Compute, and display, a HASH from a file.

[FrankB]

Hi Phil,

I have had a request to add a HASH function in ExifToolGUI:
https://github.com/FrankBijnen/ExifToolGui/issues/830

I think it is a valid request and could be useful. So I would like to add that in GUI. I looks like I can code computing a HASH (SHA-1, SHA-2, or MD5) quite easily in Delphi, no problems there. But I am wondering: Wouldn't it be a good addition for ExifTool to be able to compute a HASH of a file and display that as a 'pseudo'/'composite' tag?

Frank

[greybeard]

How about -ImageDataHash? Can be set to one of 'MD5', 'SHA256' or 'SHA512' Not quite the same thing but close.

[FrankB]

Thanks for your reply Greybeard.

I would have to ask the original requester of the issue, who is using it for 'digital forensics'. But my guess is that the HASH needs to be including the Metadata.

[Phil Harvey]

If he wants a hash of the whole file then it would be better to do this outside of ExifTool because the hash algorithms I've had to implement in Perl are very slow.

- Phil

[FrankB]

Thanks for your answer, Phil.

Will implement it in Delphi.

Frank

[StarGeek]

Here's a previous config file for getting an MD5 hash of a file as a tag. It requires having md5 on the system, which I don't think is default on Windows.

[FrankB]

which I don't think is default on Windows.

Correct. Not on mine at least.