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denoland-deno/ext/node/polyfills/internal_binding/_timingSafeEqual.ts
Bartek Iwańczuk 72fe9bb470
refactor: rename InternalModuleLoader to ExtModuleLoader, use ext: scheme for snapshotted modules (#18041)
This commit renames "deno_core::InternalModuleLoader" to
"ExtModuleLoader" and changes the specifiers used by the 
modules loaded from this loader to "ext:".

"internal:" scheme was really ambiguous and it's more characters than
"ext:", which should result in slightly smaller snapshot size.

Closes https://github.com/denoland/deno/issues/18020
2023-03-08 12:44:54 +01:00

43 lines
1.2 KiB
TypeScript

// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { Buffer } from "ext:deno_node/buffer.ts";
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);
};