Einhugur_2FA_TOTP.SecretKeySizes Enum  KEY_SIZE_80_BIT = 0 | 80 bits - It is not uncommon that companies use 80 bits is used but note that RFC 4226 requires 128 bits and recommends 160 bits. |
| KEY_SIZE_128_BIT = 1 | 128 bits. |
| KEY_SIZE_160_BIT = 2 | 160 bits. |