(C) Get PDF Signer Certs

See more PDF Signatures Examples

This example demonstrates how to validate the signatures in a PDF and also shows how to get each signature's signer certificate.

Note: This example requires Chilkat v9.5.0.87 or greater.

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#include <C_CkPdf.h>
#include <C_CkJsonObject.h>
#include <C_CkCert.h>

void ChilkatSample(void)
    {
    HCkPdf pdf;
    BOOL success;
    HCkJsonObject sigInfo;
    int numSignatures;
    BOOL validated;
    HCkCert cert;
    int i;

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

    pdf = CkPdf_Create();

    // Load a PDF that has cryptographic signatures to be validated
    success = CkPdf_LoadFile(pdf,"qa_data/pdf/sign_testing_1/helloSigned2.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        return;
    }

    // Each time we verify a signature, information about the signature is written into
    // sigInfo (replacing whatever sigInfo previously contained).
    sigInfo = CkJsonObject_Create();

    // Iterate over each signature and validate each.
    numSignatures = CkPdf_getNumSignatures(pdf);
    validated = FALSE;
    cert = CkCert_Create();
    i = 0;
    while (i < numSignatures) {
        validated = CkPdf_VerifySignature(pdf,i,sigInfo);
        printf("Signature %d validated: %d\n",i,validated);

        // The GetSignerCert method was added in Chilkat v9.5.0.87
        // After calling VerifySignature, you can get the signer certificate by calling
        // GetSignerCert with the same index. 
        success = CkPdf_GetSignerCert(pdf,i,cert);
        if (success != FALSE) {
            printf("PDF signer certificate: %s\n",CkCert_subjectDN(cert));
        }

        i = i + 1;
    }

    printf("Finished.\n");


    CkPdf_Dispose(pdf);
    CkJsonObject_Dispose(sigInfo);
    CkCert_Dispose(cert);

    }