The "sha3sum" command:
Usage: fossil sha3sum FILE...
Compute an SHA3 checksum of all files named on the command-line.
If a file is named "-" then take its content from standard input.
To be clear: The official NIST FIPS-202 implementation of SHA3
with the added 01 padding is used, not the original Keccak submission.
--224 Compute a SHA3-224 hash
--256 Compute a SHA3-256 hash (the default)
--384 Compute a SHA3-384 hash
--512 Compute a SHA3-512 hash
--size N An N-bit hash. N must be a multiple of 32 between 128