'', 'ALGORITHM_SHA1' => 'sha1', 'ALGORITHM_SHA256' => 'sha256', 'ALGORITHM_SHA512' => 'sha512', 'ALGORITHM_MD5' => 'md5' ]; const DIGIT_COUNT = [ 'DIGIT_COUNT_UNSPECIFIED' => '', 'DIGIT_COUNT_SIX' => 6, 'DIGIT_COUNT_EIGHT' => 8 ]; const OTP_TYPE = [ 'OTP_TYPE_UNSPECIFIED' => '', 'OTP_TYPE_HOTP' => 'hotp', 'OTP_TYPE_TOTP' => 'totp' ]; private function __construct() {} }