const nacl = require('tweetnacl')
const sodium = require('tweetsodium')

// generate public key to use for encryption and coresponding secret key to use
// for decryption
const keyPair = nacl.box.keyPair()

// encrypts message string using public key
function encrypt(message) {
    const encoder = new TextEncoder()
    const messageBytes = encoder.encode(message)

    return sodium.seal(messageBytes, keyPair.publicKey)
}

// decrypts message using secret key
function decrypt(ciphertext) {
    const encoder = new TextEncoder()
    const ciphertextBytes = encoder.encode(ciphertext)

    return sodium.sealOpen(ciphertextBytes, keyPair.publicKey, keyPair.secretKey)
}