Method leftPad

utils/totp.ts:90–92

* Left pad a string with zeros * @param str String to pad * @param len Desired length * @returns Padded string

(str: string, len: number)

   * @returns Padded string
   */
  private static leftPad(str: string, len: number): string {
    return str.padStart(len, "0")
  }

  /**
   * Verify if the input code is valid for the given secret