Get the Certificate Used for Decryption

See more MIME Examples

Loads a CMS/PKCS #7 encrypted S/MIME message and decrypts it back to the original MIME content.

After a successful decryption, LastDecryptCert loads the certificate(s) actually used into a Cert object, indexed from zero up to NumDecryptCerts minus one.

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>

void ChilkatSample(void)
    {
    bool success = false;

    CkMimeW mime;
    success = mime.LoadMimeFile(L"qa_data/encrypted.eml");
    if (success == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    //  Configure a decryption source and decrypt.
    const wchar_t *pfxPassword = L"myPfxPassword";
    success = mime.AddPfxSourceFile(L"qa_data/recipient.pfx",pfxPassword);
    if (success == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    success = mime.Decrypt();
    if (success == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    //  After a successful decryption, load the certificate(s) that were used.  The 1st argument is the
    //  zero-based index and the 2nd is a Cert that receives the certificate.
    int n = mime.get_NumDecryptCerts();
    CkCertW cert;
    int i;
    for (i = 0; i <= n - 1; i++) {
        success = mime.LastDecryptCert(i,cert);
        if (success == false) {
            wprintf(L"%s\n",mime.lastErrorText());
            return;
        }

        wprintf(L"Decrypted with: %s\n",cert.subjectCN());
    }
    }