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// 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 toDataView(ab: ArrayBufferLike | ArrayBufferView): DataView {
if (ArrayBuffer.isView(ab)) {
return new DataView(ab.buffer, ab.byteOffset, ab.byteLength);
}
return new DataView(ab);
}
/** 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 = toDataView(a);
}
if (!(b instanceof DataView)) {
b = toDataView(b);
}
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, a.byteOffset, a.byteLength);
}
if (b instanceof Buffer) {
b = new DataView(b.buffer, b.byteOffset, b.byteLength);
}
return stdTimingSafeEqual(a, b);
};
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