initial commit

internal/application/auth/utils.go

@@ -0,0 +1,16 @@
+package auth
+
+import (
+	"crypto/rand"
+	"fmt"
+	"math/big"
+)
+
+func generateOTP() (string, error) {
+	newInt := big.NewInt(10000) // 0 .. 999999
+	n, err := rand.Int(rand.Reader, newInt)
+	if err != nil {
+		return "", err
+	}
+	return fmt.Sprintf("%04d", n.Int64()), err
+}