(C) Verify XML Digital Signature

Verifies XML signatures in an XML file.

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#include <C_CkStringBuilder.h>
#include <C_CkXmlDSig.h>

void ChilkatSample(void)
    {
    HCkStringBuilder sbXml;
    BOOL success;
    HCkXmlDSig dsig;
    int i;
    BOOL bVerifyReferenceDigests;
    BOOL bVerified;

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

    sbXml = CkStringBuilder_Create();
    success = CkStringBuilder_LoadFile(sbXml,"qa_data/xml_dsig_verify/csioz_sample.xml","utf-8");
    if (success != TRUE) {
        printf("Failed to load XML file.\n");
        CkStringBuilder_Dispose(sbXml);
        return;
    }

    dsig = CkXmlDSig_Create();

    // First load the XML containing the signatures to be verified.
    success = CkXmlDSig_LoadSignatureSb(dsig,sbXml);
    if (success != TRUE) {
        printf("%s\n",CkXmlDSig_lastErrorText(dsig));
        CkStringBuilder_Dispose(sbXml);
        CkXmlDSig_Dispose(dsig);
        return;
    }

    // It's possible that an XML document can contain multiple signatures.
    // Each can be verified as follows:
    i = 0;
    while (i < CkXmlDSig_getNumSignatures(dsig)) {
        // Select the Nth signature by setting the Selector property.
        CkXmlDSig_putSelector(dsig,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.
        bVerifyReferenceDigests = TRUE;
        bVerified = CkXmlDSig_VerifySignature(dsig,bVerifyReferenceDigests);
        printf("Signature %d verified = %d\n",i + 1,bVerified);

        i = i + 1;
    }



    CkStringBuilder_Dispose(sbXml);
    CkXmlDSig_Dispose(dsig);

    }