| uid |
|---|
OtpCommandChallengeResponse |
Perform a challenge-response style operation using either YubicoOTP or HMAC-SHA1 against a configured YubiKey slot.
YubiKey firmware 2.2 and later.
| CLA | INS | P1 | P2 | Lc | Data |
|---|---|---|---|---|---|
| 0x00 | 0x01 | (See below) | 0x00 | (varies) | Challenge data |
P1 indicates both the type of challenge-response algorithm and the slot in which to use.
| Option | Value |
|---|---|
| YubicoOTP (Short) | 0x20 |
| YubicoOTP (Long) | 0x28 |
| HMAC-SHA1 (Short) | 0x30 |
| HMAC-SHA1 (Long) | 0x38 |
A string of bytes no greater than 64-bytes in length.
| Lr | Data | SW1 | SW1 |
|---|---|---|---|
| 0x10 or 0x14 | Response data | 0x90 | 0x00 |
If the YubicoOTP algorithm was used, a 16-byte response will be given. HMAC-SHA1 will return a 20-byte response.
TODO