Sign a File to Create a .p7s File (Detached Signature)

C++ example to create a detached signature file (.p7s) for any type file. The signature can be verified by calling VerifyP7S and passing the original filename and the .p7s filename.

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#include <CkCrypt2.h>
#include <CkCreateCS.h>
#include <CkCertStore.h>
#include <CkCert.h>

void ChilkatSample(void)
    {
    CkCrypt2 crypt;

    //  Any string argument automatically begins the 30-day trial.
    bool success;
    success = crypt.UnlockComponent("30-day trial");
    if (success != true) {
        printf("Crypt component unlock failed\n");
        return;
    }

    //  Find our digital certificate from the Current User certificate store.
    CkCreateCS ccs;
    CkCertStore *certStore = 0;
    certStore = ccs.OpenCurrentUserStore();
    CkCert *cert = 0;
    cert = certStore->FindCertBySubjectCN("Chilkat Software, Inc.");
    if (cert == 0 ) {
        printf("%s\n",cert->lastErrorText());
        delete certStore;
        return;
    }

    //  Tell the crypt component to use this cert.
    crypt.SetSigningCert(*cert);

    delete certStore;

    //  We can sign any type of file, creating a .p7s as output:
    success = crypt.CreateP7S("license.rtf","license.p7s");
    if (success == false) {
        printf("%s\n",crypt.lastErrorText());
        delete cert;
        return;
    }

    //  Verify the signature:
    crypt.SetVerifyCert(*cert);

    success = crypt.VerifyP7S("license.rtf","license.p7s");
    if (success == false) {
        printf("%s\n",crypt.lastErrorText());
        delete cert;
        return;
    }

    delete cert;

    printf("Success!\n");
    }