util: add util.types.isKeyObject and util.types.isCryptoKey

doc/api/util.md

@@ -1485,6 +1485,16 @@ util.types.isBoxedPrimitive(Object(Symbol('foo'))); // Returns true
 util.types.isBoxedPrimitive(Object(BigInt(5))); // Returns true
 ```
 
+### `util.types.isCryptoKey(value)`
+<!-- YAML
+added: REPLACEME
+-->
+
+* `value` {Object}
+* Returns: {boolean}
+
+Returns `true` if `value` is a {CryptoKey}, `false` otherwise.
+
 ### `util.types.isDataView(value)`
 <!-- YAML
 added: v10.0.0
@@ -1680,6 +1690,16 @@ util.types.isInt32Array(new Int32Array());  // Returns true
 util.types.isInt32Array(new Float64Array());  // Returns false
 ```
 
+### `util.types.isKeyObject(value)`
+<!-- YAML
+added: REPLACEME
+-->
+
+* `value` {Object}
+* Returns: {boolean}
+
+Returns `true` if `value` is a {KeyObject}, `false` otherwise.
+
 ### `util.types.isMap(value)`
 <!-- YAML
 added: v10.0.0

lib/internal/crypto/keys.js

@@ -639,8 +639,8 @@ function createPrivateKey(key) {
   return new PrivateKeyObject(handle);
 }
 
-function isKeyObject(key) {
-  return key instanceof KeyObject;
+function isKeyObject(obj) {
+  return obj != null && obj[kKeyType] !== undefined;
 }
 
 // Our implementation of CryptoKey is a simple wrapper around a KeyObject

lib/internal/util/types.js

@@ -2,6 +2,7 @@
 
 const {
   ArrayBufferIsView,
+  ObjectDefineProperties,
   TypedArrayPrototypeGetSymbolToStringTag,
 } = primordials;
 
@@ -69,3 +70,39 @@ module.exports = {
   isBigInt64Array,
   isBigUint64Array
 };
+
+let isCryptoKey;
+let isKeyObject;
+
+ObjectDefineProperties(module.exports, {
+  isKeyObject: {
+    configurable: false,
+    enumerable: true,
+    value(obj) {
+      if (!process.versions.openssl) {
+        return false;
+      }
+
+      if (!isKeyObject) {
+        ({ isKeyObject } = require('internal/crypto/keys'));
+      }
+
+      return isKeyObject(obj);
+    }
+  },
+  isCryptoKey: {
+    configurable: false,
+    enumerable: true,
+    value(obj) {
+      if (!process.versions.openssl) {
+        return false;
+      }
+
+      if (!isCryptoKey) {
+        ({ isCryptoKey } = require('internal/crypto/keys'));
+      }
+
+      return isCryptoKey(obj);
+    }
+  }
+});

test/parallel/test-crypto-key-objects.js

@@ -8,6 +8,7 @@ if (common.hasOpenSSL3)
   common.skip('temporarily skipping for OpenSSL 3.0-alpha15');
 
 const assert = require('assert');
+const { types: { isKeyObject } } = require('util');
 const {
   createCipheriv,
   createDecipheriv,
@@ -23,7 +24,8 @@ const {
   privateDecrypt,
   privateEncrypt,
   getCurves,
-  generateKeyPairSync
+  generateKeyPairSync,
+  webcrypto,
 } = require('crypto');
 
 const fixtures = require('../common/fixtures');
@@ -774,3 +776,24 @@ const privateDsa = fixtures.readKey('dsa_private_encrypted_1025.pem',
       message: `Unsupported JWK EC curve: ${namedCurve}.`
     });
 }
+
+{
+  const buffer = Buffer.from('Hello World');
+  const keyObject = createSecretKey(buffer);
+  const keyPair = generateKeyPairSync('ec', { namedCurve: 'P-256' });
+  assert(isKeyObject(keyPair.publicKey));
+  assert(isKeyObject(keyPair.privateKey));
+  assert(isKeyObject(keyObject));
+
+  assert(!isKeyObject(buffer));
+
+  webcrypto.subtle.importKey(
+    'node.keyObject',
+    keyPair.publicKey,
+    { name: 'ECDH', namedCurve: 'P-256' },
+    false,
+    [],
+  ).then((cryptoKey) => {
+    assert(!isKeyObject(cryptoKey));
+  });
+}

test/parallel/test-util-types.js

@@ -281,3 +281,13 @@ for (const [ value, _method ] of [
   await m.evaluate();
   assert.ok(types.isModuleNamespaceObject(m.namespace));
 })().then(common.mustCall());
+
+{
+  // eslint-disable-next-line node-core/crypto-check
+  if (common.hasCrypto) {
+    const crypto = require('crypto');
+    assert.ok(!types.isKeyObject(crypto.createHash('sha1')));
+  }
+  assert.ok(!types.isCryptoKey());
+  assert.ok(!types.isKeyObject());
+}

test/parallel/test-webcrypto-keygen.js

@@ -6,7 +6,11 @@ if (!common.hasCrypto)
   common.skip('missing crypto');
 
 const assert = require('assert');
-const { subtle, CryptoKey } = require('crypto').webcrypto;
+const { types: { isCryptoKey } } = require('util');
+const {
+  webcrypto: { subtle, CryptoKey },
+  createSecretKey,
+} = require('crypto');
 
 const allUsages = [
   'encrypt',
@@ -220,6 +224,8 @@ const vectors = {
 
     assert(publicKey);
     assert(privateKey);
+    assert(isCryptoKey(publicKey));
+    assert(isCryptoKey(privateKey));
 
     assert(publicKey instanceof CryptoKey);
     assert(privateKey instanceof CryptoKey);
@@ -366,6 +372,8 @@ const vectors = {
 
     assert(publicKey);
     assert(privateKey);
+    assert(isCryptoKey(publicKey));
+    assert(isCryptoKey(privateKey));
 
     assert.strictEqual(publicKey.type, 'public');
     assert.strictEqual(privateKey.type, 'private');
@@ -430,6 +438,7 @@ const vectors = {
     }, true, usages);
 
     assert(key);
+    assert(isCryptoKey(key));
 
     assert.strictEqual(key.type, 'secret');
     assert.strictEqual(key.extractable, true);
@@ -488,6 +497,7 @@ const vectors = {
     }
 
     assert(key);
+    assert(isCryptoKey(key));
 
     assert.strictEqual(key.type, 'secret');
     assert.strictEqual(key.extractable, true);
@@ -544,6 +554,8 @@ const vectors = {
 
     assert(publicKey);
     assert(privateKey);
+    assert(isCryptoKey(publicKey));
+    assert(isCryptoKey(privateKey));
 
     assert.strictEqual(publicKey.type, 'public');
     assert.strictEqual(privateKey.type, 'private');
@@ -634,6 +646,8 @@ const vectors = {
     }, true, ['deriveKey']);
   assert(publicKey);
   assert(privateKey);
+  assert(isCryptoKey(publicKey));
+  assert(isCryptoKey(privateKey));
   assert.strictEqual(publicKey.type, 'public');
   assert.strictEqual(privateKey.type, 'private');
   assert.strictEqual(publicKey.algorithm.name, 'NODE-DH');
@@ -646,3 +660,10 @@ const vectors = {
 assert.throws(() => new CryptoKey(), {
   code: 'ERR_OPERATION_FAILED'
 });
+
+{
+  const buffer = Buffer.from('Hello World');
+  const keyObject = createSecretKey(buffer);
+  assert(!isCryptoKey(buffer));
+  assert(!isCryptoKey(keyObject));
+}