Add command to hash password directly

Useful for resetting passwords manually.

cmd/passwordgen/main.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/Gleipnir-Technology/nidus-sync/auth"
+)
+
+func main() {
+	var password string
+	scanValue("Please enter your password : ", &password)
+
+	hash, err := auth.HashPassword(password)
+	if err != nil {
+		fmt.Printf("Failed to hash password: %v\n", err)
+		os.Exit(1)
+	}
+
+	fmt.Println("Password:", password)
+	fmt.Println("Hash:    ", hash)
+
+}
+
+func scanValue(message string, result *string) {
+	fmt.Printf(message)
+	scanner := bufio.NewScanner(os.Stdin)
+	if ok := scanner.Scan(); !ok {
+		log.Fatal(errors.New("Failed to scan input"))
+	}
+	*result = scanner.Text()
+}