thegamer/Cable-Desktop
2
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

Disable the real webcrypto

Browse source 
Sadly, we are not quite compliant with the WC3 webcrypto spec
due to our insistance on passing around key data in plain old
ArrayBuffers.

Also converted whitespace.
This commit is contained in:
lilia 2014-10-23 20:45:09 -07:00
parent c6aae62151
commit a4b25f7df1
1 changed files with 75 additions and 75 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

150
js/webcrypto.js
View file

@ -1,4 +1,4 @@
/* vim: ts=4:sw=4 /* vim: ts=4:sw=4:expandtab
* *
* This program is free software: you can redistribute it and/or modify * This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by * it under the terms of the GNU Lesser General Public License as published by
@ -17,85 +17,85 @@
/* Web Crypto polyfill. TODO: replace with web crypto */ /* Web Crypto polyfill. TODO: replace with web crypto */
// All inputs/outputs are arraybuffers! // All inputs/outputs are arraybuffers!
window.crypto.subtle = (function() { window.crypto.subtle = (function() {
if (window.crypto.subtle !== undefined && window.crypto.subtle !== null) { /* if (window.crypto.subtle !== undefined && window.crypto.subtle !== null) {
return window.crypto.subtle; return window.crypto.subtle;
} else { } else*/ {
var StaticArrayBufferProto = new ArrayBuffer().__proto__; var StaticArrayBufferProto = new ArrayBuffer().__proto__;
function assertIsArrayBuffer(thing) { function assertIsArrayBuffer(thing) {
if (thing !== Object(thing) || thing.__proto__ != StaticArrayBufferProto) if (thing !== Object(thing) || thing.__proto__ != StaticArrayBufferProto)
throw new Error("Needed a ArrayBuffer"); throw new Error("Needed a ArrayBuffer");
} }
// private implementation functions // private implementation functions
function HmacSHA256(key, input) { function HmacSHA256(key, input) {
assertIsArrayBuffer(key); assertIsArrayBuffer(key);
assertIsArrayBuffer(input); assertIsArrayBuffer(input);
return CryptoJS.HmacSHA256( return CryptoJS.HmacSHA256(
CryptoJS.lib.WordArray.create(toArrayBuffer(input)), CryptoJS.lib.WordArray.create(toArrayBuffer(input)),
CryptoJS.enc.Latin1.parse(getString(key)) CryptoJS.enc.Latin1.parse(getString(key))
).toString(CryptoJS.enc.Latin1); ).toString(CryptoJS.enc.Latin1);
}; };
function encryptAESCTR(plaintext, key, counter) { function encryptAESCTR(plaintext, key, counter) {
assertIsArrayBuffer(plaintext); assertIsArrayBuffer(plaintext);
assertIsArrayBuffer(key); assertIsArrayBuffer(key);
assertIsArrayBuffer(counter); assertIsArrayBuffer(counter);
return CryptoJS.AES.encrypt(CryptoJS.enc.Latin1.parse(getString(plaintext)), return CryptoJS.AES.encrypt(CryptoJS.enc.Latin1.parse(getString(plaintext)),
CryptoJS.enc.Latin1.parse(getString(key)), CryptoJS.enc.Latin1.parse(getString(key)),
{mode: CryptoJS.mode.CTR, iv: CryptoJS.enc.Latin1.parse(getString(counter)), {mode: CryptoJS.mode.CTR, iv: CryptoJS.enc.Latin1.parse(getString(counter)),
padding: CryptoJS.pad.NoPadding}) padding: CryptoJS.pad.NoPadding})
.ciphertext.toString(CryptoJS.enc.Latin1); .ciphertext.toString(CryptoJS.enc.Latin1);
}; };
function decryptAESCTR(ciphertext, key, counter) { function decryptAESCTR(ciphertext, key, counter) {
assertIsArrayBuffer(ciphertext); assertIsArrayBuffer(ciphertext);
assertIsArrayBuffer(key); assertIsArrayBuffer(key);
assertIsArrayBuffer(counter); assertIsArrayBuffer(counter);
return CryptoJS.AES.decrypt(btoa(getString(ciphertext)), return CryptoJS.AES.decrypt(btoa(getString(ciphertext)),
CryptoJS.enc.Latin1.parse(getString(key)), CryptoJS.enc.Latin1.parse(getString(key)),
{mode: CryptoJS.mode.CTR, iv: CryptoJS.enc.Latin1.parse(getString(counter)), {mode: CryptoJS.mode.CTR, iv: CryptoJS.enc.Latin1.parse(getString(counter)),
padding: CryptoJS.pad.NoPadding}) padding: CryptoJS.pad.NoPadding})
.toString(CryptoJS.enc.Latin1); .toString(CryptoJS.enc.Latin1);
}; };
function decryptAESCBC(ciphertext, key, iv) { function decryptAESCBC(ciphertext, key, iv) {
assertIsArrayBuffer(ciphertext); assertIsArrayBuffer(ciphertext);
assertIsArrayBuffer(key); assertIsArrayBuffer(key);
assertIsArrayBuffer(iv); assertIsArrayBuffer(iv);
return CryptoJS.AES.decrypt(btoa(getString(ciphertext)), return CryptoJS.AES.decrypt(btoa(getString(ciphertext)),
CryptoJS.enc.Latin1.parse(getString(key)), CryptoJS.enc.Latin1.parse(getString(key)),
{iv: CryptoJS.enc.Latin1.parse(getString(iv))}) {iv: CryptoJS.enc.Latin1.parse(getString(iv))})
.toString(CryptoJS.enc.Latin1); .toString(CryptoJS.enc.Latin1);
}; };
// utility function for connecting front and back ends via promises // utility function for connecting front and back ends via promises
// Takes an implementation function and 0 or more arguments // Takes an implementation function and 0 or more arguments
function promise(implementation) { function promise(implementation) {
var args = Array.prototype.slice.call(arguments); var args = Array.prototype.slice.call(arguments);
args.shift(); args.shift();
return Promise.resolve(toArrayBuffer(implementation.apply(this, args))); return Promise.resolve(toArrayBuffer(implementation.apply(this, args)));
} }
// public interface functions // public interface functions
function encrypt(algorithm, key, data) { function encrypt(algorithm, key, data) {
if (algorithm.name === "AES-CTR") if (algorithm.name === "AES-CTR")
return promise(encryptAESCTR, data, key, algorithm.counter); return promise(encryptAESCTR, data, key, algorithm.counter);
}; };
function decrypt(algorithm, key, data) { function decrypt(algorithm, key, data) {
if (algorithm.name === "AES-CTR") if (algorithm.name === "AES-CTR")
return promise(decryptAESCTR, data, key, algorithm.counter); return promise(decryptAESCTR, data, key, algorithm.counter);
if (algorithm.name === "AES-CBC") if (algorithm.name === "AES-CBC")
return promise(decryptAESCBC, data, key, algorithm.iv); return promise(decryptAESCBC, data, key, algorithm.iv);
}; };
function sign(algorithm, key, data) { function sign(algorithm, key, data) {
if (algorithm.name === "HMAC" && algorithm.hash === "SHA-256") if (algorithm.name === "HMAC" && algorithm.hash === "SHA-256")
return promise(HmacSHA256, key, data); return promise(HmacSHA256, key, data);
}; };
return { return {
encrypt : encrypt, encrypt : encrypt,
decrypt : decrypt, decrypt : decrypt,
sign : sign, sign : sign,
} }
} }
})(); })();