Outlook Dev: Algorithms to calculate the Store Hash Number and encode EntryID, AttachmentId

In MSDN, I came across the following two posts as part of Store API which talks about two algorithms that Microsoft Office Outlook uses,

Algorithm to Calculate the Store Hash Number to calculate a store hash number based on the store mapping signature or entry ID and the store file nameā€¦
Algorithm to Encode Entry IDs and Attachment IDs to Encode Entry IDs and Attachment IDs