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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<script type="application/javascript">
let db;
function err(resolve) {
return e => resolve(e.target.error.message);
}
function openDatabase() {
return new Promise((resolve, reject) => {
let request = indexedDB.open("keystore", 1);
request.onerror = err(reject);
request.onsuccess = function(event) {
db = event.target.result;
resolve();
};
request.onupgradeneeded = function(event) {
db = event.target.result;
let objectStore = db.createObjectStore("keys", {autoIncrement: true});
objectStore.transaction.oncomplete = resolve;
};
});
}
function storeKey(key) {
return new Promise((resolve, reject) => {
let transaction = db.transaction("keys", "readwrite");
transaction.objectStore("keys").put(key, key.type);
transaction.onabort = err(reject);
transaction.onerror = err(reject);
transaction.oncomplete = function() {
resolve(key);
};
});
}
function retrieveKey() {
return new Promise((resolve, reject) => {
let transaction = db.transaction("keys", "readonly");
let cursor = transaction.objectStore("keys").openCursor();
cursor.onerror = err(reject);
cursor.onabort = err(reject);
cursor.onsuccess = function(event) {
try {
let result = event.target.result;
resolve(result && result.value);
} catch (e) {
reject(e.message);
}
};
});
}
function generateKey() {
let algorithm = {
name: "RSASSA-PKCS1-v1_5",
hash: "SHA-256",
modulusLength: 1024,
publicExponent: new Uint8Array([0x01, 0x00, 0x01]),
};
return crypto.subtle.generateKey(algorithm, true, ["sign", "verify"]);
}
openDatabase()
.then(retrieveKey).then(generateKey).then(storeKey)
.then(() => parent.postMessage("ok", "*"))
.catch(error => {
parent.postMessage(String(error), "*");
});
</script>
</body>
</html>