denoland-deno/extensions/crypto/01_crypto.js

// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
"use strict";

((window) => {
  const core = window.Deno.core;
  const webidl = window.__bootstrap.webidl;

  class Crypto {
    constructor() {
      webidl.illegalConstructor();
    }

    getRandomValues(arrayBufferView) {
      webidl.assertBranded(this, Crypto);
      const prefix = "Failed to execute 'getRandomValues' on 'Crypto'";
      webidl.requiredArguments(arguments.length, 1, { prefix });
      arrayBufferView = webidl.converters.ArrayBufferView(arrayBufferView, {
        prefix,
        context: "Argument 1",
      });
      if (
        !(
          arrayBufferView instanceof Int8Array ||
          arrayBufferView instanceof Uint8Array ||
          arrayBufferView instanceof Int16Array ||
          arrayBufferView instanceof Uint16Array ||
          arrayBufferView instanceof Int32Array ||
          arrayBufferView instanceof Uint32Array ||
          arrayBufferView instanceof Uint8ClampedArray
        )
      ) {
        throw new DOMException(
          "The provided ArrayBufferView is not an integer array type",
          "TypeMismatchError",
        );
      }
      const ui8 = new Uint8Array(
        arrayBufferView.buffer,
        arrayBufferView.byteOffset,
        arrayBufferView.byteLength,
      );
      core.opSync("op_crypto_get_random_values", ui8);
      return arrayBufferView;
    }

    randomUUID() {
      webidl.assertBranded(this, Crypto);
      return core.opSync("op_crypto_random_uuid");
    }

    get [Symbol.toStringTag]() {
      return "Crypto";
    }

    [Symbol.for("Deno.customInspect")](inspect) {
      return `${this.constructor.name} ${inspect({})}`;
    }
  }

  window.__bootstrap.crypto = {
    crypto: webidl.createBranded(Crypto),
    Crypto,
  };
})(this);