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session-desktop
mirror of https://github.com/oxen-io/session-desktop
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Code Issues 8 Projects 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.
pull/749/head
lilia 11 years ago
parent c6aae62151
commit a4b25f7df1
1 changed files with 75 additions and 75 deletions
Show Stats Download Patch File Download Diff File

150
js/webcrypto.js
Unescape Escape 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
* 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 */
// All inputs/outputs are arraybuffers!
window.crypto.subtle = (function() {
if (window.crypto.subtle !== undefined && window.crypto.subtle !== null) {
return window.crypto.subtle;
} else {
var StaticArrayBufferProto = new ArrayBuffer().__proto__;
function assertIsArrayBuffer(thing) {
if (thing !== Object(thing) || thing.__proto__ != StaticArrayBufferProto)
throw new Error("Needed a ArrayBuffer");
}
/* if (window.crypto.subtle !== undefined && window.crypto.subtle !== null) {
return window.crypto.subtle;
} else*/ {
var StaticArrayBufferProto = new ArrayBuffer().__proto__;
function assertIsArrayBuffer(thing) {
if (thing !== Object(thing) || thing.__proto__ != StaticArrayBufferProto)
throw new Error("Needed a ArrayBuffer");
}
// private implementation functions
function HmacSHA256(key, input) {
assertIsArrayBuffer(key);
assertIsArrayBuffer(input);
return CryptoJS.HmacSHA256(
CryptoJS.lib.WordArray.create(toArrayBuffer(input)),
CryptoJS.enc.Latin1.parse(getString(key))
).toString(CryptoJS.enc.Latin1);
};
// private implementation functions
function HmacSHA256(key, input) {
assertIsArrayBuffer(key);
assertIsArrayBuffer(input);
return CryptoJS.HmacSHA256(
CryptoJS.lib.WordArray.create(toArrayBuffer(input)),
CryptoJS.enc.Latin1.parse(getString(key))
).toString(CryptoJS.enc.Latin1);
};
function encryptAESCTR(plaintext, key, counter) {
assertIsArrayBuffer(plaintext);
assertIsArrayBuffer(key);
assertIsArrayBuffer(counter);
return CryptoJS.AES.encrypt(CryptoJS.enc.Latin1.parse(getString(plaintext)),
CryptoJS.enc.Latin1.parse(getString(key)),
{mode: CryptoJS.mode.CTR, iv: CryptoJS.enc.Latin1.parse(getString(counter)),
padding: CryptoJS.pad.NoPadding})
.ciphertext.toString(CryptoJS.enc.Latin1);
};
function encryptAESCTR(plaintext, key, counter) {
assertIsArrayBuffer(plaintext);
assertIsArrayBuffer(key);
assertIsArrayBuffer(counter);
return CryptoJS.AES.encrypt(CryptoJS.enc.Latin1.parse(getString(plaintext)),
CryptoJS.enc.Latin1.parse(getString(key)),
{mode: CryptoJS.mode.CTR, iv: CryptoJS.enc.Latin1.parse(getString(counter)),
padding: CryptoJS.pad.NoPadding})
.ciphertext.toString(CryptoJS.enc.Latin1);
};
function decryptAESCTR(ciphertext, key, counter) {
assertIsArrayBuffer(ciphertext);
assertIsArrayBuffer(key);
assertIsArrayBuffer(counter);
return CryptoJS.AES.decrypt(btoa(getString(ciphertext)),
CryptoJS.enc.Latin1.parse(getString(key)),
{mode: CryptoJS.mode.CTR, iv: CryptoJS.enc.Latin1.parse(getString(counter)),
padding: CryptoJS.pad.NoPadding})
.toString(CryptoJS.enc.Latin1);
};
function decryptAESCTR(ciphertext, key, counter) {
assertIsArrayBuffer(ciphertext);
assertIsArrayBuffer(key);
assertIsArrayBuffer(counter);
return CryptoJS.AES.decrypt(btoa(getString(ciphertext)),
CryptoJS.enc.Latin1.parse(getString(key)),
{mode: CryptoJS.mode.CTR, iv: CryptoJS.enc.Latin1.parse(getString(counter)),
padding: CryptoJS.pad.NoPadding})
.toString(CryptoJS.enc.Latin1);
};
function decryptAESCBC(ciphertext, key, iv) {
assertIsArrayBuffer(ciphertext);
assertIsArrayBuffer(key);
assertIsArrayBuffer(iv);
return CryptoJS.AES.decrypt(btoa(getString(ciphertext)),
CryptoJS.enc.Latin1.parse(getString(key)),
{iv: CryptoJS.enc.Latin1.parse(getString(iv))})
.toString(CryptoJS.enc.Latin1);
};
function decryptAESCBC(ciphertext, key, iv) {
assertIsArrayBuffer(ciphertext);
assertIsArrayBuffer(key);
assertIsArrayBuffer(iv);
return CryptoJS.AES.decrypt(btoa(getString(ciphertext)),
CryptoJS.enc.Latin1.parse(getString(key)),
{iv: CryptoJS.enc.Latin1.parse(getString(iv))})
.toString(CryptoJS.enc.Latin1);
};
// utility function for connecting front and back ends via promises
// Takes an implementation function and 0 or more arguments
function promise(implementation) {
var args = Array.prototype.slice.call(arguments);
args.shift();
return Promise.resolve(toArrayBuffer(implementation.apply(this, args)));
}
// utility function for connecting front and back ends via promises
// Takes an implementation function and 0 or more arguments
function promise(implementation) {
var args = Array.prototype.slice.call(arguments);
args.shift();
return Promise.resolve(toArrayBuffer(implementation.apply(this, args)));
}
// public interface functions
function encrypt(algorithm, key, data) {
if (algorithm.name === "AES-CTR")
return promise(encryptAESCTR, data, key, algorithm.counter);
};
function decrypt(algorithm, key, data) {
if (algorithm.name === "AES-CTR")
return promise(decryptAESCTR, data, key, algorithm.counter);
if (algorithm.name === "AES-CBC")
return promise(decryptAESCBC, data, key, algorithm.iv);
};
function sign(algorithm, key, data) {
if (algorithm.name === "HMAC" && algorithm.hash === "SHA-256")
return promise(HmacSHA256, key, data);
};
// public interface functions
function encrypt(algorithm, key, data) {
if (algorithm.name === "AES-CTR")
return promise(encryptAESCTR, data, key, algorithm.counter);
};
function decrypt(algorithm, key, data) {
if (algorithm.name === "AES-CTR")
return promise(decryptAESCTR, data, key, algorithm.counter);
if (algorithm.name === "AES-CBC")
return promise(decryptAESCBC, data, key, algorithm.iv);
};
function sign(algorithm, key, data) {
if (algorithm.name === "HMAC" && algorithm.hash === "SHA-256")
return promise(HmacSHA256, key, data);
};
return {
encrypt : encrypt,
decrypt : decrypt,
sign : sign,
}
}
return {
encrypt : encrypt,
decrypt : decrypt,
sign : sign,
}
}
})();

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