add SL20 connecter-backend in a first beta version (getCertificate looks good, create signature is untested)

13 files changed, 1427 insertions, 69 deletions

diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/config/WebConfiguration.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/config/WebConfiguration.java
index d63f698f..c6b27eb3 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/config/WebConfiguration.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/config/WebConfiguration.java
@@ -42,9 +42,12 @@ public class WebConfiguration implements IConfigurationConstants {
 	public static final String LOCAL_BKU_ENABLED = "bku.sign.enabled";
 	public static final String ONLINE_BKU_ENABLED = "moc.sign.enabled";
 	public static final String MOBILE_BKU_ENABLED = "mobile.sign.enabled";
+	public static final String SL20_BKU_ENABLED = "sl20.sign.enabled";
 	public static final String LOCAL_BKU_URL = "bku.local.url";
 	public static final String ONLINE_BKU_URL = "bku.online.url";
 	public static final String MOBILE_BKU_URL = "bku.mobile.url";
+	public static final String SL20_BKU_URL = "sl20.mobile.url";
+	
 	public static final String ERROR_DETAILS = "error.showdetails";
 	public static final String PDF_AS_WORK_DIR = "pdfas.dir";
 	public static final String STATISTIC_BACKEND_LIST = "statistic.backends";
@@ -82,6 +85,23 @@ public class WebConfiguration implements IConfigurationConstants {
 	public static final String KEYSTORE_DEFAULT_ALIAS = KEYSTORE_DEFAULT + "." + KEYSTORE_ALIAS;
 	public static final String KEYSTORE_DEFAULT_KEY_PASS = KEYSTORE_DEFAULT + "." + KEYSTORE_KEY_PASS;
 
+	//SL20 stuff
+	public static final String SL20_PREFIX = "sl20";
+	public static final String SL20_KEYSTORE_PREFIX = SL20_PREFIX + ".keystore"; 
+	public static final String SL20_KEYSTORE_FILE = SL20_KEYSTORE_PREFIX + "." + "file";
+	public static final String SL20_KEYSTORE_TYPE = SL20_KEYSTORE_PREFIX + "." + "type";
+	public static final String SL20_KEYSTORE_PASS = SL20_KEYSTORE_PREFIX + "." + "pass";
+	public static final String SL20_KEYSTORE_KEY_SIGN_ALIAS = SL20_KEYSTORE_PREFIX + "." + "sign.key.alias";
+	public static final String SL20_KEYSTORE_KEY_SIGN_PASS = SL20_KEYSTORE_PREFIX + "." + "sign.key.pass";
+	public static final String SL20_KEYSTORE_KEY_ENCRYPTION_ALIAS = SL20_KEYSTORE_PREFIX + "." + "enc.key.alias";
+	public static final String SL20_KEYSTORE_KEY_ENCRYPTION_PASS = SL20_KEYSTORE_PREFIX + "." + "enc.key.pass";
+	public static final String SL20_DEBUG_VALIDATION_DISABLED = SL20_PREFIX + ".debug.validation.disable";
+	public static final String SL20_DEBUG_SIGNING_ENABLED = SL20_PREFIX + ".debug.signed.result.enabled";
+	public static final String SL20_DEBUG_SIGNING_REQUIRED = SL20_PREFIX + ".debug.signed.result.required";
+	public static final String SL20_DEBUG_ENCRYPTION_ENABLED = SL20_PREFIX + ".debug.encryption.enabled";
+	public static final String SL20_DEBUG_ENCRYPTION_REQUIRED = SL20_PREFIX + ".debug.encryption.required";
+	
+	
 	public static final String WHITELIST_ENABLED = "whitelist.enabled";
 	public static final String WHITELIST_VALUE_PRE = "whitelist.url.";
 
@@ -248,6 +268,20 @@ public class WebConfiguration implements IConfigurationConstants {
 		return null;
 	}
 
+	public static String getSecurityLayer20URL() {
+		if(getSL20Enabled()) {
+			String overwrite = properties.getProperty(SL20_SIGN_URL);
+			if(overwrite == null) {
+				overwrite = properties.getProperty(SL20_BKU_URL);
+				if(overwrite == null) {
+					overwrite = PdfAsHelper.getPdfAsConfig().getValue(SL20_SIGN_URL);
+				}
+			}
+			return overwrite;
+		}
+		return null;
+	}
+	
 	public static String getPdfASDir() {
 		return properties.getProperty(PDF_AS_WORK_DIR);
 	}
@@ -447,6 +481,16 @@ public class WebConfiguration implements IConfigurationConstants {
 		return false;
 	}
 
+	public static boolean getSL20Enabled() {
+		String value = properties.getProperty(SL20_BKU_ENABLED);
+		if (value != null) {
+			if (value.equals("true")) {
+				return true;
+			}
+		}
+		return false;
+	}
+	
 	public static boolean getSoapSignEnabled() {
 		String value = properties.getProperty(SOAP_SIGN_ENABLED);
 		if (value != null) {
@@ -598,5 +642,66 @@ public class WebConfiguration implements IConfigurationConstants {
 		}
 		return false;
 	}
+	
+	public static String getSL20KeyStorePath() {
+		return properties.getProperty(SL20_KEYSTORE_FILE);
+		
+	}
+	
+	public static String getSL20KeyStoreType() {
+		return properties.getProperty(SL20_KEYSTORE_TYPE);
+		
+	}
+	
+	public static String getSL20KeyStorePassword() {
+		return properties.getProperty(SL20_KEYSTORE_PASS);
+		
+	}
+	
+	public static String getSL20KeySigningAlias() {
+		return properties.getProperty(SL20_KEYSTORE_KEY_SIGN_ALIAS);
+		
+	}
+	
+	public static String getSL20KeySigningPassword() {
+		return properties.getProperty(SL20_KEYSTORE_KEY_SIGN_PASS);
+		
+	}
+	
+	public static String getSL20KeyEncryptionAlias() {
+		return properties.getProperty(SL20_KEYSTORE_KEY_ENCRYPTION_ALIAS);
+		
+	}
+	
+	public static String getSL20KeyEncryptionPassword() {
+		return properties.getProperty(SL20_KEYSTORE_KEY_ENCRYPTION_PASS);
+		
+	}
+	
+	public static boolean isSL20ValidationDisabled( ) {
+		return Boolean.parseBoolean(properties.getProperty(SL20_DEBUG_VALIDATION_DISABLED, String.valueOf(false)));
+		
+	}
+	
+	public static boolean isSL20SigningEnabled( ) {
+		return Boolean.parseBoolean(properties.getProperty(SL20_DEBUG_SIGNING_ENABLED, String.valueOf(false)));
+		
+	}
+	
+	public static boolean isSL20SigningRequired( ) {
+		return Boolean.parseBoolean(properties.getProperty(SL20_DEBUG_SIGNING_REQUIRED, String.valueOf(false)));
+		
+	}
+	
+	public static boolean isSL20EncryptionEnabled( ) {
+		return Boolean.parseBoolean(properties.getProperty(SL20_DEBUG_ENCRYPTION_ENABLED, String.valueOf(false)));
+		
+	}
+	
+	public static boolean isSL20EncryptionRequired( ) {
+		return Boolean.parseBoolean(properties.getProperty(SL20_DEBUG_ENCRYPTION_REQUIRED, String.valueOf(false)));
+		
+	}
+	
 
 }
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/helper/PdfAsHelper.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/helper/PdfAsHelper.java
index 3aad831d..4b776cb3 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/helper/PdfAsHelper.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/helper/PdfAsHelper.java
@@ -30,12 +30,17 @@ import java.awt.image.RenderedImage;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.IOException;
+import java.io.StringWriter;
 import java.io.UnsupportedEncodingException;
+import java.net.URL;
 import java.net.URLEncoder;
 import java.security.cert.CertificateException;
+import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.UUID;
 
 import javax.imageio.ImageIO;
 import javax.servlet.RequestDispatcher;
@@ -51,9 +56,12 @@ import org.apache.commons.codec.binary.Base64;
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.StringEscapeUtils;
+import org.apache.http.entity.ContentType;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import com.google.gson.JsonObject;
+
 import at.gv.egiz.pdfas.api.ws.PDFASSignParameters;
 import at.gv.egiz.pdfas.api.ws.PDFASSignParameters.Connector;
 import at.gv.egiz.pdfas.api.ws.PDFASSignResponse;
@@ -77,6 +85,8 @@ import at.gv.egiz.pdfas.sigs.pades.PAdESSignerKeystore;
 import at.gv.egiz.pdfas.web.config.WebConfiguration;
 import at.gv.egiz.pdfas.web.exception.PdfAsWebException;
 import at.gv.egiz.pdfas.web.servlets.UIEntryPointServlet;
+import at.gv.egiz.pdfas.web.sl20.JsonSecurityUtils;
+import at.gv.egiz.pdfas.web.sl20.SL20HttpBindingUtils;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent;
 import at.gv.egiz.sl.schema.CreateCMSSignatureResponseType;
 import at.gv.egiz.sl.schema.InfoboxAssocArrayPairType;
@@ -84,8 +94,16 @@ import at.gv.egiz.sl.schema.InfoboxReadRequestType;
 import at.gv.egiz.sl.schema.InfoboxReadResponseType;
 import at.gv.egiz.sl.schema.ObjectFactory;
 import at.gv.egiz.sl.util.BKUSLConnector;
+import at.gv.egiz.sl.util.BaseSLConnector;
 import at.gv.egiz.sl.util.RequestPackage;
 import at.gv.egiz.sl.util.SLMarschaller;
+import at.gv.egiz.sl20.SL20Connector;
+import at.gv.egiz.sl20.data.VerificationResult;
+import at.gv.egiz.sl20.exceptions.SL20Exception;
+import at.gv.egiz.sl20.exceptions.SLCommandoParserException;
+import at.gv.egiz.sl20.utils.SL20Constants;
+import at.gv.egiz.sl20.utils.SL20JSONBuilderUtils;
+import at.gv.egiz.sl20.utils.SL20JSONExtractorUtils;
 
 public class PdfAsHelper {
 
@@ -105,6 +123,7 @@ public class PdfAsHelper {
 	private static final String PDF_PROVIDE_PAGE = "/ProvidePDF";
 	private static final String PDF_PDFDATA_PAGE = "/PDFData";
 	private static final String PDF_DATAURL_PAGE = "/DataURL";
+	private static final String PDF_SL20_DATAURL_PAGE = "/DataURLSL20";
 	private static final String PDF_USERENTRY_PAGE = "/userentry";
 	private static final String PDF_ERR_URL = "PDF_ERR_URL";
 	private static final String PDF_FILE_NAME = "PDF_FILE_NAME";
@@ -118,6 +137,7 @@ public class PdfAsHelper {
 	private static final String SIGNATURE_ACTIVE = "SIGNATURE_ACTIVE";
 	private static final String VERIFICATION_RESULT = "VERIFICATION_RESULT";
 	private static final String QRCODE_CONTENT = "QR_CONT";
+	public static final String PDF_SESSION_PREFIX = "PDF_SESSION_";
 
 	private static final Logger logger = LoggerFactory
 			.getLogger(PdfAsHelper.class);
@@ -707,6 +727,12 @@ public class PdfAsHelper {
 			// conn.setBase64(true);
 			signer = new PAdESSigner(conn);
 			session.setAttribute(PDF_SL_CONNECTOR, conn);
+			
+		} else if (connector.equals("sl20")) {
+			SL20Connector conn = new SL20Connector(config);
+			signer = new PAdESSigner(conn);
+			session.setAttribute(PDF_SL_CONNECTOR, conn);
+			
 		} else {
 			throw new PdfAsWebException(
 					"Invalid connector (bku | onlinebku | mobilebku | moa | jks)");
@@ -794,9 +820,15 @@ public class PdfAsHelper {
 			// conn.setBase64(true);
 			signer = new PAdESSigner(conn);
 			session.setAttribute(PDF_SL_CONNECTOR, conn);
+
+		} else if (connector.equals("sl20")) {
+			SL20Connector conn = new SL20Connector(config);
+			signer = new PAdESSigner(conn);
+			session.setAttribute(PDF_SL_CONNECTOR, conn);
+			
 		} else {
 			throw new PdfAsWebException(
-					"Invalid connector (bku | onlinebku | mobilebku | moa | jks)");
+					"Invalid connector (bku | onlinebku | mobilebku | moa | jks | sl20)");
 		}
 		signParameter.setPreprocessorArguments(preProcessor);
 		signParameter.setPlainSigner(signer);
@@ -839,7 +871,7 @@ public class PdfAsHelper {
 		PdfAsHelper.process(request, response, context);
 	}
 
-	private static byte[] getCertificate(
+	public static byte[] getCertificate(
 			InfoboxReadResponseType infoboxReadResponseType) {
 		byte[] data = null;
 		if (infoboxReadResponseType.getAssocArrayData() != null) {
@@ -898,7 +930,7 @@ public class PdfAsHelper {
 	
 	public static void injectCertificate(HttpServletRequest request,
 			HttpServletResponse response,
-			InfoboxReadResponseType infoboxReadResponseType,
+			byte[] certificate,
 			ServletContext context) throws Exception {
 
 		HttpSession session = request.getSession();
@@ -910,7 +942,7 @@ public class PdfAsHelper {
 					+ session.getId());
 		}
 
-		statusRequest.setCertificate(getCertificate(infoboxReadResponseType));
+		statusRequest.setCertificate(certificate);
 		statusRequest = pdfAs.process(statusRequest);
 		session.setAttribute(PDF_STATUS, statusRequest);
 
@@ -919,7 +951,7 @@ public class PdfAsHelper {
 
 	public static void injectSignature(HttpServletRequest request,
 			HttpServletResponse response,
-			CreateCMSSignatureResponseType createCMSSignatureResponseType,
+			byte[] cmsSginature,
 			ServletContext context) throws Exception {
 
 		logger.debug("Got CMS Signature Response");
@@ -933,8 +965,7 @@ public class PdfAsHelper {
 					+ session.getId());
 		}
 
-		statusRequest.setSigature(createCMSSignatureResponseType
-				.getCMSSignature());
+		statusRequest.setSigature(cmsSginature);
 		statusRequest = pdfAs.process(statusRequest);
 		session.setAttribute(PDF_STATUS, statusRequest);
 
@@ -996,21 +1027,35 @@ public class PdfAsHelper {
 
 		String connector = (String) session.getAttribute(PDF_SL_INTERACTIVE);
 
+		//load connector
+		BaseSLConnector slConnector = null;
 		if (connector.equals("bku") || connector.equals("onlinebku")
-				|| connector.equals("mobilebku")) {
-			BKUSLConnector bkuSLConnector = (BKUSLConnector) session
+				|| connector.equals("mobilebku"))
+			slConnector = (BKUSLConnector) session
 					.getAttribute(PDF_SL_CONNECTOR);
-
-			if (statusRequest.needCertificate()) {
-				logger.debug("Needing Certificate from BKU");
-				// build SL Request to read certificate
-				InfoboxReadRequestType readCertificateRequest = bkuSLConnector
-						.createInfoboxReadRequest(statusRequest
-								.getSignParameter());
-
+		
+		else if (connector.equals("sl20"))
+			slConnector = (SL20Connector) session
+					.getAttribute(PDF_SL_CONNECTOR);
+		
+		else
+			throw new PdfAsWebException("Invalid connector: " + connector);
+		
+		JsonSecurityUtils joseTools = JsonSecurityUtils.getInstance();
+		if (!joseTools.isInitialized())
+			joseTools = null;
+		
+		if (statusRequest.needCertificate()) {
+			logger.debug("Needing Certificate from BKU");
+			// build SL Request to read certificate
+			InfoboxReadRequestType readCertificateRequest = slConnector
+					.createInfoboxReadRequest(statusRequest
+							.getSignParameter());
+
+			if (slConnector instanceof BKUSLConnector) {
 				JAXBElement<InfoboxReadRequestType> readRequest = of
 						.createInfoboxReadRequest(readCertificateRequest);
-
+	
 				String url = generateDataURL(request, response);
 				String slRequest = SLMarschaller.marshalToString(readRequest);
 				String template = getTemplateSL();
@@ -1021,7 +1066,7 @@ public class PdfAsHelper {
 						StringEscapeUtils.escapeHtml4(slRequest));
 				template = template.replace("##DataURL##", url);
 				template = template.replace("##LOCALE##", locale);
-
+	
 				if (statusRequest.getSignParameter().getTransactionId() != null) {
 					template = template.replace(
 							"##ADDITIONAL##",
@@ -1034,70 +1079,220 @@ public class PdfAsHelper {
 				} else {
 					template = template.replace("##ADDITIONAL##", "");
 				}
-
+	
 				response.getWriter().write(template);
 				// TODO: set content type of response!!
 				response.setContentType("text/html");
 				response.getWriter().close();
-			} else if (statusRequest.needSignature()) {
-				logger.debug("Needing Signature from BKU");
-				// build SL Request for cms signature
-				RequestPackage pack = bkuSLConnector.createCMSRequest(
-						statusRequest.getSignatureData(),
-						statusRequest.getSignatureDataByteRange(),
-						statusRequest.getSignParameter());
-
+				
+			} else if (slConnector instanceof SL20Connector) {
+				//generate request for getCertificate command 
+				SL20Connector sl20Connector = (SL20Connector)slConnector;
+				
+				//use 'SecureSigningKeypair' per default
+				String keyId = SL20Connector.SecureSignatureKeypair;
+				
+				java.security.cert.X509Certificate x5cEnc = null;
+				if (WebConfiguration.isSL20EncryptionEnabled() && joseTools != null)
+					x5cEnc = joseTools.getEncryptionCertificate();
+				JsonObject getCertParams = 
+						SL20JSONBuilderUtils.createGetCertificateCommandParameters(
+								keyId, generateDataURLSL20(request, response), x5cEnc);
+				
+				JsonObject sl20Req = null;
+				String reqId = UUID.randomUUID().toString();
+				if (WebConfiguration.isSL20SigningEnabled()) {
+					String signedCertCommand = SL20JSONBuilderUtils.createSignedCommand(
+							SL20Constants.SL20_COMMAND_IDENTIFIER_GETCERTIFICATE, getCertParams, joseTools);
+					sl20Req = SL20JSONBuilderUtils.createGenericRequest(reqId, null, null, signedCertCommand);
+					
+				} else {
+					JsonObject getCertCommand = SL20JSONBuilderUtils.createCommand(SL20Constants.SL20_COMMAND_IDENTIFIER_GETCERTIFICATE, getCertParams);
+					sl20Req = SL20JSONBuilderUtils.createGenericRequest(reqId, null, getCertCommand, null);
+					
+				}	
+								
+				//send SL20 request via Backend connection
+				JsonObject sl20Resp = sl20Connector.sendSL20Request(sl20Req, null, generateBKUURL(connector));
+				if (sl20Resp == null) {
+					logger.info("Receive NO responce from SL2.0 connection. Process stops ... ");
+					throw new SLCommandoParserException();
+					
+				}
+				
+				VerificationResult respPayloadContainer = SL20JSONExtractorUtils.extractSL20PayLoad(
+						sl20Resp, joseTools, WebConfiguration.isSL20SigningRequired());
+				
+				if (respPayloadContainer.isValidSigned() == null)
+					logger.debug("Receive unsigned payLoad from VDA");
+					
+				JsonObject respPayload = respPayloadContainer.getPayload();
+				if (respPayload.get(SL20Constants.SL20_COMMAND_CONTAINER_NAME).getAsString()
+						.equals(SL20Constants.SL20_COMMAND_IDENTIFIER_REDIRECT)) {
+					logger.debug("Find 'redirect' command in VDA response ... ");									
+					JsonObject params = SL20JSONExtractorUtils.getJSONObjectValue(respPayload, SL20Constants.SL20_COMMAND_CONTAINER_PARAMS, true);					
+					String redirectURL = SL20JSONExtractorUtils.getStringValue(params, SL20Constants.SL20_COMMAND_PARAM_GENERAL_REDIRECT_URL, true);									
+					JsonObject command = SL20JSONExtractorUtils.getJSONObjectValue(params, SL20Constants.SL20_COMMAND_PARAM_GENERAL_REDIRECT_COMMAND, false);
+					String signedCommand = SL20JSONExtractorUtils.getStringValue(params, SL20Constants.SL20_COMMAND_PARAM_GENERAL_REDIRECT_SIGNEDCOMMAND, false);					
+
+					//create forward SL2.0 command
+					JsonObject sl20Forward = sl20Resp.deepCopy().getAsJsonObject();
+					SL20JSONBuilderUtils.addOnlyOnceOfTwo(sl20Forward, 
+							SL20Constants.SL20_PAYLOAD, SL20Constants.SL20_SIGNEDPAYLOAD, 
+							command, signedCommand);
+										
+					//store requestId
+					
+					request.getSession(false).setAttribute(PDF_SESSION_PREFIX + SL20Constants.SL20_REQID, reqId);
+
+					//forward SL2.0 command
+					SL20HttpBindingUtils.writeIntoResponse(request, response, sl20Forward, redirectURL);
+													
+				} else if (respPayload.get(SL20Constants.SL20_COMMAND_CONTAINER_NAME).getAsString()
+						.equals(SL20Constants.SL20_COMMAND_IDENTIFIER_ERROR)) { 
+					JsonObject result = SL20JSONExtractorUtils.getJSONObjectValue(respPayload, SL20Constants.SL20_COMMAND_CONTAINER_RESULT, false);
+					if (result  == null)
+						result = SL20JSONExtractorUtils.getJSONObjectValue(respPayload, SL20Constants.SL20_COMMAND_CONTAINER_PARAMS, false);
+					
+					String errorCode = SL20JSONExtractorUtils.getStringValue(result, SL20Constants.SL20_COMMAND_PARAM_GENERAL_RESPONSE_ERRORCODE, true);
+					String errorMsg = SL20JSONExtractorUtils.getStringValue(result, SL20Constants.SL20_COMMAND_PARAM_GENERAL_RESPONSE_ERRORMESSAGE, true);
+					
+					logger.info("Receive SL2.0 error. Code:" + errorCode + " Msg:" + errorMsg);
+					throw new SL20Exception("sl20.08");
+					
+				} else {
+					logger.warn("Received an unrecognized command: " + respPayload.get(SL20Constants.SL20_COMMAND_CONTAINER_NAME).getAsString());
+					throw new SLCommandoParserException();
+					
+				}
+				
+			} else
+				throw new PdfAsWebException("Invalid connector: " + slConnector.getClass().getName());
+			
+		} else if (statusRequest.needSignature()) {
+			logger.debug("Needing Signature from BKU");
+			// build SL Request for cms signature
+			RequestPackage pack = slConnector.createCMSRequest(
+					statusRequest.getSignatureData(),
+					statusRequest.getSignatureDataByteRange(),
+					statusRequest.getSignParameter());
+
+			if (slConnector instanceof BKUSLConnector) {						
 				String slRequest = SLMarschaller
 						.marshalToString(of
 								.createCreateCMSSignatureRequest(pack
 										.getRequestType()));
 
 				logger.trace("SL Request: " + slRequest);
-
+				
 				response.setContentType("text/xml");
 				response.getWriter().write(slRequest);
 				response.getWriter().close();
+				
+			} else if (slConnector instanceof SL20Connector) {				
+				//convert byte range
+				List<String> byteRanges = new ArrayList<String>();
+				for (int el : statusRequest.getSignatureDataByteRange())
+					byteRanges.add(String.valueOf(el));
+				
+				java.security.cert.X509Certificate x5cEnc = null;
+				if (WebConfiguration.isSL20EncryptionEnabled() && joseTools != null)
+					x5cEnc = joseTools.getEncryptionCertificate();
+
+				//set 'true' as default
+				boolean padesCompatibel = true;
+				if (pack.getRequestType().getPAdESFlag() != null)
+					padesCompatibel = pack.getRequestType().getPAdESFlag();
+				
+				JsonObject createCAdESSigParams = 
+						SL20JSONBuilderUtils.createCreateCAdESCommandParameters(
+								pack.getRequestType().getKeyboxIdentifier(), 
+								statusRequest.getSignatureData(), 
+								pack.getRequestType().getDataObject().getMetaInfo().getMimeType(), 
+								padesCompatibel , 
+								byteRanges, 
+								SL20Constants.SL20_COMMAND_PARAM_CREATE_SIG_CADES_CADESLEVEL_BASIC, 
+								generateDataURLSL20(request, response), 
+								x5cEnc) ;
+				
+				JsonObject sl20CreateCAdES = null;
+				String reqId = UUID.randomUUID().toString();
+				if (WebConfiguration.isSL20SigningEnabled()) {
+					String signedCertCommand = SL20JSONBuilderUtils.createSignedCommand(
+							SL20Constants.SL20_COMMAND_IDENTIFIER_CREATE_SIG_CADES, createCAdESSigParams, joseTools);
+					sl20CreateCAdES = SL20JSONBuilderUtils.createGenericRequest(reqId, null, null, signedCertCommand);
+					
+				} else {
+					JsonObject getCertCommand = SL20JSONBuilderUtils.createCommand(SL20Constants.SL20_COMMAND_IDENTIFIER_CREATE_SIG_CADES, createCAdESSigParams);
+					sl20CreateCAdES = SL20JSONBuilderUtils.createGenericRequest(UUID.randomUUID().toString(), null, getCertCommand, null);
+					
+				}	
+				
+				request.getSession(false).setAttribute(PDF_SESSION_PREFIX + SL20Constants.SL20_REQID, reqId);
+
+				//forward SL2.0 command
+				logger.trace("Write 'createCAdES' command to VDA: " + sl20CreateCAdES.toString());
+				StringWriter writer = new StringWriter();
+				writer.write(sl20CreateCAdES.toString());						
+				final byte[] content = writer.toString().getBytes("UTF-8");
+				response.setStatus(HttpServletResponse.SC_OK);
+				response.setContentLength(content.length);
+				response.setContentType(ContentType.APPLICATION_JSON.toString());						
+				response.getOutputStream().write(content);
+				
+			} else
+				throw new PdfAsWebException("Invalid connector: " + slConnector.getClass().getName());
+				
+				
+
+		} else if (statusRequest.isReady()) {
+			// TODO: store pdf document redirect to Finish URL
+			logger.debug("Document ready!");
+
+			SignResult result = pdfAs.finishSign(statusRequest);
+
+			ByteArrayOutputStream baos = (ByteArrayOutputStream) session
+					.getAttribute(PDF_OUTPUT);
+			baos.close();
+
+			PDFASVerificationResponse verResponse = new PDFASVerificationResponse();
+			List<VerifyResult> verResults = PdfAsHelper.synchornousVerify(
+					baos.toByteArray(), -2,
+					PdfAsHelper.getVerificationLevel(request), null);
+
+			if (verResults.size() != 1) {
+				throw new WebServiceException(
+						"Document verification failed!");
+			}
+			VerifyResult verifyResult = verResults.get(0);
 
-			} else if (statusRequest.isReady()) {
-				// TODO: store pdf document redirect to Finish URL
-				logger.debug("Document ready!");
-
-				SignResult result = pdfAs.finishSign(statusRequest);
-
-				ByteArrayOutputStream baos = (ByteArrayOutputStream) session
-						.getAttribute(PDF_OUTPUT);
-				baos.close();
-
-				PDFASVerificationResponse verResponse = new PDFASVerificationResponse();
-				List<VerifyResult> verResults = PdfAsHelper.synchornousVerify(
-						baos.toByteArray(), -2,
-						PdfAsHelper.getVerificationLevel(request), null);
+			verResponse.setCertificateCode(verifyResult
+					.getCertificateCheck().getCode());
+			verResponse.setValueCode(verifyResult.getValueCheckCode()
+					.getCode());
 
-				if (verResults.size() != 1) {
-					throw new WebServiceException(
-							"Document verification failed!");
-				}
-				VerifyResult verifyResult = verResults.get(0);
+			PdfAsHelper.setPDFASVerificationResponse(request, verResponse);
+			PdfAsHelper.setSignedPdf(request, response, baos.toByteArray());
 
-				verResponse.setCertificateCode(verifyResult
-						.getCertificateCheck().getCode());
-				verResponse.setValueCode(verifyResult.getValueCheckCode()
-						.getCode());
+			String signerCert = Base64.encodeBase64String(result
+					.getSignerCertificate().getEncoded());
 
-				PdfAsHelper.setPDFASVerificationResponse(request, verResponse);
-				PdfAsHelper.setSignedPdf(request, response, baos.toByteArray());
+			PdfAsHelper.setSignerCertificate(request, signerCert);
+			
+			if (slConnector instanceof BKUSLConnector) {
 				PdfAsHelper.gotoProvidePdf(context, request, response);
-
-				String signerCert = Base64.encodeBase64String(result
-						.getSignerCertificate().getEncoded());
-
-				PdfAsHelper.setSignerCertificate(request, signerCert);
-
-			} else {
-				throw new PdfAsWebException("Invalid state!");
-			}
+				
+			} else if (slConnector instanceof SL20Connector) {
+				//TODO: add code to send SL20 redirect command to redirect the user from DataURL connection to App Front-End connection
+				String callUrl = generateProvideURL(request, response);
+				String transactionId = (String) request.getAttribute(PdfAsHelper.PDF_SESSION_PREFIX + SL20Constants.SL20_TRANSACTIONID);
+				buildSL20RedirectResponse(request, response, transactionId, callUrl);
+				
+			} else
+				throw new PdfAsWebException("Invalid connector: " + slConnector.getClass().getName());
+			
 		} else {
-			throw new PdfAsWebException("Invalid connector: " + connector);
+			throw new PdfAsWebException("Invalid state!");
 		}
 	}
 
@@ -1338,6 +1533,11 @@ public class PdfAsHelper {
 		request.getSession(true);
 	}
 
+	public static String generateDataURLSL20(HttpServletRequest request,
+			HttpServletResponse response) {
+		return generateURL(request, response, PDF_SL20_DATAURL_PAGE);
+	}
+	
 	public static String generateDataURL(HttpServletRequest request,
 			HttpServletResponse response) {
 		return generateURL(request, response, PDF_DATAURL_PAGE);
@@ -1385,6 +1585,8 @@ public class PdfAsHelper {
 			return WebConfiguration.getOnlineBKUURL();
 		} else if (connector.equals("mobilebku")) {
 			return WebConfiguration.getHandyBKUURL();
+		} else if (connector.equals("sl20")) {
+			return WebConfiguration.getSecurityLayer20URL();
 		}
 		return WebConfiguration.getLocalBKUURL();
 	}
@@ -1542,4 +1744,64 @@ public class PdfAsHelper {
 	public static String getSCMRevision() {
 		return PdfAsFactory.getSCMRevision();
 	}
+	
+	public static void buildSL20RedirectResponse(HttpServletRequest request, HttpServletResponse response, String transactionId, String callURL) throws IOException, SL20Exception {		
+		//create response 
+		Map<String, String> reqParameters = UrlParameterExtractor.splitQuery(new URL(callURL));
+		
+		//extract URL without parameters
+		String url;
+		int paramIndex = callURL.indexOf("?");
+		if (paramIndex == -1)
+			url = callURL;
+		else
+			url = callURL.substring(0, paramIndex);
+		
+		JsonObject callReqParams = SL20JSONBuilderUtils.createCallCommandParameters(
+				url, 
+				SL20Constants.SL20_COMMAND_PARAM_GENERAL_CALL_METHOD_GET, 
+				false, 
+				reqParameters);
+		JsonObject callCommand = SL20JSONBuilderUtils.createCommand(SL20Constants.SL20_COMMAND_IDENTIFIER_CALL, callReqParams);
+		
+		//build first redirect command for app
+		JsonObject redirectOneParams = SL20JSONBuilderUtils.createRedirectCommandParameters(
+				null, 
+				callCommand, null, true);
+		JsonObject redirectOneCommand = SL20JSONBuilderUtils.createCommand(SL20Constants.SL20_COMMAND_IDENTIFIER_REDIRECT, redirectOneParams);
+						
+		//build second redirect command for IDP
+		JsonObject redirectTwoParams = SL20JSONBuilderUtils.createRedirectCommandParameters(
+				callURL, 
+				redirectOneCommand, null, false);
+		JsonObject redirectTwoCommand = SL20JSONBuilderUtils.createCommand(SL20Constants.SL20_COMMAND_IDENTIFIER_REDIRECT, redirectTwoParams);
+		
+		//build generic SL2.0 response container								
+		JsonObject respContainer = SL20JSONBuilderUtils.createGenericRequest(
+				UUID.randomUUID().toString(), 
+				transactionId, 
+				redirectTwoCommand, 
+				null); 
+		
+		//workaround for A-Trust
+		if (request.getHeader(SL20Constants.HTTP_HEADER_SL20_CLIENT_TYPE) != null && 
+				request.getHeader(SL20Constants.HTTP_HEADER_SL20_CLIENT_TYPE).equals(SL20Constants.HTTP_HEADER_VALUE_NATIVE)
+					|| true) {					
+			logger.debug("Client request containts 'native client' header ... ");
+			logger.trace("SL20 response to VDA: " + respContainer);
+			StringWriter writer = new StringWriter();
+			writer.write(respContainer.toString());						
+			final byte[] content = writer.toString().getBytes("UTF-8");
+			response.setStatus(HttpServletResponse.SC_OK);
+			response.setContentLength(content.length);
+			response.setContentType(ContentType.APPLICATION_JSON.toString());						
+			response.getOutputStream().write(content);
+			
+			
+		} else {
+			logger.info("SL2.0 DataURL communication needs http header: '" + SL20Constants.HTTP_HEADER_SL20_CLIENT_TYPE + "'");
+			throw new SL20Exception("sl20.06");
+			
+		}
+	}
 }
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/DataURLServlet.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/DataURLServlet.java
index 45861953..50c3b063 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/DataURLServlet.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/DataURLServlet.java
@@ -93,11 +93,11 @@ public class DataURLServlet extends HttpServlet {
 			if(jaxbObject.getValue() instanceof InfoboxReadResponseType) {
 				InfoboxReadResponseType infoboxReadResponseType = (InfoboxReadResponseType)jaxbObject.getValue();
 				logger.info("Got InfoboxReadResponseType");
-				PdfAsHelper.injectCertificate(request, response, infoboxReadResponseType, getServletContext());
+				PdfAsHelper.injectCertificate(request, response, PdfAsHelper.getCertificate(infoboxReadResponseType), getServletContext());
 			} else if(jaxbObject.getValue() instanceof CreateCMSSignatureResponseType) {
 				CreateCMSSignatureResponseType createCMSSignatureResponseType = (CreateCMSSignatureResponseType)jaxbObject.getValue();
 				logger.info("Got CreateCMSSignatureResponseType");
-				PdfAsHelper.injectSignature(request, response, createCMSSignatureResponseType, getServletContext());
+				PdfAsHelper.injectSignature(request, response, createCMSSignatureResponseType.getCMSSignature(), getServletContext());
 			} else if(jaxbObject.getValue() instanceof ErrorResponseType) {
 				ErrorResponseType errorResponseType = (ErrorResponseType)jaxbObject.getValue();
 				logger.warn("SecurityLayer: " + errorResponseType.getErrorCode() + " " + errorResponseType.getInfo());
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/ExternSignServlet.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/ExternSignServlet.java
index 3cea5247..1d2ab14e 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/ExternSignServlet.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/ExternSignServlet.java
@@ -354,7 +354,8 @@ public class ExternSignServlet extends HttpServlet {
 		logger.debug("Starting signature creation with: " + connector);
 		
 		//IPlainSigner signer;
-		if (connector.equals("bku") || connector.equals("onlinebku") || connector.equals("mobilebku")) {
+		if (connector.equals("bku") || connector.equals("onlinebku") || connector.equals("mobilebku")
+				|| connector.equals("sl20")) {
 			// start asynchronous signature creation
 			
 			if(connector.equals("bku")) {
@@ -372,6 +373,11 @@ public class ExternSignServlet extends HttpServlet {
 					throw new PdfAsWebException("Invalid connector bku is not supported");
 				}
 			}
+			if (connector.equals("sl20")) {
+				if(WebConfiguration.getSecurityLayer20URL() == null) {
+					throw new PdfAsWebException("Invalid connector bku is not supported");
+				}
+			}
 
 			PdfAsHelper.setStatisticEvent(request, response, statisticEvent);
 			
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/JSONAPIServlet.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/JSONAPIServlet.java
index 0cee185a..13d874e8 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/JSONAPIServlet.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/JSONAPIServlet.java
@@ -119,7 +119,9 @@ public class JSONAPIServlet extends HttpServlet {
                 connectorEnum = PDFASSignParameters.Connector.MOBILEBKU;
             } else if(PDFASSignParameters.Connector.ONLINEBKU.equalsName(connector)) {
                 connectorEnum = PDFASSignParameters.Connector.ONLINEBKU;
-            }
+            } else if(PDFASSignParameters.Connector.SECLAYER20.equalsName(connector)) {
+                connectorEnum = PDFASSignParameters.Connector.SECLAYER20;
+            } 
 
             if(connectorEnum == null) {
                 throw new ServletException(
@@ -212,6 +214,13 @@ public class JSONAPIServlet extends HttpServlet {
                                     "Invalid connector mobilebku is not supported");
                         }
                     }
+                    
+                    if (PDFASSignParameters.Connector.SECLAYER20.equals(connectorEnum)) {
+                        if (WebConfiguration.getSecurityLayer20URL() == null) {
+                            throw new PdfAsWebException(
+                                    "Invalid connector mobilebku is not supported");
+                        }
+                    }
 
 
                     PdfAsHelper.startSignatureJson(request, response, getServletContext(),
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/SLDataURLServlet.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/SLDataURLServlet.java
new file mode 100644
index 00000000..7ddf0a55
--- /dev/null
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/SLDataURLServlet.java
@@ -0,0 +1,234 @@
+package at.gv.egiz.pdfas.web.servlets;
+
+import java.io.IOException;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Base64;
+import java.util.List;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.MultipartConfig;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.commons.lang3.StringUtils;
+import org.jose4j.base64url.Base64Url;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.google.gson.JsonSyntaxException;
+
+import at.gv.egiz.pdfas.lib.util.StreamUtils;
+import at.gv.egiz.pdfas.web.config.WebConfiguration;
+import at.gv.egiz.pdfas.web.helper.PdfAsHelper;
+import at.gv.egiz.pdfas.web.sl20.JsonSecurityUtils;
+import at.gv.egiz.pdfas.web.sl20.X509Utils;
+import at.gv.egiz.sl20.data.VerificationResult;
+import at.gv.egiz.sl20.exceptions.SL20Exception;
+import at.gv.egiz.sl20.exceptions.SL20SecurityException;
+import at.gv.egiz.sl20.exceptions.SLCommandoParserException;
+import at.gv.egiz.sl20.utils.SL20Constants;
+import at.gv.egiz.sl20.utils.SL20JSONExtractorUtils;
+
+@MultipartConfig
+public class SLDataURLServlet extends HttpServlet {
+
+	private static final Logger logger = LoggerFactory
+			.getLogger(SLDataURLServlet.class);
+	
+	private static final long serialVersionUID = 1L;
+
+	/**
+	 * @see HttpServlet#HttpServlet()
+	 */
+	public SLDataURLServlet() {
+		super();
+	}
+
+	/**
+	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
+	 *      response)
+	 */
+	protected void doGet(HttpServletRequest request,
+			HttpServletResponse response) throws ServletException, IOException {
+		this.process(request, response);
+	}
+
+	/**
+	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
+	 *      response)
+	 */
+	protected void doPost(HttpServletRequest request,
+			HttpServletResponse response) throws ServletException, IOException {
+		this.process(request, response);
+	}
+
+	protected void process(HttpServletRequest request,
+			HttpServletResponse response) throws ServletException, IOException {
+		
+		JsonObject sl20ReqObj = null;	
+		try {
+			if(!PdfAsHelper.checkDataUrlAccess(request)) {
+				throw new Exception("No valid dataURL access");
+			}
+			
+			PdfAsHelper.setFromDataUrl(request);
+						
+			String sl20Result = request.getParameter(SL20Constants.PARAM_SL20_REQ_COMMAND_PARAM);
+			if (StringUtils.isEmpty(sl20Result)) {
+				//Workaround for SIC Handy-Signature, because it sends result in InputStream
+				String isReqInput = StreamUtils.readStream(request.getInputStream(), "UTF-8");					
+				if (StringUtils.isNotEmpty(isReqInput)) {
+					logger.info("Use SIC Handy-Signature work-around!");
+					sl20Result = isReqInput.substring("slcommand=".length());
+					
+				} else {					
+					logger.info("NO SL2.0 commando or result FOUND.");
+					throw new SL20Exception("sl20.04", null);
+				}
+				
+			}
+
+			logger.trace("Received SL2.0 result: " + sl20Result);		
+			
+			//parse SL2.0 command/result into JSON				
+			try {
+				JsonParser jsonParser = new JsonParser();
+				JsonElement sl20Req = jsonParser.parse(Base64Url.decodeToUtf8String(sl20Result));
+				sl20ReqObj = sl20Req.getAsJsonObject();
+				
+			} catch (JsonSyntaxException e) {
+				logger.warn("SL2.0 command or result is NOT valid JSON.", e);
+				logger.debug("SL2.0 msg: " + sl20Result);
+				throw new SL20Exception("sl20.02", e);
+				
+			}
+			
+			//extract transactionId
+			String transactionId = SL20JSONExtractorUtils.getStringValue(sl20ReqObj, SL20Constants.SL20_TRANSACTIONID, false);
+			if (StringUtils.isNotEmpty(transactionId))
+					request.setAttribute(PdfAsHelper.PDF_SESSION_PREFIX + SL20Constants.SL20_TRANSACTIONID, transactionId);
+			
+			
+			//validate reqId with inResponseTo 
+			String sl20ReqId = (String) request.getSession(false).getAttribute(PdfAsHelper.PDF_SESSION_PREFIX + SL20Constants.SL20_REQID);
+			String inRespTo = SL20JSONExtractorUtils.getStringValue(sl20ReqObj, SL20Constants.SL20_INRESPTO, true);
+			if (sl20ReqId == null || !sl20ReqId.equals(inRespTo)) {
+				logger.info("SL20 'reqId': " + sl20ReqId + " does NOT match to 'inResponseTo':" + inRespTo);
+				throw new SL20SecurityException("SL20 'reqId': " + sl20ReqId + " does NOT match to 'inResponseTo':" + inRespTo);
+			}
+			
+			JsonSecurityUtils joseTools = JsonSecurityUtils.getInstance();
+			if (!joseTools.isInitialized())
+				joseTools = null;
+			
+			//validate signature
+			VerificationResult payLoadContainer = SL20JSONExtractorUtils.extractSL20PayLoad(sl20ReqObj, joseTools, 
+					WebConfiguration.isSL20SigningRequired());
+			
+			if ( (payLoadContainer.isValidSigned() == null || !payLoadContainer.isValidSigned())) {
+				if (WebConfiguration.isSL20SigningRequired()) {
+					logger.info("SL20 result from VDA was not valid signed");
+					throw new SL20SecurityException("Signature on SL20 result NOT valid.");
+					
+				} else {
+					logger.warn("SL20 result from VDA is NOT valid signed, but signatures-verification is DISABLED by configuration!");
+					
+				}				
+			}
+						
+			//extract payloaf
+			JsonObject payLoad = payLoadContainer.getPayload();
+			
+			//check response type
+			if (SL20JSONExtractorUtils.getStringValue(
+					payLoad, SL20Constants.SL20_COMMAND_CONTAINER_NAME, true)
+						.equals(SL20Constants.SL20_COMMAND_IDENTIFIER_GETCERTIFICATE)) {
+				logger.debug("Find " + SL20Constants.SL20_COMMAND_IDENTIFIER_GETCERTIFICATE + " result .... ");
+								
+				JsonElement getCertificateResult = SL20JSONExtractorUtils.extractSL20Result(
+						payLoad, joseTools, 
+						WebConfiguration.isSL20EncryptionRequired());
+
+				//extract certificates												
+				List<String> certsB64 = SL20JSONExtractorUtils.getListOfStringElements(getCertificateResult.getAsJsonObject(), 
+						SL20Constants.SL20_COMMAND_PARAM_GETCERTIFICATE_RESULT_CERTIFICATE, 
+						true);
+				
+				if (certsB64.isEmpty()) {
+					logger.warn("SL20 'getCertificate' result contains NO certificate");
+					throw new SLCommandoParserException();
+					
+				} else if (certsB64.size() == 1) {
+					logger.debug("SL20 'getCertificate' result contains only one certificate");
+					PdfAsHelper.injectCertificate(request, response, Base64.getDecoder().decode(certsB64.get(0)), getServletContext());	
+					
+				} else {
+					logger.debug("SL20 'getCertificate' result contains more than one certificate. Certificates must be sorted ... ");
+					List<X509Certificate> certs = new ArrayList<X509Certificate>();
+					for (String certB64 : certsB64)
+						certs.add(new iaik.x509.X509Certificate(Base64.getDecoder().decode(certB64)));
+												
+					List<X509Certificate> sortedCerts = X509Utils.sortCertificates(certs);
+					logger.debug("Sorting of certificate completed. Select end-user certificate ... ");
+					PdfAsHelper.injectCertificate(request, response, Base64.getDecoder().decode(sortedCerts.get(0).getEncoded()), getServletContext());
+					
+				}
+				
+			} else if (SL20JSONExtractorUtils.getStringValue(
+					payLoad, SL20Constants.SL20_COMMAND_CONTAINER_NAME, true)
+					.equals(SL20Constants.SL20_COMMAND_IDENTIFIER_CREATE_SIG_CADES)) {
+				logger.debug("Find " + SL20Constants.SL20_COMMAND_IDENTIFIER_CREATE_SIG_CADES + " result .... ");
+				
+				JsonElement getCertificateResult = SL20JSONExtractorUtils.extractSL20Result(
+						payLoad, joseTools, 
+						WebConfiguration.isSL20EncryptionRequired());
+
+				//extract CAdES signature
+				String cadesSigB64 = SL20JSONExtractorUtils.getStringValue(
+						getCertificateResult.getAsJsonObject(), 
+						SL20Constants.SL20_COMMAND_PARAM_CREATE_SIG_CADES_RESULT_SIGNATURE, 
+						true);
+				
+				if (StringUtils.isEmpty(cadesSigB64)) {
+					logger.warn("SL20 'createCAdES' result contains NO signature");
+					throw new SLCommandoParserException();
+				}
+				
+				PdfAsHelper.injectSignature(request, response, Base64.getDecoder().decode(cadesSigB64), getServletContext());
+				
+			} else {
+				logger.info("SL20 response is NOT a " + SL20Constants.SL20_COMMAND_IDENTIFIER_QUALIFIEDEID + " result");
+				throw new SLCommandoParserException();
+				
+			}	
+			
+		} catch (Exception e) {
+			logger.warn("Error in DataURL Servlet. " , e);
+			PdfAsHelper.setSessionException(request, response, e.getMessage(),
+					e);
+			
+			if (PdfAsHelper.getFromDataUrl(request)) {
+				String errorUrl = PdfAsHelper.generateErrorURL(request, response);
+				try {
+					String transactionId = null;
+					if (sl20ReqObj != null)
+						transactionId = SL20JSONExtractorUtils.getStringValue(sl20ReqObj, SL20Constants.SL20_TRANSACTIONID, false);
+					
+					PdfAsHelper.buildSL20RedirectResponse(request, response, transactionId, errorUrl);
+					
+				} catch (SL20Exception e1) {
+					logger.error("SL20 error-handling FAILED", e);
+					response.sendError(500, "Internal Server Error.");
+					
+				}
+				
+			} else			
+				PdfAsHelper.gotoError(getServletContext(), request, response);
+		}
+	}
+}
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/UIEntryPointServlet.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/UIEntryPointServlet.java
index e8ac3658..73f8299c 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/UIEntryPointServlet.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/UIEntryPointServlet.java
@@ -131,7 +131,8 @@ public class UIEntryPointServlet extends HttpServlet {
 			// IPlainSigner signer;
 			if (connector.equals(Connector.BKU)
 					|| connector.equals(Connector.ONLINEBKU)
-					|| connector.equals(Connector.MOBILEBKU)) {
+					|| connector.equals(Connector.MOBILEBKU)
+					|| connector.equals(Connector.SECLAYER20)) {
 				// start asynchronous signature creation
 
 				if (connector.equals(Connector.BKU)) {
@@ -154,6 +155,14 @@ public class UIEntryPointServlet extends HttpServlet {
 								"Invalid connector mobilebku is not supported");
 					}
 				}
+				
+				if (connector.equals(Connector.SECLAYER20)) {
+					if (WebConfiguration.getSecurityLayer20URL() == null) {
+						throw new PdfAsWebException(
+								"Invalid connector mobilebku is not supported");
+					}
+				}
+				
 				Map<String, String> map = null;
 				if (pdfAsRequest.getParameters().getPreprocessor() != null) {
 					map = pdfAsRequest.getParameters().getPreprocessor()
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/sl20/JsonSecurityUtils.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/sl20/JsonSecurityUtils.java
new file mode 100644
index 00000000..141808de
--- /dev/null
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/sl20/JsonSecurityUtils.java
@@ -0,0 +1,381 @@
+package at.gv.egiz.pdfas.web.sl20;
+
+import java.io.IOException;
+import java.security.Key;
+import java.security.KeyStore;
+import java.security.PrivateKey;
+import java.security.cert.Certificate;
+import java.security.cert.CertificateEncodingException;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Base64;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.List;
+
+import javax.annotation.PostConstruct;
+
+import org.apache.commons.lang3.StringUtils;
+import org.bouncycastle.util.encoders.Base64Encoder;
+import org.jose4j.jwa.AlgorithmConstraints;
+import org.jose4j.jwa.AlgorithmConstraints.ConstraintType;
+import org.jose4j.jwe.JsonWebEncryption;
+import org.jose4j.jws.AlgorithmIdentifiers;
+import org.jose4j.jws.JsonWebSignature;
+import org.jose4j.jwx.JsonWebStructure;
+import org.jose4j.keys.X509Util;
+import org.jose4j.keys.resolvers.X509VerificationKeyResolver;
+import org.jose4j.lang.JoseException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParser;
+import com.google.gson.JsonSyntaxException;
+
+import at.gv.egiz.pdfas.web.config.WebConfiguration;
+import at.gv.egiz.sl20.data.VerificationResult;
+import at.gv.egiz.sl20.exceptions.SL20Exception;
+import at.gv.egiz.sl20.exceptions.SL20SecurityException;
+import at.gv.egiz.sl20.exceptions.SLCommandoBuildException;
+import at.gv.egiz.sl20.exceptions.SLCommandoParserException;
+import at.gv.egiz.sl20.utils.IJOSETools;
+import at.gv.egiz.sl20.utils.SL20Constants;
+
+public class JsonSecurityUtils implements IJOSETools{
+
+	private static final Logger logger = LoggerFactory.getLogger(JsonSecurityUtils.class);
+	
+	private Key signPrivKey = null;
+	private X509Certificate[] signCertChain = null;	
+	private Key encPrivKey = null;
+	private X509Certificate[] encCertChain = null;	
+	private List<X509Certificate> trustedCerts = new ArrayList<X509Certificate>();
+	
+	private boolean isInitialized = false;
+	
+	private static JsonSecurityUtils instance = null;
+		
+	public static JsonSecurityUtils getInstance() {
+		if (instance == null) {
+			instance = new JsonSecurityUtils();
+			instance.initalize();
+		}
+		
+		return instance;
+	}
+	
+	private JsonSecurityUtils() {
+		
+		
+	}
+	
+	protected synchronized void initalize() {
+		logger.info("Initialize SL2.0 authentication security constrains ... ");
+		try {
+			String keyStorePath = getKeyStoreFilePath();
+			
+			if (StringUtils.isNotEmpty(keyStorePath)) {
+				KeyStore keyStore = KeyStoreUtils.loadKeyStore(getKeyStoreFilePath(), 
+						getKeyStorePassword());
+				
+				//load signing key
+				signPrivKey = keyStore.getKey(getSigningKeyAlias(), getSigningKeyPassword().toCharArray());
+				Certificate[] certChainSigning = keyStore.getCertificateChain(getSigningKeyAlias());
+				signCertChain = new X509Certificate[certChainSigning.length];
+				for (int i=0; i<certChainSigning.length; i++) {
+					if (certChainSigning[i] instanceof X509Certificate) {
+						signCertChain[i] = (X509Certificate)certChainSigning[i];
+					} else
+						logger.warn("NO X509 certificate for signing: " + certChainSigning[i].getType());
+					
+				}
+				
+				//load encryption key
+				try {
+					encPrivKey = keyStore.getKey(getEncryptionKeyAlias(), getEncryptionKeyPassword().toCharArray());
+					if (encPrivKey != null) {
+						Certificate[] certChainEncryption = keyStore.getCertificateChain(getEncryptionKeyAlias());
+						encCertChain = new X509Certificate[certChainEncryption.length];
+						for (int i=0; i<certChainEncryption.length; i++) {
+							if (certChainEncryption[i] instanceof X509Certificate) {
+								encCertChain[i] = (X509Certificate)certChainEncryption[i];
+							} else
+								logger.warn("NO X509 certificate for encryption: " + certChainEncryption[i].getType());
+						}									
+					} else
+						logger.info("No encryption key for SL2.0 found. End-to-End encryption is not used.");
+					
+				} catch (Exception e) {
+					logger.warn("No encryption key for SL2.0 found. End-to-End encryption is not used. Reason: " + e.getMessage(), e);
+			
+				}
+				
+				//load trusted certificates
+				Enumeration<String> aliases = keyStore.aliases();
+				while(aliases.hasMoreElements()) {
+					String el = aliases.nextElement();
+					logger.trace("Process TrustStoreEntry: " + el);
+					if (keyStore.isCertificateEntry(el)) {
+						Certificate cert = keyStore.getCertificate(el); 
+						if (cert != null && cert instanceof X509Certificate)
+							trustedCerts.add((X509Certificate) cert);
+						else
+							logger.info("Can not process entry: " + el + ". Reason: " + cert.toString());
+						
+					}
+				}
+	
+				//some short validation
+				if (signPrivKey == null || !(signPrivKey instanceof PrivateKey)) {
+					logger.info("Can NOT open privateKey for SL2.0 signing. KeyStore=" + getKeyStoreFilePath());
+					throw new SL20Exception("sl20.03");
+					
+				}
+				
+				if (signCertChain == null || signCertChain.length == 0) {
+					logger.info("NO certificate for SL2.0 signing. KeyStore=" + getKeyStoreFilePath());
+					throw new SL20Exception("sl20.03");
+					
+				}
+				
+				isInitialized = true;
+				logger.info("SL2.0 authentication security constrains initialized.");
+				
+			} else
+				logger.info("SL2.0 security constrains not configurated!");
+			
+		} catch ( Exception e) {
+			logger.error("SL2.0 security constrains initialization FAILED.", e);
+			
+		}
+		
+	}
+	
+	
+	@Override
+	public String createSignature(String payLoad) throws SLCommandoBuildException {
+		try {
+			JsonWebSignature jws = new JsonWebSignature();
+			
+			//set payload
+			jws.setPayload(payLoad);
+		
+			//set basic header		
+			jws.setContentTypeHeaderValue(SL20Constants.SL20_CONTENTTYPE_SIGNED_COMMAND);
+		
+			//set signing information
+			jws.setAlgorithmHeaderValue(AlgorithmIdentifiers.RSA_USING_SHA256);
+			jws.setKey(signPrivKey);
+			
+			//TODO:
+			jws.setCertificateChainHeaderValue(signCertChain);
+			jws.setX509CertSha256ThumbprintHeaderValue(signCertChain[0]);
+						
+			return jws.getCompactSerialization();
+			
+		} catch (JoseException e) {
+			logger.warn("Can NOT sign SL2.0 command.", e);
+			throw new SLCommandoBuildException(e);
+			
+		}
+		
+	}
+	
+	@Override
+	public VerificationResult validateSignature(String serializedContent) throws SL20Exception {
+		try {
+			JsonWebSignature jws = new JsonWebSignature();
+			//set payload
+			jws.setCompactSerialization(serializedContent);
+				
+			//set security constrains
+			jws.setAlgorithmConstraints(new AlgorithmConstraints(ConstraintType.WHITELIST,   
+					SL20Constants.SL20_ALGORITHM_WHITELIST_SIGNING.toArray(new String[SL20Constants.SL20_ALGORITHM_WHITELIST_SIGNING.size()])));
+			
+			//load signinc certs
+			Key selectedKey = null;
+			List<X509Certificate> x5cCerts = jws.getCertificateChainHeaderValue();
+			String x5t256 = jws.getX509CertSha256ThumbprintHeaderValue();
+			if (x5cCerts != null) {
+				logger.debug("Found x509 certificate in JOSE header ... ");
+				logger.trace("Sorting received X509 certificates ... ");
+				List<X509Certificate> sortedX5cCerts  = X509Utils.sortCertificates(x5cCerts);
+				
+				if (trustedCerts.contains(sortedX5cCerts.get(0))) {
+					selectedKey = sortedX5cCerts.get(0).getPublicKey();
+					
+				} else {
+					logger.info("Can NOT find JOSE certificate in truststore.");
+					logger.debug("JOSE certificate: " + sortedX5cCerts.get(0).toString());
+					try {						
+						logger.debug("Cert: " + Base64.getEncoder().encodeToString(sortedX5cCerts.get(0).getEncoded()));
+						
+					} catch (CertificateEncodingException e) {
+						e.printStackTrace();
+						
+					}
+					
+				}
+				
+			} else if (StringUtils.isNotEmpty(x5t256)) {
+				logger.debug("Found x5t256 fingerprint in JOSE header .... ");
+				X509VerificationKeyResolver x509VerificationKeyResolver = new X509VerificationKeyResolver(trustedCerts);
+				selectedKey = x509VerificationKeyResolver.resolveKey(jws, Collections.<JsonWebStructure>emptyList());
+				
+			} else {
+				logger.info("Signed SL2.0 response contains NO signature certificate or NO certificate fingerprint");
+				throw new SLCommandoParserException();
+				
+			}
+					
+			if (selectedKey == null) {
+				logger.info("Can NOT select verification key for JWS. Signature verification FAILED.");
+				throw new SLCommandoParserException();
+				
+			}
+			
+			//set verification key
+			jws.setKey(selectedKey);
+			
+			//validate signature
+			boolean valid = jws.verifySignature();
+			if (!valid) {
+				logger.info("JWS signature invalide. Stopping authentication process ...");
+				logger.debug("Received JWS msg: " + serializedContent);
+				throw new SL20SecurityException();
+				
+			}
+				
+			
+			//load payLoad
+			logger.debug("SL2.0 commando signature validation sucessfull");
+			JsonElement sl20Req = new JsonParser().parse(jws.getPayload());
+			
+			return new VerificationResult(sl20Req.getAsJsonObject(), null, valid) ;
+			
+		} catch (JoseException e) {
+			logger.warn("SL2.0 commando signature validation FAILED", e);
+			throw new SL20SecurityException(e);
+			
+		}
+					
+	}
+	
+
+	@Override
+	public JsonElement decryptPayload(String compactSerialization) throws SL20Exception {
+		try {			
+			JsonWebEncryption receiverJwe = new JsonWebEncryption();
+					
+			//set security constrains
+			receiverJwe.setAlgorithmConstraints(
+					new AlgorithmConstraints(ConstraintType.WHITELIST,
+							SL20Constants.SL20_ALGORITHM_WHITELIST_KEYENCRYPTION.toArray(new String[SL20Constants.SL20_ALGORITHM_WHITELIST_KEYENCRYPTION.size()])));
+			receiverJwe.setContentEncryptionAlgorithmConstraints(
+					new AlgorithmConstraints(ConstraintType.WHITELIST,
+							SL20Constants.SL20_ALGORITHM_WHITELIST_ENCRYPTION.toArray(new String[SL20Constants.SL20_ALGORITHM_WHITELIST_ENCRYPTION.size()])));
+		
+			//set payload
+			receiverJwe.setCompactSerialization(compactSerialization);
+
+			
+			//validate key from header against key from config
+			List<X509Certificate> x5cCerts = receiverJwe.getCertificateChainHeaderValue();
+			String x5t256 = receiverJwe.getX509CertSha256ThumbprintHeaderValue();
+			if (x5cCerts != null) {
+				logger.debug("Found x509 certificate in JOSE header ... ");
+				logger.trace("Sorting received X509 certificates ... ");
+				List<X509Certificate> sortedX5cCerts  = X509Utils.sortCertificates(x5cCerts);
+				
+				if (!sortedX5cCerts.get(0).equals(encCertChain[0])) {
+					logger.info("Certificate from JOSE header does NOT match encryption certificate");
+					logger.debug("JOSE certificate: " + sortedX5cCerts.get(0).toString());
+					
+					try {
+						logger.debug("Cert: " + Base64.getEncoder().encodeToString(sortedX5cCerts.get(0).getEncoded()));
+					} catch (CertificateEncodingException e) {
+						e.printStackTrace();
+					}
+					throw new SL20Exception("sl20.05");
+				}
+				
+			} else if (StringUtils.isNotEmpty(x5t256)) {
+				logger.debug("Found x5t256 fingerprint in JOSE header .... ");
+				String certFingerPrint = X509Util.x5tS256(encCertChain[0]);
+				if (!certFingerPrint.equals(x5t256)) {
+					logger.info("X5t256 from JOSE header does NOT match encryption certificate");
+					logger.debug("X5t256 from JOSE header: " + x5t256 + " Encrytption cert: " + certFingerPrint);
+					throw new SL20Exception("sl20.05");
+					
+				}
+				
+			} else {
+				logger.info("Signed SL2.0 response contains NO signature certificate or NO certificate fingerprint");
+				throw new SLCommandoParserException();
+				
+			}
+						
+			//set key
+			receiverJwe.setKey(encPrivKey);
+			
+						
+			//decrypt payload			
+			return new JsonParser().parse(receiverJwe.getPlaintextString());
+			
+		} catch (JoseException e) {
+			logger.warn("SL2.0 result decryption FAILED", e);
+			throw new SL20SecurityException(e);
+			
+		} catch ( JsonSyntaxException e) {
+			logger.warn("Decrypted SL2.0 result is NOT a valid JSON.", e);
+			throw new SLCommandoParserException(e);
+			
+		}
+		
+	}
+	
+	
+	
+	@Override
+	public X509Certificate getEncryptionCertificate() {
+		//TODO: maybe update after SL2.0 update on encryption certificate parts
+		if (encCertChain !=null && encCertChain.length > 0)
+			return encCertChain[0];
+		else
+			return null;
+	}
+	
+	@Override
+	public boolean isInitialized() {
+		return isInitialized;
+		
+	}
+	
+	private String getKeyStoreFilePath() {
+		return WebConfiguration.getSL20KeyStorePath();
+	}
+	
+	private String getKeyStorePassword() {
+		return WebConfiguration.getSL20KeyStorePassword();
+
+	}
+	
+	private String getSigningKeyAlias() {
+		return WebConfiguration.getSL20KeySigningAlias();
+	}
+	
+	private String getSigningKeyPassword() {
+		return WebConfiguration.getSL20KeySigningPassword();
+		
+	}
+
+	private String getEncryptionKeyAlias() {
+		return WebConfiguration.getSL20KeyEncryptionAlias();
+	}
+	
+	private String getEncryptionKeyPassword() {
+		return WebConfiguration.getSL20KeyEncryptionPassword();
+	}
+	
+}
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/sl20/KeyStoreUtils.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/sl20/KeyStoreUtils.java
new file mode 100644
index 00000000..c7472a22
--- /dev/null
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/sl20/KeyStoreUtils.java
@@ -0,0 +1,222 @@
+/*
+ * Copyright 2003 Federal Chancellery Austria
+ * MOA-ID has been developed in a cooperation between BRZ, the Federal
+ * Chancellery Austria - ICT staff unit, and Graz University of Technology.
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://www.osor.eu/eupl/
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ *
+ * This product combines work with different licenses. See the "NOTICE" text
+ * file for details on the various modules and licenses.
+ * The "NOTICE" text file is part of the distribution. Any derivative works
+ * that you distribute must include a readable copy of the "NOTICE" text file.
+ */
+
+
+package at.gv.egiz.pdfas.web.sl20;
+
+import iaik.x509.X509Certificate;
+
+import java.io.BufferedInputStream;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.security.GeneralSecurityException;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.cert.Certificate;
+
+/**
+ * Utility for creating and loading key stores.
+ * 
+ * @author Paul Ivancsics
+ * @version $Id$
+ */
+public class KeyStoreUtils {
+	
+	/**
+	 * JAVA KeyStore
+	 */
+	private static final String KEYSTORE_TYPE_JKS = "JKS";
+	
+	/**
+	 * PKCS12 KeyStore
+	 */
+	private static final String KEYSTORE_TYPE_PKCS12 = "PKCS12";
+	
+	
+
+  /**
+   * Loads a key store from file.
+   * 
+   * @param keystoreType key store type
+   * @param urlString URL of key store
+   * @param password password protecting the key store
+   * @return key store loaded
+   * @throws IOException thrown while reading the key store from file
+   * @throws GeneralSecurityException thrown while creating the key store
+   */
+  public static KeyStore loadKeyStore(
+    String keystoreType,
+    String urlString,
+    String password)
+    throws IOException, GeneralSecurityException {
+
+    URL keystoreURL = new URL(urlString);
+    InputStream in = keystoreURL.openStream();
+    return loadKeyStore(keystoreType, in, password);
+  }
+  /**
+   * Loads a key store from an <code>InputStream</code>, and
+   * closes the <code>InputStream</code>.
+   * 
+   * @param keystoreType key store type
+   * @param in input stream
+   * @param password password protecting the key store
+   * @return key store loaded
+   * @throws IOException thrown while reading the key store from the stream
+   * @throws GeneralSecurityException thrown while creating the key store
+   */
+  public static KeyStore loadKeyStore(
+    String keystoreType,
+    InputStream in,
+    String password)
+    throws IOException, GeneralSecurityException {
+
+    char[] chPassword = null;
+    if (password != null)
+      chPassword = password.toCharArray();
+    KeyStore ks = KeyStore.getInstance(keystoreType);
+    ks.load(in, chPassword);
+    in.close();
+    return ks;
+  }
+  /**
+   * Creates a key store from X509 certificate files, aliasing them with
+   * the index in the <code>String[]</code>, starting with <code>"0"</code>.
+   * 
+   * @param keyStoreType key store type
+   * @param certFilenames certificate filenames
+   * @return key store created
+   * @throws IOException thrown while reading the certificates from file
+   * @throws GeneralSecurityException thrown while creating the key store
+   */
+  public static KeyStore createKeyStore(
+    String keyStoreType,
+    String[] certFilenames)
+    throws IOException, GeneralSecurityException {
+
+    KeyStore ks = KeyStore.getInstance(keyStoreType);
+    ks.load(null, null);
+    for (int i = 0; i < certFilenames.length; i++) {
+      Certificate cert = loadCertificate(certFilenames[i]);
+      ks.setCertificateEntry("" + i, cert);
+    }
+    return ks;
+  }
+//  /**
+//   * Creates a key store from a directory containg X509 certificate files, 
+//   * aliasing them with the index in the <code>String[]</code>, starting with <code>"0"</code>.
+//   * All the files in the directory are considered to be certificates.
+//   * 
+//   * @param keyStoreType key store type
+//   * @param certDirURLString file URL of directory containing certificate filenames
+//   * @return key store created
+//   * @throws IOException thrown while reading the certificates from file
+//   * @throws GeneralSecurityException thrown while creating the key store
+//   */
+//  public static KeyStore createKeyStoreFromCertificateDirectory(
+//    String keyStoreType,
+//    String certDirURLString)
+//    throws IOException, GeneralSecurityException {
+//
+//    URL certDirURL = new URL(certDirURLString);
+//    String certDirname = certDirURL.getFile();
+//    File certDir = new File(certDirname);
+//    String[] certFilenames = certDir.list();
+//    String separator =
+//      (certDirname.endsWith(File.separator) ? "" : File.separator);
+//    for (int i = 0; i < certFilenames.length; i++) {
+//      certFilenames[i] = certDirname + separator + certFilenames[i];
+//    }
+//    return createKeyStore(keyStoreType, certFilenames);
+//  }
+
+  /**
+   * Loads an X509 certificate from file.
+   * @param certFilename filename
+   * @return the certificate loaded
+   * @throws IOException thrown while reading the certificate from file
+   * @throws GeneralSecurityException thrown while creating the certificate
+   */
+  private static Certificate loadCertificate(String certFilename)
+    throws IOException, GeneralSecurityException {
+
+    FileInputStream in = new FileInputStream(certFilename);
+    Certificate cert = new X509Certificate(in);
+    in.close();
+    return cert;
+  }
+  
+ 
+	/**
+	 * Loads a keyStore without knowing the keyStore type
+	 * @param keyStorePath URL to the keyStore
+	 * @param password Password protecting the keyStore
+	 * @return keyStore loaded
+	 * @throws KeyStoreException thrown if keyStore cannot be loaded
+	 * @throws FileNotFoundException 
+	 * @throws IOException 
+	 */
+  public static KeyStore loadKeyStore(String keyStorePath, String password) throws KeyStoreException, IOException{
+		
+		//InputStream is = new FileInputStream(keyStorePath);
+	  	URL keystoreURL = new URL(keyStorePath);
+	    InputStream in = keystoreURL.openStream();
+		InputStream isBuffered = new BufferedInputStream(in);				
+		return loadKeyStore(isBuffered, password);
+		
+	}
+	
+	/**
+	 * Loads a keyStore without knowing the keyStore type
+	 * @param in input stream
+	 * @param password Password protecting the keyStore
+	 * @return keyStore loaded
+	 * @throws KeyStoreException thrown if keyStore cannot be loaded
+	 * @throws FileNotFoundException 
+	 * @throws IOException 
+	 */
+public static KeyStore loadKeyStore(InputStream is, String password) throws KeyStoreException, IOException{		
+		is.mark(1024*1024);
+		KeyStore ks = null;
+		try {
+			try {				
+				ks = loadKeyStore(KEYSTORE_TYPE_PKCS12, is, password);
+			} catch (IOException e2) {
+				is.reset();				
+				ks = loadKeyStore(KEYSTORE_TYPE_JKS, is, password);
+			}
+		} catch(Exception e) {			
+			e.printStackTrace();
+			//throw new KeyStoreException(e);
+		}
+		return ks;	
+						
+	}
+  
+	
+
+
+}
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/sl20/SL20HttpBindingUtils.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/sl20/SL20HttpBindingUtils.java
new file mode 100644
index 00000000..f5d6ff55
--- /dev/null
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/sl20/SL20HttpBindingUtils.java
@@ -0,0 +1,47 @@
+package at.gv.egiz.pdfas.web.sl20;
+
+import java.io.IOException;
+import java.io.StringWriter;
+import java.net.URISyntaxException;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.http.client.utils.URIBuilder;
+import org.apache.http.entity.ContentType;
+import org.jose4j.base64url.Base64Url;
+import org.slf4j.LoggerFactory;
+
+import com.google.gson.JsonObject;
+
+import at.gv.egiz.sl20.utils.SL20Constants;
+
+public class SL20HttpBindingUtils {
+	private static final org.slf4j.Logger log = LoggerFactory.getLogger(SL20HttpBindingUtils.class);
+	
+	public static void writeIntoResponse(HttpServletRequest request, HttpServletResponse response, JsonObject sl20Forward, String redirectURL) throws IOException, URISyntaxException {
+		//forward SL2.0 command
+		if (request.getHeader(SL20Constants.HTTP_HEADER_SL20_CLIENT_TYPE) != null && 
+				request.getHeader(SL20Constants.HTTP_HEADER_SL20_CLIENT_TYPE).equals(SL20Constants.HTTP_HEADER_VALUE_NATIVE)) {
+			log.debug("Client request containts 'native client' header ... ");												
+			StringWriter writer = new StringWriter();
+			writer.write(sl20Forward.toString());						
+			final byte[] content = writer.toString().getBytes("UTF-8");
+			response.setStatus(HttpServletResponse.SC_OK);
+			response.setContentLength(content.length);
+			response.setContentType(ContentType.APPLICATION_JSON.toString());						
+			response.getOutputStream().write(content);
+											
+		} else {
+			log.debug("Client request containts is no native client ... ");
+			URIBuilder clientRedirectURI = new URIBuilder(redirectURL);
+			clientRedirectURI.addParameter(
+					SL20Constants.PARAM_SL20_REQ_COMMAND_PARAM, 
+					Base64Url.encode(sl20Forward.toString().getBytes()));
+			response.setStatus(307);
+			response.setHeader("Location", clientRedirectURI.build().toString());
+			
+		}
+		
+	}
+}
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/sl20/X509Utils.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/sl20/X509Utils.java
new file mode 100644
index 00000000..391b8271
--- /dev/null
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/sl20/X509Utils.java
@@ -0,0 +1,62 @@
+package at.gv.egiz.pdfas.web.sl20;
+
+import java.security.cert.X509Certificate;
+import java.util.List;
+
+import javax.security.auth.x500.X500Principal;
+
+public class X509Utils {
+
+	  /**
+	   * Sorts the Certificate Chain by IssuerDN and SubjectDN. The [0]-Element should be the Hostname,
+	   * the last Element should be the Root Certificate.
+	   * 
+	   * @param certs
+	   *          The first element must be the correct one.
+	   * @return sorted Certificate Chain
+	   */
+	  public static List<X509Certificate> sortCertificates(
+		      List<X509Certificate> certs)
+		  {
+		    int length = certs.size();
+		    if (certs.size() <= 1)
+		    {
+		      return certs;
+		    }
+
+		    for (X509Certificate cert : certs)
+		    {
+		      if (cert == null)
+		      {
+		        throw new NullPointerException();
+		      }
+		    }
+
+		    for (int i = 0; i < length; i++)
+		    {
+		      boolean found = false;
+		      X500Principal issuer = certs.get(i).getIssuerX500Principal();
+		      for (int j = i + 1; j < length; j++)
+		      {
+		        X500Principal subject = certs.get(j).getSubjectX500Principal();
+		        if (issuer.equals(subject))
+		        {
+		          // sorting necessary?
+		          if (i + 1 != j)
+		          {
+		            X509Certificate tmp = certs.get(i + 1);
+		            certs.set(i + 1, certs.get(j));
+		            certs.set(j, tmp);
+		          }
+		          found = true;
+		        }
+		      }
+		      if (!found)
+		      {
+		        break;
+		      }
+		    }
+
+		    return certs;
+		}
+}
diff --git a/pdf-as-web/src/main/webapp/WEB-INF/web.xml b/pdf-as-web/src/main/webapp/WEB-INF/web.xml
index a7bb5f74..9b69c983 100644
--- a/pdf-as-web/src/main/webapp/WEB-INF/web.xml
+++ b/pdf-as-web/src/main/webapp/WEB-INF/web.xml
@@ -85,6 +85,12 @@
 		<description></description>
 		<servlet-class>at.gv.egiz.pdfas.web.servlets.DataURLServlet</servlet-class>
 	</servlet>
+ 	<servlet>
+		<servlet-name>SLDataURLServlet</servlet-name>
+		<display-name>SLDataURLServlet</display-name>
+		<description></description>
+		<servlet-class>at.gv.egiz.pdfas.web.servlets.SLDataURLServlet</servlet-class>
+	</servlet>
 	<servlet>
 		<servlet-name>VisBlockServlet</servlet-name>
 		<display-name>VisBlockServlet</display-name>
@@ -185,6 +191,10 @@
 		<url-pattern>/DataURL</url-pattern>
 	</servlet-mapping>
 	<servlet-mapping>
+		<servlet-name>SLDataURLServlet</servlet-name>
+		<url-pattern>/DataURLSL20</url-pattern>
+	</servlet-mapping>
+	<servlet-mapping>
 		<servlet-name>VerifyServlet</servlet-name>
 		<url-pattern>/Verify</url-pattern>
 	</servlet-mapping>
diff --git a/pdf-as-web/src/main/webapp/index.jsp b/pdf-as-web/src/main/webapp/index.jsp
index de41028b..c07b2cc0 100644
--- a/pdf-as-web/src/main/webapp/index.jsp
+++ b/pdf-as-web/src/main/webapp/index.jsp
@@ -37,6 +37,17 @@
 		<%
 			}
 		%>
+		
+		<%
+			if (WebConfiguration.getSecurityLayer20URL() != null) {
+		%>
+		<button type="submit" value="sl20" name="connector" id="sl20backend">SL2.0 Interface</button>
+		<label for="placeholder_web_id">Placeholder ID</label>
+          <input type="text" id="placeholder_web_id" name="placeholder_web_id">
+		<%
+			}
+		%>
+		
 		<%
 			if (WebConfiguration.getKeystoreDefaultEnabled()) {
 		%>