can't use crypto_generichash_blake2b_salt_personal because of fixed length salt and personal

[sefai]

Hi all,

I am trying to derive a 32 byte key using the suggestion from jedisct1 , but the salt and personal length is fixed for HashSaltPersonal inputs. I need variable length since these will be get from the user, like a password and email. How can I implement this?

Regards,