pw-to-ek

Derive a secure encryption key from a password using sodium's scrypt implementation.

`` javascript
const generate = require('pw-to-ek')
const sodium = require('sodium-native')
const salt = b4a.alloc(sodium.crypto_pwhash_scryptsalsa208sha256_SALTBYTES)
const key = await generate('password', salt)
console.log(key) // 102 bytes Buffer
``