HMAC key(s) are required by the ADSS HMAC Service to sign its responses sent back to the client applications. The ADSS Key Manager module is used to generate/import the required infrastructure keys.

In order to generate the keys within Key Manager module, see the section: Generating New Keys.  When generating a HMAC key, select the key purpose "HMAC Key". Keys held in a PKCS#11 device can also be used for HMAC key, see the section Crypto Source to configure and import the keys from it.  

See also

Step 2 - Configuring HMAC Profile
Step 3 - Using the Service Manager