k12sum

README

k12sum

Compute and checks Kangaroo12 (draft 10) checksums with a similar interface as sha256sum.

Install

$ go install github.com/bwesterb/k12sum

Create checksum

To create checksums, simply pass filenames as arguments.

$ k12sum 342.pdf 770.pdf
e93b2486ad166a75a2162d7b315b70e200becfe50c948f8f61be7d514df2f683  342.pdf
e04541f3389df0e6944d0ddef466c97495d769025c400b3527126d83dec515e9  770.pdf

For stdin use -. Without any arguments, k12sum will read from stdin.

$ k12sum < 342.pdf
e93b2486ad166a75a2162d7b315b70e200becfe50c948f8f61be7d514df2f683  -

Check

Use -c to check.

$ cat K12SUMS
e93b2486ad166a75a2162d7b315b70e200becfe50c948f8f61be7d514df2f683  342.pdf
e04541f3389df0e6944d0ddef466c97495d769025c400b3527126d83dec515e9  770.pdf
$ k12sum -c K12SUMS               
342.pdf: OK
770.pdf: OK
$ echo $?
0

Performance

At the moment, on M2 Pro, k12sum seems to be bottlenecked either by macOS' or Go's I/O:

$ ls -lh bigfile       
-rw-r--r--  1 bas  staff   9.8G Jun 17 15:00 bigfile
$ time ./k12sum bigfile
2c0a4b64f562e436c24899f4fe3bdc2558a4bb5643a4977f3f1e2a9e2c978fd3  bigfile
./k12sum bigfile  4.64s user 1.22s system 444% cpu 1.316 total

That's only 8GB/s. Should be plenty for most applications.