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30 lines
886 B
TypeScript
30 lines
886 B
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import { sendSync } from "./dispatch_json.ts";
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import { assert } from "./util.ts";
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/** Synchronously collects cryptographically secure random values. The
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* underlying CSPRNG in use is Rust's `rand::rngs::ThreadRng`.
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*
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* const arr = new Uint8Array(32);
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* crypto.getRandomValues(arr);
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*/
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export function getRandomValues<
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T extends
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| Int8Array
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| Uint8Array
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| Uint8ClampedArray
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| Int16Array
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| Uint16Array
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| Int32Array
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| Uint32Array
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>(typedArray: T): T {
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assert(typedArray !== null, "Input must not be null");
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assert(typedArray.length <= 65536, "Input must not be longer than 65536");
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const ui8 = new Uint8Array(
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typedArray.buffer,
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typedArray.byteOffset,
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typedArray.byteLength
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);
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sendSync("op_get_random_values", {}, ui8);
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return typedArray;
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}
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