Intro to fileproof

fileproof generates .svg QR-codes of sha2 checksums for files.

fileproof [filenames]

where [filenames] is any whitespace separated list of file names.

Example

Running the following in the base directory of the project:

fileproof Cargo.lock

gives

Why?

Mostly, I just wanted to practice rust.

I had a usecase where I needed to create evidence that I had a revision of a file without revealing the file itself. The easiest way is to write an email or mail something that includes a checksum of the files in question. As many people in my circle have phones capable of reading QR codes, and I don't want to need to trust someone to transcribe a checksum, combining them seemed appropriate.

Also, a .svg file can be turned nearly transparent and included in the background of html documents, allowing one to include it discretely in an email.

Here is an example.

Future work

Dependencies

• sha2
• qrcodegen

Acnowledgements

I used code from

License

Currently licensed under Apache2