We implemented everything once requested and voted up by users.
It's mostly for compatibility and convenience.
Use whatever you deem useful for your case.
Core set
hashsum - print remote hashes
checksum - compare remote against sum file
check - compare hashes between two remotes
Shortcuts (just for convenience)
md5sum sha1sum
just aliases for hashsum md5/sha1
widely requested
for compatibility with unix coreutils
md5sum/sha1sum/hashsum -C
just aliases for checksum
converting printer commands into checksum checker
for compatibility with unix coreutils