The value of the SIG_HASH_ALGORITHM which specifies the SIG
payload hash algorithm. This is not required (i.e. could
have a value of zero) if the SIG_ALGORITHM is SIG_ALG_DSS or
SIG_ALG_ECDSS, which imply SIG_HASH_SHA1 (i.e. must have a
value of zero or SIG_HASH_SHA1).
Following are the Signature Hash Algorithm values defined in
the GDOI RFC 3547, however the CgmGdoiPseudoRandomFunction TC
defines all possible values.
Algorithm Type Value
-------------- -----
RESERVED 0
SIG_HASH_MD5 1
SIG_HASH_SHA1 2
RESERVED 3-127
Private Use 128-255