HMAC key token
The two formats of the HMAC key token.
HMAC key tokens have two formats, HMAC MAC variable-length symmetric key token and HMAC symmetric null key token.
HMAC symmetric null key token
Table 1 shows the format of
the HMAC symmetric null key token.
| Offset (bytes) | Length (bytes) | Description |
|---|---|---|
| Header | ||
| 0 | 1 | X'00' Token identifier, which indicates that this is a null key token. |
| 1 | 1 | X'00' Version |
| 2 - 3 | 2 | X'0008' Length of the key token structure. |
| 4 - 7 | 4 | Ignored (zero). |