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diff --git a/smccSTAL/src/main/java/at/gv/egiz/bku/smccstal/SecureViewer.java b/smccSTAL/src/main/java/at/gv/egiz/bku/smccstal/SecureViewer.java
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+++ b/smccSTAL/src/main/java/at/gv/egiz/bku/smccstal/SecureViewer.java
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+/*
+ * Copyright 2008 Federal Chancellery Austria and
+ * Graz University of Technology
+ *
+ * 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 at.gv.egiz.bku.smccstal;
+
+import at.gv.egiz.stal.signedinfo.ReferenceType;
+import java.security.DigestException;
+import java.util.List;
+
+/**
+ *
+ * @author Clemens Orthacker <clemens.orthacker@iaik.tugraz.at>
+ */
+public interface SecureViewer {
+
+ /**
+ * Displays the hashdata inputs for all provided dsig:SignedReferences.
+ * Implementations may verify the digest value if necessary.
+ * (LocalSignRequestHandler operates on DataObjectHashDataInput,
+ * other SignRequestHandlers should cache the HashDataInputs obtained by webservice calls,
+ * or simply forward to a HashDataInputServlet.)
+ * @param signedReferences The caller may select a subset of the references in SignedInfo to be displayed.
+ * @throws java.security.DigestException if digest values are verified and do not correspond
+ * (or any other digest computation error occurs)
+ * @throws java.lang.Exception
+ */
+ void displayDataToBeSigned(List<ReferenceType> signedReferences)
+ throws DigestException, Exception;
+
+}