(C++) Verify XML Digital Signature

Verifies XML signatures in an XML file.

Chilkat C/C++ Library Downloads
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#include <CkStringBuilder.h>
#include <CkXmlDSig.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkStringBuilder sbXml;
    bool success = sbXml.LoadFile("qa_data/xml_dsig_verify/csioz_sample.xml","utf-8");
    if (success != true) {
        std::cout << "Failed to load XML file." << "\r\n";
        return;
    }

    CkXmlDSig dsig;

    // First load the XML containing the signatures to be verified.
    success = dsig.LoadSignatureSb(sbXml);
    if (success != true) {
        std::cout << dsig.lastErrorText() << "\r\n";
        return;
    }

    // It's possible that an XML document can contain multiple signatures.
    // Each can be verified as follows:
    int i = 0;
    while (i < dsig.get_NumSignatures()) {
        // Select the Nth signature by setting the Selector property.
        dsig.put_Selector(i);

        // The bVerifyReferenceDigests argument determines if we want
        // to also verify each reference digest.  If set to false,
        // then only the SignedInfo part of the Signature is verified.
        bool bVerifyReferenceDigests = true;
        bool bVerified = dsig.VerifySignature(bVerifyReferenceDigests);
        std::cout << "Signature " << (i + 1) << " verified = " << bVerified << "\r\n";

        i = i + 1;
    }
    }