1 files changed, 47 insertions, 0 deletions
diff --git a/go/parabola_hackers/util.go b/go/parabola_hackers/util.go
new file mode 100644
index 0000000..9a241db
--- /dev/null
+++ b/go/parabola_hackers/util.go
@@ -0,0 +1,47 @@
+// Copyright 2015-2016 Luke Shumaker <lukeshu@sbcglobal.net>.
+//
+// This is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of
+// the License, or (at your option) any later version.
+//
+// This software 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public
+// License along with this manual; if not, see
+// <http://www.gnu.org/licenses/>.
+
+package parabola_hackers
+
+import (
+	"crypto/rand"
+	"math/big"
+)
+
+func RandomString(alphabet string, n uint) (str string, err error) {
+	var alphabet_len = big.NewInt(int64(len(alphabet)))
+	var bigint *big.Int
+	_str := make([]byte, n)
+	for i := 0; i < len(_str); i++ {
+		bigint, err = rand.Int(rand.Reader, alphabet_len)
+		if err != nil {
+			return
+		}
+		_str[i] = alphabet[bigint.Int64()]
+	}
+	str = string(_str[:])
+	return
+}
+
+func Set2list(set map[string]bool) []string {
+	list := make([]string, len(set))
+	i := uint(0)
+	for item, _ := range set {
+		list[i] = item
+		i++
+	}
+	return list
+}