test: add test about unencrypted PKCS#8 private key for DSA

test/fixtures/test_dsa_pkcs8_privkey.pem

@@ -0,0 +1,15 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----

test/parallel/test-crypto-rsa-dsa.js

@@ -22,6 +22,7 @@ const dsaKeyPem = fixtures.readSync('test_dsa_privkey.pem', 'ascii');
 const dsaKeyPemEncrypted = fixtures.readSync('test_dsa_privkey_encrypted.pem',
                                              'ascii');
 const rsaPkcs8KeyPem = fixtures.readSync('test_rsa_pkcs8_privkey.pem');
+const dsaPkcs8KeyPem = fixtures.readSync('test_dsa_pkcs8_privkey.pem');
 
 const decryptError =
   /^Error: error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt$/;
@@ -258,6 +259,35 @@ assert.throws(() => {
 }
 
 
+//
+// Test DSA signing and verification with PKCS#8 private key
+//
+{
+  const input = 'I AM THE WALRUS';
+
+  // DSA signatures vary across runs so there is no static string to verify
+  // against
+  const sign = crypto.createSign('SHA1');
+  sign.update(input);
+  const signature = sign.sign(dsaPkcs8KeyPem, 'hex');
+
+  const verify = crypto.createVerify('SHA1');
+  verify.update(input);
+
+  assert.strictEqual(verify.verify(dsaPubPem, signature, 'hex'), true);
+
+  // Test the legacy 'DSS1' name.
+  const sign2 = crypto.createSign('DSS1');
+  sign2.update(input);
+  const signature2 = sign2.sign(dsaPkcs8KeyPem, 'hex');
+
+  const verify2 = crypto.createVerify('DSS1');
+  verify2.update(input);
+
+  assert.strictEqual(verify2.verify(dsaPubPem, signature2, 'hex'), true);
+}
+
+
 //
 // Test DSA signing and verification with encrypted key
 //