| Class | Rating | Complexity | Lines of code |
|---|---|---|---|
| Two_Factor_Core | 168 | 822 | |
| Two_Factor_Totp | 53 | 424 | |
| Two_Factor_FIDO_U2F | 51 | 193 | |
| u2flib_server\U2F | 49 | 194 | |
| Two_Factor_Email | 34 | 138 | |
| Two_Factor_Backup_Codes | 32 | 224 | |
| Two_Factor_FIDO_U2F_Admin | 26 | 195 | |
| Two_Factor_Provider | 14 | 30 | |
| Two_Factor_FIDO_U2F_Admin_List_Table | 11 | 84 | |
| Two_Factor_Dummy | 8 | 29 | |
| Two_Factor_Compat | 6 | 13 | |
| u2flib_server\RegisterRequest | 1 | 4 | |
| u2flib_server\Error | 1 | 3 | |
| u2flib_server\Registration | 0 | 0 | |
| u2flib_server\SignRequest | 0 | 0 |