mirror of
https://github.com/denoland/deno.git
synced 2024-12-14 19:37:59 -05:00
47 lines
1.3 KiB
TypeScript
47 lines
1.3 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
|
|
|
|
// TODO(petamoriken): enable prefer-primordials for node polyfills
|
|
// deno-lint-ignore-file prefer-primordials
|
|
|
|
import { Buffer } from "node:buffer";
|
|
|
|
function assert(cond) {
|
|
if (!cond) {
|
|
throw new Error("assertion failed");
|
|
}
|
|
}
|
|
|
|
/** Compare to array buffers or data views in a way that timing based attacks
|
|
* cannot gain information about the platform. */
|
|
function stdTimingSafeEqual(
|
|
a: ArrayBufferView | ArrayBufferLike | DataView,
|
|
b: ArrayBufferView | ArrayBufferLike | DataView,
|
|
): boolean {
|
|
if (a.byteLength !== b.byteLength) {
|
|
return false;
|
|
}
|
|
if (!(a instanceof DataView)) {
|
|
a = new DataView(ArrayBuffer.isView(a) ? a.buffer : a);
|
|
}
|
|
if (!(b instanceof DataView)) {
|
|
b = new DataView(ArrayBuffer.isView(b) ? b.buffer : b);
|
|
}
|
|
assert(a instanceof DataView);
|
|
assert(b instanceof DataView);
|
|
const length = a.byteLength;
|
|
let out = 0;
|
|
let i = -1;
|
|
while (++i < length) {
|
|
out |= a.getUint8(i) ^ b.getUint8(i);
|
|
}
|
|
return out === 0;
|
|
}
|
|
|
|
export const timingSafeEqual = (
|
|
a: Buffer | DataView | ArrayBuffer,
|
|
b: Buffer | DataView | ArrayBuffer,
|
|
): boolean => {
|
|
if (a instanceof Buffer) a = new DataView(a.buffer);
|
|
if (a instanceof Buffer) b = new DataView(a.buffer);
|
|
return stdTimingSafeEqual(a, b);
|
|
};
|