Checksum format test

Tests that the specified checksum formats are supported and that invalid formats are handled gracefully.

1. Perform a GetChecksum without any salt
   This should return the same checksums for all pillars.
2. Perform a GetChecksum with a correct salt (even number of characters, hexvalues).
   This should return the same checksums for all pillars. 
3. Perform a GetChecksum with a invalid character salt (e.g. æøå??§§§)
   Should generate a failure, informing that the salt format is invalid. 
4. Perform a GetChecksum with a odd length of characters (e.g. "abcde")
   Should generate a failure, informing that the salt format is invalid.