This module offers an interface between several cryptographic block cipher libraries, as well as an interface to an RSA library. You can use it with nativescript.

See it in action

var crypto_module = require('crypto-module');
Object.keys(crypto_module.ivLength).forEach(function(algorithm) {
    console.log(algorithm); 
    var encrypted = "";
    var decrypted = "";
    var key = "";
    if(algorithm == 'caesar'){
        key = 28; 
    } else{
        key = "secret";
    }

    encrypted = crypto_module.encryptMessage('hallo 👄', key, algorithm); 
    console.log(encrypted);
    decrypted = crypto_module.decryptMessage(encrypted, key, algorithm);
    console.log(decrypted); 
    console.log("-----------------------")
});