Create an Opaque Signature with a Separate Private Key

See more MIME Examples

Demonstrates the Chilkat Mime.ConvertToSignedPk method, which creates an opaque signature using a signer certificate and its separately supplied private key. The first argument is the Cert and the second is the PrivateKey.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

#include <CkMimeW.h>
#include <CkCertW.h>
#include <CkPrivateKeyW.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkMimeW mime;
    success = mime.SetBodyFromPlainText(L"This message will be signed.");
    if (success == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    //  Load the certificate and its private key separately.
    CkCertW cert;
    success = cert.LoadFromFile(L"qa_data/signer.cer");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    CkPrivateKeyW privKey;
    success = privKey.LoadPemFile(L"qa_data/signer_privkey.pem");
    if (success == false) {
        wprintf(L"%s\n",privKey.lastErrorText());
        return;
    }

    //  Create an opaque signature when the certificate and private key are supplied separately.  The
    //  1st argument is the signer certificate and the 2nd is its private key.
    success = mime.ConvertToSignedPk(cert,privKey);
    if (success == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    success = mime.SaveMime(L"qa_output/signed_opaque.eml");
    if (success == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    wprintf(L"Message converted to an opaque signed message.\n");
    }