--- a/go/crypto.go	Tue Nov 13 21:11:20 2018 +0900
+++ b/go/crypto.go	Wed Nov 14 19:43:40 2018 +0900
@@ -1,7 +1,7 @@
 /*
  crypto.go  : crypto-program.
- Version    : 0.0
- Last Change: 2018-10-19 金 15:58:10.
+ Version    : 1.1
+ Last Change: 2018-11-14 水 13:27:48.
 
  install to: rsearcher_root/
              server_root/
@@ -26,7 +26,7 @@
 var version string
 
 func init() {
-	version = "1.0"
+	version = "1.1"	// output file version
 }
 
 func main() {
@@ -40,6 +40,8 @@
 	decr := flag.String( "d", "", "decrypt hhs." )
 	ghhs := flag.String( "f", "", "get hhs info." )
 
+	opf  := flag.String( "o", "", "output file." )
+
 	pver := flag.Bool( "v", false, "print version." )
 
 	flag.Parse()
@@ -138,7 +140,8 @@
 		stream := cipher.NewCTR( block, iv )
 		stream.XORKeyStream( ciphertext[ aes.BlockSize: ], plaintext )
 
-		fmt.Printf( "%s", ciphertext )
+		//fmt.Printf( "%s", ciphertext )
+		output( *opf, string( ciphertext ) )
 		os.Exit( 0 )
 	}
 
@@ -154,7 +157,8 @@
 		stream := cipher.NewCTR( block, iv )
 		stream.XORKeyStream( plaintext, ciphertext[ aes.BlockSize: ] )
 
-		fmt.Printf( "%s", plaintext )
+		//fmt.Printf( "%s", plaintext )
+		output( *opf, string( plaintext ) )
 		os.Exit( 0 )
 	}
 
@@ -175,3 +179,18 @@
 	return fmt.Sprintf( "%x", h.Sum( nil ) )
 }
 
+/* Output Function */
+func output( file, str string ) {
+	if file == "" {
+		fmt.Fprint( os.Stdout, str )
+	} else {
+		os.Remove( file )
+		f, err := os.OpenFile( file, os.O_RDWR|os.O_CREATE, 0644 )
+		if err != nil {
+			log.Fatal( err )
+		}
+		defer f.Close()
+		fmt.Fprint( f, str )
+	}
+}
+