Key derivation using Argon2

argon2.go

// https://godoc.org/golang.org/x/crypto/argon2

package main

import (
  "crypto/rand"
  "encoding/hex"
  "fmt"

  "golang.org/x/crypto/argon2"
)

func makeToken(length uint) []byte {
  randomBytes := make([]byte, 32)
  _, err := rand.Read(randomBytes)
  if err != nil {
    panic(err)
  }
  return randomBytes[:length]
}

func main() {
  salt := makeToken(32)
  key := argon2.Key([]byte("some password"), salt, 4, 32*1024, 4, 32)
  fmt.Println("salt", hex.EncodeToString(salt), "\n", "key", hex.EncodeToString(key))
}