PyCRYPTHASH = CryptCreateHash(Algid, Key
, Flags
)
Creates a hash object for hashing large amounts of data
Parameters
Algid : int
An algorithm identifier, CALG_*.Key=None : PyCRYPTKEY
Used only for keyed hashes (MAC
or HMAC), use None otherwise
Flags=0 : int
Reserved, use 0 if passed in