X-Git-Url: http://www.git.cypherpunks.ru/?p=balloon.git;a=blobdiff_plain;f=cmd%2Fballoon%2Fmain.go;h=b7fd973b5874af07430ffca10b3420f1f8bc9e24;hp=0c737c9dd794dfe9e6b5e095328e519e71fa4f5a;hb=8db12c1d04f1d1bc2311c42a08812f511bfae721;hpb=3524ab4193dc8d7ad50c76edb0aac02c062918ee

diff --git a/cmd/balloon/main.go b/cmd/balloon/main.go
index 0c737c9..b7fd973 100644
--- a/cmd/balloon/main.go
+++ b/cmd/balloon/main.go
@@ -1,3 +1,21 @@
+/*
+balloon -- Balloon password hashing function
+Copyright (C) 2016-2019 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as
+the Free Software Foundation, version 3 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this program.  If not, see
+<http://www.gnu.org/licenses/>.
+*/
+
 package main
 
 import (
@@ -7,6 +25,7 @@ import (
 	"flag"
 	"fmt"
 	"io"
+	"os"
 
 	"go.cypherpunks.ru/balloon"
 )
@@ -17,6 +36,10 @@ func main() {
 	p := flag.Int("p", 4, "Number of threads")
 	saltHex := flag.String("salt", "", "Salt, hexadecimal, optional")
 	passwd := flag.String("passwd", "", "Password")
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "balloon -- Strengthen password with Balloon+SHA512\n\n")
+		flag.PrintDefaults()
+	}
 	flag.Parse()
 	var salt []byte
 	var err error