COM API Checkum Functions in REST API

Hi All, 

The only mention of checksum is in the COM API with the functions of FindFilesByChecksumWithStringDigests and FindFilesByChecksumWithNumbersDigest.

I am wondering if there is anything like this in the REST API? I have searched documentation but nothing pops up with anything related to Checksum in the REST API. 

Pretty much what I am trying to do is search the vault for a checksum that matches a checksum I give it. 

So two questions:

1. Any way to get the functionality of the COM API checksum in the REST API?'

2. If I give it an MD5 hash, how is it checking for checksum if y'alls hash is proprietary? Is it decoding the proprietary part and checking against the MD5 hash after? 

Appreciate the insight!

Thanks!