Add RemoveDefaultProvidersTest

tst/com/amazon/corretto/crypto/provider/test/RemoveDefaultProvidersTest.java

@@ -0,0 +1,64 @@
+// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+package com.amazon.corretto.crypto.provider.test;
+
+import static com.amazon.corretto.crypto.provider.test.TestUtil.NATIVE_PROVIDER;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.Provider;
+import java.security.Security;
+import java.security.Signature;
+import java.util.ArrayList;
+import java.util.List;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.jupiter.api.parallel.Execution;
+import org.junit.jupiter.api.parallel.ExecutionMode;
+import org.junit.jupiter.api.parallel.ResourceAccessMode;
+import org.junit.jupiter.api.parallel.ResourceLock;
+
+@Execution(ExecutionMode.CONCURRENT)
+@ExtendWith(TestResultLogger.class)
+@ResourceLock(value = TestUtil.RESOURCE_GLOBAL, mode = ResourceAccessMode.READ_WRITE)
+// This test is used to prove that functionality tested within it is independent of
+// default-registered JDK providers (SunEC, SunJCE, etc.). We take a global resource
+// lock because other tests rely on default providers and JCA state is global.
+public class RemoveDefaultProvidersTest {
+  private static List<Provider> defaultProviders;
+
+  @BeforeAll
+  static void removeAndStoreProviders() {
+    defaultProviders = new ArrayList<>();
+    for (Provider provider : Security.getProviders()) {
+      defaultProviders.add(provider);
+      Security.removeProvider(provider.getName());
+    }
+    assertTrue(Security.getProviders().length == 0);
+  }
+
+  @AfterAll
+  static void restoreProviders() {
+    assertTrue(Security.getProviders().length == 0);
+    for (Provider provider : defaultProviders) {
+      Security.addProvider(provider);
+    }
+  }
+
+  @Test
+  void testEdDSASignature() throws Exception {
+    final byte[] message = new byte[0];
+    final KeyPair keyPair =
+        KeyPairGenerator.getInstance("EdDSA", NATIVE_PROVIDER).generateKeyPair();
+    final Signature signature = Signature.getInstance("EdDSA", NATIVE_PROVIDER);
+    signature.initSign(keyPair.getPrivate());
+    signature.update(message);
+    final byte[] signatureBytes = signature.sign();
+    signature.initVerify(keyPair.getPublic());
+    signature.update(message);
+    assertTrue(signature.verify(signatureBytes));
+  }
+}