Add support for keystore in server

E.g.

encrypt.keystore.location: file:///var/keys/keystore.jks
encrypt.keystore.password: ${KEYSTORE_PASSWORD}
encrypt.keystore.alias: myKey

Fixes gh-3

spring-platform-config-server/src/main/java/org/springframework/platform/config/server/Application.java

@@ -1,4 +1,3 @@
-
 package org.springframework.platform.config.server;
 
 import javax.annotation.PostConstruct;
@@ -12,6 +11,9 @@ import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Profile;
 import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.io.Resource;
+import org.springframework.security.rsa.crypto.KeyStoreKeyFactory;
+import org.springframework.security.rsa.crypto.RsaSecretEncryptor;
 
 @Configuration
 @ComponentScan
@@ -27,9 +29,11 @@ public class Application {
 	protected static class KeyConfiguration {
 		@Autowired
 		private EncryptionController controller;
-		
+
 		private String key;
-		
+
+		private KeyStore keyStore = new KeyStore();
+
 		public String getKey() {
 			return key;
 		}
@@ -38,12 +42,57 @@ public class Application {
 			this.key = key;
 		}
 
+		public KeyStore getKeyStore() {
+			return keyStore;
+		}
+
+		public void setKeyStore(KeyStore keyStore) {
+			this.keyStore = keyStore;
+		}
+
 		@PostConstruct
 		public void init() {
-			if (key!=null) {
+			if (keyStore.getLocation() != null) {
+				controller.setEncryptor(new RsaSecretEncryptor(new KeyStoreKeyFactory(
+						keyStore.getLocation(), keyStore.getPassword().toCharArray())
+						.getKeyPair(keyStore.getAlias())));
+			}
+			if (key != null) {
 				controller.uploadKey(key);
 			}
 		}
+
+		public static class KeyStore {
+
+			private Resource location;
+			private String password;
+			private String alias;
+
+			public String getAlias() {
+				return alias;
+			}
+
+			public void setAlias(String alias) {
+				this.alias = alias;
+			}
+
+			public Resource getLocation() {
+				return location;
+			}
+
+			public void setLocation(Resource location) {
+				this.location = location;
+			}
+
+			public String getPassword() {
+				return password;
+			}
+
+			public void setPassword(String password) {
+				this.password = password;
+			}
+
+		}
 	}
 
 	@Configuration
@@ -51,7 +100,7 @@ public class Application {
 	protected static class NativeRepositoryConfiguration {
 		@Autowired
 		private ConfigurableEnvironment environment;
-		
+
 		@Bean
 		public NativeEnvironmentRepository repository() {
 			return new NativeEnvironmentRepository(environment);

spring-platform-config-server/src/main/java/org/springframework/platform/config/server/EncryptionController.java

@@ -22,6 +22,7 @@ import java.util.Map;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.platform.config.Environment;
@@ -51,6 +52,7 @@ public class EncryptionController {
 
 	private TextEncryptor encryptor;
 
+	@Autowired(required=false)
 	public void setEncryptor(TextEncryptor encryptor) {
 		this.encryptor = encryptor;
 	}