async function encryptDataSaveKey() {
	var data = await makeData();
	console.log("generated data", data);
	var keys = await makeKeys()
	var encrypted = await encrypt(data, keys);
	callOnStore(function (store) {
		store.put({id: 1, keys: keys, encrypted: encrypted});
	})
}

function loadKeyDecryptData() {
	callOnStore(function (store) {
    var getData = store.get(1);
    getData.onsuccess = async function() {
    	var keys = getData.result.keys;
      var encrypted = getData.result.encrypted;
			var data = await decrypt(encrypted, keys);
			console.log("decrypted data", data);
	   };
	})
}

function callOnStore(fn_) {

	// This works on all devices/browsers, and uses IndexedDBShim as a final fallback 
	var indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB || window.shimIndexedDB;

	// Open (or create) the database
	var open = indexedDB.open("MyDatabase", 1);

	// Create the schema
	open.onupgradeneeded = function() {
	    var db = open.result;
	    var store = db.createObjectStore("MyObjectStore", {keyPath: "id"});
	};


	open.onsuccess = function() {
	    // Start a new transaction
	    var db = open.result;
	    var tx = db.transaction("MyObjectStore", "readwrite");
	    var store = tx.objectStore("MyObjectStore");

	    fn_(store)


	    // Close the db when the transaction is done
	    tx.oncomplete = function() {
	        db.close();
	    };
	}
}

async function encryptDecrypt() {
	var data = await makeData();
	console.log("generated data", data);
	var keys = await makeKeys()
	var encrypted = await encrypt(data, keys);
	console.log("encrypted", encrypted);
	var finalData = await decrypt(encrypted, keys);
	console.log("decrypted data", data);
}





function makeData() {
	return window.crypto.getRandomValues(new Uint8Array(16))
}

function makeKeys() {
	return window.crypto.subtle.generateKey(
    {
        name: "RSA-OAEP",
        modulusLength: 2048, //can be 1024, 2048, or 4096
        publicExponent: new Uint8Array([0x01, 0x00, 0x01]),
        hash: {name: "SHA-256"}, //can be "SHA-1", "SHA-256", "SHA-384", or "SHA-512"
    },
    false, //whether the key is extractable (i.e. can be used in exportKey)
    ["encrypt", "decrypt"] //must be ["encrypt", "decrypt"] or ["wrapKey", "unwrapKey"]
   )
}

function encrypt(data, keys) {
	return window.crypto.subtle.encrypt(
    {
        name: "RSA-OAEP",
        //label: Uint8Array([...]) //optional
    },
    keys.publicKey, //from generateKey or importKey above
    data //ArrayBuffer of data you want to encrypt
)
}


async function decrypt(data, keys) {
	return new Uint8Array(await window.crypto.subtle.decrypt(
	    {
	        name: "RSA-OAEP",
	        //label: Uint8Array([...]) //optional
	    },
	    keys.privateKey, //from generateKey or importKey above
	    data //ArrayBuffer of the data
	));
}