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(C#) Verify an XML Signature with Multiple ReferencesDemonstrates how to verify an XML digital signature that contains multiple references.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // An example of an enveloping XML signature with mulitple references is available at // https://www.chilkatsoft.com/exampleData/envelopedMultipleRefs.xml // This example will show how to verify the signature and all references, and also how // to verify each reference individually. This is useful to distinguish which part // of the XML signature validation failed. It could be that one or more of the references // failed because of a hash computation mismatch. Or it could be that the signature over // the SignedInfo failed. // First, let's grab the sample XML signature. Chilkat.Http http = new Chilkat.Http(); Chilkat.StringBuilder sbXml = new Chilkat.StringBuilder(); bool success = http.QuickGetSb("https://www.chilkatsoft.com/exampleData/envelopedMultipleRefs.xml",sbXml); if (success != true) { Debug.WriteLine(http.LastErrorText); return; } // Load the XML containing the signature to be verified. Chilkat.XmlDSig verifier = new Chilkat.XmlDSig(); success = verifier.LoadSignatureSb(sbXml); if (success != true) { Debug.WriteLine(verifier.LastErrorText); return; } bool verifyReferenceDigests = true; // The quick way to validate all references and the signature over the SignedInfo // is to call VerifySignature with verifyReferenceDigests equal to true. bool verified = verifier.VerifySignature(verifyReferenceDigests); Debug.WriteLine("Signature and all reference digests verified = " + Convert.ToString(verified)); // Let's pretend the call to VerifySignature returned false. Something did not validate. // Was it one or more of the References that did not hash to the correct value? // Or was it the signature over the SignedInfo that failed? // We can check just the signature over the SignedInfo by passing false to VerifySignature. // This allows us to skip the hashing and checking each Reference. verifyReferenceDigests = false; bool signedInfoVerified = verifier.VerifySignature(verifyReferenceDigests); Debug.WriteLine("Neglecting the reference hashes, the SignedInfo validation result = " + Convert.ToString(signedInfoVerified)); // We can also verify each reference digest separately int numRefs = verifier.NumReferences; int i = 0; while (i < numRefs) { bool refDigestVerified = verifier.VerifyReferenceDigest(i); Debug.WriteLine("Reference " + Convert.ToString(i) + " digest verified = " + Convert.ToString(refDigestVerified)); i = i + 1; } // For this sample XML signature with 3 References, we get the following output: // Signature and all reference digests verified = True // Neglecting the reference hashes, the SignedInfo validation result = True // Reference 0 digest verified = True // Reference 1 digest verified = True // Reference 2 digest verified = Tru |
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