From 4a4c9076048695b4a388031d61879657325d3ef6 Mon Sep 17 00:00:00 2001
From: LiviaMedeiros <livia@cirno.name>
Date: Wed, 12 Jan 2022 00:49:56 +0800
Subject: [PATCH] crypto: adjust types for getRandomValues
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prevents Web Crypto API's getRandomValues from accepting DataView

Fixes: https://github.com/nodejs/node/issues/41480
Refs: https://www.w3.org/TR/WebCryptoAPI/#Crypto-method-getRandomValues

PR-URL: https://github.com/nodejs/node/pull/41481
Reviewed-By: Derek Lewis <DerekNonGeneric@inf.is>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
---
 doc/api/webcrypto.md                   | 7 +++++--
 lib/internal/crypto/random.js          | 3 ++-
 test/parallel/test-webcrypto-random.js | 4 +++-
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/doc/api/webcrypto.md b/doc/api/webcrypto.md
index 191041d50034e1..3d7bf0f946ff05 100644
--- a/doc/api/webcrypto.md
+++ b/doc/api/webcrypto.md
@@ -357,12 +357,15 @@ Provides access to the `SubtleCrypto` API.
 added: v15.0.0
 -->
 
-* `typedArray` {Buffer|TypedArray|DataView|ArrayBuffer}
-* Returns: {Buffer|TypedArray|DataView|ArrayBuffer} Returns `typedArray`.
+* `typedArray` {Buffer|TypedArray}
+* Returns: {Buffer|TypedArray}
 
 Generates cryptographically strong random values. The given `typedArray` is
 filled with random values, and a reference to `typedArray` is returned.
 
+The given `typedArray` must be an integer-based instance of {TypedArray},
+i.e. `Float32Array` and `Float64Array` are not accepted.
+
 An error will be thrown if the given `typedArray` is larger than 65,536 bytes.
 
 ### `crypto.randomUUID()`
diff --git a/lib/internal/crypto/random.js b/lib/internal/crypto/random.js
index 8812120091f930..1423ea4295443e 100644
--- a/lib/internal/crypto/random.js
+++ b/lib/internal/crypto/random.js
@@ -50,6 +50,7 @@ const {
 const {
   isArrayBufferView,
   isAnyArrayBuffer,
+  isTypedArray,
   isFloat32Array,
   isFloat64Array,
 } = require('internal/util/types');
@@ -307,7 +308,7 @@ function onJobDone(buf, callback, error) {
 // not allowed to exceed 65536 bytes, and can only
 // be an integer-type TypedArray.
 function getRandomValues(data) {
-  if (!isArrayBufferView(data) ||
+  if (!isTypedArray(data) ||
       isFloat32Array(data) ||
       isFloat64Array(data)) {
     // Ordinarily this would be an ERR_INVALID_ARG_TYPE. However,
diff --git a/test/parallel/test-webcrypto-random.js b/test/parallel/test-webcrypto-random.js
index f2bf2c396fd20a..e17cc834b6c2bf 100644
--- a/test/parallel/test-webcrypto-random.js
+++ b/test/parallel/test-webcrypto-random.js
@@ -13,6 +13,7 @@ const { getRandomValues } = require('crypto').webcrypto;
   undefined, null, '', 1, {}, [],
   new Float32Array(1),
   new Float64Array(1),
+  new DataView(new ArrayBuffer(1)),
 ].forEach((i) => {
   assert.throws(
     () => getRandomValues(i),
@@ -32,6 +33,7 @@ const intTypedConstructors = [
   Uint8Array,
   Uint16Array,
   Uint32Array,
+  Uint8ClampedArray,
   BigInt64Array,
   BigUint64Array,
 ];
@@ -47,7 +49,7 @@ for (const ctor of intTypedConstructors) {
 {
   const buf = new Uint16Array(10);
   const before = Buffer.from(buf).toString('hex');
-  getRandomValues(new DataView(buf.buffer));
+  getRandomValues(buf);
   const after = Buffer.from(buf).toString('hex');
   assert.notStrictEqual(before, after);
 }