Move RSA properties to its own class and make it conditional (#342)

Avoids ClassNotFoundException when RSA is not on the classpath. 

Fixes gh-334.

spring-cloud-context/src/test/java/org/springframework/cloud/bootstrap/encrypt/EncryptionBootstrapConfigurationTests.java

@@ -1,12 +1,30 @@
 package org.springframework.cloud.bootstrap.encrypt;
 
+/*
+ * Copyright 2013-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 import org.junit.Test;
 import org.springframework.boot.builder.SpringApplicationBuilder;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.security.crypto.encrypt.TextEncryptor;
+import org.springframework.security.rsa.crypto.RsaAlgorithm;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
 
 public class EncryptionBootstrapConfigurationTests {
 
@@ -36,6 +54,25 @@ public class EncryptionBootstrapConfigurationTests {
 		context.close();
 	}
 
+
+	@Test
+	public void rsaProperties() {
+		ConfigurableApplicationContext context = new SpringApplicationBuilder(
+				EncryptionBootstrapConfiguration.class).web(false).properties(
+				"encrypt.key-store.location:classpath:/server.jks",
+				"encrypt.key-store.password:letmein",
+				"encrypt.key-store.alias:mytestkey", "encrypt.key-store.secret:changeme",
+				"encrypt.rsa.strong:true",
+				"encrypt.rsa.salt:foobar")
+				.run();
+		RsaProperties properties = context.getBean(RsaProperties.class);
+		assertEquals("foobar", properties.getSalt());
+		assertTrue(properties.isStrong());
+		assertEquals(RsaAlgorithm.DEFAULT, properties.getAlgorithm());
+		context.close();
+	}
+
+
 	@Test
 	public void nonExistentKeystoreLocationShouldNotBeAllowed() {
 		try {

spring-cloud-context/src/test/java/org/springframework/cloud/bootstrap/encrypt/RsaDisabledTests.java

@@ -0,0 +1,61 @@
+package org.springframework.cloud.bootstrap.encrypt;
+/*
+ * Copyright 2013-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.util.Map;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.cloud.ClassPathExclusions;
+import org.springframework.cloud.FilteredClassPathRunner;
+import org.springframework.context.ConfigurableApplicationContext;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.hasSize;
+
+/**
+ * @author Ryan Baxter
+ */
+@RunWith(FilteredClassPathRunner.class)
+@ClassPathExclusions({"spring-security-rsa*.jar"})
+public class RsaDisabledTests {
+
+	private ConfigurableApplicationContext context;
+
+	@Before
+	public void setUp() {
+		context = new SpringApplicationBuilder().web(false)
+				.sources(EncryptionBootstrapConfiguration.class).web(false).properties(
+						"encrypt.key:mykey",
+						"encrypt.rsa.strong:true",
+						"encrypt.rsa.salt:foobar").run();
+	}
+
+	@After
+	public void tearDown() {
+		if(context != null) {
+			context.close();
+		}
+	}
+
+	@Test
+	public void testLoadBalancedRetryFactoryBean() throws Exception {
+		Map<String, RsaProperties> properties =  context.getBeansOfType(RsaProperties.class);
+		assertThat(properties.values(), hasSize(0));
+	}
+}