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(C#) Add EncapsulatedTimestamp to Already-Signed XMLSee more XML Digital Signatures ExamplesDemonstrates how to add an EncapsulatedTimestamp to an existing XML signature. Note: This example requires Chilkat v9.5.0.90 or greater.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Note: We cannot load the already-signed XML into a Chilkat XML object because it would re-format the XML when re-emitted. // (i.e. indentation and whitespace could change, and it would invalidate the existing signature.) // We must use a StringBuilder. Chilkat.StringBuilder sbXml = new Chilkat.StringBuilder(); bool success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/encapsulatedTimestamp_not_yet_added.xml","utf-8"); if (success == false) { Debug.WriteLine("Failed to load the XML file."); return; } Chilkat.XmlDSig dsig = new Chilkat.XmlDSig(); success = dsig.LoadSignatureSb(sbXml); if (success == false) { Debug.WriteLine(dsig.LastErrorText); return; } if (dsig.HasEncapsulatedTimeStamp() == true) { Debug.WriteLine("This signed XML already has an EncapsulatedTimeStamp"); return; } // Specify the timestamping authority URL Chilkat.JsonObject json = new Chilkat.JsonObject(); json.UpdateString("timestampToken.tsaUrl","http://timestamp.digicert.com"); json.UpdateBool("timestampToken.requestTsaCert",true); // Call AddEncapsulatedTimeStamp to add the EncapsulatedTimeStamp to the signature. // Note: If the signed XML contains multiple signatures, the signature modified is the one // indicated by the dsig.Selector property. Chilkat.StringBuilder sbOut = new Chilkat.StringBuilder(); success = dsig.AddEncapsulatedTimeStamp(json,sbOut); if (success == false) { Debug.WriteLine(dsig.LastErrorText); return; } sbOut.WriteFile("qa_output/addedEncapsulatedTimeStamp.xml","utf-8",false); // The EncapsulatedTimeStamp can be validated when validating the signature by adding the VerifyEncapsulatedTimeStamp // keyword to UncommonOptions. See here: // ---------------------------------------- // Verify the signatures we just produced... Chilkat.XmlDSig verifier = new Chilkat.XmlDSig(); success = verifier.LoadSignatureSb(sbOut); if (success != true) { Debug.WriteLine(verifier.LastErrorText); return; } // Add "VerifyEncapsulatedTimeStamp" to the UncommonOptions to also verify any EncapsulatedTimeStamps verifier.UncommonOptions = "VerifyEncapsulatedTimeStamp"; int numSigs = verifier.NumSignatures; int verifyIdx = 0; while (verifyIdx < numSigs) { verifier.Selector = verifyIdx; bool verified = verifier.VerifySignature(true); if (verified != true) { Debug.WriteLine(verifier.LastErrorText); return; } verifyIdx = verifyIdx + 1; } Debug.WriteLine("All signatures were successfully verified."); |
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