The value of the Authentication Algorithm for a TEK IPsec
ESP SA. If no authentication is used, this value will be
zero (0).
Following are the Authentication Algorithm values defined in
RFC 2407, however the CgmGdoiEncryptionAlgorithm TC defines all
possible values.
Algorithm Type Value
-------------- -----
HMAC-MD5 1
HMAC-SHA 2
DES-MAC 3
KPDK 4