Yes, it's clearly documented at https://developers.google.com/safe-browsing/v4/urls-hashing https://developers.google.com/safe-browsing/v4/urls-hashing. It's a

Yes, it's clearly documented at https://developers.google.com/safe-browsing/v4/urls-hashing https://developers.google.com/safe-browsing/v4/urls-hashing. It's a public API (with more than one compatible implementation) that anyone can use so it's not like the algorithm could be a secret.