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Reading/writing part of file

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Access locked and protected files in Windows, read and write disks and partitions and more.
Posted: 11/09/2012 03:58:35
by Nikita  (Basic support level)
Joined: 10/25/2012
Posts: 2

When I read/write data from encrypted stream, and I need only few bytes, will the stored file be decrypted entirely? How much perfomance will it cost? Does it depends on encryption method? If existing methods doesn't provide this, can I implement my own with your SDK?
Posted: 11/09/2012 04:12:58
by Alexander Plas (EldoS Corp.)


Only a part of the file's data will be decrypted and then encrypted if you have changed the file's data. The data in the SolFS storage organized in pages which size you specify on storage creation. It is very similar to the clusters of the usual file systems, but in SolFS every page has a 32 bytes header which is never encrypted. So, if you don't use compression the file's data will be encrypted and decrypted page by page. If the compression is used few page are handled together.

The scheme of pages encryption is a part of the SolFS design and cannot be changed via custom encryption callbacks.

According to our measurements the encryption takes a very little time in compare to disk I/O operations.

BTW. We speak Ukrainian and Russian



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