args... still needs charset minimums (how?)

pwgenerator/funcs.go

@@ -1,6 +1,9 @@
 package pwgenerator
 
 import (
+	"bytes"
+	"crypto/rand"
+	"math/big"
 	"sort"
 )
 
@@ -31,3 +34,26 @@ func sortDedupe(charset *CharSet) {
 
 	return
 }
+
+/*
+	saferRandInt uses crypto/rand instead of math/rand to get a random number.
+
+	While this is cryptographically safer, I guarantee it's a much bigger pain to do.
+*/
+func saferRandInt(max int) (randInt int, err error) {
+
+	var max64 int64 = int64(max)
+	var cryptoInt *big.Int = big.NewInt(max64)
+	var cryptoReader *bytes.Buffer = new(bytes.Buffer)
+	var randInt64 int64
+
+	if cryptoInt, err = rand.Int(cryptoReader, cryptoInt); err != nil {
+		return
+	}
+
+	randInt64 = cryptoInt.Int64()
+
+	randInt = int(randInt64)
+
+	return
+}