Is it possible to retrieve a store hash from MrMAPI command-line interface?

[ajkessel]

MCMAPI has a "compute store hash" GUI option. Is there any way to do the same thing with MrMAPI from the command-line?

[ajkessel]

I've figured out a somewhat cumbersome workaround for this. mrmapi can be run with PR_STORE_ENTRYID to retrieve the Entry ID for each store, and then that value can be fed to the code below to generate a store hash, which in turn can be used to create a Crawl Scope Manager rule to exclude certain stores (and their associated PSTs) from the Windows Desktop Search index. (Along the lines of the solution outlined here.)

private static string ComputeHash(string storeEID)
        {
            int idx = 0;    // Index in buffer
            uint hash = 0;    // The hash
            int lengthStoreEID = storeEID.Length / 2; // Length of store EID -- divide by 2 because 2 text characters here represents 1 byte
            // --- Pass 1: Main block (multiple of dword, i.e. 4 bytes) ---
            int cdw = lengthStoreEID / sizeof(uint);    // cdw = Count Double Words (i.e. number of double words in the buffer)
            for (int i = 0; i < cdw; i++, idx += 8)
            {
                int dword = int.Parse(storeEID.Substring(idx, 8), System.Globalization.NumberStyles.HexNumber);
                hash = (hash << 5) + hash + (uint)IPAddress.HostToNetworkOrder(dword);
            }
            // --- Pass 2: Remainder of the block ---
            int cb = lengthStoreEID % sizeof(uint);    // cb = Count Bytes (i.e. number of bytes left in the buffer after pass 1)
            for (int j = 0; j < cb; idx++, j++)
            {
                hash = (hash << 5) + hash + byte.Parse(storeEID.Substring(idx, 2), System.Globalization.NumberStyles.HexNumber);
            }
            return hash.ToString("x");
        }
        private static string EncodeEID(string EID)
        {
            StringBuilder result = new StringBuilder(EID.Length);
            for (int i = 0; i < EID.Length; i += 2)
                result.Append((char)(byte.Parse(EID.Substring(i, 2), System.Globalization.NumberStyles.HexNumber) + 0xAC00));
            return result.ToString();
        }