mORMot Open Source

ertank

Member

Registered: 2016-03-16

Posts: 163

SHA256 of a file

Hi,

I am mainly using SHA256 for the AES256 cryption. Recently, I needed to control if a file has changed. Size of the file is quite small (~20-30KB) and won't be increasing much. I thought I might save a SHA256 hash of the file somewhere and compare it to monitor "if file has changed"

When I tried to use SynCrypto.SHA256() I realize that it accepts RawByteString as a parameter. I believe, It may be used for file hashing, but I have no idea how to do that.

Is it possible to have an example of SynCrypto.SHA256() used for file hasing?

Thanks.

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 14,269

Website

Re: SHA256 of a file

Try using StringFromFile() function to return a RawByteString from the file name.

ertank

Member

Registered: 2016-03-16

Posts: 163

Re: SHA256 of a file

That did the job perfectly. Thank you.