Adds additional test for encyptor with RSA private key (#315)

spring-cloud-context/src/main/java/org/springframework/cloud/context/encrypt/EncryptorFactory.java

@@ -37,7 +37,7 @@ public class EncryptorFactory {
 				encryptor = new RsaSecretEncryptor(data);
 			}
 			catch (IllegalArgumentException e) {
-				throw new KeyFormatException();
+				throw new KeyFormatException(e);
 			}
 
 		}

spring-cloud-context/src/main/java/org/springframework/cloud/context/encrypt/KeyFormatException.java

@@ -17,4 +17,11 @@ package org.springframework.cloud.context.encrypt;
 
 @SuppressWarnings("serial")
 public class KeyFormatException extends RuntimeException {
+	public KeyFormatException() {
+		super();
+	}
+	
+	public KeyFormatException(Throwable t) {
+		super(t);
+	}
 }

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

@@ -0,0 +1,47 @@
+/*
+ * Copyright 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.
+ */
+package org.springframework.cloud.bootstrap.encrypt;
+
+import org.junit.Test;
+import org.springframework.cloud.context.encrypt.EncryptorFactory;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.security.crypto.encrypt.TextEncryptor;
+import org.springframework.util.StreamUtils;
+
+import java.nio.charset.Charset;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * @author Biju Kunjummen
+ */
+public class EncryptorFactoryTests {
+
+	@Test
+	public void testWithRsaPrivateKey() throws Exception {
+		String key = StreamUtils.copyToString(
+				new ClassPathResource("/example-test-rsa-private-key").getInputStream(),
+				Charset.forName("ASCII"));
+		//RSA private key needs to be with no new lines 
+		//-----BEGIN RSA PRIVATE KEY-----MIIEowI....iX8htsO-----END RSA PRIVATE KEY-----
+		String keyNoNewLines = key.replaceAll("\\n", "");
+		TextEncryptor encryptor = new EncryptorFactory().create(keyNoNewLines);
+		String toEncrypt = "sample text to encrypt";
+		String encrypted = encryptor.encrypt(toEncrypt);
+
+		assertEquals(toEncrypt, encryptor.decrypt(encrypted));
+	}
+}

spring-cloud-context/src/test/resources/example-test-rsa-private-key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----