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74 lines
1.9 KiB
TypeScript
74 lines
1.9 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// TODO(petamoriken): enable prefer-primordials for node polyfills
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// deno-lint-ignore-file prefer-primordials
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import { Buffer } from "node:buffer";
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export const MAX_RANDOM_VALUES = 65536;
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export const MAX_SIZE = 4294967295;
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function generateRandomBytes(size: number) {
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if (size > MAX_SIZE) {
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throw new RangeError(
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`The value of "size" is out of range. It must be >= 0 && <= ${MAX_SIZE}. Received ${size}`,
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);
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}
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const bytes = Buffer.allocUnsafe(size);
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//Work around for getRandomValues max generation
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if (size > MAX_RANDOM_VALUES) {
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for (let generated = 0; generated < size; generated += MAX_RANDOM_VALUES) {
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globalThis.crypto.getRandomValues(
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bytes.slice(generated, generated + MAX_RANDOM_VALUES),
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);
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}
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} else {
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globalThis.crypto.getRandomValues(bytes);
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}
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return bytes;
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}
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/**
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* @param size Buffer length, must be equal or greater than zero
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*/
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export default function randomBytes(size: number): Buffer;
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export default function randomBytes(
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size: number,
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cb?: (err: Error | null, buf?: Buffer) => void,
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): void;
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export default function randomBytes(
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size: number,
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cb?: (err: Error | null, buf?: Buffer) => void,
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): Buffer | void {
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if (typeof cb === "function") {
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let err: Error | null = null, bytes: Buffer;
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try {
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bytes = generateRandomBytes(size);
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} catch (e) {
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//NodeJS nonsense
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//If the size is out of range it will throw sync, otherwise throw async
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if (
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e instanceof RangeError &&
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e.message.includes('The value of "size" is out of range')
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) {
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throw e;
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} else if (e instanceof Error) {
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err = e;
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} else {
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err = new Error("[non-error thrown]");
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}
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}
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setTimeout(() => {
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if (err) {
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cb(err);
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} else {
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cb(null, bytes);
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}
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}, 0);
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} else {
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return generateRandomBytes(size);
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}
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}
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