A binding for crypto_core_hsalsa20

[kromancer]

Noob alert!

My fellow raccoons, is there any binding for crypto_core_hsalsa20 in this glorious python package?

[lmctv]

To my knowledge, the hsalsa and its sibling hchacha key derivation primitives are only used as building blocks for the xsalsa and xchacha constructions. While I don't think anyone would object to well-constructed PRs implementing low-level bindings for them, I don't expect to implement such bindings myself without a clear use case.