How are credentials stored and encrypted in Nexus OSS 2.14?

Question

I couldn’t finy anything in the documentation, knowledge base nor on the web on how credentials (local users) are stored by Nexus OSS 2.14.

The only hint was a release note of 2.5 about introducing salted hashes.

Where in the data dir are credentials saved? What algorithms are used to encrypt them?

I’m thankful for any hint.