How to hash without salt?

[VityaSchel]

I really need to hash without salt (https://docs.oxen.io/oxen-docs/products-built-on-oxen/session/loki-name-system-for-session) and by that I mean salt that is equal to 0 bytes but when I try saltLength: 0 or salt: Buffer.alloc(0), argon2 throws [Error: Salt is too short]

[ranisalt]

You can't, Argon2 does not support hashing without salt. The implementation of Argon2 expected in this document is not compliant with the reference one

[ranisalt]

It seems the documentation you sent is incorrect. This product uses libsodium and that requires a fixed salt length of 16 bytes. They simply initialize it with a zeroed buffer.

https://github.com/oxen-io/oxen-core/blob/7bda65c5d2f615c317682ee82cd8251d35a60b69/src/cryptonote_core/oxen_name_system.cpp#L1725-L1740

You likely can achieve the same hashes by passing { salt: Buffer.alloc(16) } as the second param for hash