code: function(senderPriv, recipientPub, msg) {
      // Errors
      if (!senderPriv || !recipientPub || !msg) throw new Error('Missing argument !');
      if (!Helpers.isPrivateKeyValid(senderPriv)) throw new Error('Private key is not valid !');
      if (!Helpers.isPublicKeyValid(recipientPub)) throw new Error('Public key is not valid !');
      // Processing
      let iv = nacl.randomBytes(16)
      //console.log("IV:", convert.ua2hex(iv));
      let salt = nacl.randomBytes(32)
      let encoded = _encode(senderPriv, recipientPub, msg, iv, salt);
      // Result
      return encoded;
  }
docs: Encode a message
  
  @param {string} senderPriv - A sender private key
  @param {string} recipientPub - A recipient public key
  @param {string} msg - A text message
  
  @return {string} - The encoded message