() as a normal io.Reader
 	rs := &cipher.StreamReader{S: hc.r, R: db}
 	n, err = rs.Read(b)
 	fmt.Printf("  ptext:%+v\n", b[:n])
-	}
 	return
 }
 
@@ -140,6 +141,8 @@ func (hc Conn) Write(b []byte) (n int, err error) {
 	fmt.Printf("[Encrypting...]\n")
 	fmt.Printf("  ptext:%+v\n", b)
 	var wb bytes.Buffer
+	// The StreamWriter acts like a pipe, forwarding whatever is
+	// written to it through the cipher, encrypting as it goes
 	ws := &cipher.StreamWriter{S: hc.w, W: &wb}
 	n, err = ws.Write(b)
 	fmt.Printf("  ctext:%+v\n", wb.Bytes())