test: split test-crypto-dh to avoid timeout on slow machines in the CI

Locally this speeds up running test-crypto-dh* from 7s to 2s. This was
previously timing out in CI (took more than 2 minutes) so should see
a bigger gap in the CI.

test/parallel/test-crypto-dh-errors.js

@@ -0,0 +1,111 @@
+'use strict';
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+
+const assert = require('assert');
+const crypto = require('crypto');
+
+// https://github.com/nodejs/node/issues/32738
+// XXX(bnoordhuis) validateInt32() throwing ERR_OUT_OF_RANGE and RangeError
+// instead of ERR_INVALID_ARG_TYPE and TypeError is questionable, IMO.
+assert.throws(() => crypto.createDiffieHellman(13.37), {
+  code: 'ERR_OUT_OF_RANGE',
+  name: 'RangeError',
+  message: 'The value of "sizeOrKey" is out of range. ' +
+           'It must be an integer. Received 13.37',
+});
+
+assert.throws(() => crypto.createDiffieHellman('abcdef', 13.37), {
+  code: 'ERR_OUT_OF_RANGE',
+  name: 'RangeError',
+  message: 'The value of "generator" is out of range. ' +
+           'It must be an integer. Received 13.37',
+});
+
+for (const bits of [-1, 0, 1]) {
+  if (common.hasOpenSSL3) {
+    assert.throws(() => crypto.createDiffieHellman(bits), {
+      code: 'ERR_OSSL_DH_MODULUS_TOO_SMALL',
+      name: 'Error',
+      message: /modulus too small/,
+    });
+  } else {
+    assert.throws(() => crypto.createDiffieHellman(bits), {
+      code: 'ERR_OSSL_BN_BITS_TOO_SMALL',
+      name: 'Error',
+      message: /bits too small/,
+    });
+  }
+}
+
+for (const g of [-1, 1]) {
+  const ex = {
+    code: 'ERR_OSSL_DH_BAD_GENERATOR',
+    name: 'Error',
+    message: /bad generator/,
+  };
+  assert.throws(() => crypto.createDiffieHellman('abcdef', g), ex);
+  assert.throws(() => crypto.createDiffieHellman('abcdef', 'hex', g), ex);
+}
+
+for (const g of [Buffer.from([]),
+                 Buffer.from([0]),
+                 Buffer.from([1])]) {
+  const ex = {
+    code: 'ERR_OSSL_DH_BAD_GENERATOR',
+    name: 'Error',
+    message: /bad generator/,
+  };
+  assert.throws(() => crypto.createDiffieHellman('abcdef', g), ex);
+  assert.throws(() => crypto.createDiffieHellman('abcdef', 'hex', g), ex);
+}
+
+[
+  [0x1, 0x2],
+  () => { },
+  /abc/,
+  {},
+].forEach((input) => {
+  assert.throws(
+    () => crypto.createDiffieHellman(input),
+    {
+      code: 'ERR_INVALID_ARG_TYPE',
+      name: 'TypeError',
+    }
+  );
+});
+
+// Invalid test: curve argument is undefined
+assert.throws(
+  () => crypto.createECDH(),
+  {
+    code: 'ERR_INVALID_ARG_TYPE',
+    name: 'TypeError',
+    message: 'The "curve" argument must be of type string. ' +
+            'Received undefined'
+  });
+
+assert.throws(
+  function() {
+    crypto.getDiffieHellman('unknown-group');
+  },
+  {
+    name: 'Error',
+    code: 'ERR_CRYPTO_UNKNOWN_DH_GROUP',
+    message: 'Unknown DH group'
+  },
+  'crypto.getDiffieHellman(\'unknown-group\') ' +
+  'failed to throw the expected error.'
+);
+
+assert.throws(
+  () => crypto.createDiffieHellman('', true),
+  {
+    code: 'ERR_INVALID_ARG_TYPE'
+  }
+);
+[true, Symbol(), {}, () => {}, []].forEach((generator) => assert.throws(
+  () => crypto.createDiffieHellman('', 'base64', generator),
+  { code: 'ERR_INVALID_ARG_TYPE' }
+));

test/parallel/test-crypto-dh-generate-keys.js

@@ -0,0 +1,63 @@
+'use strict';
+
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+
+const assert = require('assert');
+const crypto = require('crypto');
+
+{
+  const size = common.hasFipsCrypto || common.hasOpenSSL3 ? 1024 : 256;
+
+  function unlessInvalidState(f) {
+    try {
+      return f();
+    } catch (err) {
+      if (err.code !== 'ERR_CRYPTO_INVALID_STATE') {
+        throw err;
+      }
+    }
+  }
+
+  function testGenerateKeysChangesKeys(setup, expected) {
+    const dh = crypto.createDiffieHellman(size);
+    setup(dh);
+    const firstPublicKey = unlessInvalidState(() => dh.getPublicKey());
+    const firstPrivateKey = unlessInvalidState(() => dh.getPrivateKey());
+    dh.generateKeys();
+    const secondPublicKey = dh.getPublicKey();
+    const secondPrivateKey = dh.getPrivateKey();
+    function changed(shouldChange, first, second) {
+      if (shouldChange) {
+        assert.notDeepStrictEqual(first, second);
+      } else {
+        assert.deepStrictEqual(first, second);
+      }
+    }
+    changed(expected.includes('public'), firstPublicKey, secondPublicKey);
+    changed(expected.includes('private'), firstPrivateKey, secondPrivateKey);
+  }
+
+  // Both the private and the public key are missing: generateKeys() generates both.
+  testGenerateKeysChangesKeys(() => {
+    // No setup.
+  }, ['public', 'private']);
+
+  // Neither key is missing: generateKeys() does nothing.
+  testGenerateKeysChangesKeys((dh) => {
+    dh.generateKeys();
+  }, []);
+
+  // Only the public key is missing: generateKeys() generates only the public key.
+  testGenerateKeysChangesKeys((dh) => {
+    dh.setPrivateKey(Buffer.from('01020304', 'hex'));
+  }, ['public']);
+
+  // The public key is outdated: generateKeys() generates only the public key.
+  testGenerateKeysChangesKeys((dh) => {
+    const oldPublicKey = dh.generateKeys();
+    dh.setPrivateKey(Buffer.from('01020304', 'hex'));
+    assert.deepStrictEqual(dh.getPublicKey(), oldPublicKey);
+  }, ['public']);
+}