I use SHA256 for Linux Mint, though can be tricky to find. While some prefers to examine the file on disk, I prefer copy/paste the checksum in download manager & select SHA256. If it's not right, the download will be aborted, if right, it's deposited where desired.
Hopefully Linux Mint will go to the SHA512 checksum.
BTW, here are all of the Linux MInt 18 SHA256 checksums.
In case the page doesn't post, they're listed below with a link to cover my back.
I'll readily admit, at one time, up until that Linux Mint Cinnamon deal, wasn't checking all of my Linux Mint ISO's, and for the first 5 years, never checked the first one. That has now changed, each & every one of us are personally responsible for our security. There are free download managers as extensions with the ability to check once the download is complete (it's doing the work for you), it's up to you to take charge & accept the offer. For Linux Mint 18 users, I've led everyone to water, though can't force one to drink. That decision rests upon the user.