I have file that I need to hash, this file can be too large to read into memory at one time, so I need a way using gcrypt to hash the file in more manageable sized chunks how can I do this?
Thank you
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I have file that I need to hash, this file can be too large to read into memory at one time, so I need a way using gcrypt to hash the file in more manageable sized chunks how can I do this?
Thank you
I found how to do this:
The
gcrypthandle is valid and builds upon its input so that whether you write five 1k chunks to the handle or one 5k chunk of data the hash is the same either way. The hash itself is not finalized until you attempt to read it, so you can sit in a loop reading chunks of a large file at a time out and passing them togcryptand thus prevent yourself from ever having too much in memory at one time.