Support to sign a document with a specified signature

Reviewed-on: https://gerrit.libreoffice.org/61778
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
(cherry picked from commit 40810c43)

Conflicts:
	xmlsecurity/source/component/documentdigitalsignatures.cxx

Change-Id: I92e392b315c9217b63db830dea1b2e91387b56c2

helpcontent2 @ 0233c4eb

-Subproject commit 4fcc8606724bcf6ec87b3ca741d4a00633e1b3c4
+Subproject commit 0233c4ebfd07878cd77454d1970fdf002c4e67b6

offapi/com/sun/star/security/XDocumentDigitalSignatures.idl

@@ -157,7 +157,15 @@ interface XDocumentDigitalSignatures : com::sun::star::uno::XInterface
      */
     com::sun::star::security::XCertificate chooseCertificateWithProps( [out] sequence<::com::sun::star::beans::PropertyValue> Properties);
 
-} ;
+    /** Signs the content of the document with the provided certificate.
+
+        @since LibreOffice 6.2
+     */
+    boolean signDocumentWithCertificate([in] ::com::sun::star::security::XCertificate xCertificate,
+                                        [in] ::com::sun::star::embed::XStorage xStorage,
+                                        [in] ::com::sun::star::io::XStream xStream);
+
+};
 
 } ; } ; } ; } ;
 

xmlsecurity/source/component/documentdigitalsignatures.cxx

@@ -47,9 +47,11 @@
 #include <comphelper/sequence.hxx>
 #include <cppuhelper/supportsservice.hxx>
 #include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/xml/crypto/XXMLSecurityContext.hpp>
 
 using namespace css;
 using namespace css::uno;
+using namespace css::xml::crypto;
 
 DocumentDigitalSignatures::DocumentDigitalSignatures( const Reference< XComponentContext >& rxCtx ):
     mxCtx(rxCtx),
@@ -578,4 +580,40 @@ Reference< XInterface > DocumentDigitalSignatures_CreateInstance(
     return static_cast<cppu::OWeakObject*>(new DocumentDigitalSignatures( rCtx ));
 }
 
+sal_Bool DocumentDigitalSignatures::signDocumentWithCertificate(
+            css::uno::Reference<css::security::XCertificate> const & xCertificate,
+            css::uno::Reference<css::embed::XStorage> const & xStorage,
+            css::uno::Reference<css::io::XStream> const & xStream)
+{
+    DocumentSignatureManager aSignatureManager(mxCtx, DocumentSignatureMode::Content);
+
+    if (!aSignatureManager.init())
+        return false;
+
+    aSignatureManager.mxStore = xStorage;
+    aSignatureManager.maSignatureHelper.SetStorage(xStorage, m_sODFVersion);
+    aSignatureManager.mxSignatureStream = xStream;
+
+    Reference<XXMLSecurityContext> xSecurityContext;
+    Reference<XServiceInfo> xServiceInfo(xCertificate, UNO_QUERY);
+    xSecurityContext = aSignatureManager.getSecurityContext();
+
+    sal_Int32 nSecurityId;
+
+    bool bSuccess = aSignatureManager.add(xCertificate, xSecurityContext, "", nSecurityId, true);
+    if (!bSuccess)
+        return false;
+
+    aSignatureManager.read(/*bUseTempStream=*/true, /*bCacheLastSignature=*/false);
+    aSignatureManager.write(true);
+
+    if (xStorage.is() && !xStream.is())
+    {
+        uno::Reference<embed::XTransactedObject> xTransaction(xStorage, uno::UNO_QUERY);
+        xTransaction->commit();
+    }
+
+    return true;
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

xmlsecurity/source/component/documentdigitalsignatures.hxx

@@ -108,6 +108,11 @@ public:
     css::uno::Reference< css::security::XCertificate > SAL_CALL chooseSigningCertificate(OUString& rDescription) override;
     css::uno::Sequence<css::uno::Reference< css::security::XCertificate > > SAL_CALL chooseEncryptionCertificate() override;
     css::uno::Reference< css::security::XCertificate > SAL_CALL chooseCertificateWithProps(css::uno::Sequence<::com::sun::star::beans::PropertyValue>& Properties) override;
+
+    sal_Bool SAL_CALL signDocumentWithCertificate(
+                            css::uno::Reference<css::security::XCertificate> const & xCertificate,
+                            css::uno::Reference<css::embed::XStorage> const & xStoragexStorage,
+                            css::uno::Reference<css::io::XStream> const & xStream) override;
 };
 
 /// @throws css::uno::Exception