guid_hash_data

Returns a GUID for some data.

This uses a hash and so even small differences in the data will produce radically different return values.

The implementation is taken from RFC4122, Section 4.1.3; specifically using a type-5 SHA-1 hash.

Parameters:

data	data to hash
datasz	length of data
flags	GUID flags, e.g. fwupd_guid_flag_namespace_microsoft

Returns:

a new GUID, or null for internal error