workaround for https://bugzilla.redhat.com/show_bug.cgi?id=1155012

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1636769 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 28 insertions, 0 deletions

diff --git a/src/ooxml/java/org/apache/poi/poifs/crypt/dsig/facets/SignatureFacet.java b/src/ooxml/java/org/apache/poi/poifs/crypt/dsig/facets/SignatureFacet.java
index 40c29aabae..c21a4c8525 100644
--- a/src/ooxml/java/org/apache/poi/poifs/crypt/dsig/facets/SignatureFacet.java
+++ b/src/ooxml/java/org/apache/poi/poifs/crypt/dsig/facets/SignatureFacet.java
@@ -24,7 +24,12 @@
 

 package org.apache.poi.poifs.crypt.dsig.facets;

 

+import java.lang.reflect.Field;

+import java.lang.reflect.Method;

 import java.security.GeneralSecurityException;

+import java.security.MessageDigest;

+import java.security.Provider;

+import java.security.Security;

 import java.util.List;

 

 import javax.xml.XMLConstants;

@@ -38,9 +43,13 @@ import javax.xml.crypto.dsig.XMLSignatureException;
 import javax.xml.crypto.dsig.XMLSignatureFactory;

 import javax.xml.crypto.dsig.spec.TransformParameterSpec;

 

+import org.apache.jcp.xml.dsig.internal.dom.DOMDigestMethod;

+import org.apache.jcp.xml.dsig.internal.dom.DOMReference;

 import org.apache.poi.openxml4j.opc.PackageNamespaces;

 import org.apache.poi.poifs.crypt.dsig.SignatureConfig;

 import org.apache.poi.poifs.crypt.dsig.SignatureConfig.SignatureConfigurable;

+import org.apache.poi.util.POILogFactory;

+import org.apache.poi.util.POILogger;

 import org.w3c.dom.Document;

 

 /**

@@ -48,6 +57,8 @@ import org.w3c.dom.Document;
  */

 public abstract class SignatureFacet implements SignatureConfigurable {

 

+    private static final POILogger LOG = POILogFactory.getLogger(SignatureFacet.class);

+    

     public static final String XML_NS = XMLConstants.XMLNS_ATTRIBUTE_NS_URI;

     public static final String XML_DIGSIG_NS = XMLSignature.XMLNS;

     public static final String OO_DIGSIG_NS = PackageNamespaces.DIGITAL_SIGNATURE;

@@ -138,6 +149,23 @@ public abstract class SignatureFacet implements SignatureConfigurable {
         } else {

             reference = sigFac.newReference(uri, digestMethod, transforms, type, id, digestValue);

         }

+        

+        // workaround for https://bugzilla.redhat.com/show_bug.cgi?id=1155012

+        // overwrite standard message digest, if a digest <> SHA1 is used

+        Provider bcProv = Security.getProvider("BC");

+        if (bcProv != null && !DigestMethod.SHA1.equals(digestMethodUri)) {

+            try {

+                Method m = DOMDigestMethod.class.getDeclaredMethod("getMessageDigestAlgorithm");

+                m.setAccessible(true);

+                String mdAlgo = (String)m.invoke(digestMethod);

+                MessageDigest md = MessageDigest.getInstance(mdAlgo, bcProv);

+                Field f = DOMReference.class.getDeclaredField("md");

+                f.setAccessible(true);

+                f.set(reference, md);

+            } catch (Exception e) {

+                LOG.log(POILogger.WARN, "Can't overwrite message digest (workaround for https://bugzilla.redhat.com/show_bug.cgi?id=1155012)", e);

+            }

+        }

 

         return reference;

     }