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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { assert } from "../testing/asserts.ts";
/** Compare to array buffers or data views in a way that timing based attacks * cannot gain information about the platform. */export function timingSafeEqual( 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;}