Implement crypto.getRandomValues()

sjrd · web-flow · commit 136c2c409448 · 2022-06-18T21:18:36.000-04:00
diff --git a/lib/jsdom/browser/Window.js b/lib/jsdom/browser/Window.js
@@ -25,6 +25,7 @@ const External = require("../living/generated/External");
 const Navigator = require("../living/generated/Navigator");
 const Performance = require("../living/generated/Performance");
 const Screen = require("../living/generated/Screen");
+const Crypto = require("../living/generated/Crypto");
 const Storage = require("../living/generated/Storage");
 const Selection = require("../living/generated/Selection");
 const reportException = require("../living/helpers/runtime-script-errors");
@@ -339,6 +340,7 @@ function Window(options) {
   const navigator = Navigator.create(window, [], { userAgent: this._resourceLoader._userAgent });
   const performance = Performance.create(window, [], { rawPerformance });
   const screen = Screen.create(window);
+  const crypto = Crypto.create(window);
   const customElementRegistry = CustomElementRegistry.create(window);
 
   define(this, {
@@ -402,6 +404,9 @@ function Window(options) {
     get screen() {
       return screen;
     },
+    get crypto() {
+      return crypto;
+    },
     get origin() {
       return window._origin;
     },
diff --git a/lib/jsdom/living/crypto/Crypto-impl.js b/lib/jsdom/living/crypto/Crypto-impl.js
@@ -0,0 +1,47 @@
+"use strict";
+
+const nodeCrypto = require("crypto");
+const DOMException = require("domexception/webidl2js-wrapper");
+
+// https://w3c.github.io/webcrypto/#crypto-interface
+class CryptoImpl {
+  constructor(globalObject) {
+    this._globalObject = globalObject;
+  }
+
+  // https://w3c.github.io/webcrypto/#Crypto-method-getRandomValues
+  getRandomValues(array) {
+    // Note: this rejects Float32Array, Float64Array and DataView.
+    //
+    // We perform "instance tests" by comparing `array.constructor.name` so
+    // that the tests will be successful across realms.
+    const typeName = array.constructor.name;
+    if (!(typeName === "Int8Array" ||
+        typeName === "Uint8Array" ||
+        typeName === "Uint8ClampedArray" ||
+        typeName === "Int16Array" ||
+        typeName === "Uint16Array" ||
+        typeName === "Int32Array" ||
+        typeName === "Uint32Array" ||
+        typeName === "BigInt64Array" ||
+        typeName === "BigUint64Array")) {
+      throw DOMException.create(this._globalObject, [
+        `getRandomValues() only accepts integer typed arrays`,
+        "TypeMismatchError"
+      ]);
+    }
+
+    if (array.byteLength > 65536) {
+      throw DOMException.create(this._globalObject, [
+        `getRandomValues() cannot generate more than 65536 bytes of random values; ` +
+        `${array.byteLength} bytes were requested`,
+        "QuotaExceededError"
+      ]);
+    }
+
+    nodeCrypto.randomFillSync(array);
+    return array;
+  }
+}
+
+exports.implementation = CryptoImpl;
diff --git a/lib/jsdom/living/crypto/Crypto.webidl b/lib/jsdom/living/crypto/Crypto.webidl
@@ -0,0 +1,4 @@
+[Exposed=(Window,Worker)]
+interface Crypto {
+  ArrayBufferView getRandomValues(ArrayBufferView array);
+};
diff --git a/lib/jsdom/living/interfaces.js b/lib/jsdom/living/interfaces.js
@@ -146,6 +146,8 @@ const generatedInterfaces = {
   Performance: require("./generated/Performance"),
   Navigator: require("./generated/Navigator"),
 
+  Crypto: require("./generated/Crypto"),
+
   PluginArray: require("./generated/PluginArray"),
   MimeTypeArray: require("./generated/MimeTypeArray"),
   Plugin: require("./generated/Plugin"),
diff --git a/scripts/webidl/convert.js b/scripts/webidl/convert.js
@@ -146,6 +146,7 @@ function addDir(dir) {
 addDir("../../lib/jsdom/living/aborting");
 addDir("../../lib/jsdom/living/attributes");
 addDir("../../lib/jsdom/living/constraint-validation");
+addDir("../../lib/jsdom/living/crypto");
 addDir("../../lib/jsdom/living/cssom");
 addDir("../../lib/jsdom/living/custom-elements");
 addDir("../../lib/jsdom/living/domparsing");
diff --git a/test/web-platform-tests/to-run.yaml b/test/web-platform-tests/to-run.yaml
@@ -29,6 +29,14 @@ url/**: [timeout, blob URLs not implemented]
 
 ---
 
+DIR: WebCryptoAPI
+
+"*/**": [fail, Not implemented]
+idlharness.https.any.html: [fail, Unknown]
+randomUUID.https.any.html: [fail, Not implemented]
+
+---
+
 DIR: cors
 
 304.htm: [fail-slow, Unknown]
