Add password generator algorithm

Add algorithm for password generation

Author: CodeB9

other/PasswordGenerator.go

@@ -0,0 +1,54 @@
+// This program generates a password from a list of possible chars
+// You must provide a minimum length and a maximum length
+// This length is not fixed if you generate multiple passwords for the same range
+
+package main
+
+import (
+	crand "crypto/rand"
+	"fmt"
+	"io"
+	"math/rand"
+	"time"
+)
+
+func generatePassword(minLength int, maxLength int) string {
+	var chars = []byte("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*()-_=+,.?/:;{}[]`~")
+
+	var length = rand.Intn(maxLength-minLength) + minLength
+
+	newPassword := make([]byte, length)
+	randomData := make([]byte, length+(length/4))
+	clen := byte(len(chars))
+	maxrb := byte(256 - (256 % len(chars)))
+	i := 0
+	for {
+		if _, err := io.ReadFull(crand.Reader, randomData); err != nil {
+			panic(err)
+		}
+		for _, c := range randomData {
+			if c >= maxrb {
+				continue
+			}
+			newPassword[i] = chars[c%clen]
+			i++
+			if i == length {
+				return string(newPassword)
+			}
+		}
+	}
+}
+
+func main() {
+	rand.Seed(time.Now().Unix())
+
+	fmt.Print("Please specify a minimum length: ")
+	var minLength int
+	fmt.Scanf("%d", &minLength)
+
+	fmt.Print("Please specify a maximum length: ")
+	var maxLength int
+	fmt.Scanf("%d", &maxLength)
+
+	fmt.Printf("Your generated password is %v\n", generatePassword(minLength, maxLength))
+}