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Improve new media-tag

pull/1/head
yflory 2018-06-07 11:47:48 +02:00
parent 87f4fe9c84
commit 38887eb088
1 changed files with 7 additions and 29 deletions
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36
www/mediatag/media-tag.js
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@ -4,7 +4,6 @@
else { this[name] = definition(); }
}('MediaTag', function() {
var cache;
var PARANOIA = true;
var cypherChunkLength = 131088;
// Save a blob on the file system
@ -106,38 +105,24 @@
var Decrypt = {
// Create a nonce
createNonce: function () {
if (!Array.prototype.fill) {
// IE support
var arr = [];
for (var i = 0; i < 24; i++) { arr[i] = 0; }
return new Uint8Array(arr);
}
return new Uint8Array(new Array(24).fill(0));
var n = new Uint8Array(24);
for (var i = 0; i < 24; i++) { n[i] = 0; }
return n;
},
// Increment a nonce
// FIXME: remove throw?
increment: function (N) {
var l = N.length;
while (l-- > 1) {
if (PARANOIA) {
if (typeof(N[l]) !== 'number') {
throw new Error('E_UNSAFE_TYPE');
}
if (N[l] > 255) {
throw new Error('E_OUT_OF_BOUNDS');
}
}
/* .jshint probably suspects this is unsafe because we lack types
but as long as this is only used on nonces, it should be safe */
if (N[l] !== 255) { return void N[l]++; } // jshint ignore:line
N[l] = 0;
// you don't need to worry about this running out.
// you'd need a REAAAALLY big file
if (l === 0) {
throw new Error('E_NONCE_TOO_LARGE');
}
if (l === 0) { throw new Error('E_NONCE_TOO_LARGE'); }
N[l] = 0;
}
},
@ -153,13 +138,6 @@
return Array.prototype.slice.call(u8);
},
// Gets the random key string.
getRandomKeyStr: function () {
var Nacl = window.nacl;
var rdm = Nacl.randomBytes(18);
return Nacl.util.encodeBase64(rdm);
},
// Gets the key from the key string.
getKeyFromStr: function (str) {
return window.nacl.util.decodeBase64(str);
@ -287,7 +265,7 @@
// Get blob URL
var url = decrypted.url;
if (!url) {
if (!url && window.URL) {
url = decrypted.url = window.URL.createObjectURL(new Blob([blob], {
type: metadata.type
}));