Update version

main.go

@@ -1,12 +1,13 @@
 // GoPass
 // Author: Maximilian Patterson
-// Version: 1.2.0
+// Version: 1.2.2
 package main
 
 import (
 	cryptorand "crypto/rand"
 	"encoding/binary"
 	"fmt"
+	"math/big"
 	mathrand "math/rand"
 	"os"
 	"strconv"
@@ -18,13 +19,15 @@ func main() {
 	// Take in all OS arg
 	args := os.Args[1:]
 	if len(args) < 1 {
-		panic("No password length specified! (ex: ./gopass 16)")
+		println("No password length specified! (ex: ./gopass 16)")
+		return
 	}
 
 	// Convert String arg to int
 	size, err := strconv.Atoi(args[0])
 	if err != nil {
-		panic("First argument supplied must be an integer! (ex: 16)")
+		println("First argument supplied must be an integer! (ex: 16)")
+		return
 	}
 
 	// Grab second argument (if it exists) and use it as a disallowed character(s)
@@ -50,14 +53,20 @@ func main() {
 	var b [8]byte
 	_, err = cryptorand.Read(b[:])
 	if err != nil {
-		panic("Error securely seeding crypto/rand!")
+		println("Error securely seeding crypto/rand!")
+		return
 	}
 	mathrand.Seed(int64(binary.LittleEndian.Uint64(b[:])))
 
 	// Assign every slot of pass to a random allowedCharacter
 	for i := range pass {
 		// Generate a random int greater than 0 and not to exceed the length of allowedCharacters
-		pass[i] = allowedCharacters[mathrand.Intn(len(allowedCharacters))]
+		index, err := cryptorand.Int(cryptorand.Reader, big.NewInt(int64(len(allowedCharacters))))
+		if err != nil {
+			println("Error securely generating random character!")
+			return
+		}
+		pass[i] = allowedCharacters[index.Int64()]
 	}
 
 	// Print the password