2.2.2.6 HMAC Structure

The HMAC structure is used to contain a SHA-256 HMAC.

0	1	2	3	4	5	6	7	8	9	1 0	1	2	3	4	5	6	7	8	9	2 0	1	2	3	4	5	6	7	8	9	3 0	1
header																								Value (32 bytes)
...
...
...
...

header (3 bytes): The header field contains the CommonHeader structure (section 2.2.2.2), where the value of the Id field is set to 9 (HMAC), as specified in TypeId enumeration (section 2.2.1.3), and the value of the Length field set to 32 bytes.

Value (32 bytes): The Value field contains the 32 bytes making up the SHA-256 HMAC.