Skip to content
Scala implementation of Networking and Cryptography (NaCl) library
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.

NaCl4s - NaCl library for Scala

Build Status


NaCl represents modern and powerful crypto library. That implementation was inspired by projects libsodium and kalium

Currently it has minimal functionality (box, secret box and signatures) based on algorithms:

  • Salsa20
  • HSalsa20
  • XSalsa20
  • Poly1305
  • Curve25519
  • Sha512
  • Ed25519


NaCl4s is published at Maven Central. Simply use the following sbt snippet:

libraryDependencies ++= Seq(
  "com.github.emstlk" %% "nacl4s" % "1.0.0"

Using the library

Public-key authenticated encryption

This approach allows you to encrypt a secret message for your friend, using friend's public key. You can read more details here

import com.emstlk.nacl4s._

val myKeys = KeyPair()
val friendKeys = KeyPair()

val myBox = Box(friendKeys.publicKey, myKeys.privateKey)
val nonce = Box.randomNonce()
val encrypted = myBox.encrypt(nonce, "See you tomorrow at my favourite place 😎️".asBytes)

val friendBox = Box(myKeys.publicKey, friendKeys.privateKey)
val message = friendBox.decrypt(nonce, encrypted).asString

Secret-key authenticated encryption

In that case a single key is used to encrypt and decrypt messages. More details here

import com.emstlk.nacl4s._

val myBox = SecretBox.withRandomKey()
val key = myBox.key
val nonce = SecretBox.randomNonce()
val encrypted = myBox.encrypt(nonce, "Just another message".asBytes)

val friendBox = SecretBox(key)
val message = friendBox.decrypt(nonce, encrypted).asString

Public-key signatures

You can generate a key pair which allow you sign any message and anybody can verify it with your public key. More details here

import com.emstlk.nacl4s._

val keys = SigningKeyPair()
val message = "The new one message".asBytes
val signature = SigningKey(keys.privateKey).sign(message)

VerifyKey(keys.publicKey).verify(message, signature)


NaCl4s is still a work in progress

You can’t perform that action at this time.